SM5844 datasheet(12/26 Pages) NPC

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SM5844AF

NIPPON PRECISION CIRCUITS—12

FUNCTIONAL DESCRIPTION

Input Data Interface (DI, LRCI, BCKI, IFM1, IFM2)

Attenuator and Deemphasis Selection

The attenuator is set using the microcontroller

interface. When the attenuator is used, deemphasis

settings also need to be set using the microcontroller

interface. The microcontroller interface comprises

MDT, MCK and MLEN, and is used to receive all

input serial data.

When MCOM is HIGH, serial data received on

MDT, MCK and MLEN sets the attenuation data and

control ﬂag data.

When MCOM is LOW, the logic levels on FSI1,

FSI2 and DEEM select the device function.

Mode

IFM1

IFM2

W ord length

Data position

Data

sequence

Common f eatures

L O W

16 bits

Rear packe d

MSB ﬁrst

Non IIS

L/R alternating

Bit serial

L O W

HIGH

20 bits

HIGH

L O W

Front packe d

HIGH

Rear packe d

LSB ﬁrst

Table 1. Attenuator and deemphasis function

selection

Function

Function set method

External pins

(MCOM = LOW )

Microcontroller

interface ﬂags

(MCOM = HIGH)

Deemphasis

ON/OFF

DEEM

FDEEM

Deemphasis

frequency (fsi)

select

FSI1, FSI2

FFSI1, FFSI2

Attenuator data set

N/A (no attenuation)

11 bits (a1 to a11)

Test mode select

Irreversible

(test mode 1)

FTST1, FTST2

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