OPA377 datasheet(11/27 Pages) TI1

Part #	OPA377

Description	5MHz, Low-Noise, Single, Dual, Quad CMOS Operational Amplifiers

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Manufacturer	TI1 [Texas Instruments]

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C

1

0.1 F

m

R

100W

1

(1)

+5V

V

IN

ADS8327

LowPower

16-Bit

500kSPS

C

3

(1)

1.2nF

C4

100nF

+5V

REFIN

-IN

+IN

REF5040

4.096V

+5V

OPA377

C

1

1nF

C

150pF

2

R

3

5.49kW

R

1

5.49kW

R

2

12.4kW

V+

V

OUT

V

IN

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

is

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

26

illustrates

the

OPA377

driving

an

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

is

–40dB/dec.

The

Butterworth

response

is

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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Product Folder Link(s): OPA377 OPA2377 OPA4377

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