XR1009, XR2009
0.2mA, 35MHz Rail-to-Rail Amplifiers
© 2014 Exar Corporation 1 / 16 exar.com/XR1009
Rev 1B
FEATURE S
■ 208μA supply current
■ 35MHz bandwidth
■ Input voltage range with 5V supply:
-0.3V to 3.8V
■ Output voltage range with 5V supply:
0.08V to 4.88V
■ 27V/μs slew rate
■ 21nV/√Hz input voltage noise
■ 13mA linear output current
■ Fully specified at 2.7V and 5V supplies
■ Replaces MAX4281
APP LICATIO NS
■ Portable/battery-powered applications
■ Mobile communications, cell phones,
pagers
■ ADC buffer
■ Active lters
■ Portable test instruments
■ Signal conditioning
■ Medical equipment
■ Portable medical instrumentation
■ Interactive whiteboards
General Description
The XR1009 (single) and XR2009 (dual) are ultra-low power, low cost,
voltage feedback ampliers. These ampliers use only 208μA of supply
current and are designed to operate from a supply range of 2.5V to 5.5V
(±1.25 to ±2.75). The input voltage range extends 300mV below the negative
rail and 1.2V below the positive rail.
The XR1009 and XR2009 offer superior dynamic performance with a
35MHz small signal bandwidth and 27V/μs slew rate. The combination of
low power, high bandwidth, and rail-to-rail performance make the XR1009
and XR2009 well suited for battery-powered communication/ computing
systems.
Frequency Response
+
-
Rg
0.1μF
6.8μF
Out
In
+2.7
+
Rf
RIN ROUT
XR1009
Output Swing vs. RL
Output Swing (Vpp)
RL (k1)
110 100
4.55
4.60
4.70
4.85
4.75
4.80
4.65
© 2014 Exar Corporation 2 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Absolute Maximum Ratings
Stresses beyond the limits listed below may cause
permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect
device reliability and lifetime.
VS ..................................................................................... 0V to 6V
VIN ............................................................ -VS - 0.5V to +VS +0.5V
Continuous Output Current ..................................-30mA to +30mA
Operating Conditions
Supply Voltage Range ...................................................2.5 to 5.5V
Operating Temperature Range ...............................-40°C to 125°C
Junction Temperature ........................................................... 150°C
Storage Temperature Range ...................................-65°C to 150°C
Lead Temperature (Soldering, 10s) ......................................260°C
Package Thermal Resistance
θJA (TSOT23-5) ................................................................215°C/W
θJA (SOIC-8) .....................................................................150°C/W
θJA (MSOP-8) .................................................................. 200°C/W
Package thermal resistance (θJA), JEDEC standard, multi-layer
test boards, still air.
ESD Protection
XR1009 (HBM) .........................................................................2kV
XR2009 (HBM) ......................................................................2.5kV
ESD Rating for HBM (Human Body Model).
© 2014 Exar Corporation 3 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Electrical Characteristics at +2.7V
TA = 25°C, VS = +2.7V, Rf = Rg = 2.5kΩ, RL = 2kΩ to VS/2; G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBWSS Unity Gain -3dB Bandwidth G = +1, VOUT = 0.05Vpp, Rf = 0 28 MHz
BWSS -3dB Bandwidth G = +2, VOUT < 0.2Vpp 15 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 2Vpp 7 MHz
GBWP Gain Bandwidth Product G = +11, VOUT = 0.2Vpp 16 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 0.2V step; (10% to 90%) 16 ns
tSSettling Time to 0.1% VOUT = 1V step 140 ns
OS Overshoot VOUT = 1V step 1 %
SR Slew Rate G = -1, 2V step 20 V/μs
Distortion/Noise Response
HD2 2nd Harmonic Distortion 100kHz, VOUT = 1Vpp -85 dBc
HD3 3rd Harmonic Distortion 100kHz, VOUT = 1Vpp -63 dBc
THD Total Harmonic Distortion 100kHz, VOUT = 1Vpp 62 dB
enInput Voltage Noise >10kHz 23 nV/√Hz
XTALK Crosstalk 100kHz, VOUT = 0.2Vpp 98 dB
DC Performance
VIO Input Offset Voltage 0.8 mV
dVIO Average Drift 11 μV/°C
IBInput Bias Current 0.37 μA
dIBAverage Drift 1 nA/°C
IOS Input Offset Current 8 nA
PSRR Power Supply Rejection Ratio DC 56 60 dB
AOL Open Loop Gain VOUT = VS / 2 65 dB
ISSupply Current per channel 185 μA
Input Characteristics
RIN Input Resistance Non-inverting >10 MΩ
CIN Input Capacitance 1.4 pF
CMIR Common Mode Input Range -0.3 to
1.5 V
CMRR Common Mode Rejection Ratio DC, VCM = 0V to VS - 1.5V 92 dB
Output Characteristics
VOUT Output Voltage Swing
RL = 2kΩ to VS / 2 0.08 to
2.6 V
RL = 10kΩ to VS / 2 0.06 to
2.62 V
IOUT Output Current ±8 mA
ISC Short Circuit Current ±12.5 mA
© 2014 Exar Corporation 4 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Electrical Characteristics at +5V
TA = 25°C, VS = +5V, Rf = Rg = 2.5kΩ, RL = 2kΩ to VS/2; G = 2; unless otherwise noted.
