www.ti.com

30 k

Ω

VINR

VCOM

3

21

5

Delta-Sigma

Modulator

(+)

VREF

VREF2

+

1.0

µF

4.7

µF

+

+

−

(−)

+

−

S0011-03

VREF1

4

4.7

µF

+

4.7

µF

+

PCM AUDIO INTERFACE

PCM3002

PCM3003

SBAS079A – OCTOBER 2000 – REVISED OCTOBER 2004

Figure 40. Analog Front-End (Single-Channel)

The four-wire digital audio interface for the PCM3002/3003 comprises LRCIN (pin 10), BCKIN (pin 11), DIN

(pin 15), and DOUT (pin 12). The PCM3002 can be used with any of the four input/output data formats (formats

0–3), while the PCM3003 can only be used with selected input/output formats (formats 0–1). For the PCM3002,

these formats are selected through program register 3 in the software mode. For the PCM3003, data formats are

selected by the 20BIT input (pin 16). Figure 41, Figure 42, and Figure 43 illustrate audio data input/output

formats and timing.

The PCM3002/3003 can accept 32, 48, or 64 bit clocks (BCKIN) in one clock of LRCIN. Only the 16-bit data

format can be selected when 32-bit clocks/LRCIN are applied.

19