ADS1291_14 Datasheet, PDF (51/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

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ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
Input Multiplexer (Measuring the Right Leg Drive Signal)
The RLDOUT signal can also be routed to a channel (that is not used for the calculation of RLD) for
measurement. Figure 48 shows the register settings to route the RLDIN signal to channel 2. The measurement is
done with respect to the voltage (AVDD + AVSS) / 2. This feature is useful for debugging purposes during
product development.
IN1P
IN1N
EMI
Filter _{MUX1[3:0] = 0000}
PGA1
RLD1P = 1
RLD1N = 1
IN2P
IN2N
EMI
Filter MUX1[3:0] = 0010
MUX
Device
RLD2P = 0
PGA2
RLD2N = 0
RLDREF_INT = 1
(AVDD + AVSS)
2
MUX1[3:0] = 0010
RLDREF_INT = 0
RLD_AMP
RLDIN/RLDREF
Filter or
Feedthrough
RLDOUT
1 M ⁽¹⁾
RLDINV
1.5 nF⁽¹⁾
(1) Typical values for example only.
Figure 48. RLDOUT Signal Configured to be Read Back by Channel 2
Copyright © 2011–2012, Texas Instruments Incorporated
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