CS5345_07 datasheet(23/41 Pages) CIRRUS

23 / 41 page

DS658F2

CS5345

4. APPLICATIONS

4.1

Recommended Power-Up Sequence

1. Hold RESET low until the power supply,MCLK, and LRCK are stable. In this state, the Control Port is

reset to its default settings.

2. Bring RESET high. The device will remain in a low power state with the PDN bit set by default. The con-

trol port will be accessible.

3. The desired register settings can be loaded while the PDN bit remains set.

4. Clear the PDN bit to initiate the power-up sequence.

4.2

System Clocking

The CS5345 will operate at sampling frequencies from 4 kHz to 200 kHz. This range is divided into three

speed modes as shown in Table 1.

4.2.1

Master Clock

MCLK/LRCK must maintain an integer ratio as shown in Table 2. The LRCK frequency is equal to Fs, the

frequency at which audio samples for each channel are clocked out of the device. The FM bits (See “Func-

tional Mode (Bits 7:6)” on page 32.) and the MCLK Freq bits (See “MCLK Frequency - Address 05h” on

page 33.) configure the device to generate the proper clocks in Master Mode and receive the proper

clocks in Slave Mode. Table 2 illustrates several standard audio sample rates and the required MCLK and

LRCK frequencies.

Mode

Sampling Frequency

Single-Speed

4-50 kHz

Double-Speed

50-100 kHz

Quad-Speed

100-200 kHz

Table 1. Speed Modes

LRCK

(kHz)

MCLK (MHz)

64x

96x

128x

192x

256x

384x

512x

768x

1024x

---

8.1920

12.2880

16.3840

24.5760

32.7680

44.1

---

11.2896

16.9344

22.5792

33.8680

45.1584

---

12.2880

18.4320

24.5760

36.8640

49.1520

8.1920

12.2880

16.3840

24.5760

32.7680

88.2

11.2896

16.9344

22.5792

33.8680

45.1584

12.2880

18.4320

24.5760

36.8640

49.1520

128

8.1920

12.2880

16.3840

24.5760

32.7680

176.4

11.2896

16.9344

22.5792

33.8680

45.1584

192

12.2880

18.4320

24.5760

36.8640

49.1520

Mode

QSM

DSM

SSM

Table 2. Common Clock Frequencies

CS5345 Datasheet(PDF) 23 Page - Cirrus Logic

CS5345 Datasheet(HTML) 23 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

Datasheet Download

Link URL