Datasheet

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SLAS412− DECEMBER 2003
www.ti.com
40
PAGE 2 CONTROL REGISTER MAP
REGISTER 00H: Audio Control 1
BIT NAME
READ/
WRITE
RESET
VALUE
FUNCTION
D15−D14 ADCHPF R/W 00 ADC High Pass Filter
00 => Disabled
01 => −3dB point = 0.0045 x Fs
10 => −3dB point = 0.0125 x Fs
11 => −3dB point = 0.025 x Fs
Note: Fs is ADC sample rate
D13−D12 ADCIN R/W 00 ADC Input Mux
00 => ADC Input = Single-ended input MIC
01 => ADC Input = Single-ended input AUX
10 => ADC Input = Differential input MICIN and AUX
11 => ADC Input = Differential input MICIN and AUX
D11−D10 WLEN R/W 00 Codec Word Length
00 => Word length = 16 bit
01 => Word length = 20 bit
10 => Word length = 24 bit
11 => Word length = 32 bit
D9−D8 DATFM R/W 00 Digital Data Format
00 => I
2
S mode
01 => DSP mode
10 => Right justified
11 => Left justified
Note: Right justified, valid only when the ratio between DAC and ADC sample rate is an integer.
e.g., ADC = 32 kHz and DAC = 24 kHz or vice-versa is invalid for right-justified mode.
D7−D6 R 00 Reserved
D5−D3 DACFS R/W 000 DAC Sampling Rate
000 => DAC FS = Fsref/1
001 => DAC FS = Fsref/(1.5)
010 => DAC FS = Fsref/2
011 => DAC FS = Fsref/3
100 => DAC FS = Fsref/4
101 => DAC FS = Fsref/5
110 => DAC FS = Fsref/(5.5)
111 => DAC FS = Fsref/6
Note: Fsref can be set between 39 kHz and 53 kHz
D2−D0 ADCFS R/W 000 ADC Sampling Rate
000 => ADC FS = Fsref/1
001 => ADC FS = Fsref/(1.5)
010 => ADC FS = Fsref/2
011 => ADC FS = Fsref/3
100 => ADC FS = Fsref/4
101 => ADC FS = Fsref/5
110 => ADC FS = Fsref/(5.5)
111 => ADC FS = Fsref/6
Note: Fsref can be set between 39 kHz and 53 kHz