32-Channel Precision
a
Infinite Sample-and-Hold
AD5533B*
GENERAL DESCRIPTION
FEATURES
The AD5533B combines a 32-channel voltage translation function
with an infinite output hold capability. An analog input voltage on
the common input pin, VIN, is sampled and its digital represen-
tation transferred to a chosen DAC register. VOUT for this DAC
is then updated to reflect the new contents of the DAC register.
Channel selection is accomplished via the parallel address inputs
A0–A4 or via the serial input port. The output voltage range is
determined by the offset voltage at the OFFS_IN pin and the gain
of the output amplifier. It is restricted to a range from VSS + 2 V
to VDD – 2 V because of the headroom of the output amplifier.
Infinite Sample-and-Hold Capability to ؎0.018% Accuracy
Infinite Sample-and-Hold Total Unadjusted Error ؎2.5 m V
High Integration:
32-Channel DAC in 12 mm ؋
12 mm CSPBGA
Per Channel Acquisition Time of 16 s Max
Adjustable Voltage Output Range
Output Impedance 0.5 ⍀
Output Voltage Span 10 V
Readback Capability
DSP/Microcontroller Compatible Serial Interface
Parallel Interface
Temperature Range –40؇C to +85؇C
The device is operated with AVCC = +5 V 5%, DVCC = +2.7 V
to +5.25 V, VSS = –4.75 V to –16.5 V, and VDD = +8 V to
+16.5 V and requires a stable 3 V reference on REF_IN as well
as an offset voltage on OFFS_IN.
APPLICATIONS
Optical Networks
Automatic Test Equipment
Level Setting
PRODUCT HIGHLIGHTS
1. Precision infinite droopless sample-and-hold capability.
Instrumentation
Industrial Control Systems
Data Acquisition
Low Cost I/O
2. The AD5533B is available in a 74-lead CSPBGA with a
body size of 12 mm ϫ 12 mm.
3. In infinite sample-and-hold mode, a total unadjusted error of
2.5 mV is achieved by laser-trimming on-chip resistors.
FUNCTIONAL BLOCK DIAGRAM
DV
AV
V
V
SS
OFFS IN
REF IN REF OUT
CC
CC
DD
V
0
OUT
V
IN
DAC
ADC
TRACK/RESET
BUSY
DAC GND
AGND
V
31
OUT
AD5533B
DAC
DAC
OFFS OUT
DGND
INTERFACE
CONTROL
LOGIC
SER/PAR
WR
ADDRESS INPUT REGISTER
SCLK
D
D
A4–A0
CAL OFFSET SEL
SYNC/CS
IN
OUT
*Protected by U.S. Patent No. 5,969,657; other patents pending.
REV. A
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reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2002