AK4120 Datasheet, PDF (13/30 Pages) Asahi Kasei Microsystems – Sample Rate Converter with Mixer and Volume

ASAHI KASEI
[AK4120]
OPERATION OVERVIEW
n I/O Data flow
The AK4120 has two input audio data interfaces (Input#1 and Input#2). The AK4120 has four modes of operation, each
corresponding to a different internal audio path as shown in Table 1. These path modes are selected by the PATH1-0
bits.
Path Mode
0
(see Figure 3)
1
(see Figure 4)
2
(see Figure 5)
3
(see Figure 6)
PATH1-0 bits
“00”
“01”
“10”
“11”
Output Data
The sample rate of Input#1 data is converted by SRC block. This converted
data paths through Volume#1 and Input#2 data is paths through Volume#2.
These data are mixed and this mixed data is output. The sample rata of
Input#1 is defined by IMCLK1 and the sample rate of Output data is
defined by OMCLK. The sample rate of Input#2 should be same as Output
data.
The sample rate of Input#2 data is converted by SRC block. This converted
data volume is controlled by Volume#1 and this data is output. The sample
rata of Input#2 is defined by IMCLK2 and the sample rate of Output data is
defined by OMCLK.
Input#1 data paths through Volume#2 and is output. Output data should
synchronous with IMCLK.
Input#2 data paths through Volume#2 and is output. Input#2 should
synchronous with OMCLK.
Table 1. Path Mode
Note: When Path Mode is changed, the AK4120 should be powered down using the “PW” bit
MS0134-E-00
- 13 -
2002/1