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19-1097; Rev 4; 8/08
EVAALVUAAILTAIOBNLEKIT
Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
_______________General Description
The MAX3761/MAX3762 limiting amplifiers, with 4mV
sensitivity and PECL data outputs, are optimized for
operation in low-cost, 622Mbps, LAN/ATM LAN fiber
optics applications.
An integrated power detector senses the input signal’s
amplitude. A received-signal-strength indicator (RSSI)
gives an analog indication of the power level, while the
complementary loss-of-signal (LOS) outputs indicate if
the input power level exceeds the programmed
threshold level. The LOS threshold can be adjusted to
detect signal amplitudes between 3mVp-p and
100mVp-p, providing a 15dB LOS adjustment in fiber
optic receivers. The LOS outputs have 3.5dB of
hysteresis, which prevents chatter when input signal
levels are small. The MAX3761’s LOS outputs are com-
patible with TTL-logic levels. The MAX3762 has PECL
LOS outputs.
DISABLE and LOS can be used to implement a squelch
function, which turns off the data outputs when the
input signal is below the programmed threshold.
________________________Applications
622Mbps LAN/ATM LAN Receivers
155Mbps LAN/ATM LAN Receivers
____________________________Features
Chatter-Free Power Detector with Programmable
Loss-of-Signal Outputs
4mV Input Sensitivity
PECL Data Outputs
Single 5V Power Supply
250ps Output Edge Speed
Low 15ps Pulse-Width Distortion
TTL Loss-of-Signal Interface Logic—MAX3761
PECL Loss-of-Signal Interface Logic—MAX3762
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3761EEP+
-40°C to +85°C 20 QSOP
MAX3761E/D
-40°C to +85°C Dice*
MAX3762EEP+
-40°C to +85°C 20 QSOP
MAX3762E/D
-40°C to +85°C Dice*
*Dice are designed to operate from -40°C to +85°C, but are
tested and guaranteed only at TA = +25°C.
+Denotes a lead-free/RoHS-compliant package.
__________________Pin Configuration _________Typical Operating Circuits
TOP VIEW
FILTER 1
RSSI 2
EN 3
VCC 4
VIN+ 5
VIN- 6
GND 7
SUB 8
CZP 9
CZN 10
MAX3761
MAX3762
20 DISABLE
19 LOS+
18 LOS-
17 VCC
16 VCCO
15 OUT+
14 OUT-
13 GNDO
12 VTH
11 INV
QSOP
+5V
100pF
BYPASS
SUPPLY
10nF
CIN
5.6nF
CIN
5.6nF
100pF
CFILTER
+VCC
VCC
EN
RSSI
VCCO
VIN+
CZP
CZN
DISABLE
LOS+
LOS-
OUT-
OUT+
MAX3761
VIN- GNDO
FILTER
GND
INV VTHSUB
CAZ
150pF
50Ω
50Ω
VCC - 2V
R1
100kΩ
R2
22kΩ
MAX3762 at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
ABSOLUTE MAXIMUM RATINGS
VCC, VCCO............................................................-0.5V to +7.0V
FILTER, RSSI, EN, VIN+, VIN-, CZP, CZN,
DISABLE, LOS+, LOS-, INV, VTH...............-0.5V to (VCC + 0.5V)
PECL Output Current (OUT+, OUT-, LOS+, LOS-) ............50mA
Continuous Power Dissipation (TA = +85°C)
QSOP (derate 9.1mW/°C above +85°C) .......................591mW
Operating Junction Temperature Range ...........-40°C to +150°C
Processing Temperature (die) .........................................+400°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, DISABLE = low, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5.0V, TA = +25°C.)
