SM5950AM

NIPPON PRECISION CIRCUITS INC.—10

FUNCTIONAL DESCRIPTION

Input Interface Settings (IMOD0, IMOD1, IISI)

Input data format

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

Note: L = Low input level, H = high input level

Input timing

The input timing for each input format is shown in figures 4 to 8.

Output System Clock (SCKO)

A clock with frequency 512 times the output sampling frequency (fso) must be input on SCKO. In master

mode, the LRCO and BCKO output clocks are derived from the input clock on SCKO. It also functions as the

internal computation circuit system clock.

Output Interface Settings (OMOD0, OMOD1, IISO, THROU, SLAVE)

Output data format

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

Note: L = Low input level, H = high input level

Output mode select

Output timing

The timing for each output format is shown in figures 9 to 13. In slave mode, the input timing of LRCO and

BCKO for each output format is shown in figures 9 to 13. In through mode, the LRCI, BCKI, and DI inputs are

fed through to the outputs regardless of the output data format settings.

IMOD0

IMOD1

IISI

Format

L

L

L

16-bit MSB-first right-justified

H

L

L

20-bit MSB-first right-justified

L

H

L

24-bit MSB-first right-justified

H

H

L

MSB-first left-justified (leading 16 bits valid data)

H or L

H or L

H

IIS (leading 16 bits valid data)

OMOD0

OMOD1

IISO

Format

L

L

L

16-bit MSB-first right-justified

H

L

L

20-bit MSB-first right-justified

L

H

L

24-bit MSB-first right-justified

H

H

L

MSB-first left-justified (16-bit output)

H or L

H or L

H

IIS (16-bit output)

Pin setting

Function

THROU

SLAVE

Mode

Description

LRCO, BCKO

L

L

Master

LRCO and BCKO are derived form SCKO.

Function as outputs

H

Slave

LRCO and BCKO are supplied externally.

Function as inputs

H

H or L

Through

LRCO, BCKO, and DOUT are connected directly to

LRCI, BCKI, and DI inputs.

Note: DMUTE is valid.

Function as outputs