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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 fo@hittite.com
limiting amplifiers - smt
1
HMC914LP4E
v03.1012
Functional Diagram
Electrical Specications, TA = +25° C, Vcc = +3.3V
The HMC914LP4E is ideal for:
• SONET/SDH-Based Transmission Systems
• OC-192 Fiber Optic Modules
• 10 Gigabit Ethernet
• 8x and 10x Fiber Channel
• Wideband RF Gain Block
Supports Data Rates up to 12.5 Gbps
Differential Small Signal Gain: 32 dB
Programmable Loss-of-Signal Detection (LOS)
Automatic Output Disable Mode
Adjustable Output Voltage Swing
up to 750 mVp-p Differential
Integrated DC Offset Correction
Received Signal Strength Indicator (RSSI) Output
24 Lead Plastic 4x4mm SMT Package: 16mm²
HMC914LP4E is a limiting amplier designed to
support data transmission rates up to 12.5 Gbps.
The amplier can operate over a wide range of input
voltage levels and provides constant-level differential
output swing. HMC914LP4E features a loss of signal
(LOS) indicator output where the input signal amplitude
threshold level can be adjusted using the LOSTH pin.
HMC914LP4E also features an output level control
pin, VAC, which allows for loss compensation or for
output signal level optimization. Differential output
signal swing can be adjusted up to 750 mVp-p. An
integrated DC offset compensation is also provided
on chip. The HMC914LP4E provides an analog RSSI
output voltage which is proportional to input signal
amplitude.
All single-ended input signals are terminated with
50 ohms to +3.3V on-chip, and may be either AC or
DC coupled. The outputs of the HMC914LP4E may
be operated either differentially or single-ended. The
HMC914LP4E operates from a single +3.3V DC supply
and is available in a plastic RoHS compliant 4x4 mm
SMT package.
Parameter Conditions Min. Typ. Max. Units
Power Supply Voltage, Vcc 3 3.3 3.6 V
Supply Current, Icc VAC = 1V 47 mA
Output Amplitude Control Voltage, VAC 0.4 2.2 V
Differential Small Signal Gain VAC = 1V 32 dB
Maximum Data Rate 12.5 Gbps
Small Signal Bandwidth, f3dB-H 3-dB cutoff frequency 9.5 GHz
Low Frequency Cut-off, f3dB-L 100 nF off chip cap is used 10 kHz
Typical Applications Features
General Description
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
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 fo@hittite.com
limiting amplifiers - smt
2
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Parameter Conditions Min. Typ. Max. Units
Input return loss, S11 Up to 12 GHz 12 dB
Output return loss, S22 Up to 12 GHz 11 dB
Input Sensitivity [1] VAC = 1V 15 mVp-p
Maximum Input Swing VAC = 1V 1200 mVp-p diff
Adjustable Data Output Swing Range VAC = 0.4V - 2.2V 240 750 mVp-p diff
Output P1dB [2] @ 5 GHz, VAC = 1V -9.5 dBm
Rise time, tr [3] VAC = 1V, %20 to %80 29 ps
Fall time, tf [3] VAC = 1V, %80 to %20 29 ps
Additive RMS jitter, Jd [4] VAC = 1V 0.3 ps
Input referred voltage noise @ 5 GHz 3.8 nV/rtHz
@ 8 GHz 3.6 nV/rtHz
DISABLE Input HIGH Voltage, VIH 2 Vcc V
DISABLE Input LOW Voltage, VIL 0 0.8 V
AODWNENB Input HIGH Voltage, VIH 2 Vcc V
AODWNENB Input LOW Voltage, VIL 0 0.8 V
LOS assert threshold level [5]
RTH = 80 kOhm between LOSTH and
GND, Single-Ended 20 mV
RTH = 8.5 kOhm between LOSTH and
VCC, Single-Ended 380 mV
LOS Assert/Deassert Threshold Level [5]
assert, LOSTH internally
set, single-ended 63 mV
deassert, LOSTH internally
set, single-ended 110 mV
LOS Hysteresis [5][6]
RTH between LOSTH and VCC 2 4.8 dB
RTH between LOSTH and GND 5.8 12.2 dB
LOSTH internally set 4.84 dB
LOS Output HIGH Voltage 1.82 kOhm to VCC (RLOS)3.3 V
LOS Output LOW Voltage 1.82 kOhm to VCC (RLOS)2.65 V
RSSI Sensitivity 2.7 mV/V
[1] Signal-ended input signal level for limited output
[2] Single-ended output
[3] Data Amplitude: Differential 200 mVp-p, Data Rate: 10 Gbps PRBS 223-1 pattern
[4] Data Amplitude: Differential 200 mVp-p, Data Rate: 10 Gbps 10101... pattern
[5] See application notes for detailed information
[6] LOS Hysteresis=20*Log(LOS deassert/LOS assert)
Electrical Specications (Continued)
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 fo@hittite.com
limiting amplifiers - smt
3
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Differential Gain & Return Loss
vs. Frequency [1] [2]
DC Current vs. Supply Voltage [1] [3]
DC Current vs. VAC [2] [3] Differential Output Swing vs. VAC [2] [3]
Differential Gain vs. Frequency
& Temperature [1] [2]
Differential Output Swing vs.
