CS4349-CZZ 参数 Datasheet PDF下载

CS4349

4. APPLICATIONS

4.1

Sample Rate Range and Oversampling Mode Detect

The device operates in one of three oversampling modes based on the input sample rate. In Control Port

Mode, the allowed sample rate range in each mode will depend on how the FM[1:0] bits are configured. In

Stand-Alone Mode, the sample rate range will be according to

4.1.1

Sample Rate Auto-Detect

The Auto-Detect feature is enabled by default. In this state, the CS4349 will auto-detect the correct mode

when the input sample rate (Fs), defined by the LRCK frequency, falls within one of the ranges shown in

Sample rates outside the specified range for each mode are not supported when Auto-Detect is

enabled.

Input Sample Rate (Fs)

30 kHz - 54 kHz

60 kHz - 108 kHz

120 kHz - 216 kHz

Table 1. CS4349 Auto-Detect

Mode

Single-Speed Mode

Double-Speed Mode

Quad-Speed Mode

In Control Port Mode, the Auto-Detect feature can be disabled by the Functional Mode (FM[1:0]) bits in

the control port register 02h. In this state, the CS4349 will not auto-detect the correct mode based on the

input sample rate (Fs). The operational mode must then be set manually according to one of the ranges

referred to in

Sample rates outside the specified range for each mode are not supported.

In Stand-Alone Mode, it is not possible to disable auto-detect of sample rates.

4.2

System Clocking

The device requires external generation of the left/right (LRCK) and serial (SCLK) clocks. The left/right

clock, defined also as the input sample rate (F

s

).

Refer to

for the required SCLK-to-LRCK timing associated with the selected digital interface for-

mat, and

for the maximum allowed clock fre-

quencies.

18

DS782F1