AD53509_15 Datasheet, PDF (1/12 Pages) Analog Devices – High Performance Driver/Comparator

High Performance Driver/Comparator,
Active Load on a Single Chip
AD53509
FEATURES
250 MHz operation
Driver/comparator and active load included
On-chip Schottky diode bridge
52-lead LQFP_EP package
APPLICATIONS
Automatic test equipment (ATE)
Semiconductor test systems
Board test systems
Instrumentation and characterization equipment
GENERAL DESCRIPTION
The AD53509 is a single chip that performs the pin electronics
functions of driver, comparator, and active load in ATE VLSI
and memory testers. In addition, a Schottky diode bridge for
the active load and a VCOM buffer are included internally.
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. The output voltage range is −2 V to +7 V to
accommodate a wide variety of test devices. The output leakage
is typically <250 nA over the signal range.
The dual comparator, with an input range equal to the driver
output range, features built-in latches and ECL-compatible
outputs. The outputs are capable of driving 50 Ω signal lines
terminated to −2 V. Signal tracking capability is >5 V/ns.
The active load can be set up to 40 mA load current with less
than a 10 μA linearity error through the set range. IOH, IOL, and
the buffered VCOM are independently adjustable. On-board
Schottky diodes provide high speed switching and low
capacitance.
Also included on the chip is an on-board temperature sensor
whose purpose is to give an indication of the surface temperature
of the DCL. This information can be used to measure θJC and θJA
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. For example,
the output current can be sensed by using a 10 kΩ resistor
connected from 10 V to the THERM pin. A voltage drop across
the resistor then develops that equals
10 K × 1 μA/K = 10 mV/K = 2.98 V (at room temperature)
FUNCTIONAL BLOCK DIAGRAM
V_CC
V_H 47
V_T 45
DATA 37
DATA 38
IOD 43
IOD 42
RLD 49
RLD 50
V_L 31
HCOMP
LEH
LEH
QH
QH
V_CC V_CC V_CC
51
52
34
V_EE
39
DRIVER
V_EE V_EE V_EE
40
41
32
AD53509
46Ω
COMPARATOR
QL
QL
LEL
LEL
LCOMP
VCOMI
ACTIVE LOAD
+1
IOLC
V/I
39nF
CHDCPL
VHDCPL
39nF
CLDCPL
V_OUT
VLDCPL
VCOMS
IOLRTN
IOHRTN
INHL 36
INHL 35
IOHC
V/I
9 33 44 46 48
PWRGND
NC = NO CONNECT
OUT_L
258
VCCO
1.0µA/K
THERM
14 NC
26 NC
HQGND2 HQGND
Figure 1.
Rev. B
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