AN-877 Application Note
Rev. B | Page 16 of 20
High-Pass (0x02B)
Register 0x02B configures the high-pass filter.
Bit 7, Bit 5 to Bit 3—Reserved
Bit 6—Tune
Bit 6 is used to calibrate either the high-pass or the low-pass on-
chip filters. Setting this bit initiates the bandwidth calibration
process. Consult the device data sheet to determine which
filters are calibrated and additional details.
Bit 2 to Bit 0—Bandwidth (High-Pass)
Bit 2 to Bit 0 determine the corner frequency or the on-chip
high-pass filter. Note that 000 is the default bandwidth and
corresponds to dc coupling. Alternate bandwidths are defined
with values 001 through 111. Not all options may be available
(see the device datasheet for options available).
Table 13. High-Pass Filter Select, Register 0x02B, Bits[2:0]
Bit 2 to Bit 0 Bandwidth Mode
000 Default bandwidth (dc)
001 through 111 Alternate high-pass choices
Analog In (0x02C)
Bit 7 to Bit 1—Reserved
Bit 0—Input Impedance
Bit 0 allows one of two input impedances to be selected (see the
device data sheet for details).
Cross Point Switch (0x02D)
This function provides an analog cross point switch that may be
used for connecting the analog input to the core ADC or to route
various analog inputs to various auxiliary analog outputs as
defined in the device data sheet.
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