SM5956AF datasheet(21/27 Pages) NPC

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SM5956A

SEIKO NPC CORPORATION —21

Group Propagation Delay

tINPUT

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

tOUTPUT : Serial output data (fso rate) output start timing (LRCO clock rising edge)

Cratio

: Sample rate conversion ratio (fsi/fso)

tOUTPUT − tINPUT = ((51.791 × Cratio + 41.557) ± 36)/fso (at SCKSLN = H, 768fso operation)

tOUTPUT − tINPUT = ((51.122 × Cratio + 38.647) ± 36)/fso (at SCKSLN = L, 512fso operation)

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

44.1

594

285

557

263

44.1

822

406

44.1

473

228

799

403

44.1

478

302

447

395

44.1

325

287

298

264

Serial data input

1/fsi

tINPUT

1/fso

Serial data output

t OUTPUT

tINPUT

t OUTPUT −

tINPUT

t OUTPUT −

t OUTPUT

tINPUT

Data waveform image

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