sta538 STMicroelectronics, sta538 Datasheet - Page 16

• Manufacturer Part Number: sta538
• Description: 2 X 1.3 W Class-d Amplifier With Analog Or Digital Input 2.0 Multichannel Digital Audio Processor With Ffx
• Manufacturer: STMicroelectronics

Digital processing
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4.1
4.2
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Signal processing flow
Digital processing
The STA538 processor block is a digital block providing two channels of audio processing
and channel-mapping capability.
I
ADC sampling frequency can be selected from 8 kHz to 48 kHz.
I
When pin I2CDIS = 1, the SDA, SCL, LRCLKO and BICLKO pins can be pulled high or low
to change certain parameters of operation.
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At power up, the master volume is set to -60 dB. When holding pin LRCLKO = 1 and pin
BICLKO = 1 simultaneously, the master volume is set to 0 dB. A high pulse on pin LRCLKO
causes a master volume change of +0.5 dB and a high pulse on pin BICLKO causes a
master volume change of -0.5 dB.
2
2
S or stereo ADC data can be selected. The I
C interface disabled
SDA = 0: FFX input comes from ADC
SDA = 1: FFX input comes from digital audio interface
SCL = 0: binary output mode (binary soft start/stop enabled)
SCL = 1: phase shift output mode
LRCLKO = 0: no volume change
LRCLKO = 1: volume up
BICLKO = 0: no volume change
BICLKO = 1: volume down
2
S frequency range is from 8 kHz to 192 kHz.
STA538