OPA320SAIDBVT datasheet(25/58 Pages) TI2

25 / 58 page

-5V

V-

Optional

(2)

100nF

(1)

100W

50kW

100nF

V+

+5V

SD1

BAS40

0 to 4.096V

ADS8326

16-Bit

250kSPS

(1)

1nF

100nF

+5V

REF IN

-IN

+IN

REF3240

4.096V

+5V

OPA320

OPA320, OPA2320, OPA320S, OPA2320S

www.ti.com

SBOS513F – AUGUST 2010 – REVISED DECEMBER 2016

Product Folder Links: OPA320 OPA2320 OPA320S OPA2320S

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Application Information (continued)

(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 –0.3-V supply to allow output swing to

true ground potential.

Figure 44. Driving the ADS8326

8.1.5 Active Filter

The OPA320 is well-suited for active filter applications that require a wide bandwidth, fast slew rate, low-noise,

single-supply operational amplifier. Figure 45 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 –40 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.

One point to observe when considering the MFB filter is that the output is inverted, relative to the input. If this

inversion is not required, or not desired, a noninverting output can be achieved through one of these options:

1. Adding an inverting amplifier;

2. Adding an additional second-order MFB stage; or

3. Using a noninverting filter topology, such as the Sallen-Key (shown in Figure 46).

MFB and Sallen-Key, low-pass and high-pass filter synthesis is quickly accomplished using TI’s FilterPro™

program. This software is available as a free download at www.ti.com.

OPA320SAIDBVT Datasheet(PDF) 25 Page - Texas Instruments

OPA320SAIDBVT Datasheet(HTML) 25 Page - Texas Instruments

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