STA33013TR 데이터 시트보기 (PDF) - STMicroelectronics

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STA33013TR

2.0 digital audio processor with FFX digital modulator and analog and digital inputs

STMicroelectronics 

STA330

Analog-digital converter (ADC)

7

Analog-digital converter (ADC)

7.1

7.1.1

Functional description

The STA330 analog input is provided through a low-power, low-voltage, stereo, audio-ADC

front end designed for audio applications. It includes a programmable gain amplifier, anti-

aliasing filter, a low-noise microphone biasing circuit, a third-order, MASH2-1, delta-sigma

modulator, a digital decimating filter and a first-order DC-removal filter. This device is

fabricated using a 0.18 µm CMOS process, where high-speed precision analog circuits are

combined with high-density logic circuits.

The ADC works in a microphone-input (mic-in) mode and in a line-input mode.

If the line-input mode is selected, the ADC is configured in stereo and all conversion

channels are active.

If the microphone-input mode is selected, the ADC is configured in mono. The mono

channel is routed through the left conversion path, and the right conversion path is kept in

power-down mode to minimize power consumption. A programmable gain amplifier (PGA) is

available in mic-in mode, giving the possibility to amplify the signal from 0 to +42 dB in steps

of 6 dB.

Digital anti-aliasing filter characteristics

The digital filter characteristics are shown in Table 12.

Table 12. Digital filter characteristics

Parameter

Pass band

Pass band ripple:

Fs mode

Fs_by_2 mode

Fs_by_4 mode

Stop band attenuation:

Fs mode

Fs_by_2 mode

Fs_by_4 mode

Group delay:

Fs mode

Fs_by_2 mode

Fs_by_4 mode

0.4535 * fS

Typical

0.08 dB at 44.1 kHz

0.08 dB at 22.05 kHz

0.08 dB at 11.025 kHz

45 dB at 44.1 kHz

45 dB at 22.05 kHz

45 dB at 11.025 kHz

0.4 ms at 32 kHz

0.7 ms at 16 kHz

1.4 ms at 8 kHz

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