For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
1
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
The HMC940LC4B is a 1:4 Fanout Buffer designed to
support data transmission rates up to 13 Gbps, and
clock frequencies as high as 13 GHz. All differential
inputs and outputs are DC coupled and terminated on
chip with 50 Ohm resistors to ground. The outputs may
be used in either single-ended or differential modes,
and should be AC or DC coupled into 50 Ohm resistors
connected to ground.
The HMC940LC4B also features an output level control
pin, VR which allows for loss compensation or for signal
level optimization. The HMC940LC4B operates from a
single -3.3V DC supply and is available in a ceramic
RoHS compliant 4x4 mm SMT package.
General Description
Features
Functional Diagram
Inputs Terminated Internally in 50 Ohms
Differential Inputs are DC Coupled
Propagation Delay: 101 ps
Fast Rise and Fall Times: 26 / 25 ps
Programmable Differential
Output Voltage Swing: 600 - 1400 mV
Power Dissipation: 440 mW
24 Lead Ceramic 4x4 mm SMT Package: 16 mm2
Typical Applications
The HMC940LC4B is ideal for:
• RF ATE Applications
• Broadband Test & Measurement
• Serial Data Transmission up to 13 Gbps
• Clock Buffering up to 13 GHz
Electrical Specications, TA = +25 ºC Vee = -3.3V, VR = 0V
Parameter Conditions Min. Typ. Max Units
Power Supply Voltage (Vee) -3.6 -3.3 -3.0 V
Power Supply Current 133 mA
Maximum Data Rate 13 Gbps
Maximum Clock Rate 13 GHz
Input High Voltage -0.5 0.5 V
Input Low Voltage -1.0 0.0 V
Input Return Loss Frequency <15 GHz 10 dB
Output Amplitude Single-Ended, peak-to-peak 585 mVp-p
Differential, peak-to-peak 1170 mVp-p
Output High Voltage -15 mV
Output Low Voltage -600 mV
Output Rise / Fall Time Single-Ended, 20% - 80% 26 / 25 ps
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
2
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Electrical Specications (continued)
Parameter Conditions Min. Typ. Max Units
Output Return Loss Frequency <13 GHz 10 dB
Small Signal Gain 20 dB
Random Jitter JRrms 0.2 ps rms
Deterministic Jitter, JDδ - δ, 215-1 PRBS input [1] 4 6 ps
Propagation Delay, td 101 ps
D1 to D2 Data Skew, tSKEW ±3 ps
[1] Deterministic jitter measured at 13 Gbps with a 300 mVp-p, 215-1 PRBS input sequence.
[1] VR = 0.0V [2] Frequency = 13 GHz [3] Vee = -3.3V
DC Current vs. Supply Voltage [1] [2] Output Differential vs. Supply Voltage [1] [2]
Output Differential vs. VR [2][3]
90
100
110
120
130
140
150
160
170
-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)
500
600
700
800
900
1000
1100
1200
1300
1400
1500
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
+25C
+85C
-40C
DIFFERENTIAL VOLTAGE (mV)
VR (V)
500
600
700
800
900
1000
1100
1200
1300
1400
1500
-3.7 -3.6 -3.5 -3.4 -3.3 -3.2 -3.1 -3 -2.9
+25C
+85C
-40C
DIFFERENTIAL VOLTAGE (mV)
SUPPLY VOLTAGE (V)
DC Current vs. VR [2][3]
70
80
90
100
110
120
130
140
150
160
170
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
+25C
+85C
-40C
DC CURRENT (mA)
VR (V)
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
3
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
[1] VR = 0.0V [2] Frequency = 13 GHz [3] Device measured on evaluation board with gating after connector
[4] Device measured on evaluation board with port extensions [5] Vee = -3.3V
Input Return Loss vs. Frequency [1][3][5]
Amplitude vs. Input Power [1][4][5]
Output Return Loss vs. Frequency [1][3][5]
