OVERVIEW

The SM5849BF is a digital audio signal, asynchronous sample rate converter LSI. It supports 16/20/24-bit word length input data, 16/20/24-bit word length output data, 2kHz to 100kHz input sample rate range, and 4kHz to 200kHz output sample rate range. It also features a built-in digital deemphasis filter and digital attenuator.

FEATURES

Filter Characteristics and Converter Efficiency

■ 24-bit internal data word length

■ Deemphasis filter characteristics (IIR filter)

• ±0.03dB gain deviation from ideal filter characteristics

■ Anti-aliasing LPF characteristics

• Output/input sample rate conversion ratio auto matic filter select (6 FIR filters)

- Up converter LPF 1.0 to 2.2 times

- Down converter LPF I 0.92 times: 48.0 to 44.1kHz

- Down converter LPF II 0.73 times: 44.1 to 32.0kHz

- Down converter LPF III 0.67 times: 48.0 to 32.0kHz

- Down converter LPF IV 0.5 times: 48.0 to 24.0kHz

- Down converter LPF V 0.45 times: 48.0 to 22.1kHz

• ±0.00005dB passband ripple

• > 110dB stopband attenuation

■ Converter noise levels

• ≤ −110dB internal calculation (quantization) noise

• −98dB (16-bit output), −122dB (20-bit output), and −146dB (24-bit output) word rounding noise

■ Output S/N ratio (theoretical values) Interfaces

■ Input data format

• 2s-complement, L/R alternating, serial

• IIS/non-IIS format

■ Output data format

• 2s-complement, MSB first, L/R alternating, serial

• Continuous bit clock

APPLICATIONS

■ Digital audio equipment-interface sample rate conversion (AV amplifiers, CD-R, DAT, MD and 8mm VTRs)

■ Commercial recording/editing equipment sample rate conversion