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AK2301A

3.3V Single channel PCM CODEC LSI

Asahi Kasei Microdevices 

ASAHI KASEI

AK2301A

CIRCUIT DESCRIPTION

BLOCK

AMPT

AMPR

AAF

CODEC

A/D

CODEC

D/A

SMF

BGREF

PCM I/F

AMP1、AMP2

FUNCTION

Op-amp for input gain adjustment. This op-amp is used as an inverting or

differential amplifier. Adjusting the gain with external resistors. The resistor

should be larger than 10kΩ for the feedback resistor.

VFTN: Negative op-amp input.

VFTP: Positive op-amp input.

GST: Op-amp output.

Op-amp for output gain adjustment. This op-amp is used as an inverting

amplifier. Adjusting the gain with external resistors. The combined resistor larger

than 8kΩ is recommended for the feedback and the output load

VFR: Negative op-amp input.

GSR: Op-amp output.

VR and GSR can be used as the differential output.

Integrated anti-aliasing filter which prevents signals around the sampling rate

from folding back into the voice band. AAF is a 2nd order RC active low-pass filter.

Converting the analog signal to 14bit PCM data.

The band limiting filter is also integrated.

Converting the 14bit PCM data from the DR to the analog signal.

Output of the D/A converter is fed into the SMF to suppress the high frequency

element.

Extracts the inband signal from D/A output. It also corrects the sinx/x effect of the

D/A output.

Provide the stable analog ground voltage using an on-chip band-gap reference

circuit which is temperature compensated. The output voltage is 1.5V for 3.3V

An external capacitor of 1.0uF or larger should be connected between VREF and

VSS to stabilize analog ground (VREF). Please do not connect external load to

this pin. TAGND pin is used as the analog ground level output for the AMPT. An

external capacitor of 1.0uF or larger should be connected between TAGND and

VSS to stabilize analog ground.

For the PCM data rate, both 256kHz or 512kHz are available.

The 14bit PCM data is input/output by the 2’s compliment 16bit serial data

format. Two kinds of serial data format (Long Frame/Short Frame) are available.

Each data format is automatically detected by AK2301A.

PCM data is input to DR pin and output from DX pin.

Universal op-amp for the filter of the external voice path.

The maximum load is 8kΩ (including the feedback resistor and AC load).

These op-amps are assumed as using for the inverting LPF with 20kHz cut off

frequency.

<MS0300-E-00>

12

2004/3

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