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PDF MAX3762 Data sheet ( Hoja de datos )
| Número de pieza | MAX3762 | |
| Descripción | 622Mbps Limiting Amplifiers | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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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.
http://www.Datasheet4U.com
1 page  
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
http://www.Datasheet4U.com
5 Page 
Low-Power, 622Mbps Limiting Amplifiers
with Chatter-Free Power Detect for LANs
_____________________________________Typical Operating Circuits (continued)
+5V CAZ
VCC CZP
150pF
EN CZN
10nF RSSI
DISABLE
LOS+
100pF
CIN
5.6nF
CIN
5.6nF
100pF
CFILTER
VCCO
LOS-
OUT-
VIN+ OUT+
MAX3762
VIN- GNDO
FILTER
INV
GND
VTH SUB
50Ω
500Ω
500Ω
VCC - 2V
50Ω VCC - 2V
VCC - 2V
+VCC
R1 R2
Package Information
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
20 QSOP
E20+1
21-0055
Chip Topography
RSSI FILTER DISABLE LOS+
EN
VCC
VIN+
VIN-
GND
SUB
LOS-
VCC
VCCO 0.063"
(1.60mm)
OUT+
OUT-
GNDO
CZP CZN INV VTH
0.059"
(1.49mm)
TRANSISTOR COUNT: 961
SUBSTRATE CONNECTED TO SUB
______________________________________________________________________________________ 11
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX3762.PDF ] | |
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