Datasheet

-5V
V-
Optional
(2)
C
100nF
1
R
(1)
100W
1
R
50kW
2
C
100nF
2
V+
+5V
SD1
BAS40
V
0to4.096V
IN
ADS8326
16-Bit
250kSPS
C
(1)
1nF
3
C
100nF
4
+5V
REFIN
-IN
+IN
REF3240
4.096V
+5V
OPA320
1/2
OPA2320
1/2
OPA2320
R
3
25kW
R
2
25kW
R
G
R
1
100kW
R
4
100kW
R
L
10kW
V
OUT
50kW
G=5+
200kW
R
G
+5V
+5V
REF1004-2.5
4
8
(2.5V)
+5V
OPA320, OPA2320
OPA320S, OPA2320S
SBOS513E –AUGUST 2010–REVISED JUNE 2013 www.ti.com
DRIVING ADCS The OPA320 can be used to buffer the ADC switched
input capacitance and resulting charge injection while
The OPA320 series op amps are well-suited for
providing signal gain. Figure 44 shows the OPA320
driving sampling analog-to-digital converters (ADCs)
configured to drive the ADS8326.
with sampling speeds up to 1MSPS. The zero-
crossover distortion input stage topology allows the
OPA320 to drive ADCs without degradation of
differential linearity and THD.
Figure 43. Two Op Amp Instrumentation Amplifier with Improved High-Frequency Common-Mode
Rejection
(1) Suggested value; may require adjustment based on specific application.
(2) Single-supply applications lose a small number of ADC codes near ground as a result of op amp output swing limitation. If a negative
power supply is available, this simple circuit creates a –0.3V supply to allow output swing to true ground potential.
Figure 44. Driving the ADS8326
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