SHC5320 Datasheet, PDF (9/11 Pages) Burr-Brown (TI) – High-Speed, Bipolar, Monolithic SAMPLE/HOLD AMPLIFIER

Analog Input
PAM Output
Mode _Hold
Control
Sample
FIGURE 10. PAM Output.
DATA DISTRIBUTION
The SHC5320 may be used to hold the output of a digital-
to-analog converter and distribute several different analog
voltages to different loads (see Figure 11).
HIGH-SPEED DATA ACQUISITION
The minimum sample time for one channel in a data acqui-
sition system is usually considered to be the acquisition time
of the sample/hold plus the conversion time of the A/D
converter. If two or more sample/holds are used with a
multiplexer (such as the Burr-Brown MPC800 or MPC801)
as shown in Figure 12, the acquisition time of the sample/
hold can be virtually eliminated. While the first channel is in
hold and switched into the A/ D converter, the multiplexer
may be addressed to the next channel. The second sample/
hold will have acquired this signal by the time the conver-
sion is complete. Then, the sample/holds reverse roles and
another channel is addressed. In low level systems an instru-
mentation amplifier (such as the Burr-Brown INA101) and
a differential multiplexer (such as the Burr-Brown MPC509A
or MPC507A) may be required in front of the sample/hold.
The settling and acquisition times of the multiplexer, instru-
mentation amplifier, and sample/hold can be eliminated
from the total conversion time as before by operating in this
overlapped mode with the sample/holds.
1
SHC5320 ⁷
2
14
6
Analog
Outputs
Channel 1
Parallel
Inputs
D/A
Converter
Digital
Inputs
1
7
SHC5320
2
14
6
Additional SHC5320 Units
Channel 2
1
7
SHC5320
2
14
6
Channel N
Mode
Control
Logic
Signal
Common
FIGURE 11. Typical Data Distribution Configuration.
®
9
SHC5320