Datasheet
MUX1[3:0] = 0000
RLD1P = 1
RLD1N = 1
MUX1[3:0] = 0010
MUX1[3:0] = 0010
PGA1
RLD2P = 0
RLD2N = 0
PGA2
RLD_AMP
RLDOUT RLDINVRLDIN/RLDREF
Filter or
Feedthrough
Device
IN1P
IN1N
EMI
Filter
MUX
EMI
Filter
IN2N
IN2P
RLDREF_INT = 1
2
(AVDD + AVSS)
RLDREF_INT = 0
1 M
(1)
1.5 nF
(1)
ADS1291
ADS1292
ADS1292R
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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.
(1) Typical values for example only.
Figure 48. RLDOUT Signal Configured to be Read Back by Channel 2
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