Symbol Parameter Conditions Min Typ Max Units
Frequency Domain Response
UGBWSS Unity Gain -3dB Bandwidth G = +1, VOUT = 0.05Vpp, Rf = 0 35 MHz
BWSS -3dB Bandwidth G = +2, VOUT < 0.2Vpp 18 MHz
BWLS Large Signal Bandwidth G = +2, VOUT = 2Vpp 8 MHz
GBWP Gain Bandwidth Product G = +11, VOUT = 0.2Vpp 20 MHz
Time Domain Response
tR, tFRise and Fall Time VOUT = 0.2V step; (10% to 90%) 13 ns
tSSettling Time to 0.1% VOUT = 1V step 140 ns
OS Overshoot VOUT = 1V step 1 %
SR Slew Rate G = -1, 2V step 27 V/μs
Distortion/Noise Response
HD2 2nd Harmonic Distortion 100kHz, VOUT = 2Vpp -78 dBc
HD3 3rd Harmonic Distortion 100kHz, VOUT = 2Vpp -66 dBc
THD Total Harmonic Distortion 100kHz, VOUT = 2Vpp 65 dB
enInput Voltage Noise >10kHz 21 nV/√Hz
XTALK Crosstalk 100kHz, VOUT = 0.2Vpp 98 dB
DC Performance
VIO Input Offset Voltage -5 -1.5 5 mV
dVIO Average Drift 20 μV/°C
IBInput Bias Current -1.3 0.37 1.3 μA
dIBAverage Drift 1 nA/°C
IOS Input Offset Current 7 130 nA
PSRR Power Supply Rejection Ratio DC 56 60 dB
AOL Open Loop Gain VOUT = VS / 2 56 62 dB
ISSupply Current per channel 208 260 μA
Input Characteristics
RIN Input Resistance Non-inverting >10 MΩ
CIN Input Capacitance 1.2 pF
CMIR Common Mode Input Range -0.3 to
3.8 V
CMRR Common Mode Rejection Ratio DC, VCM = 0V to VS - 1.5V 65 95 dB
Output Characteristics
VOUT Output Voltage Swing
RL = 2kΩ to VS / 2 0.2 to
4.7
0.1 to
4.8 V
RL = 10kΩ to VS / 2 0.08 to
4.88 V
IOUT Output Current ±8.5 mA
ISC Short Circuit Current ±13 mA
© 2014 Exar Corporation 5 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
SOIC-8
Pin No. Pin Name Description
1 NC No Connect
2 -IN Negative input
3 +IN Positive input
4 -VSNegative supply
5 NC No Connect
6 OUT Output
7 +VSPositive supply
8 NC No Connect
SOIC-8
-
+
1
2
3
4
NC
-IN
+IN
-Vs
NC
+Vs
OUT
NC
8
7
6
5
XR1009 Pin Assignments
TSOT-5
Pin No. Pin Name Description
1 OUT Output
2 -VSNegative supply
3 +IN Positive input
4 -IN Negative input
5 +VSPositive supply
XR1009 Pin Congurations
TSOT-5
-
+
2
3
5
4
+IN
+Vs
-IN
1
-Vs
OUT
XR2009 Pin Assignments
SOIC-8 / MSOP-8
Pin No. Pin Name Description
1 OUT1 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
7 OUT2 Output, channel 2
8 +VSPositive supply
XR2009 Pin Conguration
SOIC-8 / MSOP-8
-
+
-
+
1
2
3
4
OUT1
-IN1
+IN1
-Vs
+Vs
OUT2
-IN2
+IN2
8
7
6
5
© 2014 Exar Corporation 6 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Typical Performance Characteristics
TA = 25°C, VS = +5V, Rf = Rg = 2.5kΩ, RL = 2kΩ to VS/2; G = 2; unless otherwise noted.
