SM5847AF datasheet(18/30 Pages) NPC

18 / 30 page

SM5847AF

NIPPON PRECISION CIRCUITS—18

System Reset (RSTN)

During normal device operation, reset signals are not

required. However, the SM5847AF must be reset

under the following conditions.

At power-ON

When the LRCI clock and internal operation tim-

ing need to be resynchronized in jitter-free mode.

After the LRCI or XTI clocks, or both, stop and

are subsequently started.

The system is reset by applying a LOW-level pulse

on RSTN.

When RSTN is LOW, the DOL and DOR outputs are

tied LOW, muting the output signal to an attenuation

level of

−∞.

After system reset, when RSTN goes HIGH, the

arithmetic and output timing counters are reset on

the ﬁrst LRCI start edge, assuming that the XTI and

LRCI input clocks have already stabilized. The LRCI

start edge is determined by the state of INF1N and

INF2N. When INF1N is LOW or when both INF1N

and INF2N are HIGH, the start edge is the rising

edge. When INF1N is HIGH and INF2N is LOW, the

start edge is the falling edge.

Table 6. Master clock frequency example

Sampling

frequency

fs (kHz)

XTI system clock frequency (MHz)

CKSLN = HIGH (192fs)

CKSLN = LOW (256fs)

CKD V 1

CKD V 2

CKD V 1

CKD V 2

CKD V 1

CKD V 2

CKD V 1

CKD V 2

CKD V 1

CKD V 2

CKD V 1

CKD V 2

L O W

HIGH

L O W

HIGH

L O W

192fs

384fs

768fs

256fs

512fs

1024fs

3 2

6.144

12.288

24.576

8.192

16.384

32.768

44.1

8.4627

16.9344

33.8688

11.2896

22.5792

45.1584

4 8

9.216

18.432

36.864

12.288

24.576

49.152

88.2

16.9344

33.8688

Not guaranteed1

1. Refer to the AC characteristics system clock ratings.

22.5792

45.1584

Not guaranteed

9 6

18.432

36.864

Not guaranteed

24.576

49.152

Not guaranteed

176.4

33.8688

Not guaranteed

1 9 2

36.864

Not guaranteed

Not guaranteed1

Not guaranteed

Figure 5. System reset timing and output muting (INF1N = LOW or INF1N = INF2N = HIGH)

LRCI

RSTN

WCKO

OMD=H

8fs

RSTN=L

OMD=L

4fs

DOL/DOR

zero

Internal reset

SM5847AF датащи(PDF) 18 Page - Nippon Precision Circuits Inc

SM5847AF датащи(HTML) 18 Page - Nippon Precision Circuits Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

датащи скачать

ссылки URL