ADS1291_14 Datasheet, PDF (43/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

www.ti.com
CH1SET: Channel 1 Settings
Address = 04h
BIT 7
PD1
BIT 6
GAIN1_2
BIT 5
GAIN1_1
BIT 4
GAIN1_0
ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
BIT 3
MUX1_3
BIT 2
MUX1_2
BIT 1
MUX1_1
BIT 0
MUX1_0
This register configures the power mode, PGA gain, and multiplexer settings channels. See the Input Multiplexer
section for details.
Bit 7
Bits[6:4]
Bits[3:0]
PD1: Channel 1 power-down
0 = Normal operation (default)
1 = Channel 1 power-down⁽¹⁾
GAIN1[2:0]: Channel 1 PGA gain setting
These bits determine the PGA gain setting for channel 1.
000 = 6 (default)
001 = 1
010 = 2
011 = 3
100 = 4
101 = 8
110 = 12
MUX1[3:0]: Channel 1 input selection
These bits determine the channel 1 input selection.
0000 = Normal electrode input (default)
0001 = Input shorted (for offset measurements)
0010 = RLD_MEASURE
0011 = MVDD⁽²⁾ for supply measurement
0100 = Temperature sensor
0101 = Test signal
0110 = RLD_DRP (positive input is connected to RLDIN)
0111 = RLD_DRM (negative input is connected to RLDIN)
1000 = RLD_DRPM (both positive and negative inputs are connected to RLDIN)
1001 = Route IN3P and IN3N to channel 1 inputs
1010 = Reserved
(1) When powering down channel 1, make sure the input multiplexer is set to input short configuration. Bits[3:0] = 001.
(2) For channel 1, (MVDDP – MVDDN) is [0.5(AVDD + AVSS)]; for channel 2, (MVDDP – MVDDN) is DVDD / 4. Note that to avoid
saturating the PGA while measuring power supplies, the gain must be set to '1'.
Copyright © 2011–2012, Texas Instruments Incorporated
Submit Documentation Feedback
43
Product Folder Links: ADS1291 ADS1292 ADS1292R