Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
Comlinear® CLC1605, CLC2605, CLC3605
1.5GHz Ampliers
Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 - Fax. +1 510 668-7001
FEATURES
n 0.1dB gain atness to 120MHz
n 0.01%/0.01˚ differential gain/phase
n 1.2GHz -3dB bandwidth at G = 2
n 700MHz large signal bandwidth
n 2,500V/μs slew rate
n 3.7nV/√Hz input voltage noise
n 120mA output current
n Triple offers disable
n Fully specied at 5V and ±5V supplies
n CLC1605: Pb-free SOT23-5
n CLC2605: Pb-free SOIC-8
n CLC3605: Pb-free SOIC-16
APPLICATIONS
n RGB video line drivers
n High denition video driver
n Video switchers and routers
n ADC buffer
n Active lters
n High-speed instrumentation
n Wide dynamic range IF amp
n Radar/communication receivers
General Description
The COMLINEAR CLC1605 (single), CLC2605 (dual), and CLC3605 (triple)
are high-performance, current feedback ampliers that provide 1.5GHz unity
gain bandwidth, ±0.1dB gain atness to 120MHz, and 2,500V/μs slew rate.
This high performance exceeds the requirements of high-denition television
(HDTV) and other multimedia applications. These COMLINEAR high-
performance ampliers also provide ample output current to drive multiple
video loads.
The COMLINEAR CLC1605, CLC2605, and CLC3605 are designed to operate
from ±5V or +5V supplies. The CLC3605 offers a fast enable/disable feature
to save power. While disabled, the outputs are in a high-impedance state
to allow for multiplexing applications. The combination of high-speed, low-
power, and excellent video performance make these ampliers well suited
for use in many general purpose, high-speed applications including high-
denition video, imaging applications, and radar/communications receivers.
Typical Application - Driving Dual Video Loads
Ordering Information
Part Number Package Pb-Free RoHS Compliant Operating Temperature Range Packaging Method
CLC1605IST5X SOT23-5 Yes Yes -40°C to +85°C Reel
CLC2605ISO8X* SOIC-8 Yes Yes -40°C to +85°C Reel
CLC3605ISO16X SOIC-16 Yes Yes -40°C to +85°C Reel
Moisture sensitivity level for all parts is MSL-1. *Preliminary.
Input
Output A
+Vs
-Vs
Rg
Rf
75Ω
75Ω
Cable 75Ω
Cable
75Ω
Cable
75Ω
75Ω
75Ω
75Ω
Output B
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 2/21 Rev 1E
CLC1605 Pin Assignments
Pin No. Pin Name Description
1OUT Output
2-VSNegative supply
3 +IN Positive input
4-IN Negative input
5 +VSPositive supply
CLC2605 Pin Assignments
Pin No. Pin Name Description
1OUT1 Output, channel 1
2 -IN1 Negative input, channel 1
3 +IN1 Positive input, channel 1
4-VSNegative supply
5 +IN2 Positive input, channel 2
6-IN2 Negative input, channel 2
7OUT2 Output, channel 2
8 +VSPositive supply
CLC3605 Pin Conguration
Pin No. Pin Name Description
1-IN1 Negative input, channel 1
2+IN1 Positive input, channel 1
3-VSNegative supply
4 -IN2 Negative input, channel 2
5 +IN2 Positive input, channel 2
6-VSNegative supply
7+IN3 Positive input, channel 3
8 -IN3 Negative input, channel 3
9DIS3 Disable pin. Enabled if pin is grounded, left oating or
pulled below VON, disabled if pin is pulled above VOFF.
10 OUT3 Output, channel 3
11 +VSPositive supply
12 OUT2 Output, channel 2
13 DIS2 Disable pin. Enabled if pin is grounded, left oating or
pulled below VON, disabled if pin is pulled above VOFF.
14 +VSPositive supply
15 OUT1 Output, channel 1
16 DIS1 Disable pin. Enabled if pin is grounded, left oating or
pulled below VON, disabled if pin is pulled above VOFF.
