AK7714 Datasheet, PDF (27/48 Pages) Asahi Kasei Microsystems – 20-Bit Audio Codec with DSP and Delay RAM

[ASAHI KASEI]
[AK7714]
(5) Audio data interface (internal connection mode )
The serial audio data pins SDIN1, SDIN2 and SDOUT (OPCL = L: Internal connection mode) are interfaced with the
external system, using LRCLK and BITCLK. The data format is the first MSB of the 2's complement. Normally, the
input/output format, in addition to the standard format used by AKM, can be changed to the I2S compatible mode by
setting the control register C0 to 1. (In this case, all input/output audio data pin interface is in the I2S compatible mode.)
The input SDIN1 and SDIN2 formats are adjusted (24 bits) at initialization. Setting the control registers C2 and C1 will
cause them to be compatible with 24 bits, 20 bits and 16 bits. (Note: C0 = 0)
However, inidividul setting of SDIN1 and SDIN2 is not allowed.
The output SDOUT is fixed at 24 bits.
At slave mode BITCLK corresponds to not only 64fs but also 48fs. But, we recommend 64fs. Following formats
describe 64fs examples.
1) Standard input format (C0 = 0: initial set value)
a) Mode 1 (C2, C1 = 0, 0: Initial set value)
• When you want to input the MSB-first 20-bit data into SDIN1 and 2, input four "0s" following the LSB.
b) Mode 2, Mode 3 and Mode 4
SDIN1, 2
Mode 4
SDIN1 and 2
SDIN1 and 2
SDIN1 and 2
Mode 2: (C2, C1) = (0, 1) 24 bits
Mode 3: (C2, C1) = (1, 0) 20 bits
Mode 4: (C2, C1) = (1, 1) 16 bits
M0018-E-00
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