PCM1789 datasheet(16/39 Pages) TI

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AUDIO SERIAL PORT OPERATION

AUDIO DATA INTERFACE FORMATS AND TIMING

LRCK

LeftChannel

MSB

LSB

RightChannel

BCK

DIN

LRCK

N M

LSB

MSB

LSB

MSB

RightChannel

LeftChannel

BCK

DIN

PCM1789

SBAS451 – OCTOBER 2008.............................................................................................................................................................................................. www.ti.com

The PCM1789 audio serial port consists of three signals: BCK, LRCK, and DIN. BCK is a bit clock input. LRCK is

a left/right word clock or frame synchronization clock input. DIN is the audio data input for VOUTL/R.

The PCM1789 supports six audio data interface formats: 16-/20-/24-/32-bit I2S, 16-/20-/24-/32-bit left-justified,

24-bit right-justified, 16-bit right-justified, 24-bit left-justified mode DSP, and 24-bit I2S mode DSP. In the case of

I2S, left-justified, and right-justified data formats, 64 BCKs, 48 BCKs, and 32 BCKs per LRCK period are

supported; however, 48 BCKs are limited to 192/384/768 fS SCKI, and 32 BCKs are limited to 16-bit right-justified

only. The audio data formats are selected by MC/SCL/FMT in hardware control mode and by the FMTDA[2:0]

bits in control register 17 (11h) in software control mode. All data must be in binary twos complement and MSB

first.

Table 4 summarizes the applicable formats and describes the relationships among them and the respective

restrictions with mode control. Figure 22 through Figure 26 show six audio interface data formats.

Table 4. Audio Data Interface Formats and Sampling Rate, Bit Clock, and System Clock Restrictions

MAX LRCK FREQUENCY

CONTROL MODE

FORMAT

DATA BITS

(fS)

SCKI RATE (xfS)

BCK RATE (xfS)

16/20/24/32(1)

192 kHz

128 to 1152(2)

64, 48

I2S/Left-Justified

Software control

Right-Justified

24, 16

192 kHz

128 to 1152(2)

64, 48, 32 (16 bit)(3)

192 kHz

128 to 768

I2S/Left-Justified DSP

Hardware control

16/20/24/32(1)

192 kHz

128 to 1152(2)

64, 48

I2S/Left-Justified

(1)

32-bit data length is acceptable only for BCK = 64 fS and when using I

2S or Left-Justified format.

(2)

1152 fS is acceptable only for fS = 32 kHz, BCK = 64 fS, and when using I

2S, Left-Justified, or 24-bit Right-Justified format.

(3)

BCK = 32 fS is supported only for 16-bit data length.

Figure 22. Audio Data Format: 16-/20-/24-/32-Bit I2S

(N = 15/19/23/31, M = 14/18/22/30, and L = 13/17/21/29)

Figure 23. Audio Data Format: 16-/20-/24-/32-Bit Left-Justified

(N = 15/19/23/31, M = 14/18/22/30, and L = 13/17/21/29)

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