AD53508 Datasheet, PDF (1/8 Pages) Analog Devices – PPMU Circuit

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PPMU Circuit
AD53508
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.
FUNCTIONAL BLOCK DIAGRAM
DAC1
DAC2
DSR
MEAS OUT
SENSE
S8
AD53508
S9
S6
S7
ENABLE
+2.5V
S2
OUTPUT
S1
S3
VF
IF
VM
IM
EXT RC
40pF
MAIN
S4
S5
1.25R
DIFF
R
C1
S10
INT/IM _S11
INTEGRATE _R1
S12
S13
1k⍀ _R2
S14
2mA
S15
10k⍀
S16
200␮A UNITY
CON
R
1.25R
GUARD
S18
SENSE
FORCE
S17
GUARD
REV. 0
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© Analog Devices, Inc., 1999