CS42436-DMZ datasheet(30/66 Pages) CIRRUS

30 / 66 page

DS647PP2

Software Mode

Single-Ended mode is selected using the ADC3_SINGLE bit. Analog input selection is then

made via the AINx_MUX bits. See register “ADC Control & DAC De-emphasis (address 05h)”

on page 46 for all bit selections. Refer to Figure 10 on page 29 for the internal ADC3 analog input

topology.

5.2.3 High Pass Filter and DC Offset Calibration

The high pass filter continuously subtracts a measure of the DC offset from the output of the dec-

imation filter. If the high pass filter is disabled during normal operation, the current value of the

DC offset for the corresponding channel is frozen and this DC offset will continue to be subtract-

ed from the conversion result. This feature makes it possible to perform a system DC offset cal-

ibration by:

1) Running the CS42436 with the high pass filter enabled until the filter settles. See the Digital

Filter Characteristics for filter settling time.

2) Disabling the high pass filter and freezing the stored DC offset.

Hardware Mode

The high pass filters for ADC1 and ADC2 are permanently enabled in Hardware Mode. The high

pass filter for ADC3 is enabled by driving the ADC3_HPF (pin 4) high.

Software Mode

The high pass filter for ADC1/ADC2 can be enabled and disabled. The high pass filter for ADC3

can be independently enabled and disabled. The high pass filters are controlled using the

HPF_FREEZE bit in the register “ADC Control & DAC De-emphasis (address 05h)” on page 46.

Configuration Setting

AIN5 Input Selection

ADC_SDOUT

(pin 13)

AIN5_MUX

(pin 1)

47 k

Ω Pull-down

Differential Input (pins 50 & 49)

47 k

Ω Pull-up

Low

AIN5A Input (pin 50)

47 k

Ω Pull-up

High

AIN5B Input (pin 49)

Table 3. AIN5 Analog Input Selection

Configuration Setting

AIN6 Input Selection

ADC_SDOUT

(pin 13)

AIN6_MUX

(pin 2)

47 k

Ω Pull-down

Differential Input (pins 52 & 51)

47 k

Ω Pull-up

Low

AIN5A Input (pin 52)

47 k

Ω Pull-up

High

AIN5B Input (pin 51)

Table 4. AIN6 Analog Input Selection

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