Octal Sample-and-Hold
with Multiplexed Input
a
SMP08*
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Internal Hold Capacitors
Low Droop Rate
(LSB)
A
(MSB)
C
INPUT
3
B
INH
6
TTL/CMOS Compatible Logic Inputs
Single or Dual Supply Operation
Break-Before-Make Channel Addressing
Compatible With CD4051 Pinout
Low Cost
11
10
9
8
DGND
1 OF 8 DECODER
16
13
V
DD
SW
CH OUT
0
APPLICATIONS
Multiple Path Timing Deskew for ATE
Memory Programmers
Mass Flow/Process Control Systems
Multichannel Data Acquisition Systems
Robotics and Control Systems
Medical and Analytical Instrumentation
Event Analysis
14
SW
CH OUT
1
SW
15 CH OUT
2
SW
12 CH OUT
3
CH OUT
4
SW
1
5
2
4
Stage Lighting Control
CH OUT
5
SW
CH OUT
6
SW
GENERAL DESCRIPTION
SW
CH OUT
7
The SMP08 is a monolithic octal sample-and-hold; it has eight
internal buffer amplifiers, input multiplexer, and internal hold
capacitors. It is manufactured in an advanced oxide isolated
CMOS technology to obtain high accuracy, low droop rate, and
fast acquisition time. The SMP08 has a typical linearity error of
only 0.01% and can accurately acquire a 10-bit input signal to
±1/2 LSB in less than 7 microseconds. The SMP08’s output
swing includes the negative supply in both single and dual sup-
ply operation.
HOLD CAPS
(INTERNAL)
V
7
SS
SMP08
The SMP08 is also ideally suited for a wide variety of sample-
and-hold applications including amplifier offset or VCA gain
adjustments. One or more SMP08s can be used with single or
multiple DACs to provide multiple set points within a system.
The SMP08 was specifically designed for systems that use a
calibration cycle to adjust a multiple of system parameters. The
low cost and high level of integration make the SMP08 ideal for
calibration requirements that have previously required an
ASIC, or high cost multiple D/A converters.
The SMP08 offers significant cost and size reduction over dis-
crete designs. It is available in a 16-pin plastic DIP, or surface-
mount SOIC package.
*Protected by U.S. Patent No. 4,739,281.
REV. D
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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., 1996