(Note 1)
PARAMETER
Power-Supply Current
LOS Output TTL High
LOS Output TTL Low
LOS Output PECL High
LOS Output PECL Low
DISABLE Input Current
DISABLE Input High
DISABLE Input Low
DISABLE Input PECL High
DISABLE Input PECL Low
PECL Data Output Voltage High (VOH)
PECL Data Output Voltage Low (VOL)
Disabled Differential Output
Disabled Common-Mode Output
CONDITIONS
MAX3761, IVCC
MAX3762, IVCC
MAX3761
MAX3761 (TA = +25°C to +85°C)
(TA = -40°C to +25°C)
MAX3762 (Notes 2, 3)
MAX3762 (Notes 2, 3)
Logic high
MAX3761
MAX3761
MAX3762 (Note 3)
MAX3762 (Note 3)
(Notes 2, 3)
(Notes 2, 3)
DISABLE = high
DISABLE = high
MIN TYP
25
30
2.8
-1150
-1830
2.65
-1160
-1150
-1830
-100
VCC - 0.7
MAX
37
46
0.40
0.44
-880
-1555
100
0.8
-1470
-880
-1555
100
VCC -1.2
UNITS
mA
V
V
mV
mV
μA
V
V
mV
mV
mV
mV
mV
V
Note 1: Dice are tested at TA = +25°C.
Note 2: Outputs terminated with 50Ω to VCC - 2V.
Note 3: Voltage measurements are relative to VCC.
2 _______________________________________________________________________________________

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Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
AC ELECTRICAL CHARACTERISTICS
(VCC = +4.5V to +5.5V, PECL outputs terminated with 50Ω to VCC - 2V, input 4mV to 2Vp-p, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at VCC = +5.0V, TA = +25°C.) (Note 5)
PARAMETER
Minimum LOS Assert Input
Data-Output Edge Speed
Data-Output Overshoot
Pulse-Width Distortion
Input Resistance
LOS Hysteresis
CONDITIONS
TA = -40°C, 223 - 1 PRBS
20% to 80%
(Note 6)
(Notes 6, 7)
Differential
223 - 1 PRBS, VTH = 1.8V
MIN TYP MAX UNITS
15
3900
3.5
3.2
250
20
80
mV
ps
%
ps
Ω
dB
Note 5: AC parameters are guaranteed by design and characterization.
Note 6: Input signal is a 1-0 pattern, 622Mbps.
Note 7: PWD = [(width of wider pulse) - (width of narrower pulse)] / 2.
__________________________________________Typical Operating Characteristics
(MAX3761/MAX3762 EV kit, VCC = +5.0V, PECL outputs terminated with 50Ω to VCC - 2V, input is a 1-0 pattern, 622Mbps, TA = +25°C,
unless otherwise noted.)
MAX3762
SUPPLY CURRENT vs. TEMPERATURE
50
45
VCC = 5.5V
40
35
30
25
VCC = 5.0V
20
VCC = 4.5V
15
10
-40
-15 10 35 60
AMBIENT TEMPERATURE (°C)
85
2.40
2.28
2.16
2.04
1.92
1.80
1.68
1.56
1.44
1.32
1.20
1
RSSI vs. INPUT AMPLITUDE
AND DATA PATTERN
223 - 1
PRBS PATTERN
1-0 PATTERN
10 100
INPUT SIGNAL (mVp-p)
1000
RSSI vs.
INPUT POWER AND FREQUENCY
2.40
2.28
10MHz
2.16
2.04
1.92
1.80
1.68
1.56
500MHz
1.44
1.32
1.20
-50 -45 -40 -35 -30 -25 -20 -15 -10 -5 0
INPUT POWER (dBm)
_______________________________________________________________________________________ 3

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Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
____________________________Typical Operating Characteristics (continued)
(MAX3761/MAX3762 EV kit, VCC = +5.0V, PECL outputs terminated with 50Ω to VCC - 2V, input is a 1-0 pattern, 622Mbps, TA = +25°C,
unless otherwise noted.)
