REV. A
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a
AD53508
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2001
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⍀
200A
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
ⴞ204.8 A and ⴞ 2.048 mA
Five Current Measurement Ranges
204.8 nA to ⴞ2.048 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.
