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| OPA2320-Q1_15 Datasheet, PDF (20/31 Pages) Texas Instruments – Precision, 20-MHz, 0.9-pA, Low-Noise, RRIO,CMOS Operational Amplifier | |||
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OPA2320-Q1
SLOS884 â SEPTEMBER 2014
5V
50 kΩ
(2.5 V)
8
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REF1004-2.5
4
5V
R1
100 kΩ
R(G)
R2
25 kΩ
5V
½
OPA2320-Q1
R3
25 kΩ
R4
100 kΩ
½
OPA2320-Q1
G = 5 + 200 kΩ
R(G)
VO
R(L)
10 kΩ
Figure 41. Two Op-Amp Instrumentation Amplifier With Improved High-Frequency Common-Mode
Rejection
5V
VI
0 to 4.096 V
C1
100 nF
V(V+)
OPA320-Q1
V(Vâ)
R1(1)
100 Ω
C3(1)
1 nF
â5 V
R2
50 kΩ
Optional(2)
SD1
BAS40
C2
100 nF
5V
REF3240
4.096V
5V
+INx
âINx
ADS8326
16-Bit
250kSPS
REF IN
C4
100 nF
(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 â0.3-V supply to allow output swing to true ground potential.
Figure 42. Driving the ADS8326
8.2.4 Active Filter
The OPA2320-Q1 device is well-suited for active filter applications that require a wide bandwidth, fast slew rate,
low-noise, single-supply operational amplifier. Figure 43 shows a 500 kHz, second-order, low-pass filter using the
multiple-feedback (MFB) topology. The components have been selected to provide a maximally-flat Butterworth
response. Beyond the cutoff frequency, roll-off is â40 dB/dec. The Butterworth response is ideal for applications
requiring predictable gain characteristics, such as the anti-aliasing filter used in front of an ADC.
20
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Product Folder Links: OPA2320-Q1
Copyright © 2014, Texas Instruments Incorporated
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