2.00
1.92
1.84
1.76
1.68
1.60
1.52
1.44
1.36
1.28
1.20
-40
RSSI vs. TEMPERATURE
(622Mbps 223 - 1 PRBS)
VIN = 50mVp-p
VIN = 16mVp-p
VIN = 4mVp-p
-20 0 20 40 60
AMBIENT TEMPERATURE (°C)
80
DATA OUTPUT LEVELS
(REFERENCE TO VCC)
-0.8
VOH
-1.0
-1.2
-1.4
-1.6
VOL
-1.8
-40
-20 0 20 40 60
AMBIENT TEMPERATURE (°C)
80
LOS OPERATION
WITH SQUELCHING
OUT+
LOS HYSTERESIS vs. TEMPERATURE
(622Mbps 223 - 1 PRBS PATTERN)
4.00
3.75
ASSERT LEVEL SET
TO APPROXIMATELY
2mVp-p
3.50
3.25
3.00
2.75
2.50
-40
ASSERT LEVEL SET
TO APPROXIMATELY 30mVp-p
-20 0 20 40 60 80
AMBIENT TEMPERATURE (°C)
100
1400
1280
1160
1040
920
800
680
560
440
320
200
0.1m
DIFFERENTIAL OUTPUT
vs. INPUT AMPLITUDE
1m 0.01 0.1
1
INPUT SIGNAL (Vp-p)
10
LOS OPERATION
WITHOUT SQUELCHING
OUT+
LOS HYSTERESIS vs. TEMPERATURE
(622Mbps 1-0 PATTERN)
8
ASSERT LEVEL SET
7
TO APPROXIMATELY
2mVp-p
6
5
ASSERT LEVEL SET
TO APPROXIMATELY
4 30mVp-p
3
-40 -20 0 20 40 60 80
AMBIENT TEMPERATURE (°C)
100
PULSE-WIDTH DISTORTION
(622Mbps DATA RATE)
50
40
-40°C
30
20
10
0
0.001
+85°C
0.01 0.1
1
INPUT SIGNAL (Vp-p)
10
DATA OUTPUT SINGLE-ENDED
(223 - 1 PRBS PATTERN)
INPUT = 4mVp-p
TA = +85°C
100mV/
div
LOS+
DATA IN
100mV/
div
LOS+
DATA IN
50mV/
div
5μs/div
5μs/div
500ps/div
4 _______________________________________________________________________________________

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Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
____________________________Typical Operating Characteristics (continued)
(MAX3761/MAX3762 EV kit, VCC = +5.0V, PECL outputs terminated with 50Ω to VCC - 2V, input is a 1-0 pattern, 622Mbps, TA = +25°C,
unless otherwise noted.)
DATA OUTPUT SINGLE-ENDED
(223-1 PRBS PATTERN)
INPUT = 2Vp-p
TA = +85°C
RANDOM JITTER
DIFFERENTIAL OUTPUT
(OUT+ - OUT-)
INPUT = 16mVp-p
TA = +27°C
1-0 PATTERN 622Mbps
RANDOM JITTER vs.
POWER-SUPPLY NOISE FREQUENCY
10
DIFFERENTIAL OUTPUT RANDOM JITTER
DATA INPUT AMPLITUDE = 16mVp-p
INPUT AMPLITUDE
8 POWER SUPPLY = 100mVp-p
50mV/
div
200mV/
div
6
4
500ps/div
200ps/div
2
103
104 105
FREQUENCY ON POWER SUPPLY (Hz)
106
______________________________________________________________Pin Description
PIN
1
2
3
4, 17
5
6
7
8
9
10
11
12
13
14
15
16
18
19
20
NAME
FILTER
RSSI
EN
VCC
VIN+
VIN-
GND
SUB
CZP
CZN
INV
VTH
GNDO
OUT-
OUT+
VCCO
LOS-
LOS+
DISABLE
FUNCTION
Sets the integration frequency of the power detector. Impedance at this node is approximately 500Ω.
Received-Signal-Strength Indicator. An analog DC voltage representing the input power.
Connect to VCC.
+5V Power Supply
Positive Input Data
Negative Input Data
Supply Ground
Substrate. Connect to ground.
Sets input offset correction, low-frequency cutoff.
Sets input offset correction, low-frequency cutoff.
Negative Input to Op Amp. Used for programming the loss-of-signal threshold.
Loss-of-Signal Threshold Voltage
Ground Power Supply for Output Buffers
Negative PECL Data Output
Positive PECL Data Output
+5V Power Supply for Output Buffers
Negative Loss-of-Power Flag, TTL (MAX3761) or PECL (MAX3762)
Positive Loss-of-Power Flag, TTL (MAX3761) or PECL (MAX3762)
Disables the data outputs when high. TTL (MAX3761) or PECL (MAX3762).
_______________________________________________________________________________________ 5