AD75019 Datasheet, PDF (1/4 Pages) Analog Devices – 16 x 16 Crosspoint Switch Array

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FEATURES
256 Switches in a 16 ؋ 16 Array
Wide Signal Range: to Supply Rails of 24 V or ؎12 V
Low On-Resistance: 200 ⍀ Typ
TTL/CMOS/Microprocessor-Compatible Control Lines
Serial Input Simplifies Interface
Serial Output Allows Cascading for More Channels
Low Power Consumption: 2 mW Quiescent
Compact 44-Lead PLCC
16 ؋ 16 Crosspoint
Switch Array
AD75019
FUNCTIONAL BLOCK DIAGRAM
ANALOG
X0
INPUTS/OUTPUTS
X15
VDD VSS VCC DGND
Y0
ANALOG
OUTPUTS/
INPUTS
Y15
SERIAL DATA IN
+12V –12V +5V DGND
ANALOG
SWITCH
LATCH
SHIFT
REGISTER
CELL #256
BUSED CLOCK
LINES
SERIAL
DATA
TO NEXT
STAGES
16 ؋ 16 ARRAY OF SWITCHES,
LATCHES, AND SHIFT REGISTER
CELLS (ONLY TWO LOCATIONS
ARE SHOWN FOR CLARITY)
AD75019
BUSED CLOCK
LINES
SERIAL
DATA
FROM
PRIOR
STAGES
ANALOG
SWITCH
LATCH
SHIFT
REGISTER
CELL #1
PARALLEL SERIAL
CLOCK CLOCK
PCLK
SCLK SOUT
PRODUCT DESCRIPTION
The AD75019 contains 256 analog switches in a 16 × 16 array.
Any of the X or Y pins may serve as an input or output. Any or
all of the X terminals may be programmed to connect to any or
all of the Y terminals. The switches can accommodate signals
with amplitudes up to the supply rails and have a typical on-
resistance of 150 Ω.
Data is loaded serially via the SIN input and clocked into an on-
board 256-bit shift register via SCLK. When all the switch set-
tings have been programmed, data is transferred into a set of
256 latches via PCLK. The serial shift register is dynamic, so
there is a minimum clock rate of 20 kHz. The maximum clock
rate of 5 MHz allows loading times as short as 52 µs. The switch
control latches are static and will hold their data as long as power
is applied.
To extend the number of switches in the array, you may cascade
multiple AD75019s. The SOUT output is the end of the shift
register, and may be connected to the SIN input of the next
AD75019.
The AD75019 is fabricated in Analog Devices’ BiMOS II
process. This epitaxial BiCMOS process features CMOS
devices for low distortion switches and bipolar devices for
ESD protection.
REV. C
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© Analog Devices, Inc., 1999