Disable Pin Truth Table
Pin High Low*
DIS Disabled Enabled
*Default Open State
CLC1605 Pin Conguration
CLC3605 Pin Conguration
2
3
5
4
+IN
+VS
-IN
1
-VS
OUT
-
+
2
3
4 13
14
15
16
OUT1
-VS
DIS1
+VS
1
+IN1
-IN1
5
6
7
+IN3
-VS
+IN2
10
11
12
OUT2
+VS
OUT3
-IN2 DIS2
8
-IN3
9
DIS3
CLC2605 Pin Conguration
-
+
-
+
1
2
3
4
OUT1
-IN1
+IN1
-Vs
+Vs
OUT2
-IN2
+IN2
8
7
6
5
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 3/21 Rev 1E
Absolute Maximum Ratings
The safety of the device is not guaranteed when it is operated above the “Absolute Maximum Ratings”. The device
should not be operated at these “absolute” limits. Adhere to the “Recommended Operating Conditions” for proper de-
vice function. The information contained in the Electrical Characteristics tables and Typical Performance plots reect the
operating conditions noted on the tables and plots.
Parameter Min Max Unit
Supply Voltage 014 V
Input Voltage Range -Vs -0.5V +Vs +0.5V V
Continuous Output Current 120 mA
Reliability Information
Parameter Min Typ Max Unit
Junction Temperature 150 °C
Storage Temperature Range -65 150 °C
Lead Temperature (Soldering, 10s) 260 °C
Package Thermal Resistance
5-Lead SOT23 221 °C/W
8-Lead SOIC 100 °C/W
16-Lead SOIC 68 °C/W
Notes:
Package thermal resistance (qJA), JDEC standard, multi-layer test boards, still air.
ESD Protection
Product SOT23-5 SOIC-16
Human Body Model (HBM) (1) 2kV 2kV
Charged Device Model (CDM) 1kV 1kV
Notes:
1. 0.8kV between the input pairs +IN and -IN pins only. All other pins are 2kV.
Recommended Operating Conditions
Parameter Min Typ Max Unit
Operating Temperature Range -40 +85 °C
Supply Voltage Range 4.5 12 V
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 4/21 Rev 1E
Electrical Characteristics at +5V
TA = 25°C, Vs = +5V, Rf = Rg =330Ω, RL = 150Ω to VS/2, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBW Unity Gain Bandwidth G = +1, VOUT = 0.5Vpp, Rf = 499Ω 1250 MHz
BWSS -3dB Bandwidth G = +2, VOUT = 0.5Vpp 1000 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 1Vpp 825 MHz
BW0.1dBSS 0.1dB Gain Flatness G = +2, VOUT = 0.5Vpp 100 MHz
BW0.1dBLS 0.1dB Gain Flatness G = +2, VOUT = 1Vpp 100 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 1V step; (10% to 90%) 0.6 ns
tSSettling Time to 0.1% VOUT = 1V step 10 ns
OS Overshoot VOUT = 0.2V step 1 %
SR Slew Rate 2V step 1350 V/µs
Distortion/Noise Response
HD2 2nd Harmonic Distortion VOUT = 1Vpp, 5MHz -75 dBc
HD3 3rd Harmonic Distortion VOUT = 1Vpp, 5MHz -85 dBc
THD Total Harmonic Distortion VOUT = 1Vpp, 5MHz 74 dB
DGDifferential Gain NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.04 %
DPDifferential Phase NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 °
IP3 Third Order Intercept VOUT = 1Vpp, 10MHz 37 dBm
SFDR Spurious Free Dynamic Range VOUT = 1Vpp, 5MHz 61 dBc
enInput Voltage Noise > 1MHz 3.7 nV/√Hz
inInput Current Noise > 1MHz, Inverting 20 pA/√Hz
> 1MHz, Non-Inverting 30 pA/√Hz
XTALK Crosstalk Channel-to-channel 5MHz, VOUT = 2Vpp 60 dB
DC Performance
VIO Input Offset Voltage 0mV
dVIO Average Drift 1.6 µV/°C
Ibn Input Bias Current - Non-Inverting 3 µA
dIbn Average Drift 7nA/°C
Ibi Input Bias Current - Inverting 6µA
dIbi Average Drift 20 nA/°C
PSRR Power Supply Rejection Ratio DC 58 dB
ISSupply Current per channel 11 mA
Disable Characteristics - CLC3605 only
TON Turn On Time 23 ns
TOFF Turn Off Time 350 ns
OFFIOS Off Isolation 5MHz, VOUT = 2Vpp 75 dB
VOFF Power Down Input Voltage DIS pin, disabled if pin is pulled above VOFF Disabled if DIS > 1.5V V
