HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Typical Applications
Features
The HMC914LP4E is ideal for:
Supports Data Rates up to 12.5 Gbps
•• SONET/SDH-Based Transmission Systems
Differential Small Signal Gain: 32 dB
•• OC-192 Fiber Optic Modules
Programmable Loss-of-Signal Detection (LOS)
•• 10 Gigabit Ethernet
Automatic Output Disable Mode
•• 8x and 10x Fiber Channel
Adjustable Output Voltage Swing
up to 750 mVp-p Differential
•• Wideband RF Gain Block
Integrated DC Offset Correction
Received Signal Strength Indicator (RSSI) Output
24 Lead Plastic 4x4mm SMT Package: 16mm²
General Description
Functional Diagram
limiting amplifiers - smt
HMC914LP4E is a limiting amplifier designed to
support data transmission rates up to 12.5 Gbps.
The amplifier 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.
Electrical Specifications, TA = +25° C, Vcc = +3.3V
Parameter
Conditions
Power Supply Voltage, Vcc
Supply Current, Icc
Low Frequency Cut-off, f3dB-L
1
Max.
Units
3.3
3.6
V
47
0.4
VAC = 1V
Maximum Data Rate
Small Signal Bandwidth, f3dB-H
Typ.
3
VAC = 1V
Output Amplitude Control Voltage, VAC
Differential Small Signal Gain
Min.
mA
2.2
32
12.5
V
dB
Gbps
3-dB cutoff frequency
9.5
GHz
100 nF off chip cap is used
10
kHz
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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and to
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and
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01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Electrical Specifications (Continued)
Parameter
Min.
Up to 12 GHz
12
Output return loss, S22
Up to 12 GHz
11
Typ.
Max.
Units
dB
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
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]
Input referred voltage noise
dBm
VAC = 1V
0.3
ps
@ 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]
LOS Assert/Deassert Threshold Level
LOS Hysteresis [5][6]
[5]
RTH = 80 kOhm between LOSTH and
GND, Single-Ended
20
mV
RTH = 8.5 kOhm between LOSTH and
VCC, Single-Ended
380
mV
assert, LOSTH internally
set, single-ended
63
mV
deassert, LOSTH internally
set, single-ended
110
mV
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
V
LOS Output HIGH Voltage
1.82 kOhm to VCC (RLOS)
3.3
LOS Output LOW Voltage
1.82 kOhm to VCC (RLOS)
2.65
V
2.7
mV/V
RSSI Sensitivity
[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)
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
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delivery
and
to place
orders:
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01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
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limiting amplifiers - smt
Conditions
Input return loss, S11
2
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Differential Gain & Return Loss
vs. Frequency [1] [2]
Differential Gain vs. Frequency
& Temperature [1] [2]
50
40
30
40
30
10
GAIN (dB)
RESPONSE (dB)
20
S21
S11
S22
0
-10
20
10
+25C
+85C
-40C
-20
0
-30
-40
0
2
4
6
8
10
-10
12
0
2
4
DIFFERENTIAL VOLTAGE (mVp-p)
DC CURRENT (mA)
10
12
600
50
+25C
+85C
-40C
40
3
3.1
3.2
3.3
3.4
3.5
550
500
450
350
3.6
+25C
+85C
-40C
400
3
3.1
3.2
SUPPLY VOLTAGE Vcc (V)
3.3
3.4
3.5
3.6
SUPPLY VOLTAGE Vcc (V)
DC Current vs. VAC [2] [3]
Differential Output Swing vs. VAC [2] [3]
800
DIFFERENTIAL VOLTAGE (mVp-p)
70
60
50
+25C
+85C
-40C
40
30
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
CONTROL VOLTAGE VAC (V)
[1] VAC = 1V
3
8
Differential Output Swing vs.
Supply Voltage [1] [3]
[1] [3]
60
30
6
FREQUENCY (GHz)
DC Current vs. Supply Voltage
DC CURRENT (mA)
limiting amplifiers - smt
FREQUENCY (GHz)
[2] VCC=3.3V
2
2.2
600
400
+25C
+85C
-40C
200
0
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
2.2
CONTROL VOLTAGE VAC (V)
[3] Input Data: Differential 200 mVp-p 10 Gbps NRZ PRBS 223 -1 pattern
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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delivery,
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place Chelmsford,
orders: Analog MA
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and
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01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Fall Time vs. VAC [1] [2]
50
50
40
40
FALL TIME (ps)
30
+25C
+85C
-40C
20
10
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
30
+25C
+85C
-40C
20
2
10
0.4
2.2
0.6
0.8
CONTROL VOLTAGE VAC (V)
RMS Jitter vs. VAC
1.2
1.4
1.6
1.8
2
2.2
RMS Jitter vs. Single-Ended
Input Voltage [1] [4] [5]
[1] [3]
0.5
4
0.4
+25C
+85C
-40C
3
RMS JITTER (ps)
RMS JITTER (ps)
1
CONTROL VOLTAGE VAC (V)
0.3
0.2
+25C
+85C
-40C
0.1
0
0.4
0.6
0.8
1
1.2
1.4
2
1
1.6
1.8
2
0
2.2
1
10
100
SINGLE-ENDED Vin (mVp-p)
CONTROL VOLTAGE VAC (V)
Differential Output Swing vs.
