Datasheet

ADAU1701 Data Sheet
Rev. C | Page 36 of 52
2057 TO 2060 (0x0809 TO 0x080C)—AUXILIARY
ADC DATA REGISTERS
These registers hold the data generated by the 4-channel
auxiliary ADC. The ADCs have eight bits of precision and can
be extended to 12 bits if filtering is selected via Bits FIL[1:0] of
the auxiliary ADC and power control register. The SigmaDSP
program reads this data as a 1.11 format data-word with a range
of 0 to 1.0. This data-word is mapped to the 5.23 format
parameter word with the four MSBs and 12 LSBs set to 0. A
full-scale code of 255 results in a value of 1.0. These registers
can be written to directly if the auxiliary ADC data registers
control port write mode (AACW) bit is set in the DSP core
control register.
Table 36. Auxiliary ADC Data Register Bit Map
D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 Default
0 0 0 0 AA11 AA10 AA09 AA08 AA07 AA06 AA05 AA04 AA03 AA02 AA01 AA00 0x0000
Table 37.
Bit Name Description
AA[11:0] Auxiliary ADC output data, MSB first