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
2
S
† 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 ODIF0IDIF2
CMODE0
SMUTE
CMODE1
AVSS
FILT
TVDD
CMODE2
soft
mute



Asynchronous Sample Rate Converter
AK4121