VON Enable Input Voltage DIS pin, enabled if pin is grounded, left open
or pulled below VON Enabled if DIS < 0.5V V
ISD Disable Supply Current DIS pin is pulled to VS 0.09 mA
Input Characteristics
RIN Input Resistance Non-inverting 150 kΩ
Inverting 70 Ω
CIN Input Capacitance 1.0 pF
CMIR Common Mode Input Range 1.5 to
3.5 V
CMRR Common Mode Rejection Ratio DC 50 dB
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 5/21 Rev 1E
Electrical Characteristics at +5V continued
TA = 25°C, Vs = +5V, Rf = Rg =330Ω, RL = 150Ω to VS/2, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Output Characteristics
ROOutput Resistance Closed Loop, DC 0.1 Ω
VOUT Output Voltage Swing RL = 150Ω 1.5 to
3.5 V
IOUT Output Current ±120 mA
Notes:
1. 100% tested at 25°C
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 6/21 Rev 1E
Electrical Characteristics at ±5V
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBW Unity Gain Bandwidth G = +1, VOUT = 0.5Vpp, Rf = 499Ω 1500 MHz
BWSS -3dB Bandwidth G = +2, VOUT = 0.5Vpp 1200 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 2Vpp 700 MHz
BW0.1dBSS 0.1dB Gain Flatness G = +2, VOUT = 0.5Vpp 120 MHz
BW0.1dBLS 0.1dB Gain Flatness G = +2, VOUT = 2Vpp 120 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 2V step; (10% to 90%) 0.65 ns
tSSettling Time to 0.1% VOUT = 2V step 13 ns
OS Overshoot VOUT = 0.2V step 1 %
SR Slew Rate 2V step 2500 V/µs
Distortion/Noise Response
HD2 2nd Harmonic Distortion VOUT = 2Vpp, 5MHz -73 dBc
HD3 3rd Harmonic Distortion VOUT = 2Vpp, 5MHz -85 dBc
THD Total Harmonic Distortion VOUT = 2Vpp, 5MHz 72 dB
DGDifferential Gain NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 %
DPDifferential Phase NTSC (3.58MHz), AC-coupled, RL = 150Ω 0.01 °
IP3 Third Order Intercept VOUT = 2Vpp, 10MHz 42 dBm
SFDR Spurious Free Dynamic Range VOUT = 1Vpp, 5MHz 73 dBc
enInput Voltage Noise > 1MHz 3.7 nV/√Hz
inInput Current Noise > 1MHz, Inverting 20 pA/√Hz
> 1MHz, Non-Inverting 30 pA/√Hz
XTALK Crosstalk Channel-to-channel 5MHz 60 dB
DC Performance
VIO Input Offset Voltage (1) -10 0 10 mV
dVIO Average Drift 1.6 µV/°C
Ibn Input Bias Current - Non-Inverting (1) -40 19 40 µA
dIbn Average Drift 7nA/°C
Ibi Input Bias Current - Inverting (1) -35 635 µA
dIbi Average Drift 20 nA/°C
PSRR Power Supply Rejection Ratio (1) DC 40 60 dB
ISSupply Current (1) per channel 12 18 mA
Disable Characteristics - CLC3605 only
TON Turn On Time 35 ns
TOFF Turn Off Time 410 ns
OFFIOS Off Isolation 5MHz, VOUT = 2Vpp 75 dB
VOFF Power Down Input Voltage DIS pin, disabled if pin is pulled above VOFF Disabled if DIS > 3V V
VON Enable Input Voltage DIS pin, enabled if pin is grounded, left open
or pulled below VON Enabled if DIS < 1V V
ISD Disable Supply Current (1) per channel, DIS pin is pulled to VS 0.1 0.3 mA
Input Characteristics
RIN Input Resistance Non-inverting 150 kΩ
Inverting 70 Ω
CIN Input Capacitance 1.0 pF
CMIR Common Mode Input Range ±4.0 V
CMRR Common Mode Rejection Ratio (1) DC 40 55 dB
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 7/21 Rev 1E
Electrical Characteristics at ±5V continued
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Output Characteristics
ROOutput Resistance Closed Loop, DC 0.1 Ω
VOUT Output Voltage Swing RL = 150Ω (1) ±3.0 ±3.8 V
IOUT Output Current ±280 mA
Notes:
1. 100% tested at 25°C
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 8/21 Rev 1E
Typical Performance Characteristics
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Frequency Response vs. VOUT Frequency Response vs. Temperature
