AK5703EN datasheet(38/76 Pages) AKM

Part #	AK5703EN

Description	4-Channel 24-bit ADC with PLL & MIC-AMP

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Manufacturer	AKM [Asahi Kasei Microsystems]

Direct Link	http://www.akm.com

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38 / 76 page

[AK5703]

MS1537-E-00

2013/05

- 38 -

■ Mono/Stereo Mode (MIXA/B)

PMADAL, PMADAR and MIXA bits select mono or stereo mode of ADCA output data. PMADBL, PMADBR and

MIXB bits select mono or stereo mode of ADCB output data. ALC operation (ALCA/B or ALC4 bit = “1”) or digital

volume operation (ALCA/B = ALC4 bits = “0”) is applied to the data in Table 27 and Table 28.

PMADAL

bit

PMADAR

bit

MIXA

bit

ADCA Lch data

ADCA Rch data

0

x

All “0”

(default)

0

1

x

Rch Input Signal

1

0

x

Lch Input Signal

0

Lch Input Signal

Rch Input Signal

1

(L+R)/2

Table 27. ADCA Mono/Stereo Mode (x: Don’t care)

PMADBL

bit

PMADBR

bit

MIXB

bit

ADCB Lch data

ADCB Rch data

0

x

All “0”

(default)

0

1

x

Rch Input Signal

1

0

x

Lch Input Signal

0

Lch Input Signal

Rch Input Signal

1

(L+R)/2

Table 28. ADCB Mono/Stereo Mode (x: Don’t care)

■ High Pass Filter (HPF2A/B)

This is composed 1st order HPF. The coefficient of HPF2A is set by FA1A13-0 bits and FA1B13-0 bits. The coefficient

of HPF2B is set by FB1A13-0 bits and FB1B13-0 bits. HPF2A bit controls ON/OFF of the HPF2A and HPF2B bit

controls ON/OFF of the HPF2B. When the HPF2A/B is OFF, the audio data passes this block by 0dB gain. The

coefficient must be set when HPFA = HPF2B bits = “0”. The HPF2A/B starts operation 4/fs(max) after when HPF2A bit

= “1” (HPF2B bit = “1”) is set.

fs: Sampling frequency

fc: Cut-off frequency

Register setting (Note 30)

HPF: Fx1A[13:0] bits =A, Fx1B[13:0] bits =B

(MSB=Fx1A13, Fx1B13; LSB=Fx1A0, Fx1B0)

A =

1 / tan (

πfc/fs)

1 + 1 / tan (

πfc/fs)

B =

1

− 1 / tan (πfc/fs)

1 + 1 / tan (

πfc/fs)

,

Transfer function

H(z) = A

1

− z −1

1 + Bz −1

The cut-off frequency must be set as below.

fc/fs

≥ 0.0001 (fc min = 4.41Hz at 44.1kHz)

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