SBAA500A May 2021 – September 2021 PCM6020-Q1 , PCM6240-Q1 , PCM6260-Q1 , PCM6340-Q1

4 Digital Microphone Power Consumption

Table 4-1 and Table 4-2 describes the typical current consumption of the PCM6480 when the digital microphone inputs are used with an external PDM modulator 4^th and 5^th order, respectively. PCM6480 supports up to 4 PDM channels. The Digital Microphone is selected by:

Configuring the corresponding channel for digital microphone input in the CHx_INSRC field in the CHx_CFG0 register.
Configuring the corresponding GPIOx pin as PDMCLK output in the appropriate GPIO_CFGx register.
Configuring the corresponding GPIx pin as PDM input in the appropriate GPI_CFGx register.

Table 4-1 PDM Typical Current Consumption With an External PDM 4^th Order Modulator

PDM CLOCK		6.144 MHz	3.072 MHz	1.536 MHz	0.768 MHz
SAMPLING RATE (kHz)	DIGITAL MICROPHONE CHANNELS	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)
8	2	6.36	6.31	6.28	6.26
8	4	7.74	7.68	7.65	7.62
16	2	6.69	6.65	6.62	6.60
16	4	8.36	8.30	8.29	8.23
24	2	6.66	6.60	6.58	-
24	4	8.27	8.22	8.18	-
32	2	6.91	6.88	6.84	-
32	4	8.72	8.69	8.63	-
48	2	7.46	7.42	7.37	-
48	4	9.94	9.90	9.84	-
96	2	10.10	10.02	9.96	-
96	4	13.99	13.88	13.79	-
192	2	10.10	10.01	9.93	-
192	4	14.08	13.96	13.83	-

Table 4-2 PDM Typical Current Consumption With an External PDM 5^th Order Modulator

PDM CLOCK		6.144 MHz	3.072 MHz	1.536 MHz	0.768 MHz
SAMPLING RATE (kHz)	DIGITAL MICROPHONE CHANNELS	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)	AVDD CURRENT AT 3.3 V (mA)
8	2	6.36	6.31	6.28	6.27
8	4	7.73	7.68	7.65	7.64
16	2	6.69	6.65	6.63	6.61
16	4	8.36	8.33	8.30	8.27
24	2	6.66	6.62	6.59	-
24	4	8.25	8.23	8.18	-
32	2	6.91	6.89	6.84	-
32	4	8.71	8.70	8.64	-
48	2	7.47	7.42	7.38	-
48	4	9.97	9.91	9.85	-
96	2	10.11	10.03	9.97	-
96	4	14.01	13.89	13.79	-
192	2	10.12	10.02	9.93	-
192	4	14.12	13.97	13.82	-