ML4622 Micro Linear, ML4622 Datasheet

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ML4622

Manufacturer Part Number
ML4622
Description
Fiber Optic Data Quantizer
Manufacturer
Micro Linear
Datasheet

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GENERAL DESCRIPTION
The ML4622 and ML4624 data quantizers are low noise,
wideband, bipolar monolithic ICs designed specifically for
signal recovery applications in fiberoptic receiver systems.
They contain a wideband limiting amplifier which is
capable of accepting an input signal as low as 2mV
with a 55dB dynamic range. This high level of sensitivity
is achieved by using a DC restoration feedback loop
which nulls any offset voltage produced in the limiting
amplifier.
The output stage is a high speed comparator circuit with
both TTL and ECL outputs. An enable pin is included for
added control.
The Link Detect circuit provides a Link Monitor function
with a user selectable reference voltage. This circuit
monitors the peaks of the input signal and provides a
logic level output indicating when the input falls below
an acceptable level. This output can be used to disable
the quantizer and/or drive an LED, providing a visible link
status.
ML4622/ML4624 BLOCK DIAGRAM
1
V
TH
V
V
V
V
ADJ
IN
IN
REF
DC
+
BIAS
THRESH
REF
GEN
CF1
AMP
CF2
LINK DETECT
P-P
C
TIMER
Fiber Optic Data Quantizer
FEATURES
APPLICATIONS
Data rates up to 40MHz or 80MBd
Can be powered by either +5V providing TTL or raised
ECL level outputs or –5.2V providing ECL levels
Low noise design: 25 V RMS over bandwidth
Adjustable Link Monitor function with hystersis
Wide 55dB input dynamic range
Low power design
ML4624 is pin compatible with the ML4621
IEEE 802.3 10BASE-FL Receiver
IEEE 802.5 fiber optic token ring, 4 and 16mbps
Fiber Optic Data Communications and
Telecommunications Receivers
CMP
ECL
ML4622, ML4624
ECL+
ECL–
*ML4624 ONLY
CMP
TTL
TTL OUT
CMP ENABLE
V
V
GND
GND TTL
TTL LINK MON
CC
CC
January 1997
TTL*

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ML4622 Summary of contents

Page 1

... GENERAL DESCRIPTION The ML4622 and ML4624 data quantizers are low noise, wideband, bipolar monolithic ICs designed specifically for signal recovery applications in fiberoptic receiver systems. They contain a wideband limiting amplifier which is capable of accepting an input signal as low as 2mV with a 55dB dynamic range. This high level of sensitivity ...

Page 2

... ML4622, ML4624 PIN CONNECTIONS ML4622 16-Pin DIP or SOIC (Narrow) TTL LINK MON 1 16 CMP ENABLE GND ADJ IN– REF TIMER CF2 6 11 TTL OUT CF1 7 10 ECL+ GND TTL 8 9 ECL– ...

Page 3

... TTL OUT V DC CF2 CF1 GND REF C TIMER V ML4622, ML4624 FUNCTION TTL The positive supply for the TTL comparator stage. If the TTL output is not necessary, connect (ML4624 only) CC TTL data output. An external capacitor on this pin integrates an error signal which nulls the offset of the input amplifier ...

Page 4

... GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0 TTL – GND TTL . . . . . . . . . . . . . . . . . . . . . . . –0.3 to +7.0 CC Inputs/Outputs GND . . . . . . . . . . . . . . . . . . . –0 Storage Temperature Range . . . . . . . . . . . . . . – +150 C Lead Temperature (Soldering 10 sec +260 C ML4622, ML4624 ELECTRICAL CHARACTERISTICS (Note 2 and 3) Over recommended operating conditions of T industrial temperature range SYMBOL PARAMETER I ...

Page 5

... ML4622, ML4624 ELECTRICAL CHARACTERISTICS (Continued) Over recommended operating conditions of T industrial temperature range SYMBOL PARAMETER V Input Threshold Voltage TH ML4622 ML4624 Hystersis V Common mode voltage CM on VIN+, VIN– ECL Output High Voltage ECL+, ECL– ECL Output Low Voltage at ...

Page 6

... L2 4.7µH Note: If TTL OUT is used, tie GND TTL to unfiltered ground and remove L1. If TTL OUT and ECL outputs are both used, add 3K pulldown resistors at ECL outputs. Figure 1. The ML4622, ML4624 Configured for 20MHz Bandwidth OUT V – OUT (1) The above equation applies when a single capacitor is tied between CF1 and CF2 ...

Page 7

... For these links, a faster response time of the DC loop and the Link Monitor is required. The ML4622 and ML4624 has been designed to accommodate these two requirements. The input coupling capacitors can be relatively small and still maintain stability ...

Page 8

... ML4622, ML4624 ORDERING INFORMATION PART NUMBER ML4622CP ML4622CS ML4622IS ML4624CP ML4624CQ © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described herein may be covered by one or more of the following patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; ...

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