Frequency Response vs. CLFrequency Response vs. RL
Non-Inverting Frequency Response Inverting Frequency Response
-9
-6
-3
0
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = 1
R
f
= 499Ω
G = 2
G = 5
G = 10
V
OUT
= 0.5V
pp
G = 1
R
f
= 750Ω
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = -1
G = -2
G = -5
G = -10
V
OUT
= 0.5V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
C
L
= 1000pF
R
s
= 3.3Ω
C
L
= 500pF
R
s
= 5Ω
C
L
= 100pF
R
s
= 10Ω
C
L
= 50pF
R
s
= 15Ω
C
L
= 20pF
R
s
= 20Ω
V
OUT
= 0.5V
pp
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 0.5V
pp
R
L
= 100Ω
R
L
= 50Ω
R
L
= 25Ω
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 1V
pp
V
OUT
= 2V
pp
V
OUT
= 4V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000 10000
Normalized Gain (dB)
Frequency (MHz)
+ 85degC
-40degC
+ 25degC
V
OUT
= 0.2V
pp
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 9/21 Rev 1E
Typical Performance Characteristics
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Frequency Response vs. VOUT at VS = 5V Frequency Response vs. Temperature at VS = 5V
Frequency Response vs. CL at VS = 5V Frequency Response vs. RL at VS = 5V
Non-Inverting Frequency Response at VS = 5V Inverting Frequency Response at VS = 5V
-9
-6
-3
0
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = 1
R
f
= 499Ω
G = 2
G = 5
G = 10
V
OUT
= 0.5V
pp
G = 1
R
f
= 750Ω
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
G = -1
G = -2
G = -5
G = -10
V
OUT
= 0.5V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
C
L
= 1000pF
R
s
= 3.3Ω
C
L
= 500pF
R
s
= 5Ω
C
L
= 100pF
R
s
= 10Ω
C
L
= 50pF
R
s
= 15Ω
C
L
= 20pF
R
s
= 20Ω
V
OUT
= 0.5V
pp
-6
-5
-4
-3
-2
-1
0
1
2
3
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 0.5V
pp
R
L
= 100Ω
R
L
= 50Ω
R
L
= 25Ω
-7
-6
-5
-4
-3
-2
-1
0
1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 1V
pp
V
OUT
= 2V
pp
V
OUT
= 3V
pp
-7
-6
-5
-4
-3
-2
-1
0
1
2
0.1 110 100 1000 10000
Normalized Gain (dB)
Frequency (MHz)
+ 85degC
-40degC
+ 25degC
V
OUT
= 0.2V
pp
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 10/21 Rev 1E
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Closed Loop Output Impedance vs. Frequency Input Voltage Noise
-3dB Bandwidth vs. VOUT -3dB Bandwidth vs. VOUT at VS = 5V
Gain Flatness Gain Flatness at VS = 5V
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 2V
pp
R
L
= 150Ω
R
f
= 330Ω
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.1 110 100 1000
Normalized Gain (dB)
Frequency (MHz)
V
OUT
= 2V
pp
R
L
= 150Ω
R
f
= 330Ω
200
400
600
800
1000
1200
1400
1600
1800
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
-3dB Bandwidth (MHz)
VOUT (VPP)
200
300
400
500
600
700
800
900
1000
1100
1200
0.0 0.5 1.0 1.5 2.0 2.5 3.0
-3dB Bandwidth (MHz)
VOUT (VPP)
Output Resistance (Ω)
Frequency (Hz)
10K 100K 1M 10M 100M
0.01
0.1
1
10
VS = ±5.0V
Input Voltage Noise (nV/√Hz)
Frequency (MHz)
0.0001 0.001 0.01 0.1 1 10
0
5
10
15
20
25
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 11/21 Rev 1E
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
CMRR vs. Frequency PSRR vs. Frequency
2nd Harmonic Distortion vs. VOUT 3rd Harmonic Distortion vs. VOUT
2nd Harmonic Distortion vs. RL 3rd Harmonic Distortion vs. RL
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
0510 15 20
Distortion (dBc)
Frequency (MHz)
R
L
= 150Ω
V
OUT
= 2V
pp
R
L
= 1kΩ
-100
-95
-90
-85
-80
-75
-70
-65
0510 15 20
Distortion (dBc)
Frequency (MHz)
R
L
= 150Ω
V
OUT
= 2V
pp
R
L
= 1kΩ
-100
-95
-90
-85
-80
-75
-70