Single-Ended Input Voltage [1] [4] [5]
1000
RSSI Voltage vs. Single-Ended
Input Voltage [1] [4] [5]
2.5
DIFFERENTIAL VOLTAGE (mVp-p)
1000
limiting amplifiers - smt
RISE TIME (ps)
Rise Time vs. VAC [1] [2]
RSSI (V)
2
100
1
10
100
SINGLE-ENDED Vin (mVp-p)
+25C
+85C
-40C
1.5
+25C
+85C
-40C
1000
1
0
100
200
300
400
SINGLE-ENDED Vin (mVp-p)
500
[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
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
4
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
limiting amplifiers - smt
Absolute Maximum Ratings
5
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
11.25 Gbps Differential Output Eye Diagram
for 200 mVp-p Input
Current
Minimum
Maximum
10 Gbps Differential Output Eye Diagram
for 10 mVp-p Input
Total Meas
Current
Minimum
Maximum
Total Meas
Eye Amp
481 mV
481 mV
482 mV
83
Eye Amp
358 mV
358 mV
358 mV
81
Rise Time
30.00 ps
30.00 ps
31.33 ps
83
Rise Time
36.00 ps
36.00 ps
37.33 ps
81
Fall Time
28.67 ps
28.67 ps
29.33 ps
83
Fall Time
35.33 ps
34.67 ps
36.00 ps
81
p-p Jitter
9.333 ps
6.667 ps
9.333 ps
83
p-p Jitter
15.333 ps
12.000 ps
15.333 ps
81
Time Scale: 30 ps/div
Amplitude Scale: 100 mV/div
Time Scale: 30 ps/div
Amplitude Scale: 90 mV/div
Test Conditions:
VCC = 3.3V, VAC = 1V
Data Input:
Differential 200 mVp-p 11.25 Gbps NRZ PRBS 223 -1 pattern
Test Conditions:
VCC = 3.3V, VAC = 1V
Data Input: Differential 10 mVp-p 10 Gbps NRZ PRBS 223 -1 pattern
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2
delivery,
and to
place Chelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
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.
Package Information
Part Number
Package Body Material
Lead Finish
HMC914LP4E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
MSL Rating
MSL1
[2]
Package Marking [1]
H914
XXXX
limiting amplifiers - smt
Outline Drawing
[1] 4-Digit lot number XXXX
[2] Max peak reflow temperature of 260 °C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
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delivery
and
to place
orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
6
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
limiting amplifiers - smt
Pin Descriptions
7
Pin Number
Function
Description
1
LOS
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.
6
DISABLE
Disables output buffer. Internally set to VCC. Data outputs
are enabled when DISABLE is high or floating.
7
AODWNENB
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.
Interface Schematic
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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delivery,
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01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
Pin Descriptions (Continued)
Function
Description
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.
Interface Schematic
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
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license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
limiting amplifiers - smt
Pin Number
8
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
limiting amplifiers - smt
Evaluation PCB
9
List of Materials for Evaluation PCB 128915 [1]
Item
Description
Item
J1 - J3
4 Pin DC Connector
U1
Description
HMC914LP4E Limiting Amplifier
J4 - J7
SMA Connector
PCB [2]
128913 Evaluation PCB
TP1 - TP5
DC Pin
[1] Reference this number when ordering complete evaluation PCB
C1 - C2
100 nF Capacitor, 0402 Pkg.
[2] Circuit Board Material: Arlon 25FR or Rogers 4350
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
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 Hittite upon request.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2
delivery,
and to
place Chelmsford,
orders: Analog MA
Devices,
Inc.,
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delivery
and
to place
orders:
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Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
limiting amplifiers - smt
Application Circuit
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
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orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
10
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
floating 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
floating then the de-assert level will be single-ended 110 mVp-p. If this function is not required, the LOS output can
be left floating.
LOS Assert/Deassert Voltage vs. Rth
5
SINGLE-ENDED Vin (mVp-p)
LOS assert
LOS deassert
300
200
100
0
11
LOS Hysteresis vs. Rth
400
SINGLE-ENDED Vin (mVp-p)
limiting amplifiers - smt
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 figures below.
0
100
200
300
RESISTOR (kOhm)
400
500
4
3
2
1
0
Hysteresis = 20*log{LOS deassert/LOS assert}
0
100
200
300
RESISTOR (kOhm)
400
500
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2
delivery,
and to
place Chelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
HMC914LP4E
v03.1012
12.5 Gbps LIMITING AMPLIFIER
w/ LOSS OF SIGNAL FEATURE
LOS Assert/Deassert Voltage vs. Rth
LOS Hysteresis vs. Rth
15
100
SINGLE-ENDED Vin (mVp-p)
SINGLE-ENDED Vin (mVp-p)
120
80
LOS assert
LOS deassert
60
40
20
10
5
Hysteresis = 20*log{LOS deassert/LOS assert}
0
0
0
100
200
300
RESISTOR (kOhm)
400
500
0
100
200
300
RESISTOR (kOhm)
400
500
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 floating or logic high is applied then data outputs are enabled.
Disable supply current when DISABLE=0 is 32mA.
limiting amplifiers - smt
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 figures below.
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.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
For price, 2delivery,
and to
placeChelmsford,
orders: Analog MA
Devices,
Inc.,
For price,
delivery
and
to place
orders:
Microwave
Corporation,
Elizabeth
Drive,
01824
responsibility
is assumed
by Analog
Devices
for its use,
nor for anyHittite
infringements
of patents or other
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106
rights of third parties that may result from its use. Specifications subject to change without notice. No
Phone: 978-250-3343
Fax: 978-250-3373 Phone:
Order781-329-4700
On-line at www.hittite.com
• Order online at www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Application
Phone: 1-800-ANALOG-D
Trademarks and registered trademarks are the
property of their respective
owners.
Application
Support:
Phone: 978-250-3343
or Support:
fo@hittite.com
12
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