ML4632CS Micro Linear, ML4632CS Datasheet

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ML4632CS

Manufacturer Part Number
ML4632CS
Description
Fiber optic LED quantizer
Manufacturer
Micro Linear
Datasheet

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Part Number:
ML4632CS
Manufacturer:
ML
Quantity:
20 000
GENERAL DESCRIPTION
The ML4632 is a fiber optic LED driver suited for network
applications up to 20Mbps. The part is capable of driving
up to 100mA of current through a Fiber Optic LED from
an ECL or TTL level input signal. Its efficient output stage
provides a high current that can be programmed for
accurate absolute output level as well as automatic
temperature compensation. The combination of automatic
temperature compensation and a highly accurate current
driven design insures precise launch power.
The LED driver’s output stage provides fast, well matched
rise and fall times through a unique class B output stage
that burns supply current only when the LED is on. A
positive temperature coefficient of up to 3300ppm/ C can
be programmed into the output current to compensate for
the negative temperature coefficient of the LED optical
output power. An optional peaking circuit may also be
employed.
The ECL and TTL inputs are ANDed so one can be used
for data and the other for an enable input. An ECL
compatible BIAS voltage is also provided for single ended
ECL applications.
BLOCK DIAGRAM
VBIAS
ECLN
GND
ECLP
V
TTL
CC
14
13
1
2
8
4
+
BUFFER
REF
I
OFF
9
FEATURES
APPLICATIONS
Current Driven Output for accurate Launch Power
Programmable output current from 20mA to 100mA
Programmable temperature coefficient, 0 to 3300ppm/ C
High Efficiency Output Stage
Programmable LED pre-bias current
Low EMI/RFI Noise
ECL or TTL inputs
Optional Peaking circuit
IEEE 802.3, 10BASE-F
IEEE 802.5 Fiber Optic Token Ring
IEEE 802.4 Fiber Optic Token Bus
Fiber Optic Data Communications and
Telecommunications
DRIVER
PTAT
PEAK
AMP
DRV
Fiber Optic LED Driver
11
10
12
7
6
3
5
PEAK
RPK
LED
RTSET
DRV
VREF
PTAT
ML4632
March 1997
1

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ML4632CS Summary of contents

Page 1

GENERAL DESCRIPTION The ML4632 is a fiber optic LED driver suited for network applications up to 20Mbps. The part is capable of driving up to 100mA of current through a Fiber Optic LED from an ECL or TTL level input ...

Page 2

ML4632 PIN CONFIGURATION ML4632 14-Pin PDIP (P14) ECLN 1 14 ECLP VBIAS 2 13 TTL LED 3 12 PTAT GND 4 11 DRV RTSET VREF 5 10 RPK OFF PEAK TOP VIEW PIN DESCRIPTION ...

Page 3

ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied ............................................................................... Input Pin Voltages ............................. –0.3V to ...

Page 4

ML4632 FUNCTIONAL DESCRIPTION The ML4632 accepts ECL and TTL input signals and generates a high speed, high accuracy output current which is independent of supply voltage variations. The output current is programmable from 20mA to 100mA. A temperature coefficient can ...

Page 5

The ML4632 output stage conducts full load current only when the LED is on, and even then power dissipation in the part is low because most of the +5V supply voltage is dropped across the LED and external resistor R ...

Page 6

ML4632 6 ...

Page 7

Package: P14 14-Pin PDIP 0.740 - 0.760 (18.79 - 19.31) 14 PIN 0.070 MIN (1.77 MIN) 0.050 - 0.065 0.100 BSC (4 PLACES) (1.27 - 1.65) (2.54 BSC) 0.170 MAX (4.32 MAX) SEATING PLANE 0.016 - 0.022 ...

Page 8

... ORDERING INFORMATION PART NUMBER ML4632CP ML4632CS © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 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; 5,559,470; 5,565,761; 5,592,128; 5,594,376; Japan: 2598946. Other patents are pending. ...

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