Supply Voltage [1] [3]
[1] VAC = 1V [2] VCC=3.3V [3] Input Data: Differential 200 mVp-p 10 Gbps NRZ PRBS 223-1 pattern
-40
-30
-20
-10
0
10
20
30
40
024681012
S21
S11
S22
FREQUENCY (GHz)
RESPONSE (dB)
30
40
50
60
3 3.1 3.2 3.3 3.4 3.5 3.6
+25C
+85C
-40C
SUPPLY VOLTAGE Vcc (V)
DC CURRENT (mA)
30
40
50
60
70
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
+25C
+85C
-40C
CONTROL VOLTAGE VAC (V)
DC CURRENT (mA)
-10
0
10
20
30
40
50
024681012
+25C
+85C
-40C
FREQUENCY (GHz)
GAIN (dB)
350
400
450
500
550
600
3 3.1 3.2 3.3 3.4 3.5 3.6
+25C
+85C
-40C
SUPPLY VOLTAGE Vcc (V)
DIFFERENTIAL VOLTAGE (mVp-p)
0
200
400
600
800
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
+25C
+85C
-40C
CONTROL VOLTAGE VAC (V)
DIFFERENTIAL VOLTAGE (mVp-p)
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 fo@hittite.com
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Rise Time vs. VAC [1] [2]
RMS Jitter vs. VAC [1] [3]
Fall Time vs. VAC [1] [2]
RMS Jitter vs. Single-Ended
Input Voltage [1] [4] [5]
RSSI Voltage vs. Single-Ended
Input Voltage [1] [4] [5]
Differential Output Swing vs.
Single-Ended Input Voltage [1] [4] [5]
[1] VCC = 3.3V [2] Input Data: Differential 200 mVp-p 10 Gbps NRZ PRBS 223-1 pattern
[3] Input Data: Differential 200 mVp-p 10 Gbps 10101... pattern [4] VAC = 1V [5] Frequency = 5 GHz
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
10
20
30
40
50
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
+25C
+85C
-40C
CONTROL VOLTAGE VAC (V)
RISE TIME (ps)
0
0.1
0.2
0.3
0.4
0.5
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
+25C
+85C
-40C
CONTROL VOLTAGE VAC (V)
RMS JITTER (ps)
100
1000
1 10 100 1000
+25C
+85C
-40C
SINGLE-ENDED Vin (mVp-p)
DIFFERENTIAL VOLTAGE (mVp-p)
10
20
30
40
50
0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2
+25C
+85C
-40C
CONTROL VOLTAGE VAC (V)
FALL TIME (ps)
0
1
2
3
4
1 10 100 1000
+25C
+85C
-40C
SINGLE-ENDED Vin (mVp-p)
RMS JITTER (ps)
1
1.5
2
2.5
0 100 200 300 400 500
+25C
+85C
-40C
SINGLE-ENDED Vin (mVp-p)
RSSI (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 fo@hittite.com
limiting amplifiers - smt
5
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
11.25 Gbps Differential Output Eye Diagram
for 200 mVp-p Input
10 Gbps Differential Output Eye Diagram
for 10 mVp-p Input
Time Scale: 30 ps/div
Amplitude Scale: 100 mV/div
Test Conditions:
VCC = 3.3V, VAC = 1V
Data Input:
Differential 200 mVp-p 11.25 Gbps NRZ PRBS 223-1 pattern
Time Scale: 30 ps/div
Amplitude Scale: 90 mV/div
Test Conditions:
VCC = 3.3V, VAC = 1V
Data Input: Differential 10 mVp-p 10 Gbps NRZ PRBS 223-1 pattern
Current Minimum Maximum Total Meas
Eye Amp 481 mV 481 mV 482 mV 83
Rise Time 30.00 ps 30.00 ps 31.33 ps 83
Fall Time 28.67 ps 28.67 ps 29.33 ps 83
p-p Jitter 9.333 ps 6.667 ps 9.333 ps 83
Current Minimum Maximum Total Meas
Eye Amp 358 mV 358 mV 358 mV 81
Rise Time 36.00 ps 36.00 ps 3 7.3 3 p s 81
Fall Time 35.33 ps 34.67 ps 36.00 ps 81
p-p Jitter 15.333 ps 12.000 ps 15.333 ps 81
Power Supply Voltage (VCC) 3.8V to -0.5V
Input Voltage (INP-INN) 1V to 3.3V
Output Amplitude Control Voltage (VAC) 0 to 2.4V
