ASAHI KASEI

[AK4121]

MS0191-E-03

2004/08

- 1 -

GENERAL DESCRIPTION

AK4121 is a stereo asynchronous sample rate converter. The input sample rate ranges from 8kHz to

96kHz. The output sample rate is 32kHz, 44.1kHz, 48kHz or 96kHz. Using the AK4121 simplifies

system design, since the AK4121’s internal PLL eliminates the need for a master clock in slave mode.

Then the AK4121 is suitable for applications requiring multiple sample rates, such as Car Audio, DVD

recorders, and digital audio recording.

FEATURES

Stereo asynchronous sample rate converter

Input sample rate range (FSI): 8kHz to 96kHz

Output sample rate (FSO): 32kHz/44.1kHz/48kHz/96kHz

Input to output Sample rate ratio: FSO/FSI = 0.33 to 6

THD+N: –113dB

I/F format: MSB justified, LSB justified (24/20/16bit) and I

Clock for Master mode: 256/384/512/768fso

De-emphasis filter: 32kHz/44.1kHz/48kHz

SRC Bypass mode

Soft Mute function

Power Supply: VDD: 3.0 to 3.6V, TVDD: 3.0 to 5.5V (for input tolerant)

Ta: –40 to +85

°C

Serial

Audio

I/F

Sample

Rate

Converter

Serial

Audio

I/F

ILRCK

IBICK

SDTI

OLRCK

OBICK

SDTO

(MCLK)

PDN

IDIF1

VDD

DVSS

PLL

De-em

filter

DEM0

DEM1

IDIF0

ODIF1

ODIF0

IDIF2

CMODE0

SMUTE

CMODE1

AVSS

FILT

TVDD

CMODE2

soft

mute

Asynchronous Sample Rate Converter

AK4121