OPA2377 datasheet(11/26 Pages) TI1

11 / 26 page

0.1 F

100W

(1)

+5V

ADS8327

LowPower

16-Bit

500kSPS

(1)

1.2nF

100nF

+5V

REFIN

-IN

+IN

REF5040

4.096V

+5V

OPA377

1nF

150pF

5.49kW

12.4kW

V+

OUT

OPA377

(V+)/2

OPA377

OPA2377

OPA4377

www.ti.com

SBOS504B

– FEBRUARY 2010 – REVISED JANUARY 2011

ACTIVE FILTERING

DRIVING AN ANALOG-TO-DIGITAL

CONVERTER

The

OPA377

series

well-suited

for

filter

applications requiring a wide bandwidth, fast slew

The low noise and wide gain bandwidth of the

rate, low-noise, single-supply operational amplifier.

OPA377 family make it an ideal driver for ADCs.

Figure 25 shows a 50kHz, 2nd-order, low-pass filter.

Figure

illustrates

the

OPA377

driving

The components have been selected to provide a

ADS8327, 16-bit, 250kSPS converter. The amplifier is

maximally-flat Butterworth response. Beyond the

connected as a unity-gain, noninverting buffer.

cutoff

frequency,

roll-off

–40dB/dec.

The

Butterworth

response

ideal

for

applications

requiring predictable gain characteristics such as the

anti-aliasing filter used ahead of an analog-to-digital

converter (ADC).

(1) Suggested value; may require adjustment based on specific

application.

(2) Initial calibration recommended.

Figure 26. Driving an ADS8327(2)

Figure 25. Second-Order Butterworth 50kHz

Low-Pass Filter

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