AK4687 AKM [Asahi Kasei Microsystems], AK4687 Datasheet - Page 14

• Manufacturer Part Number: AK4687
• Description: Asynchronous Stereo CODEC with Capless Stereo Selector
• Manufacturer: AKM [Asahi Kasei Microsystems]

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The MSN pin controls master/slave mode of the PORT1. The PORT2 supports slave mode only. In master mode, LRCK1
and BICK1 pins are output pins. In slave mode, LRCK1 (LRCK2) and BICK1 (BICK2) pins are input pins
■
In master mode (MSN pin = “H”), the required clock is MCLK1. The CKS1-0 bits and the CKS pin select the clock
frequency
In slave mode (MSN pin = “L”), required clocks are MCLK1, BICK1 and LRCK1. The master clock (MCLK1) must be
synchronized with LRCK1 but the phase is not critical. After exiting reset following power-up (PDN1 pin = “L” → “H”),
the ADC of AK4687 is in power down state until MCLK1, LRCK1 and BICK1 are input.
The ADC only supports Normal Speed Mode (fs = 32k ~ 48kHz).
MS1307-E-00
Master/Slave Mode
PORT1 (ADC) Clock Control
(Table
32.0kHz
44.1kHz
48.0kHz
LRCK1
Fs
6,
Table 7. PORT1(ADC) Master Clock Control (Master Mode, H/W Control Mode)
Table 6. PORT1(ADC) Master Clock Control (Master Mode, I
Table
MSN pin
7). The ADC is in power-down state until MCLK1, BICK1 and LRCK1 are supplied.
CKS1 bit
H
L
11.2896
12.2880
8.1920
0
0
1
1
256fs
Table 8. PORT1(ADC) System Clock Example
Output “L”(master mode)
CKS pin
CKS0 bit
Input (slave mode)
H
L
Table 5. Master/Salve Mode
BICK1, LRCK1
12.2880
16.9344
18.4320
PORT1 (ADC)
0
1
0
1
384fs
MCLK1 (MHz)
- 14 -
Clock Speed
16.3840
22.5792
24.5760
512fs
Clock Speed
256fs
768fs
256fs
384fs
512fs
768fs
Input (slave mode)
Input (slave mode)
BICK2, LRCK2
PORT2 (DAC)
24.5760
33.8688
36.8640
768fs
2
C Control Mode)
(default)
BICK1 (MHz)
2.0480
2.8224
3.0720
64fs
(Table
[AK4687]
2011/05
5).