ANALOG PRODUCTS DIVISION

561 E. Elliot Road #175 Chandler, AZ 85225 Tel: (480) 539-2900. Fax: (480) 747-1715

www.protekanalog.com

PA5144

24-Bit, 192 kHz Stereo D/A Converter

for PCM Audio

95240 Rev.0. 01/10

NOT FOR USE IN LIFE SUPPORT SYSTEMS

Figure 1 Recommended Application Circuit.

APPLICATION DESCRIPTIONS

Sampling Rate and Input Clocks

The serial audio input data is transmitted to the device at SDATA pin.

According to the sampling rate, the device can work in three speed modes, single speed, double speed and quad speed.

The device can detect the speed mode of the input data stream automatically when the sampling rate falls into the auto detection

ranges listed in Table1.

If the sampling rate is outside the auto detection ranges, the device will not work properly.

The device works with the input system clock CLKIN, sample data clock LRCK and bit clock SCLK.

The data clock and bit clock must be synchronously derived from the system clock with some specific rates.

The device only supports the CLKIN/LRCK ratios listed in Table1. The LRCK/SCLK ratio is normally 64.

The device detects clock ratios automatically, and it will not work properly if any ratio is incorrect.

Audio Data Input

The PA5144LV can accept I²S serial audio input data from 16-bit to 24-bit. The device can detect the data word length automatically.

The relationship of SDATA, SCLK and LRCK for the format is illustrated through Figures 2.

n- 2 n- 1 n

3

2

1

1 SCLK

MSB

LSB

LEFT CHANNEL

n- 2 n- 1 n

3

2

1

1 SCLK

MSB

LSB

RIGHT CHANNEL

SDATA

SCLK

LRCK

Figure 2. I

Table 1 Auto Detection Ranges and CLKIN/LRCK Ratio.

MODE

Fs Auto Detection Range

CLKIN/LRCK Ratio

Single Speed

8kHz – 50kHz

256, 384, 512, 768, 1024

Double Speed

84kHz – 100kHz

128, 192, 256, 384, 512

Quad Speed

167kHz – 200kHz

128, 192, 256

Serial

Audio

DATA

PA5144

SDATA

SCLK

LRCK

CLKIN

GND

1

2

3

4

6

7

8

10

0.1µF

1µF

16V

3.3µF

16V

3.3µF

16V

3000pF

3000pF

560Ω

560Ω

10KΩ

10KΩ

5.0V

Left and Right

Channel output

33pF

12Ω

10µF

16V

CAP1

CAP2

5

9