OVERVIEW
The SM5844AF is a digital audio signal, asynchronous sample rate converter LSI. It reads 16 or 20-bit word length input data, and writes 16, 18, or 20-bit word length output data. It also features a built-in digital deemphasis filter and digital attenuator.
The SM5844AF operates from a 5 V supply, and is available in 44-pin QFPs.
FEATURES
Functions
â Left/right-channel processing (stereo)
â Input sample rate (fsi) ranges
⢠24 to 48 kHz (256fsi mode)
⢠27 to 55 kHz (384fsi mode)
â Output sample rate (fso) range
⢠20 to 100 kHz
â Sample rate conversion ratio (fso/fsi)
⢠0.5 to 2.0 times
â Asynchronous input and output timing (clock inputs)
â System clock inputs (input and output clocks independent)
⢠256fsi or 384fsi input system clock
⢠256fso or 384fso output system clock
â Deemphasis filter
⢠IIR-type filter
⢠44.1, 48 or 32 kHz
â Digital attenuator
⢠11-bit data for 1025 levels
⢠Smooth, incremental attenuation change
⢠+12 dB gain shift function
â Direct mute function
â Through mode operation
⢠Input to output direct
â Output data clocks (LRCO, BCKO)
⢠External input (slave mode)
⢠Output system clock generated internally (master mode)
â CMOS-level input/outputs
â 5 V (standard) single supply
â 44-pin QFP
â Molybdenum-gate CMOS process
APPLICATIONS
â Digital audio equipment, sample rate conversion (audiovisual amplifiers, CD-R, DAT, MD and 8 mm VTRs)
â Commercial recording/editing equipment, sample rate conversion
â Input data jitter elimination
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