ak4665a AKM Semiconductor, Inc., ak4665a Datasheet - Page 13

• Manufacturer Part Number: ak4665a
• Description: 20-bit Stereo Codec With Mic/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The external clocks required to operate the AK4665A are MCLK (256fs/512fs), LRCK (fs) and BICK. The master clock
(MCLK) should be synchronized with sampling clock (LRCK). The phase between these clocks does not matter. The
sampling frequency is selected by FS3-0 bits (refer to Table 1). The frequency of MCLK is detected automatically, and
the internal master clock becomes the appropriate frequency. Table 2 shows system clock example.
External clocks (MCLK, BICK and LRCK) are needed to operate ADC, DAC, ALC2 or HP-Amp. External clocks are
also needed for each path setting of HP-Amp (DACHL, LINHL, MINHL, DACHR, RINHR, MINHR and HPMTN bits)
and Lineout (DACL, LINL, MINL, DACR, RINR and MINR bits) when MOFF8 bit = “0” or MOFF9 bit = “0”. All
external clocks (MCLK, BICK and LRCK) should always be present whenever ADC, DAC, ALC2 or HP-Amp is in
normal operation mode (PMADC bit = “1”, PMDAC bit = “1”, PMLO=ALC2 bits = “1” or PMCP=PMHPL=PMHPR
bits = “1”). If these clocks are not provided, the AK4665A may draw excess current and will not operate properly because
it utilizes these clocks for internal dynamic refresh of registers. If the external clocks are not present, the AK4665A
should be placed in power-down mode (PDN pin = “L” or PMADC=PMDAC=ALC2=PMCP=PMHPL=PMHPR bits =
“0”).
MS0440-E-01
System Clock
11.025kHz
22.05kHz
44.1kHz
FS3
LRCK
12kHz
16kHz
24kHz
32kHz
48kHz
8kHz
0
0
0
1
1
1
1
1
1
fs
FS2
0
0
0
0
0
0
1
1
1
Others
Table 2. Systems Clock Example
OPERATION OVERVIEW
Table 1. Sampling Frequency
11.2896
5.6448
12.288
2.8224
256fs
2.048
3.072
4.096
6.144
8.192
FS1
0
0
0
0
0
1
0
1
1
MCLK (MHz)
- 13 -
FS0
0
1
0
0
1
0
0
1
0
11.2896
22.5792
5.6448
12.288
16.384
24.576
512fs
4.096
6.144
8.192
11.025kHz
22.05kHz
44.1kHz
32kHz
48kHz
16kHz
24kHz
12kHz
8kHz
N/A
fs
BICK (MHz)
Default
0.7056
1.4112
2.8224
0.512
0.768
1.024
1.536
2.048
3.072
64fs
[AK4665A]
2006/05