ADS1291
ADS1292
ADS1292R
SBAS502A –DECEMBER 2011–REVISED MARCH 2012
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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.
RLD1P = 1
IN1P
EMI
Filter
PGA1
PGA2
RLD1N = 1
MUX1[3:0] = 0000
IN1N
IN2P
RLD2P = 0
RLD2N = 0
EMI
Filter
MUX1[3:0] = 0010
IN2N
RLDREF_INT = 1
(AVDD + AVSS)
2
MUX
MUX1[3:0] = 0010
RLDREF_INT = 0
RLD_AMP
Device
RLDIN/RLDREF
RLDOUT
RLDINV
(1)
1 M
Filter or
Feedthrough
1.5 nF(1)
(1) Typical values for example only.
Figure 48. RLDOUT Signal Configured to be Read Back by Channel 2
50
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