a
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: 鈥? V to +9 V
Power Supplies: +15 V, +5 V, and 鈥?0 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
PPMU Circuit
AD53508
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 鈥?0 V supplies and
dissipates 230 mW nominally.
Recommended Use of the PPMU with AD53032 DCL
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 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 bene鏗乼s including:
1. Accurately measuring low currents.
2. Can take parallel measurements by using one PMU per pin.
FUNCTIONAL BLOCK DIAGRAM
S8
S9
EXT RC
MAIN
S10
VF
IF
DSR
+2.5V
S2
OUTPUT
S1
MEAS OUT
CON
1.25R
R
GUARD
S18
GUARD
S3
VM
IM
S4
S5
1.25R
DIFF
R
INTEGRATE
1k
2mA
10k
200 A
40pF
C1
R1
R2
INT/IM
SENSE
AD53508
DAC1
DAC2
S6
S7
ENABLE
SENSE
S11
S12
S13
S14
S15
S16
S17
FORCE
UNITY
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.
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
漏 Analog Devices, Inc., 1999
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