Datasheet

MAX3761/MAX3762
Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
_______________________________________________________________________________________ 5
____________________________Typical Operating Characteristics (continued)
(MAX3761/MAX3762 EV kit, V
CC
= +5.0V, PECL outputs terminated with 50Ω to V
CC
- 2V, input is a 1-0 pattern, 622Mbps, T
A
= +25°C,
unless otherwise noted.)
______________________________________________________________Pin Description
NAME FUNCTION
1 FILTER Sets the integration frequency of the power detector. Impedance at this node is approximately 500Ω.
2 RSSI Received-Signal-Strength Indicator. An analog DC voltage representing the input power.
PIN
3 EN Connect to V
CC
.
4, 17 V
CC
+5V Power Supply
5 VIN+ Positive Input Data
6 VIN- Negative Input Data
7 GND Supply Ground
8 SUB Substrate. Connect to ground.
9 CZP Sets input offset correction, low-frequency cutoff.
10 CZN Sets input offset correction, low-frequency cutoff.
11 INV Negative Input to Op Amp. Used for programming the loss-of-signal threshold.
12 VTH Loss-of-Signal Threshold Voltage
13 GNDO Ground Power Supply for Output Buffers
14 OUT- Negative PECL Data Output
15 OUT+ Positive PECL Data Output
16 VCCO +5V Power Supply for Output Buffers
18 LOS- Negative Loss-of-Power Flag, TTL (MAX3761) or PECL (MAX3762)
19 LOS+ Positive Loss-of-Power Flag, TTL (MAX3761) or PECL (MAX3762)
20 DISABLE Disables the data outputs when high. TTL (MAX3761) or PECL (MAX3762).
50mV/
div
500ps/div
DATA OUTPUT SINGLE-ENDED
(2
23
-1 PRBS PATTERN)
MAX3761/62-13
INPUT = 2Vp-p
T
A
= +85°C
200mV/
div
200ps/div
RANDOM JITTER
MAX3761/62-14
DIFFERENTIAL OUTPUT
(OUT+ - OUT-)
INPUT = 16mVp-p
T
A
= +27°C
1-0 PATTERN 622Mbps
10
4
10
5
10
6
10
3
FREQUENCY ON POWER SUPPLY (Hz)
RANDOM JITTER (ps rms)
10
8
4
2
6
RANDOM JITTER vs.
POWER-SUPPLY NOISE FREQUENCY
MAX3761/62-15
DIFFERENTIAL OUTPUT RANDOM JITTER
DATA INPUT AMPLITUDE = 16mVp-p
INPUT AMPLITUDE
POWER SUPPLY = 100mVp-p