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| OPA320 Datasheet, PDF (17/31 Pages) Texas Instruments – Precision, 20MHz, 0.9pA, Low-Noise, RRIO, CMOS Operational Amplifier with Shutdown | |||
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DRIVING ADCS
The OPA320 series op amps are well-suited for
driving sampling analog-to-digital converters (ADCs)
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.
+5V
50kW
(2.5V)
8
OPA320, OPA2320
OPA320S, OPA2320S
SBOS513D â AUGUST 2010 â REVISED NOVEMBER 2011
The OPA320 can be used to buffer the ADC switched
input capacitance and resulting charge injection while
providing signal gain. Figure 40 shows the OPA320
configured to drive the ADS8326.
REF1004-2.5
4
+5V
R1
100kW
RG
R2
25kW
+5V
1/2
OPA2320
R3
25kW
R4
100kW
1/2
OPA2320
G = 5 + 200kW
RG
VOUT
RL
10kW
Figure 39. Two Op Amp Instrumentation Amplifier with Improved High-Frequency Common-Mode
Rejection
+5V
VIN
0 to 4.096V
V+
OPA320
V-
C1
100nF
R1(1)
100W
C3(1)
1nF
R2
50kW
-5V
Optional(2)
SD1
BAS40
C2
100nF
+5V
REF3240
4.096V
+5V
+IN
ADS8326
16-Bit
-IN 250kSPS
REF IN
C4
100nF
(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 â0.3V supply to allow output swing to true ground potential.
Figure 40. Driving the ADS8326
Copyright © 2010â2011, Texas Instruments Incorporated
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Product Folder Link(s): OPA320 OPA2320 OPA320S OPA2320S
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