-65
-60
0.5 0.75 11.25 1.5 1.75 22.25 2.5
Distortion (dBc)
10MHz
5MHz
1MHz
RL = 150Ω
-100
-95
-90
-85
-80
-75
-70
0.5 0.75 11.25 1.5 1.75 22.25 2.5
Distortion (dBc)
RL = 100Ω
10MHz
5MHz
1MHz
RL = 150Ω
CMRR (dB)
Frequency (Hz)
10k 100k 1M 10M 100M
-55
-50
-45
-40
-35
-30
-25
VS = ±5.0V
PSRR (dB)
Frequency (Hz)
10K 100K 1M 10M 100M
-60
-50
-40
-30
-20
-10
0
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 12/21 Rev 1E
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Differential Gain & Phase AC Coupled Output Differential Gain & Phase DC Coupled Output
Large Signal Pulse Response Large Signal Pulse Response at VS = 5V
Small Signal Pulse Response Small Signal Pulse Response at VS = 5V
-0.125
-0.1
-0.075
-0.05
-0.025
0
0.025
0.05
0.075
0.1
0.125
020 40 60 80 100 120 140 160 180 200
Voltage (V)
Time (ns)
2.375
2.4
2.425
2.45
2.475
2.5
2.525
2.55
2.575
2.6
2.625
020 40 60 80 100 120 140 160 180 200
Voltage (V)
Time (ns)
-2.5
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
020 40 60 80 100 120 140 160 180 200
Voltage (V)
Time (ns)
1
1.5
2
2.5
3
3.5
4
020 40 60 80 100 120 140 160 180 200
Voltage (V)
Time (ns)
-0.02
-0.015
-0.01
-0.005
0
0.005
0.01
-0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
AC coupled
DP
-0.03
-0.02
-0.01
0
0.01
0.02
0.03
-0.7 -0.5 -0.3 -0.1 0.1 0.3 0.5 0.7
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
DC coupled
DP
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 13/21 Rev 1E
Typical Performance Characteristics - Continued
TA = 25°C, Vs = ±5V, Rf = Rg =330Ω, RL = 150Ω to GND, G = 2; unless otherwise noted.
Off Isolation vs. Frequency Off Isolation vs. Frequency at VS=5V
Crosstalk vs. Frequency (CLC3605) Crosstalk vs. Frequency at VS=5V (CLC3605)
Differential Gain & Phase AC Coupled Output at VS = ±2.5V Differential Gain & Phase DC Coupled at VS = ±2.5V
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
-0.35 -0.25 -0.15 -0.05 0.05 0.15 0.25 0.35
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
AC coupled
DP
-0.07
-0.06
-0.05
-0.04
-0.03
-0.02
-0.01
0
0.01
0.02
-0.35 -0.25 -0.15 -0.05 0.05 0.15 0.25 0.35
Diff Gain (%) / Diff Phase (°)
Input Voltage (V)
DG
R
L
= 150Ω
DC coupled
DP
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
0.1 110 100
Crosstalk (dB)
Frequency (MHz)
V
OUT
= 2V
pp
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
-40
-35
-30
0.1 110 100
Crosstalk (dB)
Frequency (MHz)
V
OUT
= 1V
pp
-110
-105
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
0.1 110 100
Off Isolation (dB)
Frequency (MHz)
V
OUT
= 2V
pp
-110
-105
-100
-95
-90
-85
-80
-75
-70
-65
-60
-55
-50
-45
0.1 110 100
Off Isolation (dB)
Frequency (MHz)
V
OUT
= 1V
pp
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 14/21 Rev 1E
General Information - Current Feedback
Technology
Advantages of CFB Technology
The CLC1605 Family of ampliers utilize current feedback
(CFB) technology to achieve superior performance. The
primary advantage of CFB technology is higher slew rate
performance when compared to voltage feedback (VFB)
architecture. High slew rate contributes directly to better
large signal pulse response, full power bandwidth, and
distortion.
CFB also alleviates the traditional trade-off between
closed loop gain and usable bandwidth that is seen with
a VFB amplier. With CFB, the bandwidth is primarily
determined by the value of the feedback resistor, Rf. By
using optimum feedback resistor values, the bandwidth
of a CFB amplier remains nearly constant with different
gain congurations.
