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For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 1
The HMC720LP3E is a 1:2 Fanout Buffer designed to
support data transmission rates up to 14 Gbps, and
clock frequencies as high as 14 GHz.
All differential inputs to the HMC720LP3E are CML and
terminated on-chip with 50 Ohms to the positive supply,
GND, and may be DC or AC coupled. Outputs can be
connected directly to a 50 Ohm ground-terminated
system or drive devices with CML logic input. The
HMC720LP3E also features an ouput level control pin,
VR, which allows for loss compensation or signal level
optimization. The HMC720LP3E operates from a single
-3.3 V supply and is available in ROHS-compliant 3x3
mm SMT package.
General Description
HMC720LP3E
Features
Functional Diagram
Inputs Terminated Internally in 50 Ohms
Differential Inputs are DC Coupled
Propagation Delay: 120 ps
Fast Rise and Fall Times: 19 / 18 ps
Programmable Differential Output
Voltage Swing: 600 - 1100 mVp-p
Power Dissipation: 300 mW
Single Supply: -3.3 V
16 Lead 3x3 mm SMT Package: 9 mm
Typical Applications
The HMC720LP3E is ideal for:
• 16 G Fiber Channel
• RF ATE Applications
• Broadband Test & Measurement
• Serial Data Transmission up to 14 Gbps
• Clock Buffering up to 14 GHz
Electrical Speci cations, TA = +25 ºC, Vee = -3.3 V, VR = 0 V
Parameter Conditions Min. Typ. Max Units
Power Supply Voltage -3.6 -3.3 -3.0 V
Power Supply Current 90 mA
Maximum Data Rate 14 Gbps
Maximum Clock Rate 14 GHz
Input Voltage Range -1.5 0.5 V
Input Differential Range 0.1 2.0 Vp-p
Input Return Loss Frequency <13 GHz 10 dB
Output Amplitude Single-Ended, peak-to-peak 550 mVp-p
Differential, peak-to-peak 1100 mVp-p
Output High Voltage -10 mV
Output Low Voltage -560 mV
Output Rise / Fall Time Single-Ended, 20% - 80% 19 / 18 ps
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
v01.1010
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 2
Electrical Speci cations (continued)
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Parameter Conditions Min. Typ. Max Units
Output Return Loss Frequency <13 GHz 10 dB
Small Signal Gain 27 dB
Random Jitter JRrms 0.2 ps rms
Deterministic Jitter, JDδ - δ, 215-1 PRBS input [1] 26ps
Propagation Delay, td 120 ps
D1 to D2 Data Skew, tSKEW 0ps
VR Pin Current VR = 0.0 V 2 mA
VR Pin Current VR = +0.4 V 3.5 mA
[1] Deterministic jitter measured at 13 GHz with a 300 mVp-p, 215-1 PRBS input sequence.
[1] VR = 0.0 V [2] Frequency = 13 GHz [3] Frequency = 10 GHz [4] Vee = -3.3 V
DC Current vs. Supply Voltage [1][2]
Output Differential Voltage vs. VR [3][4]
70
75
80
85
90
95
100
105
110
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
+25C
+85C
-40C
DC CURRENT (mA)
SUPPLY VOLTAGE (V)
Output Differential Voltage
vs. Supply Voltage [1][3]
Output Differential Voltage
vs. Frequency [1][4]
700
800
900
1000
1100
1200
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
+25C
+85C
-40C
VOUT DIFFERENTIAL (mVp-p)
SUPPLY VOLTAGE (V)
500
600
700
800
900
1000
1100
1200
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
+25C
+85C
-40C
VOUT DIFFERENTIAL (mVp-p)
VR (V)
700
800
900
1000
1100
1200
1300
6 8 10 12 14 16
VOUT DIFFERENTIAL (mVp-p)
INPUT FREQUENCY (GHz)
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 3
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
[1] VR = 0.0 V [2] Frequency = 13 GHz [3] Vee = -3.3 V
Input Return Loss vs. Frequency Output Return Loss vs. Frequency
Rise / Fall Time vs. VR [2][3]
Rise / Fall Time vs. Supply Voltage [1][2]
-40
-35
-30
-25
-20
-15
-10
02468101214
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
02468101214
RETURN LOSS (dB)
FREQUENCY (GHz)
10
12
14
16
18
20
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
tr
tf
RISE/FALL TIME (ps)
VR (V)
10
12
14
16
18
20
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
tr
tf
RISE/FALL TIME (ps)
SUPPLY VOLTAGE (V)
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 4
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Eye Diagram
Timing Diagram
Truth Table
Input Outputs
DIN D1 D2
LLL
HHH
Notes:
DIN = DINP - DINN
D1 = D1P - D1N
D2 = D2P - D2N
H - Positive differential voltage
L - Negative differential voltage
[1] Test Conditions:
Pattern generated with an Agilent N4903A Serial BERT.
