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AK4527B Просмотр технического описания (PDF) - Asahi Kasei Microdevices

Номер в каталогеКомпоненты Описаниепроизводитель
AK4527B High Performance Multi-channel Audio CODEC AKM
Asahi Kasei Microdevices AKM
AK4527B Datasheet PDF : 33 Pages
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ASAHI KASEI
[AK4527B]
LRCK
fs
32.0kHz
44.1kHz
48.0kHz
88.2kHz
96.0kHz
MCLK (MHz)
256fs
512fs
-
16.3840
-
22.5792
-
24.5760
22.5792
-
24.5760
-
Sampling
Speed
Normal
Double
Table 5. System Clock Example (Auto Setting Mode)
n De-emphasis Filter
The AK4527B includes the digital de-emphasis filter (tc=50/15µs) by IIR filter. This filter corresponds to three sampling
frequencies (32kHz, 44.1kHz, 48kHz). De-emphasis of each DAC can be set individually by register data of DEMA1-C0
(DAC1: DEMA1-0, DAC2: DEMB1-0, DAC3: DEMC1-0, see “Register Definitions”).
Mode
0
1
2
3
4
5
6
7
Sampling Speed
Normal Speed
Normal Speed
Normal Speed
Normal Speed
Double Speed
Double Speed
Double Speed
Double Speed
DEM1
0
0
1
1
0
0
1
1
DEM0
0
1
0
1
0
1
0
1
DEM
44.1kHz
OFF
48kHz
32kHz
OFF
OFF
OFF
OFF
Default
Table 6. De-emphasis control
n Digital High Pass Filter
The ADC has a digital high pass filter for DC offset cancel. The cut-off frequency of the HPF is 0.9Hz at fs=44.1kHz and
also scales with sampling rate (fs).
n Audio Serial Interface Format
Four serial data modes can be selected by the DIF0 and DIF1 pins (P/S = “H”) or bits (P/S = “L”) as shown in Table 7. In
all modes the serial data is MSB-first, 2’s compliment format. The SDTO is clocked out on the falling edge of BICK and
the SDTI/DAUX are latched on the rising edge of BICK.
Figures 14 shows the timing at SDOS = “L”. In this case, the SDTO outputs the ADC output data. When SDOS = “H”,
the data input to DAUX is converted to SDTO’s format and output from SDTO. Mode 2 and mode 3 in SDTI/DAUX
input formats can be used for 16-20bit data by zeroing the unused LSBs.
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
0
1
0
1
SDTO
24bit, MSB justified
24bit, MSB justified
24bit, MSB justified
24bit, IIS (I2S)
SDTI1-3, DAUX
20bit, LSB justified
24bit, LSB justified
24bit, MSB justified
24bit, IIS (I2S)
LRCK
H/L
H/L
H/L
L/H
Default
Table 7. Audio data formats
MS0056-E-00
- 15 -
2000/10
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