32-Channel Infinite
Sample-and-Hold
a
AD5533*
GENERAL DESCRIPTION
FEATURES
The AD5533 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 repre-
sentation 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
High Integration: 32-Channel SHA in 12 ؋
12 mm2 LFBGA
Per Channel Acquisition Time of 16 s max
Adjustable Voltage Output Range
Output Voltage Span 10 V
Output Impedance 0.5 ⍀
Readback Capability
DSP-/Microcontroller-Compatible Serial Interface
Parallel Interface
Temperature Range –40؇C to +85؇C
APPLICATIONS
Level Setting
Instrumentation
Automatic Test Equipment
Industrial Control Systems
Data Acquisition
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.
PRODUCT HIGHLIGHTS
1. Infinite Droopless Sample-and-Hold Capability.
Low Cost I/O
2. The AD5533 is available in a 74-lead LFBGA package with a
body size of 12 mm × 12 mm.
FUNCTIONAL BLOCK DIAGRAM
DV
CC
AV
OFFS IN
V
V
SS
REF IN REF OUT
CC
DD
V
0
OUT
V
ADC
DAC
IN
TRACK/RESET
BUSY
V
31
OUT
AD5533
DAC
DAC
DAC GND
AGND
OFFS OUT
DGND
INTERFACE
CONTROL
LOGIC
SER/PAR
WR
ADDRESS INPUT REGISTER
OFFSET SEL
A4–A0
CAL
SCLK
D
D
SYNC/CS
IN
OUT
*Protected by U.S. Patent No. 5,969,657; other patents pending.
REV. 0
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reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which 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., 2000