SHC605 Datasheet, PDF (13/15 Pages) Burr-Brown (TI) – High-Speed Operational TRACK-AND-HOLD AMPLIFIER

Figure 10. This is particularly important when driving high
capacitance loads such as flash A/D converters.
The series resistor, R_S, should be connected as close to the
SHC605 as possible. If R_S causes excessive output attenua-
tion, add closed-loop gain to the SHC605 as shown in
Figures 4 through 6.
In general, capacitive loads should be minimized for opti-
mum high frequency performance. Coax lines can be driven
if the cable is properly terminated. The capacitance of
coaxial cable (29pF/foot for RG-58) will not load the ampli-
fier when the coaxial cable or transmission line is terminated
in its characteristic impedance.
APPLICATIONS
The SHC605’s combination of high speed and accuracy,
small size, and low price makes it ideally suited for many
data acquisition applications. Its versatile operational ampli-
fier architecture and switching flexibility provides users
with an extremely reliable single-chip solution to problems
that previously required several components. Figures 11
through 16 show many application circuits using the SHC605.
These include high-speed flash and sub-ranging ADC driv-
ing, multi-channel simultaneous sampling, DAC deglitching,
and peak detecting.
Analog
Input
SHC605
Hold
High-speed Sub-ranging
or Flash
ADC
Digital
Output
Convert
Sampling
Clock
FIGURE 11. Sampling ADC.
Analog Input
Ch 1
Ch 2
Ch 3
Ch 4
Analog
MUX
Channel
Select
Timing
Circuit
SHC605
Hold
Sampling
Clock
FIGURE 12. Traditional Data Acquisition System.
Timing
Circuit
ADC
Digital
Output
Convert
®
13
SHC605