PCM1725USLASH2K datasheet(6/15 Pages) TI2

6 / 15 page

PCM1725

FIGURE 1. “Normal” Data Input Timing.

FIGURE 2. “I2S” Data Input Timing.

LRCKIN

BCKIN

DIN

1.4V

BCH

BCL

BCKIN Pulse Cycle Time

BCKIN Pulse Width High

BCKIN Pulse Width Low

BCKIN Rising Edge to LRCIN Edge

LRCIN Edge to BCKIN Rising Edge

DIN Set-up Time

DIN Hold Time

: t

BCY

: t

BCH

: t

BCL

: t

: 100ns (min)

: 50ns (min)

: 30ns (min)

BCY

FIGURE 3. Audio Data Input Timing.

SYSTEM CLOCK

The system clock for PCM1725 must be either 256fS or

384fS, where fS is the audio sampling frequency (LRCIN),

typically 32kHz, 44.1kHz or 48kHz. The system clock is

used to operate the digital filter and the noise shaper. The

system clock input (SCKI) is at pin 14. Timing conditions

for SCKI are shown in Figure 4.

System Clock Pulse Width High

tSCKIH

13ns (min)

System Clock Pulse Width Low

tSCKIL

13ns (min)

SCKIH

SCKI

SCKIL

2.0V

0.8V

FIGURE 4. System Clock Timing Requirements.

1/fs

L_ch

R_ch

MSB

LSB

LRCIN (pin 1)

BCKIN (pin 3)

AUDIO DATA WORD = 16-BIT

DIN (pin 2)

MSB

LSB

1/fs

L_ch

R_ch

MSB

LSB

LRCIN (pin 1)

BCKIN (pin 3)

AUDIO DATA WORD = 16-BIT

DIN (pin 2)

MSB

LSB

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