When designing with CFB ampliers always abide by these
basic rules:
• Use the recommended feedback resistor value
• Do not use reactive (capacitors, diodes, inductors, etc.)
elements in the direct feedback path
• Avoid stray or parasitic capacitance across feedback
resistors
• Follow general high-speed amplier layout guidelines
• Ensure proper precautions have been made for driving
capacitive loads
Figure 1. Non-Inverting Gain Conguration with First
Order Transfer Function
VOUT
VIN
= − Rf
Rg
+1Eq. 2
1+Rf
Zo(jω)
VIN
VOUT
Zo*Ierr
Ierr
RL
Rf
x1
Rg
Figure 2. Inverting Gain Conguration with First Order
Transfer Function
CFB Technology - Theory of Operation
Figure 1 shows a simple representation of a current
feedback amplier that is congured in the traditional
non-inverting gain conguration.
Instead of having two high-impedance inputs similar to a
VFB amplier, the inputs of a CFB amplier are connected
across a unity gain buffer. This buffer has a high impedance
input and a low impedance output. It can source or sink
current (Ierr) as needed to force the non-inverting input
to track the value of Vin. The CFB architecture employs
a high gain trans-impedance stage that senses Ierr and
drives the output to a value of (Zo(jω) * Ierr) volts. With
the application of negative feedback, the amplier will
drive the output to a voltage in a manner which tries to
drive Ierr to zero. In practice, primarily due to limitations
on the value of Zo(jω), Ierr remains a small but nite
value.
A closer look at the closed loop transfer function (Eq.1)
shows the effect of the trans-impedance, Zo(jω) on the
gain of the circuit. At low frequencies where Zo(jω) is very
large with respect to Rf, the second term of the equation
approaches unity, allowing Rf and Rg to set the gain. At
higher frequencies, the value of Zo(jω) will roll off, and
the effect of the secondary term will begin to dominate.
The -3dB small signal parameter species the frequency
where the value Zo(jω) equals the value of Rf causing the
gain to drop by 0.707 of the value at DC.
For more information regarding current feedback
ampliers, visit www.exar.com for detailed application
notes, such as AN-3:
The Ins and Outs of Current
Feedback Ampliers
.
VOUT
VIN
=1+Rf
Rg
+1Eq. 1
1+Rf
Zo(jω)
VIN VOUT
Zo*Ierr
Ierr
Rg
RL
Rf
x1
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 15/21 Rev 1E
Application Information
Basic Operation
Figures 3, 4, and 5 illustrate typical circuit congurations for
non-inverting, inverting, and unity gain topologies for dual
supply applications. They show the recommended bypass
capacitor values and overall closed loop gain equations.
Figure 3. Typical Non-Inverting Gain Circuit
Figure 4. Typical Inverting Gain Circuit
Figure 5. Typical Unity Gain (G=1) Circuit
CFB ampliers can be used in unity gain congurations.
Do not use the traditional voltage follower circuit, where
the output is tied directly to the inverting input. With a CFB
amplier, a feedback resistor of appropriate value must be
used to prevent unstable behavior. Refer to gure 5 and
Table 1. Although this seems cumbersome, it does allow a
degree of freedom to adjust the passband characteristics.
Feedback Resistor Selection
One of the key design considerations when using a CFB
amplier is the selection of the feedback resistor, Rf. Rf is
used in conjunction with Rg to set the gain in the traditional
non-inverting and inverting circuit congurations. Refer to
gures 3 and 4. As discussed in the Current Feedback
Technology section, the value of the feedback resistor has
a pronounced effect on the frequency response of the
circuit.
Table 1, provides recommended Rf and associated Rg
values for various gain settings. These values produce
the optimum frequency response, maximum bandwidth
with minimum peaking. Adjust these values to optimize
performance for a specic application. The typical
performance characteristics section includes plots that
illustrate how the bandwidth is directly affected by the
value of Rf at various gain settings.
Gain
(V/V Rf (Ω) Rg (Ω) ±0.1dB BW
(MHz)
-3dB BW
(MHz)
1499 - 167 1500
2 330 330 120 1200
5 330 82.5 66 385
10 330 33 38 245
Table 1: Recommended Rf vs. Gain
In general, lowering the value of Rf from the recommended
value will extend the bandwidth at the expense of
additional high frequency gain peaking. This will cause
increased overshoot and ringing in the pulse response
characteristics. Reducing Rf too much will eventually
cause oscillatory behavior.
