AD53041 Datasheet, PDF (1/4 Pages) Analog Devices – High Speed Active Load with Inhibit Mode

a
High Speed Active Load
with Inhibit Mode
AD53041
FEATURES
؎50 mA Voltage Programmable Current Range
Three Selectable Gain Ranges
1.7 ns Propagation Delay
Inhibit Mode Function
High Speed Differential Inputs for Maximum Flexibility
Ultrasmall 20-Lead PSOP Package with Built-In Heatsink
APPLICATIONS
Automatic Test Equipment
Semiconductor Test Systems
Board Test Systems
FUNCTIONAL BLOCK DIAGRAM
GAINA
GAINB
I_OLPGM
INH
INH
VOLTAGE-TO-CURRENT
CONVERTER
I_OLOUT
I_OLRTN
I_OHRTN
I_OHOUT
PRODUCT DESCRIPTION
The AD53041 is a complete, high speed, current switching load
designed for use in linear, digital or mixed signal test systems.
Combining a high speed monolithic process with a unique sur-
face mount package, this product attains superb electrical per-
formance while preserving optimum packaging densities in an
ultrasmall 20-lead, PSOP package with a built-in heatsink.
Featuring current programmability of up to ± 50 mA, the
AD53041 is designed to force the device under test to source
or sink the programmed I_OH and I_OL currents. I_OH and I_OL
currents are determined by applying a corresponding voltage
(5 V = 50 mA, 16 mA, 5 mA) to the I_OHPGM and I_OLPGM pins.
The voltage-to-current conversion is performed within the
AD53041, thus allowing the current levels to be set by a stan-
dard voltage out digital-to-analog converter.
The AD53041 transition from I_OH to I_OL occurs when the out-
put voltage of the device under test slews above or below the
programmed threshold or commutation voltage. The commuta-
tion voltage is programmable from –2 V to +7 V, covering the
large spectrum of logic devices while able to support the large
current specifications (48 mA) typically associated with line
drivers. To test I/O devices, the active load can be switched into
a high impedance state (Inhibit Mode), electrically removing the
active load from the path through the Inhibit Mode feature. The
active load leakage current in Inhibit is typically 100 nA.
The Inhibit input circuitry is implemented using high speed
differential inputs with a common-mode voltage range of
–2 V to +3 V and a maximum differential voltage of 3 V. This
allows for direct interface to precision differential ECL timing or
the simplicity of switching active load from a single ended TTL
or CMOS logic source. With switching speeds from I_OH or I_OL
into Inhibit of less than 2.0 ns, the AD53041 can be electrically
removed from the signal path “on the fly.”
I_OHPGM
V_COMIN
OUT_SENSE
AD53041
VOLTAGE-TO-CURRENT
CONVERTER
V_COM
BUFFER
GAINA
0
0
1
1
GAINB
0
1
0
1
FULL-SCALE CURRENT
50mA
16mA
5mA
NOT VALID
V_COMOUT
The AD53041 is available in a 20-lead, PSOP package with a
built-in-heatsink and is specified to operate over the ambient
commercial temperature range from –25°C to +85°C.
INH
INH
I_OHPGM
V_COMIN
I_OLPGM
GAINA
GAINB
V_CC
AD53041
0.1␮F
0.1␮F
V_EE
AGND
I_OLOUT
V_COMOUT
OUT_SENSE
1Ω
0.1␮F
GND
I_OHOUT
I_OLRTN
I_OHRTN
TO DUT
HSMS-2818
OR EQUIV.
NOT SHOWN: THE AGND PINS ARE THE HIGH QUALITY GROUND
REFERENCE FOR THE VOLTAGE-TO-CURRENT CONVERTERS.
THE GND PINS PROVIDE RETURN PATHS FOR INTERNAL CURRENTS.
V_CC IS THE POSITIVE SUPPLY, V_EE IS THE NEGATIVE SUPPLY.
ALL GROUND PINS SHOULD BE CONNECTED TO THE SYSTEM
ANALOG GROUND PLANE.
Figure 1. Typical Application Circuit
REV. A
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© Analog Devices, Inc., 1998