JAJSF44D March 2014 – March 2018 PCM1860 , PCM1861 , PCM1862 , PCM1863 , PCM1864 , PCM1865
PRODUCTION DATA.
The PCM186x software-controlled devices offer a mix and multiplex level of functionality on the front end, as shown in Figure 27. The switches integrated into the multiplexer can also be switched on in parallel, offering a direct mix of inputs. This function can be selected by register for each ADC input selection, ADCX1_INPUT_SEL_X (Page.0, 0x06 → 0x09). In single ended mode, each Audio ADC is tightly coupled to a dedicated PGA and MUX. ADC1L (and ADC2L on the PCM1864 and PCM1865) is connected a mux that has input pins VINLx, (x = 1 to 4). ADC1R (and ADC2R on the PCM1864 and PCM1865) is connected to a mux that has input pins VINRx (x = 1 to 4).
Mixing between the left channels of stereo pairs is possible in the mux dedicated to ADC1L and right channels of stereo pairs in the mux dedicated to ADC1R. In addition, polarity of the inputs can be inverted using the MSB of the select register. Mixing left and right sources to create mono mixes can only be done in the digital mixer, post ADC conversion, or alternatively, other analog inputs can be connected for mixing.
The examples available are shown in Table 2, where [SE] is single-ended, and [DIFF] is a differential input.
REGISTER CODE | ADC1L AND ADC2L | ADC1R AND ADC2R |
---|---|---|
0x00 | No Selection (Mute) | No Selection (Mute) |
0x01 | VINL1[SE] (Default) | VINR1[SE] (Default) |
0x02 | VINL2[SE] | VINR2[SE] |
0x03 | VINL2[SE] + VINL1[SE] | VINR2[SE] + VINR1[SE] |
0x04 | VINL3[SE] | VINR3[SE] |
0x05 | VINL3[SE] + VINL1[SE] | VINR3[SE] + VINR1[SE] |
0x06 | VINL3[SE] + VINL2[SE] | VINR3[SE] + VINR2[SE] |
0x07 | VINL3[SE] + VINL2[SE] + VINL1[SE] | VINR3[SE] + VINR2[SE] + VINR1[SE] |
0x08 | VINL4[SE] | VINR4[SE] |
0x09 | VINL4[SE] + VINL1[SE] | VINR4[SE] + VINR1[SE] |
0x0A | VINL4[SE] + VINL2[SE] | VINR4[SE] + VINR2[SE] |
0x0B | VINL4[SE] + VINL2[SE] + VINL1[SE] | VINR4[SE] + VINR2[SE] + VINR1[SE] |
0x0C | VINL4[SE] + VINL3[SE] | VINR4[SE] + VINR3[SE] |
0x0D | VINL4[SE] + VINL3[SE] + VINL1[SE] | VINR4[SE] + VINR3[SE] + VINR1[SE] |
0x0E | VINL4[SE] + VINL3[SE] + VINL2[SE] | VINR4[SE] + VINR3[SE] + VINR2[SE] |
0x0F | VINL4[SE] + VINL3[SE] + VINL2[SE] + VINL1[SE] | VINR4[SE] + VINR3[SE] + VINR2[SE] + VINR1[SE] |
0x10 | {VIN1P, VIN1M}[DIFF] | {VIN2P, VIN2M}[DIFF] |
0x20 | {VIN4P, VIN4M}[DIFF] | {VIN3P, VIN3M}[DIFF] |
0x30 | {VIN1P, VIN1M}[DIFF] + {VIN4P, VIN4M}[DIFF] | {VIN2P, VIN2M}[DIFF] + {VIN3P, VIN3M}[DIFF] |