-40
-35
-30
-25
-20
-15
-10
-5
0
5
0 3 6 9 12 15
RETURN LOSS (dB)
FREQUENCY (GHz)
-40
-35
-30
-25
-20
-15
-10
-5
0
5
0 3 6 9 12 15
RETURN LOSS (dB)
FREQUENCY (GHz)
-10
-5
0
5
10
15
20
25
0 3 6 9 12 15
-20 dBm
-15 dBm
-10 dBm
-5 dBm
0 dBm
AMPLITUDE (dB)
FREQUENCY (GHz)
Rise / Fall Time vs. VR [2][5]
20
22
24
26
28
30
-1.2 -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4
tr
tf
RISE/FALL TIME (ps)
VR (V)
Rise / Fall Time vs. Supply Voltage [1][2]
20
22
24
26
28
30
-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)
Truth Table
Input Outputs
IN Ox
L L
H H
Notes:
IN = INP - INN
Ox = OxP - OxN
H - Positive differential voltage
L - Negative differential voltage
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
4
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Eye Diagram
Eye Diagram
Timing Diagram
[1] Test Conditions:
Pattern generated with an Agilent N4903A Serial BERT.
Eye Diagram presented on a Tektronix CSA 8000.
Device input = 13 Gbps PN code, Vin = 300 mVp-p differential.
Both output channels shown.
[2] 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, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
5
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
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 30 mW/°C above 85 °C 1.22 W
Thermal Resistance (Rth j-p)
Worse case junction to package
paddle
32.8 °C/W
Storage Temperature -65 °C to +150 °C
Operating Temperature -40 °C to +85 °C
ESD Sensitivity (HBM) Class 1C
NOTES:
1. PACKAGE BODY MATERIAL: ALUMINA
2. LEAD AND GROUND PADDLE PLATING:
30-80 MICROINCHES GOLD OVER 50 MICROINCHES MINIMUM NICKEL.
3. DIMENSIONS ARE IN INCHES [MILLIMETERS].
4. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm DATUM -C-
6. ALL GROUND LEADS MUST BE SOLDERED TO PCB RF GROUND.
7. EXPOSED PADDLE MUST BE SOLDERED TO VEE
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
6
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Pin Number Function Description Interface Schematic
1, 6, 8, 11, 13,
18, 19, 24 GND These pins must be connected to
a high quality RF/DC ground.
2, 3,
4, 5,
14, 15,
16, 17
O1P, O1N,
O2P, O2N,
O3N, O3P,
O4N, O4P
Differential Outputs: Current Mode Logic (CML)
referenced to positive supply.
7, 12, 22 N/C
The pins are not connected internally; however, all data
shown herein was measured with these pins connected to
RF/DC ground externally.
9, 10 INP, INN Differential Inputs: Current Mode Logic (CML)
referenced to positive supply
20, 23
Package Base Vee These pins and the exposed paddle must be
connected to the negative voltage supply.
21 VR
Output level control. Output level may be increased
or decreased by applying a voltage to VR per “Output
Differential vs. VR” plot.
Pin Descriptions
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
7
HMC940LC4B
v01.0313
13 Gbps, 1:4 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 126572 [1]
Item Description
J1 - J10 PCB Mount SMA RF Connectors
J15 - J18 DC Pin
JP1 0.1” Header with Shorting Jumper
C1, C2 4.7 µF Capacitor, Tantalum
C3 - C5 100 pF, Capacitor, 0603 Pkg
R1 10 Ohm Resistor, 0603 Pkg.
U1 HMC940LC4B
High Speed Logic, Fanout Buffer
PCB [2] 126570 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, 2 Elizabeth Drive, 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 DIGITAL LOGIC - SMT
8
HMC940LC4B
v01.0313
13 Gbps, 1:4 FANOUT BUFFER
w/ PROGRAMMABLE OUTPUT VOLTAGE
Application Circuit
