ADS8638_14 Datasheet, PDF (44/76 Pages) Texas Instruments – 12-Bit, 1MSPS, 4-/8-Channel, Bipolar-Input, SAR Analog-to-Digital Converter with Software-Selectable Ranges

ADS8634
ADS8638
SBAS541A – MAY 2011 – REVISED AUGUST 2011
Ch0-1 Range to Ch6-7 Range: Range Selection Registers for Channels 0 to 7
(Address = 10h to 13h; Page 0)
REGISTER
Ch0-1 Range
Ch2-3 Range
Ch4-5 Range
Ch6-7 Range
ADDRESS ON PAGE 0
10h
11h
12h
13h
Bit 7
0
0
0
0
Bit 6
Bit 5
Bit 4
Range Select Ch0[2:0]
Range Select Ch2[2:0]
Range Select Ch4[2:0]
Range Select Ch6[2:0]
Bit 3
0
0
0
0
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Bit 2
Bit 1
Bit 0
Range Select Ch1[2:0]
Range Select Ch3[2:0]
Range Select Ch5[2:0]
Range Select Ch7[2:0]
A selection of signal ranges are featured for each channel. The selected range is automatically assigned for a
channel during conversion, regardless of the channel scan mode (auto or manual). These registers (Ch0-1
Range to Ch6-7 Range) allow for range selection of all channels.
Bit 7
Bits[6:4]
Bit 3
Bits[2:0]
Must always be set to '0'
Range Select Chn[2:0]
These bits select the signal range for channel n, where n is 0, 2, 4, or 6, depending on the register address.
000 = Reserved; do not use this setting
001 = Range is set to ±10V
010 = Range is set to ±5V
011 = Range is set to ±2.5V
100 = Reserved; do not use this setting
101 = Range is set to 0V to 10V
110 = Range is set to 0V to 5V
111 = Reserved; do not use this setting
Must always be set to '0'
Range Select Chm[2:0]
These bits select the signal range for channel m, where m is 1, 3, 5, or 7, depending on the register address.
000 = Reserved; do not use this setting
001 = Range is set to ±10V
010 = Range is set to ±5V
011 = Range is set to ±2.5V
100 = Reserved; do not use this setting
101 = Range is set to 0V to 10V
110 = Range is set to 0V to 5V
111 = Reserved; do not use this setting
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