Datasheet

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PCM1738
SBAS174C – FEBRUARY 2002 – REVISED FEBRUARY 2007
Table 3. User-Programmable Mode Controls
FUNCTION DEFAULT REGISTER BIT
FUNCTIONS AVAILABLE FOR BOTH WRITE AND READ
Digital attenuation control 0 dB 16 for L-channel ATL[7:0]
0 dB to –120 dB in 0.5-dB steps 17 for R-channel ATR[7:0]
Attenuation load control Attenuation disabled 18 ATLD
Disabled, enabled
Attenuation speed selection × 1 f
S
19 ATS[1:0]
× 1 f
S
, × (1/2) f
S
, × (1/4) f
S
, × (1/8) f
S
Soft mute control Mute disabled 18 MUTE
Mute disabled, enabled
Infinite zero mute control Disabled 19 INZD
Disabled, enabled
Input audio data format selection 16-bit standard format 18 FMT[2:0]
16-, 20-, 24-bit standard (right-justified) format
24-bit, MSB-first, left-justified format
16-, 24-bit I
2
S format
De-emphasis control De-emphasis disabled 18 DME
Disabled, enabled
Sampling rate selection for de-emphasis De-emphasis disabled 18 DMF[1:0]
Disabled, 44.1 kHz, 48 kHz, 32 kHz
Digital filter rolloff selection Sharp rolloff 19 FLT
Sharp rolloff, slow rolloff
Output phase reversal Normal 19 REV
Normal, reversed
DAC operation control DAC operation 19 OPE
Enabled, disabled enabled
System clock (SCKO) output control Output enabled 19 CLKE
Output Enabled, disabled
System clock (SCKO) rate control SCKI 19 CLKD
SCKI, SCKI/2
System reset control Normal operation 20 SRST
Reset operation, normal operation
Mode control register reset control Normal operation 20 MRST
Reset operation, normal operation
Digital-filter bypass control DF enabled 20 DFTH
DF enabled, DF bypassed
Delta-sigma oversampling rate selection × 64 f
S
20 OS[1:0]
× 64 f
S
, × 128 f
S
, × 32 f
S
Monaural mode selection Stereo 20 MONO
Stereo, monaural
Channel selection for monaural mode data L-channel 20 CHSL
L-channel, R-channel
FUNCTIONS AVAILABLE ONLY FOR READ
Zero detection flag Not zero = 0 21 ZFGL for L-channel
Not zero, zero detected Zero detected = 1 ZFGR for R-channel
22
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