SM5865AM datasheet(11/17 Pages) NPC

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SM5865AM

NIPPON PRECISION CIRCUITS—11

System Clock Divider (CKDVN)

The SM5865AM has a built-in divide-by-2 system

clock frequency divider. The divider enables the

internal system clock to operate at half the input fre-

quency, for example when the external master clock

input frequency is high.

System Reset (RSTN)

The device should be reset in the following cases.

At power ON

When the system clock CKI stops, or other abnor-

malities occur.

The device is reset by applying a LOW-level pulse

on RSTN.

Audio Data Input (DI, BCKI, WCKI, IWSL)

Input data format

The audio data is input in MSB-ﬁrst, 2s-comple-

ment, 24-bit/20-bit serial format. The input word bit

length is selected by IWSL, 24-bit when HIGH or

open circuit, and 20-bit when LOW.

Jitter-free function

Serial input data bits on DI are read into an SIPO

rising edge of the bit clock BCKI where the serial

data is converted into parallel data. The internal par-

allel data control timing is derived from the system

clock, and is not affected by any jitter on the input

data clocks (WCKI and BCKI). After a reset opera-

tion is released when RSTN goes HIGH, the internal

timing and the WCKI input timing are phase com-

pared on the ﬁrst and subsequent WCKI falling

edges and the comparison result is used to perform

timing adjustment to maintain the word boundary

relationship between the internal timing and the

WCKI clock.

88.2 kHz

11.2896 MHz (128fs)

16fs

88.2 kHz

16.9344 MHz (192fs)

24fs

88.2 kHz

22.5792 MHz (256fs)

32fs

88.2 kHz

33.8688 MHz (384fs)

48fs

96 kHz

12.288 MHz (128fs)

16fs

96 kHz

18.432 MHz (192fs)

24fs

96 kHz

24.576 MHz (256fs)

32fs

96 kHz

36.864 MHz (384fs)

48fs

192 kHz

24.576 MHz (128fs)

16fs

192 kHz

36.864 MHz (192fs)

24fs

1. When CKDVN = LOW, the system clock frequency fCKI is halved, so the values shown are half the input frequency required for the same sampling rate

and internal factors.

Table 2. System clock frequencies (CKDVN = HIGH)

System clock frequency1

fCKI

Noise shaper operating

rate

Internal factor

(8fs input)

Internal factor

(4fs input)

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