Power down input voltage (DISABLE) 0 to 3.6V
Auto power down enable voltage
(AOPDWNENB) 0 to 3.6V
Loss of Signal threshold programming
current (LOSTH) ±3 mA
Channel Temperature 125 °C
Continuous Pdiss (T = 85 °C)
(derate 13.6 mW/°C above 85 °C ) 0.54 W
Thermal Resistance
(channel to package bottom) 73.5 °C/W
Storage Temperature -55 to 125 °C
Operating Temperature -40 to +85 °C
Absolute Maximum Ratings
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 fo@hittite.com
limiting amplifiers - smt
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Outline Drawing
Part Number Package Body Material Lead Finish MSL Rating Package Marking [1]
HMC914LP4E RoHS-compliant Low Stress Injection Molded Plastic 100% matte Sn MSL1 [2] H914
XXXX
[1] 4-Digit lot number XXXX
[2] Max peak reow temperature of 260 °C
Package Information
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 0.15mm MAXIMUM.
PAD BURR HEIGHT SHALL BE 0.05mm MAXIMUM.
5. PACKAGE WARP SHALL NOT EXCEED 0.05mm.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB RF GROUND.
7. REFER TO HMC APPLICATION NOTE FOR SUGGESTED PCB LAND PATTERN.
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
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 fo@hittite.com
limiting amplifiers - smt
7
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Pin Number Function Description Interface Schematic
1LOS
Loss of signal indicator. Open collector output. Requires
an external resistor to VCC. This output sinks 500 uA DC
current when input is lower than the threshold.
2, 5, 8, 9,
11, 12, 14, 17
Package Base
GND Signal and supply ground.
3, 4 INP, INN Differential (INP-INN) or single-ended (INP) data inputs.
6DISABLE Disables output buffer. Internally set to VCC. Data outputs
are enabled when DISABLE is high or oating.
7AODWNENB
Enables the automatic output disable feature. If asserted,
outputs automatically disable when the input signal is
below programmed loss threshold. Active low. Internally set
to VCC. Outputs enable when the input signal returns its
desired swing level.
10 VAC Output Amplitude Control.
Internally set for 500 mV differential p-p.
13 N/C
The pins are not connected internally; however, all data
shown herein was measured with these pins connected to
RF/DC ground externally.
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 fo@hittite.com
limiting amplifiers - smt
8
Pin Descriptions (Continued)
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Pin Number Function Description Interface Schematic
15, 16 QN, QP Differential data outputs
18, 21, 22 Vcc Power Supply (+3.3V)
19, 20 CN, CP Filter capacitor for offset correction. 100 nF should be
connected between these pins.
23 RSSI Received Signal Strength Output.
24 LOSTH Loss of signal threshold setting input. User programmable
with resistor to VCC or GND.
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 fo@hittite.com
limiting amplifiers - smt
9
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
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 ground
leads and exposed paddle should be connected
directly to the ground plane similar to that shown.
