SM5956A

SEIKO NPC CORPORATION —21

Group Propagation Delay

: Serial input data (fsi rate) read end timing (LRCI clock rising edge)

Cratio

: Sample rate conversion ratio (fsi/fso)

Response Time

A certain amount of time is required to calculate the sample rate conversion ratio in the conversion rate detec-

tor. Assuming as a prerequisite that the SM5956A is supplied with a stable input-system sampling frequency

(fsi: input on LRCI) and a stable output-system sampling frequency (fso: derived from the SCK clock), the

time required after system reset to determine the sample rate conversion ratio with 16-bit precision is defined as

the minimum response time, given by:

Response time = 28140/fso (638ms at fso = 44.1kHz)

Input frequency

fsi [kHz]

Output frequency

fso [kHz]

Response time [ms]

SCKSLN = L

SCKSLN = H

32

44.1

594

285

32

48

557

263

44.1

32

822

406

44.1

48

473

228

48

32

799

403

48

44.1

478

302

32

32

447

395

44.1

44.1

325

287

48

48

298

264

Serial data input

1/fsi

1/fso

Serial data output

Data waveform image