SBAS492 – JULY 2015
8.5.2.3.3
Range Select Registers (addresses 05h-0Ch)
Address 05h corresponds to channel 0, address 06h corresponds to channel 1, address 07h corresponds to
channel 2, address 08h corresponds to channel 3, address 09h corresponds to channel 4, address 0Ah
corresponds to channel 5, address 0Bh corresponds to channel 6, and address 0Ch corresponds to channel 7.
These registers allow the selection of input ranges for all individual channels (n = 0 to 3 for the ADS8664 and n =
0 to 7 for the ADS8668). The default value for these registers is 00h.
Figure 112. Channel n Input Range Registers
7
6
5
4
3
2
1
0
0
0
0
0
Range_CH
n
[3:0]
R-0h
R-0h
R-0h
R-0h
R/W-0h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 15. Channel n Input Range Registers Field Descriptions
Bit
Field
Type
Reset
Description
7-4
0
R
0h
Must always be set to 0
3-0
Range_CH
n
[3:0]
R/W
0h
Input range selection bits for channel n (n = 0 to 3 for the ADS8664 and
n = 0 to 7 for the ADS8668).
0000 = Input range is set to ±2.5 x V
REF
0001 = Input range is set to ±1.25 x V
REF
0010 = Input range is set to ±0.625 x V
REF
0011 = Input range is set to ±0.3125 x V
REF
1011 = Input range is set to ±0.15625 x V
REF
0101 = Input range is set to 0 to 2.5 x V
REF
0110 = Input range is set to 0 to 1.25 x V
REF
0111 = Input range is set to 0 to 0.625 x V
REF
1111 = Input range is set to 0 to 0.3125 x V
REF
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