Datasheet

MODE CONTROL REGISTERS
USER-PROGRAMMABLE MODE CONTROLS
REGISTER MAP
RESERVED REGISTERS
PCM1680
www.ti.com .................................................................................................................................................. SLES133B – MARCH 2005 – REVISED OCTOBER 2008
The PCM1680 includes a number of user-programmable functions which are accessed via control registers. The
registers are programmed using the serial control interface which is discussed in the Mode Control section of this
data sheet. Table 5 lists the available mode control functions, along with the respective reset default conditions
and associated register index.
The mode control register map is shown in Table 6 . The MSB of all registers is fixed to 0. Each register also
includes an index (or address) indicated by the IDX[6:0] bits.
Registers 0, 11, and 15 are reserved for factory use. To ensure proper operation, the user should not write to
these registers.
Table 5. User-Programmable Mode Controls
FUNCTION RESET DEFAULT REGISTER BIT
Digital attenuation control, 0 dB to – 63 dB AT1[7:0], AT2[7:0], AT3[7:0], AT4[7:0],
0 dB, no attenuation 1 – 6, 16, 17
in 0.5-dB steps AT5[7:0], AT6[7:0], AT7[7:0], AT8[7:0]
Soft mute control Mute disabled 7, 18 MUT[6:1], MUT[8:7]
DAC1 – DAC8 operation control DAC1 – DAC8 enabled 8, 19 DAC[6:1], DAC[8:7]
Audio data format control 24-bit, left-justified 9 FMT[2:0]
Digital filter roll-off control Sharp roll-off 9 FLT
De-emphasis of all channels
De-emphasis all-channel function control 10 DMC
disabled
De-emphasis all-channel sample rate
44.1 kHz 10 DMF[1:0]
selection
Output phase select Normal phase 10 DREV
Zero-flag polarity select High 10 ZREV
Software reset control Reset disabled 10 SRST
Oversampling rate control x64, x32, x16 12 OVER
ZERO1: DATA1 Lch
Zero-flag combination select 13 AZRO[1:0]
ZERO2: DATA1 Rch
Digital attenuation mode select 0 to – 63 dB, 0.5-dB step 13 DAMS
Zero-detect status (read-only, I
2
C
N/A 14 ZERO[8:1]
interface only)
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Product Folder Link(s): PCM1680