OPA363IDBVR datasheet(10/27 Pages) TI

10 / 27 page

OPA363, 2363, 364, 2364, 4364

SBOS259B

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FIGURE 7. The OPA363 and OPA364 Directly Drive the

ADS8324.

FIGURE 9. OPA2363 Configured as Half of a Dual Stereo Headphone Driver.

FIGURE 8. Driving the 12-Bit A/D Converter on the MSP430.

BUFFERED REFERENCE VOLTAGE

Many single-supply applications require a mid-supply refer-

ence voltage. The OPA363 and OPA364 offer excellent

capacitive load drive capability, and can be configured to

provide a 0.9V reference voltage, as can be seen in Figure 6.

For appropriate loading considerations, see the “Capacitive

Load” section.

AUDIO APPLICATIONS

The OPA363 and OPA364 op amp family has linear offset

voltage over the entire input common-mode range. Com-

bined with low-noise, this feature makes the OPA363 and

OPA364 suitable for audio applications. Single supply 1.8V

operation allows the OPA2363 and OPA2364 to be optimal

candidates for dual stereo-headphone drivers and micro-

phone pre-amplifiers in portable stereo equipment, see Fig-

ures 9 and 10.

FIGURE 6. The OPA363 and OPA364 Provide a Stable

Reference Voltage.

V+

10k

Ω

10k

Ω

0.9V

OPAx363

OPAx364

V+

L = 1µF

ADS8324

V+ = 1.8V

OPA363

OPA364

100

Ω

1nF

MSP430

V+

100

Ω

1nF

OPA363

OPA364

V+

V–

20k

Ω

1/2

OPA2363

One of Right or Left Channel

One of Right or Left

Headphone Out

10k

Ω

20k

Ω

V+

V–

Internally

Biased

20k

Ω

1/2

TPS6100

20k

Ω

10k

Ω

µF

47pF

V–

DIRECTLY DRIVING THE ADS8324 AND

THE MSP430

The OPA363 and OPA364 series op amps are optimized for

driving medium speed (up to 100kHz) sampling A/D convert-

ers. However, they also offer excellent performance for

higher speed converters. The no crossover input stage of the

OPA363 and OPA364 directly drive A/D converters without

degradation of differential linearity and THD. They provide an

effective means of buffering the A/D converters input capaci-

tance and resulting charge injection while providing signal

gain. Figure 7 and Figure 8 show the OPA363 and OPA364

configured to drive the ADS8324 and the 12-bit

A/D converter on the MSP430.

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