REV. 0

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a

AD53032

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 1998

High Performance Driver/Comparator

Active Load on a Single Chip

FUNCTIONAL BLOCK DIAGRAM

DRIVER

COMPARATOR

50

V/I

V/I

ACTIVE LOAD

1.0 A/K

34

51

52

39

40

41

32

AD53032

VHDCPL

VLDCPL

39nF

CHDCPL

39nF

CLDCPL

2,5,8

9,33,44,46,48

PWRGND

ECLGND

HQGND2

HQGND

VCOMS

IOL

IOH

THERM

NC

35

36

+1

31

50

49

42

43

38

37

45

47

VH

VTERM

DATA

DATA

IOD

IOD

RLD

RLD

HCOMP

LEH

LEH

QH

QHB

QL

QL

LEL

LEL

LCOMP

VCOMI

IOLC

IOLRTN

IOHRTN

INHL

INHL

IOHC

NC = NO CONNECT

FEATURES

250 MHz Operation

Driver/Comparator and Active Load Included

On-Chip Schottky Diode Bridge

52-Lead LQFP Package with Built-in Heatsink

APPLICATIONS

Automatic Test Equipment

Semiconductor Test Systems

Board Test Systems

Instrumentation and Characterization Equipment

PRODUCT DESCRIPTION

The AD53032 is a single chip that performs the pin electronics

functions of driver, comparator and active load in ATE VLSI

and memory testers. In addition, a Schottky diode bridge for the

active load and a VCOM buffer are included internally.

The driver is a proprietary design that features three active

states: Data High Mode, Data Low Mode and Term Mode as

well as an Inhibit State. This facilitates the implementation of

high speed active termination. The output voltage range is –3 V

to +8 V to accommodate a wide variety of test devices. The

output leakage is typically less than 250 nA over the entire sig-

nal range.

The dual comparator, with an input range equal to the driver

output range, features built-in latches and ECL-compatible

outputs. The outputs are capable of driving 50

Ω signal lines

terminated to –2 V. Signal tracking capability is upwards of

5 V/ns.

The active load can be set for up to 35 mA load current with

less than a 10

µA linearity error through the entire set range.

Onboard Schottky diodes provide high speed switching and low

capacitance.

Also included on the chip is an onboard temperature sensor

whose purpose is to give an indication of the surface tempera-

ture of the DCL. This information can be used to measure

θ

JC

and

θ

the sensor is a current sink that is proportional to absolute tem-

perature. The gain is trimmed to a nominal value of 1.0

µA/K.

As an example, the output current can be sensed by using a

10 k

Ω resistor connected from +10 V to the THERM (IOUT) pin.

A voltage drop across the resistor will be developed that equals:

10K

× 1 µA/K = 10 mV/K = 2.98 V at room temperature.