STA538B datasheet(24/59 Pages) STMICROELECTRONICS

部件名	STA538B

功能描述	2 x 1.3 W class-D amplifier with analog or digital input 2.0 multichannel digital audio processor with FFX

PDF	59 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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ADC

STA538

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6.1.2

High-pass filter characteristics

6.1.3

Programmable gain amplifier

The programmable gain amplifier (PGA) is available in mic-in mode only. It is possible to

amplify the input signal from 0 to 42 db in steps of 6 db. The setting is done through PGA

bits of the ADCCFG register (see ADCCFG on page 50 for details).

See Table 11 on page 15 for performance values.

6.2

Application scheme

Figure 6 shows the filter circuit.

Figure 6.

Block diagram

Table 16.

High-pass filter characteristics

Parameter

Typical

Unit

Frequency response:

-3 dB

-0.08 dB

Phase deviation at 20 Hz

19.35

degree

Passband ripple

0.08

AC coupled

DC coupled

AC coupled

3 V, 3 A supply

VSSA

INL

INR

AVDD

AGND

VHI

VLO

VCM

VBIAS

C1, C2, C3, C4 = 10 nF

(These capacitors must be

placed very close to their

respective pins)

C5, C6, C7 = 33 µF

(Low ESR and ESL

capacitors are

recommended)

VSSA plane must be

different from other

ground plane

3V, 3A must be a

low-noise supply and

separate from

other supplies

R1 = 500

Ω

C8 = 10 µF

C9, C0 = 1 µF

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