Datasheet

ADS1246
ADS1247
ADS1248
www.ti.com SBAS426G –AUGUST 2008–REVISED OCTOBER 2011
ADS1247 and ADS1248 DETAILED REGISTER DEFINITIONS
MUX0—Multiplexer Control Register 0. This register allows any combination of differential inputs to be selected
on any of the input channels. Note that this setting can be superceded by the MUXCAL and VBIAS bits.
MUX0 - ADDRESS 00h RESET VALUE = 01h
BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
BCS1 BCS0 MUX_SP2 MUX_SP1 MUX_SP0 MUX_SN2 MUX_SN1 MUX_SN0
Bits 7:6 BCS1:0
These bits select the magnitude of the sensor detect current source.
00 = Burnout current source off (default)
01 = Burnout current source on, 0.5μA
10 = Burnout current source on, 2μA
11 = Burnout current source on, 10μA
Bits 5:3 MUX_SP2:0
Positive input channel selection bits.
000 = AIN0 (default)
001 = AIN1
010 = AIN2
011 = AIN3
100 = AIN4 (ADS1248 only)
101 = AIN5 (ADS1248 only)
110 = AIN6 (ADS1248 only)
111 = AIN7 (ADS1248 only)
Bits 2:0 MUX_SN2:0
Negative input channel selection bits.
000 = AIN0
001 = AIN1 (default)
010 = AIN2
011 = AIN3
100 = AIN4 (ADS1248 only)
101 = AIN5 (ADS1248 only)
110 = AIN6 (ADS1248 only)
111 = AIN7 (ADS1248 only)
VBIAS—Bias Voltage Register
VBIAS - ADDRESS 01h RESET VALUE = 00h
DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0
ADS1248 VBIAS7 VBIAS6 VBIAS5 VBIAS4 VBIAS3 VBIAS2 VBIAS1 VBIAS0
ADS1247 0 0 0 0 VBIAS3 VBIAS2 VBIAS1 VBIAS0
Bits 7:0 VBIAS7:0
These bits apply a bias voltage of midsupply (AVDD + AVSS)/2 to the selected analog input.
0 = Bias voltage not enabled (default)
1 = Bias voltage is applied on the corresponding analog input (bit 0 corresponds to AIN0, etc.).
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