Eye Diagram presented on a Tektronix CSA 8000.
Device input = 10 Gbps PN code, Vin = 300 mVp-p differential.
Both output channels shown.
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 5
Absolute Maximum Ratings
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
Power Supply Voltage (Vee) -3.75 V to +0.5 V
Input Signals -2 V to +0.5 V
Output Signals -1.5 V to +1 V
Junction Temperature 125 °C
Continuous Pdiss (T = 85 °C)
(derate 20.4 mW/°C above 85 °C) 0.816 W
Thermal Resistance (Rthj-p)
Worst case junction to package
paddle
49 °C/W
Storage Temperature -65 °C to +150 °C
Operating Temperature -40 °C to +85 °C
ESD Sensitivity (HBM) Class 1C
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
NOTES:
1. LEADFRAME MATERIAL: COPPER ALLOY
2. DIMENSIONS ARE IN INCHES [MILLIMETERS]
3. LEAD SPACING TOLERANCE IS NON-CUMULATIVE
4. PAD BURR LENGTH SHALL BE 0.15 mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05 mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05 mm.
6. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
7. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED
LAND PATTERN.
8. PADDLE MUST BE SOLDERED TO Vee.
Part Number Package Body Material Lead Finish MSL Rating Package Marking [3]
HMC720LP3E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] 720
XXXX
[1] Max peak re ow temperature of 235 °C
[2] Max peak re ow temperature of 260 °C
[3] 4-Digit lot number XXXX
Package Information
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 6
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Pin Number Function Description Interface Schematic
1, 4, 5, 8, 9, 12 GND Signal Grounds
2, 3
10, 11
D1P, D1N
D2N, D2P
Differential Clock / Data Outputs: Current Mode Logic
(CML) referenced to positive supply.
6, 7 DINP, DINN Differential Clock / Data Inputs: Current Mode Logic (CML)
referenced to positive supply
13, 16 GND Supply Ground
14 VR
Output level control. Output level may be adjusted by
either applying a voltage to VR per “Output Differential vs.
VR” plot.
15, Package
Base Vee Negative Supply
Pin Descriptions
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 7
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Evaluation PCB
The circuit board used in the application should use
RF circuit design techniques. Signal lines should
have 50 Ohm impedance while the package gro-
und leads should be connected directly to the
ground plane similar to that shown. The exposed
packaged base should be connected to Vee. A
sufficient number of via holes should be used to
connect the top and bottom ground planes. The
evaluation circuit board shown is available from
Hittite upon request. Install jumper on JP1 to short
VR to GND for normal operation.
List of Materials for Evaluation PCB 118777 [1]
Item Description
J1 - J6 PCB Mount SMA RF Connectors
J7 - J9 DC Pin
JP1 0.1” Header with Shorting Jumper
C1, C2 100 pF, Capacitor, 0402 Pkg
C3, C4 4.7 µF Capacitor, Tantalum
R1 10 Ohm Resistor, 0603 Pkg.
U1 HMC720LP3E
High Speed Logic, Fanout Buffer
PCB [2] 118775 Evaluation Board
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: Arlon 25FR or Rogers 4350
For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824
Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
Application Support: Phone: 978-250-3343 or apps@hittite.com
HIGH SPEED LOGIC - SMT
3
3 - 8
HMC720LP3E
v01.1010
14 Gbps, FAST RISE TIME 1:2 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Application Circuit