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 Hit-
tite upon request.
List of Materials for Evaluation PCB 128915 [1]
Item Description
J1 - J3 4 Pin DC Connector
J4 - J7 SMA Connector
TP1 - TP5 DC Pin
C1 - C2 100 nF Capacitor, 0402 Pkg.
C3, C5, C6, C8, C10, C12 100 nF Capacitor, 0402 Pkg.
C4, C7, C9, C11, C13 1 nF Capacitor, 0402 Pkg.
C14 - C16 4.7 µF Capacitor, Tantalum
R1 - R2 4.75 kOhm Resistor, 0402 Pkg.
R3 - R4 0 Ohm Resistor, 0402 Pkg.
R5 1.82K Ohm Resistor, 0402 Pkg.
R6 390 Ohm Resistor, 0402 Pkg.
D1 LED
Q1 PNP Transistor
Item Description
U1 HMC914LP4E Limiting Amplier
PCB [2] 128913 Evaluation PCB
[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 fo@hittite.com
limiting amplifiers - smt
10
Application Circuit
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
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 fo@hittite.com
limiting amplifiers - smt
11
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Application Information
Loss of Signal and Setting the Input Signal Threshold
The HMC914LP4E features an input signal level monitoring over a broad range. En external resistor is used at LOSTH
pin to program the input signal amplitude threshold for generating the LOS output indicator. When this pin is kept
oating LOSTH level is set internally to single-ended 63 mVp-p.
LOS is an open collector output suitable for wired-OR connection for parallel alarm signals; it requires an external
pull-up resistor, RLOS. If the input signal level drops below the asserted threshold level then, LOS output DC voltage
goes low. It goes high only when the input level exceeds the upper hysteresis threshold level. When LOSTH pin is
oating then the de-assert level will be single-ended 110 mVp-p. If this function is not required, the LOS output can
be left oating.
If input threshold value is desired to be higher than 63 mVp-p then an external RTH resistor should be connected
between LOSTH pin and VCC. Desired threshold value can be obtained by changing the value of the resistor RTH as
shown in the gures below.
LOS Assert/Deassert Voltage vs. Rth LOS Hysteresis vs. Rth
0
100
200
300
400
0 100 200 300 400 500
LOS assert
LOS deassert
RESISTOR (kOhm)
SINGLE-ENDED Vin (mVp-p)
0
1
2
3
4
5
0 100 200 300 400 500
Hysteresis = 20*log{LOS deassert/LOS assert}
RESISTOR (kOhm)
SINGLE-ENDED Vin (mVp-p)
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 fo@hittite.com
limiting amplifiers - smt
12
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
If input threshold value is desired to be lower than 63 mV down to 20 mVp-p then an external RTH resistor should
be connected between LOSTH pin and GND. Desired threshold value can be obtained by changing the value of the
resistor value as shown in the gures below.
LOS Assert/Deassert Voltage vs. Rth LOS Hysteresis vs. Rth
0
20
40
60
80
100
120
0 100 200 300 400 500
LOS assert
LOS deassert
RESISTOR (kOhm)
SINGLE-ENDED Vin (mVp-p)
0
5
10
15
0 100 200 300 400 500
Hysteresis = 20*log{LOS deassert/LOS assert}
RESISTOR (kOhm)
SINGLE-ENDED Vin (mVp-p)
Automatic Output Disable
The HMC914LP4E has two different disable features; one is manual and other is automatic.
DISABLE pin provides manual control over the output. DISABLE pin is a CMOS input and active “low”. There is an
integrated pull-up resistor to VCC at this input. If a low level voltage is applied to this input, differential data outputs QP
/ QN are forced to VCC and Disabled . If this input is left oating or logic high is applied then data outputs are enabled.
Disable supply current when DISABLE=0 is 32mA.
Automatic disable mode is activated by AODWNENB CMOS input. This input is active low. To activate the automatic
output disable mode logic, a low level voltage should be applied. When this mode is activated, if the input signal is
lower than the programmed loss threshold, differential outputs automatically get set to VCC and are disabled. Outputs
start toggling for normal operation when the input signal returns to its desired swing level. Disable supply current when
AODWNENB =0 is 40mA.