Increasing the value of Rf will lower the bandwidth.
Lowering the bandwidth creates a atter frequency
response and improves 0.1dB bandwidth performance.
This is important in applications such as video. Further
increase in Rf will cause premature gain rolloff and
adversely affect gain atness.
+
-
Rf
0.1μF
6.8μF
Output
G = - (Rf/Rg)
For optimum input offset
voltage set R1 = Rf || Rg
Input
+Vs
-Vs
0.1μF
6.8μF
RL
Rg
R1
+
-
Rf
0.1μF
6.8μF
Output
G = 1
Rf is required for CFB amplifiers
Input
+Vs
-Vs
0.1μF
6.8μF
RL
+
-
Rf
0.1μF
6.8μF
Output
G = 1 + (Rf/Rg)
Input
+Vs
-Vs
Rg
0.1μF
6.8μF
RL
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 16/21 Rev 1E
Driving Capacitive Loads
Increased phase delay at the output due to capacitive
loading can cause ringing, peaking in the frequency
response, and possible unstable behavior. Use a series
resistance, RS, between the amplier and the load to
help improve stability and settling performance. Refer to
Figure 6.
Figure 6. Addition of RS for Driving
Capacitive Loads
Table 2 provides the recommended RS for various
capacitive loads. The recommended RS values result
in <=0.5dB peaking in the frequency response. The
Frequency Response vs. CL plot, on page 5, illustrates the
response of the CLC1605 Family.
CL (pF) RS (Ω) -3dB BW (MHz)
20 20 350
50 15 235
100 10 170
500 5 75
1000 3.3 52
Table 1: Recommended RS vs. CL
For a given load capacitance, adjust RS to optimize the
tradeoff between settling time and bandwidth. In general,
reducing RS will increase bandwidth at the expense of
additional overshoot and ringing.
Parasitic Capacitance on the Inverting Input
Physical connections between components create
unintentional or parasitic resistive, capacitive, and
inductive elements.
Parasitic capacitance at the inverting input can be
especially troublesome with high frequency ampliers.
A parasitic capacitance on this node will be in parallel
with the gain setting resistor Rg. At high frequencies, its
impedance can begin to raise the system gain by making
Rg appear smaller.
In general, avoid adding any additional parasitic
capacitance at this node. In addition, stray capacitance
across the Rf resistor can induce peaking and high
frequency ringing. Refer to the Layout Considerations
section for additional information regarding high speed
layout techniques.
Overdrive Recovery
An overdrive condition is dened as the point when either
one of the inputs or the output exceed their specied
voltage range. Overdrive recovery is the time needed for
the amplier to return to its normal or linear operating
point. The recovery time varies, based on whether the
input or output is overdriven and by how much the range
is exceeded. The CLC1605 Family will typically recover
in less than 10ns from an overdrive condition. Figure 7
shows the CLC1605 in an overdriven condition.
Figure 7. Overdrive Recovery
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 1000 ohm load condition. However,
applications with low impedance, DC coupled loads
should be analyzed to ensure that maximum allowed
junction temperature is not exceeded. Guidelines listed
below can be used to verify that the particular application
will not cause the device to operate beyond it’s intended
operating range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction
temperature, the package thermal resistance value
ThetaJA (ӨJA) is used along with the total die power
dissipation.
+
-
Rf
Input
Output
Rg
Rs
CLRL
-6
-4
-2
0
2
4
6
-1.5
-1
-0.5
0
0.5
1
1.5
020 40 60 80 100 120 140 160 180 200
Output Voltage (V)
Input Voltage (V)
Time (ns)
Output
Input
VIN = 2Vpp
G = 5
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 17/21 Rev 1E
TJunction = TAmbient + (ӨJA × PD)
Where TAmbient is the temperature of the working environment.
In order to determine PD, the power dissipated in the load
needs to be subtracted from the total power delivered by
the supplies.
PD = Psupply - Pload
Supply power is calculated by the standard power equation.
