ADS1292 datasheet(49/69 Pages) TI

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MUX1[3:0] = 0000

RLD1P = 1

RLD1N = 1

MUX1[3:0] = 0111

PGA1

RLD2P = 0

RLD2N = 0

PGA2

RLD_AMP

RLDOUT

RLDINV

RLDIN/RLDREF

Filter or

Feedthrough

ADS1292R

EMI

Filter

EMI

Filter

IN1P

IN1N

IN2P

IN2N

MUX

1 M

(1)

1.5 nF

(1)

(AVDD + AVSS)

RLDREF_INT = 1

RLDREF_INT = 0

ADS1291

ADS1292

ADS1292R

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SBAS502A – DECEMBER 2011 – REVISED MARCH 2012

ECG-SPECIFIC FUNCTIONS

INPUT MULTIPLEXER (REROUTING THE RIGHT LEG DRIVE SIGNAL)

The input multiplexer has ECG-specific functions for the right leg drive signal. The RLD signal is available at the

RLDOUT pin once the appropriate channels are selected for RLD derivation, feedback elements are installed

external to the chip, and the loop is closed. This signal can be fed after filtering or fed directly into the RLDIN pin,

as shown in Figure 47. This RLDIN signal can be multiplexed into any one of the input electrodes by setting the

MUX bits of the appropriate channel set registers to '0110' for P-side or '0111' for N-side. Figure 47 shows the

RLD signal generated from channel 1 and routed to the N-side of channel 2. This feature can be used to

dynamically change the electrode that is used as the reference signal to drive the patient body. Note that the

corresponding channel cannot be used and can be powered down.

(1) Typical values for example only.

Figure 47. Example RLDOUT Signal Configured to be Routed to IN2N

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ADS1292 Datasheet(PDF) 49 Page - Texas Instruments

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