AK7755EN_16 Datasheet, PDF (100/109 Pages) Asahi Kasei Microsystems – DSP with Mono ADC Stereo CODEC + Mic/Lineout Amp

[AK7755]
2. Interface
The input data channel of the DMDAT1/2 pin is set by DCLKP1/2 bit (CONT1E: D6/D3). When
DCLKP1/2 bit = “1”, L channel data is input to the decimation filter if the DMCLK1/2 pin= “H”, and R
channel data is input if the DMCLK1/2 = “L”. When DCLKP1/2 bit = “0”, R channel data is input to the
decimation filter while DMCLK1/2 pin= “H”, and L channel data is input while DMCLK1/2 pin= “L”.
The DMCLK1/2 pin only supports 64fs. It outputs “L” when DCLKE1/2 bit = “0”, and outputs 64fs clock
when DCLKE1/2 bit = “1”. The output data through “the Decimation and Digital Filters” is 24bit full
scale when the 1bit data density is 0%~100%.
DCLKP1 bit
0
1
DMCLK1 pin = “H”
Rch
Lch
DMCLK1 pin = “L”
Lch
(default)
Rch
DCLKP2 bit DMCLK2 pin = “H” DMCLK2 pin = “L”
0
Rch
Lch
(default)
1
Lch
Rch
Table 13. Data Input/Output Timing with Digital MIC
DMCLK1/2(64fs)
DMDAT1/2(Lch)
Valid
Data
Valid
Data
Valid
Data
Valid
Data
DMDAT1/2(Rch)
Valid
Data
Valid
Data
Valid
Data
Valid
Data
Figure 77. Data Input/Output Timing with Digital MIC (DCLKP1/2 bit = “1”)
DMCLK1/2(64fs)
DMDAT1/2(Lch)
Valid
Data
Valid
Data
Valid
Data
Valid
Data
DMDAT1/2(Rch)
Valid
Data
Valid
Data
Valid
Data
Valid
Data
Figure 78. Data Input/Output Timing with Digital MIC (DCLKP1/2 bit = “0”)
■ Digital Mixer
ADC output (SDATAD), ADC2 output (SDATAD2) and DSP-DOUT4 data can be mixed into a signle
serial data by a mixer circuit. SELMIX[2:0] bits (CONT09: D0, CONT08: D1, D0) control mixing
setting. Delay time of the mixer circuit is 4Ts (4/fs).
SELMIX
mode
SELMIX
[2:0]
MIXOUT Lch
MIXOUT Rch
0
000 SDOUTAD Lch
SDOUTAD Rch
1
001 SDOUTAD Lch/2 + SDOUTAD2 Lch/2 SDOUTAD Rch
2
010 SDOUTAD Lch
SDOUTAD Lch/2 + SDOUTAD2 Lch/2
3
011 SDOUTAD2 Lch
SDOUTAD2 Rch
4
100 DSP-DOUT4 Lch
SDOUTAD2 Rch
5
101 SDOUTAD2 Lch
DSP-DOUT4 Rch
6
110 DSP-DOUT4 Lch
SDOUTAD Rch
7
111 SDOUTAD Lch
DSP-DOUT4 Rch
Table 14. Digital Mixer Output Setting
(default)
014006643-E-00
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2014/10