ZHCSMU9A 数据表 | 德州仪器 TI.com.cn

8.4.9 Clocks and PLL

The device clocking is derived from the SBCLK input clock. The tables below show the valid SBCLK clock frequencies for each sample rate and SBCLK to FSYNC ratio (for 44.1 kHz and 48 kHz family frequencies).

If the sample rate is properly configured via the SAMP_RATE[2:0] register bits, no additional configuration is required as long as the SBCLK to FSYNC ratio is valid. The device will detect improper SBCLK frequencies and SBCLK to FSYNC ratios and volume ramp down the playback path to minimize audible artifacts. After the clock error is detected, the device will enter a low power halt mode after a time set by CLK_HALT_TIMER[2:0] register bits if CLK_HALT_EN bit is high. Additionally, the device can automatically power up and down on valid clock signals if CLK_ERR_PWR_EN register bit is set to high. The device sampling rate should not be changed while this feature is enabled. In this mode the CLK_HALT_EN bit register should be set high in order for this feature to work properly.

Table 8-3 Supported SBCLK Frequencies (48 kHz based sample rates)

Sample Rate (kHz)	SBCLK to FSYNC Ratio
Sample Rate (kHz)	16	24	32	48	64	96	125
48 kHz	768 kHz	1.152 MHz	1.536 MHz	2.304 MHz	3.072 MHz	4.608 MHz	6 MHz
96 kHz	1.536 MHz	2.304 MHz	3.072 MHz	4.608 MHz	6.144 MHz	9.216 MHz	12 MHz
Sample Rate (kHz)	SBCLK to FSYNC Ratio
Sample Rate (kHz)	128	192	250	256	384	500	512
48 kHz	6.144 MHz	9.216 MHz	12 MHz	12.288 MHz	18.432 MHz	24 MHz	24.576 MHz
96 kHz	12.288 MHz	18.432 MHz	24 MHz	24.576 MHz	-	-	-

Table 8-4 Supported SBCLK Frequencies (44.1 kHz based sample rates)

Sample Rate (kHz)	SBCLK to FSYNC Ratio
Sample Rate (kHz)	16	24	32	48	64	96	125
44.1 kHz	705.6 kHz	1.0584 MHz	1.4112 MHz	2.1168 MHz	2.8224 MHz	4.2336 MHz	5.5125 MHz
88.2 kHz	1.4112 MHz	2.1168 MHz	2.8224 MHz	4.2336 MHz	5.6448 MHz	8.4672 MHz	11.025 MHz
Sample Rate (kHz)	SBCLK to FSYNC Ratio
Sample Rate (kHz)	128	192	250	256	384	500	512
44.1 kHz	5.6448 MHz	8.4672 MHz	11.025 MHz	11.2896 MHz	16.9344 MHz	22.05 MHz	22.5792 MHz
88.2 kHz	11.2896 MHz	16.9344 MHz	22.05 MHz	22.5792 MHz	-	-	-

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8.4.9 Clocks and PLL