Datasheet

MUX[2:0]=101
TempP
MUX[2:0]= 100
MvddP
(1)
MUX[2:0]= 011
FromLoffP
MUX[2:0]= 000
MUX[2:0]= 110
MUX[2:0]= 001
ToPgaP
ToPgaN
MUX[2:0]= 001
RLDIN
MUX[2:0]= 010
RLD_MEAS
AND
MUX[2:0]= 111
VINP
VINN
MUX[2:0]= 000
FromLoffN
RLD_REF
MUX[2:0]= 010
RLD_MEAS
AND
MvddN
(1)
TempN
MUX[2:0]= 100
MUX[2:0]= 101
ADS119x
MUX
TestP
TestN
TESTP_PACE_OUT1
INT_TEST
INT_TEST
TESTN_PACE_OUT2
INT_TEST
INT_TEST
MUX[2:0]= 011
EMI
Filter
(AVDD+AVSS)
2
ADS1194, ADS1196
ADS1198
www.ti.com SBAS471C –APRIL 2010– REVISED NOVEMBER 2011
EMI FILTER
An RC filter at the input acts as an electromagnetic interference (EMI) filter on all of the channels. The –3dB filter
bandwidth is approximately 3MHz.
INPUT MULTIPLEXER
The ADS1194/6/8 input multiplexers are very flexible and provide many configurable signal switching options.
Figure 15 shows the multiplexer on a single channel of the device. Note that the device has eight such blocks,
one for each channel. TEST_PACE_OUT1, TEST_PACE_OUT2, and RLD_IN are common to all eight blocks.
VINP and VINN are separate for each of the eight blocks. This flexibility allows for significant device and
sub-system diagnostics, calibration and configuration. Selection of switch settings for each channel is made by
writing the appropriate values to the CHnSET[2:0] register (see the CHnSET: Individual Channel Settings section
for details) and by writing the RLD_MEAS bit in the CONFIG3 register (see the CONFIG3: Configuration Register
3 subsection of the Register Map section for details). More details of the ECG-specific features of the multiplexer
are discussed in the Input Multiplexer subsection of the ECG-Specifc Functions section.
(1) MVDD monitor voltage supply depends on channel number; see the Supply Measurements (MVDDP, MVDDN)
section.
Figure 15. Input Multiplexer Block for One Channel
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Product Folder Link(s): ADS1194 ADS1196 ADS1198