MAX3761E/D Maxim Integrated, MAX3761E/D Datasheet

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MAX3761E/D

Manufacturer Part Number
MAX3761E/D
Description
Limiting Amplifiers Low Power 622Mbps Limiting Amplifiers with Chatter Free Power Detect for LANs
Manufacturer
Maxim Integrated
Datasheet

Specifications of MAX3761E/D

Operating Supply Voltage
5 V
Supply Current
25 mA
Operating Temperature Range
+ 85 C
Available Set Gain
12.5 dB
Number Of Channels
1
Power Dissipation
591 mW
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.
19-1097; Rev 4; 8/08
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.
________________________Applications
__________________Pin Configuration
_______________General Description
TOP VIEW
622Mbps LAN/ATM LAN Receivers
155Mbps LAN/ATM LAN Receivers
FILTER
RSSI
VIN+
GND
VIN-
SUB
CZN
CZP
V
EN
CC
________________________________________________________________ Maxim Integrated Products
10
1
2
3
4
5
6
7
9
8
with Chatter-Free Power Detect for LANs
MAX3761
MAX3762
Low-Power, 622Mbps Limiting Amplifiers
QSOP
17
14
13
12
20
19
18
16
15
11
DISABLE
LOS+
LOS-
V
VCCO
OUT+
OUT-
GNDO
VTH
INV
CC
♦ ♦ Chatter-Free Power Detector with Programmable
♦ ♦ 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
* Dice are designed to operate from -40°C to +85°C, but are
tested and guaranteed only at T
+ Denotes a lead-free/RoHS-compliant package.
____________________________Features
_________Typical Operating Circuits
MAX3761EEP+
MAX3761E/D
MAX3762EEP+
MAX3762E/D
MAX3762 at end of data sheet.
BYPASS
SUPPLY
Loss-of-Signal Outputs
100pF
+5V
PART
100pF
+V
CC
5.6nF
5.6nF
C
100kΩ
10nF
C
C
FILTER
IN
IN
R1
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
RSSI
FILTER
V
EN
VCCO
VIN+
VIN-
INV
CC
MAX3761
A
22kΩ
R2
= +25°C.
CZP
DISABLE
VTH
GNDO
LOS-
OUT-
OUT+
LOS+
GND
CZN
SUB
20 QSOP
Dice*
20 QSOP
Dice*
PIN-PACKAGE
50Ω
C
150pF
AZ
V
CC
50Ω
- 2V
1

Related parts for MAX3761E/D

MAX3761E/D Summary of contents

Page 1

... Low 15ps Pulse-Width Distortion ♦ ♦ TTL Loss-of-Signal Interface Logic—MAX3761 ♦ ♦ PECL Loss-of-Signal Interface Logic—MAX3762 PART MAX3761EEP+ MAX3761E/D MAX3762EEP+ MAX3762E/D * Dice are designed to operate from -40°C to +85°C, but are tested and guaranteed only Denotes a lead-free/RoHS-compliant package ...

Page 2

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs ABSOLUTE MAXIMUM RATINGS V , VCCO............................................................-0.5V to +7.0V CC FILTER, RSSI, EN, VIN+, VIN-, CZP, CZN, DISABLE, LOS+, LOS-, INV, VTH...............-0. PECL Output Current (OUT+, OUT-, LOS+, LOS-) ............50mA Continuous Power Dissipation (T = +85°C) A QSOP (derate 9.1mW/°C above +85°C) .......................591mW Stresses beyond those listed under “ ...

Page 3

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs AC ELECTRICAL CHARACTERISTICS (V = +4.5V to +5.5V, PECL outputs terminated with 50Ω noted. Typical values are +5.0V PARAMETER Minimum LOS Assert Input Data-Output Edge Speed Data-Output Overshoot Pulse-Width Distortion Input Resistance LOS Hysteresis Note 5: AC parameters are guaranteed by design and characterization ...

Page 4

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs ____________________________Typical Operating Characteristics (continued) (MAX3761/MAX3762 EV kit +5.0V, PECL outputs terminated with 50Ω unless otherwise noted.) RSSI vs. TEMPERATURE 23 (622Mbps PRBS) 2.00 1. 50mVp-p IN 1.84 1.76 1. 16mVp-p IN 1.60 1.52 1. 4mVp-p IN 1.36 1.28 1.20 -40 - AMBIENT TEMPERATURE (°C) ...

Page 5

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs ____________________________Typical Operating Characteristics (continued) (MAX3761/MAX3762 EV kit +5.0V, PECL outputs terminated with 50Ω unless otherwise noted.) DATA OUTPUT SINGLE-ENDED PRBS PATTERN) INPUT = 2Vp +85°C A 50mV/ div 500ps/div ______________________________________________________________Pin Description PIN ...

Page 6

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs V GND CC LIMITER VIN+/VIN FWD FWD FILTER C FILTER V CC FWD = FULL-WAVE DETECTOR Figure 1. Functional Diagram _______________Detailed Description Figure 1 shows the functional diagram for the MAX3761/ MAX3762. The input signal is applied to VIN+ and VIN-. ...

Page 7

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs Loss-of-Signal Indicator The MAX3761/MAX3762 includes a loss-of-signal moni- tor with a programmable assert threshold and a hys- teresis comparator. Internally, one comparator input is tied to the RSSI output signal and the other is tied to the threshold-voltage (VTH) pin, which provides a threshold for the LOS indication ...

Page 8

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs Capacitor Selection A typical MAX3761/MAX3762 implementation requires four external capacitors. To select the capacitors, first determine the following parameters in the receiver sys- tem (see the Applications Information section for rec- ommendations in 622Mbps ATM and Fibre Channel ...

Page 9

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs __________Applications Information Converting Average Optical Power to Signal Amplitude Many of the MAX3761/MAX3762’s specifications relate to input-signal amplitude. When working with fiber optic receivers, the input is usually expressed in terms of average optical power and extinction ratio. The rela- ...

Page 10

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs For LOS assert at -35dBm, select R1 = 100kΩ and R2 = 22kΩ, which programs the LOS assert at input ≅ 3mV. With this selection, LOS assert time will typically be less than 85μs. Fibre Channel Component Selection In Fibre Channel applications, the desired LOS assert time is typically 25μ ...

Page 11

... Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs _____________________________________Typical Operating Circuits (continued) +5V 100pF 100pF Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE 20 QSOP E20+1 ______________________________________________________________________________________ CZP V CC CZN EN 10nF ...

Page 12

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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