REV. A
a
AD53522
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High Speed
Dual Pin Electronic
FUNCTIONAL BLOCK DIAGRAM (One-Half)
DRIVER
COMPARATOR
V/I
V/I
ACTIVE LOAD
1.0H9262A/H11543K
V
CC
V
CC
V
CC
V
EE
V
EE
V
EE
AD53522
VHDCPL
OUT
VLDCPL
PWRGND
H115479
HQGND
VCOM_S
THERM*
+1
VH
VTERM
DATA
IOD
RLD
VL
HCOMP
VCCO
QH
QL
LCOMP
VCOM
IOLC
IOXRTN
INHL
IOHC
VCL
VCH
PROT_HI
PROT_LO
PWRD
GND_ROTDR_GND THERMSTART
*ONLY 1 (ONE) THERM PER DEVICE
INHLB
QLB
QHB
RLDB
IODB
DATAB
FEATURES
1000 MHz Toggle Rate
Driver/Comparator/Active Load and Dynamic Clamp
Included
Inhibit Mode Function
100-Lead LQFP Package with Built-In Heat Sink
Driver
48 H9024 Output Resistance
800 ps Tr/Tf for a 3 V Step
Comparator
1.1 ns Propagation Delay at 3 V
Load
H1155040 mA Voltage Programmable Current Range
50 ns Settling Time to 15 mV
APPLICATIONS
Automatic Test Equipment
Semiconductor Test Systems
Board Test Systems
Instrumentation and Characterization Equipment
PRODUCT DESCRIPTION
The AD53522 is a complete, high speed, single-chip solution
that performs the pin electronics functions of driver, comparator,
and active load (DCL) for ATE applications. In addition, the
driver contains a dynamic clamp function and the active load
contains an integrated Schottky diode bridge.
The driver is a proprietary design that features three active states:
Data High mode, Data Low mode, and Term mode, as well as
an Inhibit State. In conjunction with the integrated dynamic
clamp, this facilitates the implementation of a high speed active
termination. The output voltage range is –0.5 V to +6.5 V to
accommodate a wide variety of test devices.
The dual comparator, with an input range equal to the driver
output range, features PECL compatible outputs. Signal tracking
capability is in the range of 3 V/ns.
The active load can be set for up to 40 mA load current. I
OH
, I
OL
,
and the buffered VCOM are independently adjustable. On-board
Schottky diodes provide high speed switching and low capacitance.
Also included is an on-board temperature sensor that gives an
indication of the silicon surface temperature of the DCL. This
information can be used to measure H9258
JC
and H9258
JA
or flag an alarm
if proper cooling is lost. Output from the sensor is a current sink
that is proportional to absolute temperature. The gain is trimmed
to a nominal value of 1.0 µA/K. As an example, the output current
can be sensed by using a 10 kΩ resistor connected from 10 V to
the THERM (I
OUT
) pin. A voltage drop across the resistor will
be developed that equals 10 kΩ H11003 1 µA/°K = 10 mV/°K=2.98V
at room temperature.