Discontinued Products are limited to existing inventory.
The SM5921A is an SDRAM controller LSI for audio applications. It stores 64-fs slot 3-wire serial format audio data input at sampling frequency fs in SDRAM, and can access data at an arbitrary address to add a delay to each channel data. It also has a direct mute function to mute the audio data. Operating voltage is 3 to 3.6V and is supplied in 64-pin QFP
Key Features
System clock input
64fs (fs = 32 to 192kHz) bit clock
Sampling frequency : fs = 32 to 192kHz support
Data input/output
3-wire serial, 8-channel PCM
64 clock/slot, word clock polarity inversion
Direct mute function
MCU interface : 3-wire serial
Delay settings : sum of intrinsic delay and individual delay
Intrinsic delay (common to all channels, default = 0 samples, 16-sample units)
Individual delay (independent for each channel, default = 0 samples, 1-sample units)
Maximum delay values
1365.3ms @ fs = 48kHz
682.7ms @ fs = 96kHz
341.3ms @ fs = 192kHz
Address shift function :x1, x2, x4 support
Delay time can be multiplied between x1, x2, or x4 times without changing the delay set value.
SM5921A.pdf