SBAA493A June 2021 – April 2022 PCM3120-Q1 , PCM5120-Q1 , PCM6120-Q1 , TLV320ADC3120 , TLV320ADC5120 , TLV320ADC6120

4 Digital Microphone Power Consumption

Table 4-1 and Table 4-2 describes the typical current consumption of the TLV320ADCx120/PCMx120-Q1 when the digital microphone inputs are used with an external PDM modulator 4^th and 5^th order, respectively. The Digital Microphone is selected by:

Configuring the corresponding channel for digital microphone input in the CHx_INSRC register
Configuring the corresponding GPO1 or GPIO1 pin as PDMCLK output in the GPO_CFG0 or GPIO_CFG0 register, respectively.
Configuring the corresponding GPIx or GPIO1 pin as PDM input in the GPI_CFG0 or GPIO_CFG0 register, respectively

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	3.81	3.70	3.70	3.70
8	4	-	4.57	4.56	4.56
16	2	4.14	4.04	4.04	4.03
16	4	-	5.16	5.16	5.15
24	2	4.31	4.21	4.21	-
24	4	-	5.49	5.48	-
32	2	4.49	4.40	4.40	-
32	4	-	5.84	5.84	-
48	2	5.00	4.90	4.91	-
48	4	-	7.06	7.07	-
96	2	7.38	7.28	7.32	-
96	4	-	10.80	10.86	-
192	2	8.17	8.01	7.98	-
192	4	-	11.65	11.62	-

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	3.80	3.71	3.70	3.70
8	4	-	4.56	4.57	4.56
16	2	4.13	4.05	4.04	4.03
16	4	-	5.17	5.16	5.15
24	2	4.29	4.22	4.21	-
24	4	-	5.48	5.49	-
32	2	4.50	4.40	4.40	-
32	4	-	5.84	5.84	-
48	2	4.99	4.90	4.91	-
48	4	-	7.07	7.08	-
96	2	7.37	7.30	7.33	-
96	4	-	10.83	10.85	-
192	2	8.18	8.00	7.97	-
192	4	-	11.66	11.58	-