WM8850
Pre-Production
ADC1 supports all common sample rates from 8kHz to 96kHz and data widths of 16, 20, 24 and 32-
bit (Float-32).
The sample rate and word length of the data captured by the ADC1 node is set using the Stream
Format Verb. Table 9 below shows the required settings for Base, Mult and Div as part of the Stream
Format Verb to obtain the required sample rate.
SAMPLE RATE
8kHz
BASE
0h
MULT
0h
DIV
5h
3h
2h
1h
1h
2h
0h
0h
0h
0h
11.025kHz
16kHz
1h
0h
0h
0h
22.05kHz
24kHz
1h
0h
0h
0h
32kHz
0h
1h
44.1kHz
48kHz
1h
0h
0h
0h
88.2kHz
96kHz
1h
1h
0h
1h
Table 9 ADC1 Supported Sample Rate Settings
Note: Other settings of Base, Mult and Div are reserved and should not be set.
The ADC1 output data is by default set to provide the captured waveform from the left channel in
Channel 0, and the right channel in Channel 1. It is possible to adjust this mapping using the vendor-
specific Channel Copy Verb.
SET VERB
BIT
BITFIELD
NAME
DEFAULT
DESCRIPTION
7B1h
1
CHAN1_
SEL
1
Channel 1 (right) Mapping Control:
0 = Channel 1 takes data from left audio
channel
1 = Channel 1 takes data from right audio
channel
0
CHAN0_
SEL
0
Channel 0 (left) Mapping Control:
0 = Channel 0 takes data from left audio
channel
1 = Channel 0 takes data from right audio
channel
PP, April 2011, Rev 3.2
42
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