Frequency Response vs. VOUT Open Loop Gain & Phase vs. Frequency
Non-Inverting Frequency Response at VS = 2.7V Inverting Frequency Response at VS = 2.7V
Non-Inverting Frequency Response at VS = 5V Inverting Frequency Response at VS = 5V
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.1 1
G = 10
10 100
G = 5
G = 1
Rf = 0
G = 2
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.1 1
G = -10
10 100
G = -5
G = -2
G = -1
Normalized Magnitude (2dB/div)
Frequency (MHz)
0.1 1
G = 10
10 100
G = 5
G = 2
G = 1
Rf = 0
Normalized Magnitude (1dB/div)
Frequency (MHz)
0.1 1
G = -10
10 100
G = -5
G = -1
G = -2
Magnitude (1dB/div)
Frequency (MHz)
0.1 110 100
Vo = 1Vpp
Vo = 2Vpp
Open Loop Gain (dB)
Frequency (Hz)
10 100 1k 1M100k10k 10M
-20
0
20
100
40
80
60
Open Loop Phase (deg)
-200
-160
-120
40
-80
0
-40
Gain
Phase
© 2014 Exar Corporation 7 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Typical Performance Characteristics
TA = 25°C, VS = +5V, Rf = Rg = 2.5kΩ, RL = 2kΩ to VS/2; G = 2; unless otherwise noted.
Small Signal Pulse Response Large Signal Pulse Response
CMRR PSRR
2nd & 3rd Harmonic Distortion at VS = 5V 2nd & 3rd Harmonic Distortion at VS = 2.7V
Distortion (dBc)
Frequency (kHz)
10 100
3rd
1000
2nd
-100
-90
-80
-70
-60
-50
-40 Vo = 2Vpp
Distortion (dBc)
Frequency (kHz)
10 100
3rd
1000
2nd
-100
-90
-80
-70
-60
-50
-40 Vo = 1Vpp
CMRR (dB)
Frequency (Hz)
10 100 1k 1M100k10k 10M
-100
-90
-80
-70
-20
-60
-50
-30
-40
PSRR (dB)
Frequency (Hz)
100 1k 10k 1M100k 10M
-70
-60
-50
-40
-30
10
-20
-10
0
Output Voltage (0.05V/div)
Time (1ms/div)
Output Voltage (0.5V/div)
Time (1+s/div)
© 2014 Exar Corporation 8 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Typical Performance Characteristics
TA = 25°C, VS = +5V, Rf = Rg = 2.5kΩ, RL = 2kΩ to VS/2; G = 2; unless otherwise noted.
Output Swing vs. RL Input Voltage Noise
Output Swing (Vpp)
RL (k1)
110 100
4.55
4.60
4.70
4.85
4.75
4.80
4.65
Voltage Noise (nV/¥Hz)
Frequency (Hz)
100 1k 10k 1M
0
20
40
60
80
100
100k
© 2014 Exar Corporation 9 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Application Information
General Description
The XR1009 and XR2009 are a single supply, general
purpose, voltage-feedback ampliers fabricated on a
complementary bipolar process. The XR1009 offers 35MHz
unity gain bandwidth, 27V/μs slew rate, and only 208μA
supply current. It features a rail-to-rail output stage and is
unity gain stable.
The design utilizes a patent pending topology that provides
increased slew rate performance. The common mode input
range extends to 300mV below ground and to 1.2V below
Vs. Exceeding these values will not cause phase reversal.
However, if the input voltage exceeds the rails by more than
0.5V, the input ESD devices will begin to conduct. The output
will stay at the rail during this overdrive condition.
The design uses a Darlington output stage. The output
stage is short circuit protected and offers “soft” saturation
protection that improves recovery time.
Figures 1, 2, and 3 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 4 shows the typical non-inverting gain circuit for
single supply applications.
+
-
Rf
0.1μF
6.8μF
Output
G = 1 + (Rf/Rg)
Input
+Vs
-Vs
Rg
0.1μF
6.8μF
RL
Figure 1: Typical Non-Inverting Gain Circuit
+
-
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
Figure 2: Typical Inverting Gain Circuit
+
-
0.1μF
6.8μF
Output
G = 1
Input
+Vs
-Vs
0.1μF
6.8μF
RL
Figure 3: Unity Gain Circuit
+
-Rf
0.1μF
6.8μF
Out
In
+Vs
+
Rg
Figure 4: Single Supply Non-Inverting Gain Circuit
© 2014 Exar Corporation 10 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 2kΩ 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
(θJA) is used along with the total die power dissipation.