Psupply = Vsupply × IRMS supply
Vsupply = VS+ - VS-
Power delivered to a purely resistive load is:
Pload = ((VLOAD)RMS2)/Rloadeff
The effective load resistor (Rloadeff) will need to include
the effect of the feedback network. For instance,
Rloadeff in gure 3 would be calculated as:
RL || (Rf + Rg)
These measurements are basic and are relatively easy to
perform with standard lab equipment. For design purposes
however, prior knowledge of actual signal levels and load
impedance is needed to determine the dissipated power.
Here, PD can be found from
PD = PQuiescent + PDynamic - PLoad
Quiescent power can be derived from the specied IS
values along with known supply voltage, VSupply. Load
power can be calculated as above with the desired signal
amplitudes using:
(VLOAD)RMS = VPEAK / √2
( ILOAD)RMS = ( VLOAD)RMS / Rloadeff
The dynamic power is focused primarily within the output
stage driving the load. This value can be calculated as:
PDYNAMIC = (VS+ - VLOAD)RMS × ( ILOAD)RMS
Assuming the load is referenced in the middle of the power
rails or Vsupply/2.
Figure 8 shows the maximum safe power dissipation in
the package vs. the ambient temperature for the available
packages.
0
0.5
1
1.5
2
2.5
-40 -20 020 40 60 80
Maximum Power Dissipation (W)
Ambient Temperature (°C)
SOT23-5
SOIC-8
SOIC-16
Figure 8. Maximum Power Derating
Better thermal ratings can be achieved by maximizing
PC board metallization at the package pins. However, be
careful of stray capacitance on the input pins.
In addition, increased airow across the package can also
help to reduce the effective ӨJA of the package.
In the event the outputs are momentarily shorted to a low
impedance path, internal circuitry and output metallization
are set to limit and handle up to 65mA of output current.
However, extended duration under these conditions may
not guarantee that the maximum junction temperature
(+150°C) is not exceeded.
Layout Considerations
General layout and supply bypassing play major roles in
high frequency performance. Exar has evaluation boards
to use as a guide for high frequency layout and as aid in
device testing and characterization. Follow the steps below
as a basis for high frequency layout:
▪Include 6.8µF and 0.1µF ceramic capacitors for power
supply decoupling
▪Place the 6.8µF capacitor within 0.75 inches of the power pin
▪Place the 0.1µF capacitor within 0.1 inches of the power pin
▪Remove the ground plane under and around the part,
especially near the input and output pins to reduce
parasitic capacitance
▪Minimize all trace lengths to reduce series inductances
Refer to the evaluation board layouts below for more
information.
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 18/21 Rev 1E
Evaluation Board Information
The following evaluation boards are available to aid in the
testing and layout of these devices:
Evaluation Board # Products
CEB002 CLC1605
CEB006 CLC2605
CEB013 CLC3605
Evaluation Board Schematics
Evaluation board schematics and layouts are shown in
Figures 9-14. These evaluation boards are built for dual-
supply operation. Follow these steps to use the board in a
single-supply application:
1. Short -Vs to ground.
2. Use C3 and C4, if the -VS pin of the amplier is not
directly connected to the ground plane.
Figure 9. CEB002 Schematic
Figure 10. CEB002 Top View
Figure 11. CEB002 Bottom View
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 19/21 Rev 1E
Figure 12. CEB006 Schematic
Figure 13. CEB006 Top View
Figure 14. CEB006 Bottom View
ROUT1RF1
RIN1
RG1
IN1
OUT1
Board Mounting Holes
ROUT3RF3
RIN3
RG3
IN3
OUT3
ROUT2RF2
RIN2
RG2
IN2
OUT2
DIS1
DIS2
13
9
16
15
1
2
12
4
5
3,6
11,14
10
8
7
DIS3
Figure 15. CEB013 Schematic
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
©2007-2013 Exar Corporation 20/21 Rev 1E
Figure 16. CEB013 Top View Figure 17. CEB013 Bottom View
Mechanical Dimensions
SOT23-5 Package
Data Sheet
Comlinear CLC1605, CLC2605, CLC3605 1.5GHz Ampliers Rev 1E
For Further Assistance:
Exar Corporation Headquarters and Sales Ofces
48720 Kato Road Tel.: +1 (510) 668-7000
Fremont, CA 94538 - USA Fax: +1 (510) 668-7001
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specic application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to signicantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage
has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
©2007-2013 Exar Corporation 21/21 Rev 1E
Mechanical Dimensions
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SOIC-16 Package
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