SM5950BM

SEIKO NPC CORPORATION —1

Asynchronous Sample Rate Converter

OVERVIEW

The SM5950BM is a digital audio signal asynchronous sample rate converter LSI. It supports 16/20/24-bit

word-length input/output interface data. It also features a built-in digital deemphasis filter and direct mute

functions.

FEATURES

Functions

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L/R 2-channel (stereo) processing

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Input sample rate range: 20kHz to 100kHz

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Output sample rate range: 30kHz to 50kHz

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: 0.45 to 2.205 selectable

fso = output sample rate

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Asynchronous input and output clock timing

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System clock input

• Input system clock: 1fsi (LRCI)

• Output system clock: 512fso (SCKO input)

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Deemphasis filter function

• IIR-type filter

• fsi = 44.1kHz, 48kHz, 32kHz compatible

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Direct mute function

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Through mode operation

• Direct connection from input to output

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Output data clocks (LRCO, BCKO)

• Slave mode: external inputs

• Master mode: derived from the output system

clock (SCKO)

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Computation round-off processing

• Normal round-off

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5V tolerant input pins for direct connection to 5V

operation devices

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3.3V single supply

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Package: 24-pin SSOP

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

Weight: 0.23g

Note: Dimensions without tolerance are reference values.

Device

Package

SM5950BM

24-pin SSOP

24

23

22

21

20

19

18

17

16

15

14

13

LRCO

BCKO

DOUT

SLAVE

SCKO

VSS

IISO

OMOD0

OMOD1

TMOD1

THROU

DMUTE

10.20 ± 0.30

10.05 ± 0.20

0.36 ± 0.10

0.8

0.10

0 to 10

0.15 − 0.05

+ 0.10