TJunction = TAmbient + (θJA × 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 × IRMSsupply
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 Figure 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.
The XR1009 is short circuit protected. However, this may not
guarantee that the maximum junction temperature (+150°C)
is not exceeded under all conditions. Figure 5 shows the
maximum safe power dissipation in the package vs. the
ambient temperature for the packages available.
0
0.5
1
1.5
-40 -20 0 20 40 60 80 100 120
Maximum Power Dissipation (W)
Ambient Temperature (°C)
MSOP-8
SOIC-8
TSOT-5
Figure 5. Maximum Power Derating
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.
+
-
Rf
Input
Output
Rg
Rs
CLRL
Figure 6. Addition of RS for Driving Capacitive Loads
Overdrive Recovery
For an amplier, an overdrive condition occurs when the
output and/or input ranges are exceeded. The recovery time
varies based on whether the input or output is overdriven
and by how much the ranges are exceeded. The XR1009,
and XR2009 will typically recover in less than 20ns from an
overdrive condition.
© 2014 Exar Corporation 11 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
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 an 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.
Evaluation Board Information
The following evaluation boards are available to aid in the
testing and layout of these devices:
Evaluation Board # Products
CEB002 XR1009 in TSOT
CEB003 XR1009 in SOIC
CEB006 XR2009 in SOIC
CEB010 XR2009 in MSOP
Evaluation Board Schematics
Evaluation board schematics and layouts are shown in
Figures 9-18 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 & CEB003 Schematic
Figure 10. CEB002 Top View
© 2014 Exar Corporation 12 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Figure 11. CEB002 Bottom View
Figure 12. CEB003 Top View
Figure 13. CEB003 Bottom View
Figure 14. CEB006 & CEB010 Schematic
Figure 15. CEB006 Top View
© 2014 Exar Corporation 13 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Figure 16. CEB006 Bottom View
Figure 17. CEB010 Top View
Figure 18. CEB010 Bottom View
© 2014 Exar Corporation 14 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Mechanical Dimensions
TSOT-5 Package
MSOP-8 Package
© 2014 Exar Corporation 15 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
SOIC-8 Package
For Further Assistance:
Email: CustomerSupport@exar.com or HPATechSupport@exar.com
Exar Technical Documentation: http://www.exar.com/techdoc/
Exar Corporation Headquarters and Sales Offices
48760 Kato Road Tel.: +1 (510) 668-7000
Fremont, CA 94538 - USA Fax: +1 (510) 668-7001
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.
© 2014 Exar Corporation 16 / 16 exar.com/XR1009
Rev 1B
XR1009, XR2009
Ordering Information
Part Number Package Green Operating Temperature
Range Packaging Quantity Marking
XR1009 Ordering Information
XR1009IST5X TSOT-5 Yes -40°C to +125°C 2.5k Tape & Reel UC
XR1009IST5MTR TSOT-5 Yes -40°C to +125°C 250 Tape & Reel UC
XR1009IST5EVB Evaluation Board N/A N/A N/A N/A
XR1009ISO8X SOIC-8 Yes -40°C to +125°C 2.5k Tape & Reel XR1009
XR1009ISO8MTR SOIC-8 Yes -40°C to +125°C 250 Tape & Reel XR1009
XR1009ISO8EVB Evaluation Board N/A N/A N/A N/A
XR2009 Ordering Information
XR2009ISO8X SOIC-8 Yes -40°C to +125°C 2.5k Tape & Reel XR2009
XR2009ISO8MTR SOIC-8 Yes -40°C to +125°C 250 Tape & Reel XR2009
XR2009ISO8EVB Evaluation Board N/A N/A N/A N/A
XR2009IMP8X MSOP-8 Yes -40°C to +125°C 2.5k Tape & Reel 2009
XR2009IMP8MTR MSOP-8 Yes -40°C to +125°C 250 Tape & Reel 2009
XR2009IMP8EVB Evaluation Board N/A N/A N/A N/A
Moisture sensitivity level for all parts is MSL-1.
Revision History
Revision Date Description
1A June 2014 Initial Release
1B Sept 2014 Added XR1009 ESD, increased operating temperature range, updated package outline drawings, and removed
Preliminary note on XR1009.
[ECN 1426-10 l 06/24/14]
[ECN
1436-03 l 09/04/14]