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ASAHI KASEI
www.DataSheet4U.com
[AK4121]
AK4121
Asynchronous Sample Rate Converter
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 I2S 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
PDN DEM0 DEM1 SMUTE TVDD VDD DVSS
(MCLK) SDTI ILRCK IBICK SDTO OLRCK OBICK
Serial Audio I/F
De-em filter
Sample Rate Converter
soft mute
Serial Audio I/F
CMODE2 AVSS FILT PLL CMODE1 CMODE0
IDIF2
IDIF1
IDIF0
ODIF1
ODIF0
MS0191-E-03 -1-
2004/08
ASAHI KASEI
www.DataSheet4U.com
[AK4121]
Ordering Guide
AK4121VF AKD4121 −40 ∼ +85°C 24pin VSOP (0.65mm pitch) Evaluation Board for AK4121
Pin Layout
FILT AVSS PDN SMUTE DEM0 DEM1 ILRCK IBICK SDTI IDIF0 IDIF1 IDIF2
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
VDD DVSS TVDD MCLK OLRCK OBICK SDTO ODIF1 ODIF0 CMODE2 CMODE1 CMODE0
Top View
Major Difference between AK4120 and AK4121
Items MCLK Input AK4120 Needed (supports 256/512fs) AK4121 NOT Needed (Slave mode) / Needed (Master Mode: supports 256/384/512/768fs) 96kHz 3.0V ~ 3.6V O O O X X
Input sample rate (max) Vdd Input 5V Tolerant De-emphasis Filter Soft Mute Digital Volume Digital Mixer
48kHz 2.7V ~ 3.6V X X X O O
MS0191-E-03 -2-
2004/08
ASAHI KASEI
www.DataSheet4U.com
[AK4121]
PIN/FUNCTION
No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Name FILT AVSS PDN SMUTE DEM0 DEM1 ILRCK IBICK SDTI IDIF0 IDIF1 IDIF2 CMODE0 CMODE1 CMODE2 ODIF0 ODIF1 SDTO OBICK OLRCK MCLK TVDD DVSS VDD I/O O I I I I I I I I I I I I I I I I O I/O I/O I I I I Function Loop-Filter Pin for PLL Analog Ground Pin Power-Down pin When “L”, the AK4121 is powered-down and reset. Soft Mute Pin De-emphasis Filter Control Pin #0 De-emphasis Filter Control Pin #1 L/R Clock Pin for Input Audio Serial Data Clock Pin for Input Audio Serial Data Input Pin Input Data Format pin #0 Input Data Format pin #1 Input Data Format pin #2 Clock Mode Select Pin #0 Clock Mode Select Pin #1 Clock Mode Select Pin #2 Output Data Format pin #0 Output Data Format pin #1 Audio Serial Data Output Pin Audio Serial Data Clock Pin for Output L/R Clock Pin for Output Master Clock Pin for Output Input Buffer Power Suppl.