OPA376-Q1_016 Datasheet, PDF (18/39 Pages) Texas Instruments – Low-Noise, Low Quiescent Current, Precision Operational Amplifier e-trim Series

OPA376-Q1, OPA2376-Q1, OPA4376-Q1
SBOS549B – APRIL 2011 – REVISED JUNE 2016
www.ti.com
Application Information (continued)
8.1.2 Active Filtering
The OPA376-Q1 series is well-suited for filter applications requiring a wide bandwidth, fast slew rate, low-noise,
single-supply operational amplifier. Figure 26 shows a 50-kHz, second-order, low-pass filter. The components
have been selected to provide a maximally-flat Butterworth response. Beyond the cutoff frequency, roll-off is
–40 dB/dec. The Butterworth response is ideal for applications requiring predictable gain characteristics such as
the anti-aliasing filter used ahead of an ADC.
R₃
5.49kW
C₂
150pF
R₁
5.49kW
R₂
12.4kW
C₁
V_IN
1nF
V+
OPA376
V_OUT
(V+)/2
Figure 26. Second-Order Butterworth, 50-kHz Low-Pass Filter
8.1.3 Driving an Analog-to-Digital Converter
The low noise and wide gain bandwidth of the OPA376-Q1 family make it an ideal driver for ADCs. Figure 27
illustrates the OPA376-Q1 driving an ADS8327, 16-bit, 250-kSPS converter. The amplifier is connected as a
unity-gain, noninverting buffer.
+5V
C₁
0.1mF
OPA376
(1)
R₁
100W
(1)
C₃
1.2nF
V_IN
+5V
+IN _ADS8327
Low Power
-IN
16-Bit
500kSPS
REF IN
+5V
REF5040
4.096V
C4
100nF
(1) Suggested value; may require adjustment based on specific application.
Figure 27. Driving an ADS8327
18
Submit Documentation Feedback
Copyright © 2011–2016, Texas Instruments Incorporated
Product Folder Links: OPA376-Q1 OPA2376-Q1 OPA4376-Q1