REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

AD53508

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., 1999

PPMU Circuit

FUNCTIONAL BLOCK DIAGRAM

S11

S12

S13

S14

S15

S16

INT/IM

R1

R2

INTEGRATE

S10

UNITY

DIFF

VF

S4

IF

S5

C1

1k

2mA

10k

200 A

EXT RC

SENSE

S8

S9

S2

S3

VM

IM

ENABLE

S1

CON

+2.5V

S6

S7

DAC1

DAC2

DSR

MEAS OUT

40pF

S17

GUARD

FORCE

SENSE

R

R

1.25R

1.25R

MAIN

GUARD

S18

AD53508

OUTPUT

FEATURES

Dual Measurement Channels

Precision Four-Quadrant-Per-Pin V/I Source

Programmable Current Force Ranges

204.8

A and

2.048 mA

Five Current Measurement Ranges

204.8 nA to

2.048 mA

Output Voltage Range: –4 V to +9 V

Power Supplies: +15 V, +5 V, and –10 V

44-Lead Plastic J-Leaded Chip Carrier Package

APPLICATIONS

Can Be Used with the AD53032 DCL to Extend Current

Force Range to 35 mA

GENERAL DESCRIPTION

The AD53508 is a custom dual-channel parametric measure-

ment circuit for use in semiconductor automatic test equipment.

It contains programmable modes to force a pin voltage and

measure its current or to integrate and hold a current value.

Alternatively, a current can be forced and the compliance volt-

age measured.

The device provides a remote force/sense capability to ensure

accuracy at the tester pin. A guard output is available to drive

the shield of a force/sense pair.

Two input references per channel permit controlled switching to

different voltage or current levels. The forced voltage or current

levels can be switched back to the measurement system to read

back the analog levels for system calibration.

The circuit is powered by +15 V, +5 V and –10 V supplies and

dissipates 230 mW nominally.

Recommended Use of the PPMU with AD53032 DCL

The PPMU can be used with the AD53032 DCL to extend the

Current Force Range beyond 2 mA VCOM can be set to the

maximum spec allowance of 8 V, which would allow the maxi-

mum Current Force of IOL of 35 mA. The combination of the

PPMU and the DCL would have a few benefits including:

1. Accurately measuring low currents.

2. Can take parallel measurements by using one PMU per pin.