ADS1291
ADS1292
ADS1292R
SBAS502A –DECEMBER 2011–REVISED MARCH 2012
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INT_TEST
Device
MUX1[3:0] = 0101
MUX1[3:0] = 0100
MUX1[3:0] = 0011
TESTP
TEMPP
MVDDP
From LOFFP
MUX1[3:0] = 0000
IN2P
To PGA2_INP
MUX1[3:0] = 0110 or
MUX1[3:0] = 1000
MUX1[3:0] = 0001
MUX1[3:0] = 0001
MUX1[3:0] = 0010
VREFP + VREFN
2
EMI
Filter
MUX1[3:0] = 0111 or
MUX1[3:0] = 1000
MUX1[3:0] = 0000
IN2N
To PGA2_INN
From LOFFN
RLD_REF
MUX1[3:0] = 0010
MUX1[3:0] = 0011
MUX1[3:0] = 0100
MUX1[3:0] = 1001
MUX1[3:0] = 1001
MVDDN
TEMPN
INT_TEST
MUX1[3:0] = 0101
TESTM
TESTP
RLDIN/
RLDREF
INT_TEST
MUX1[3:0] = 0101
MUX1[3:0] = 0100
MUX1[3:0] = 0011
TEMPP
MVDDP
From LOFFP
MUX1[3:0] = 0000
IN1P
To PGA1_INP
MUX1[3:0] = 0111 or
MUX1[3:0] = 1000
MUX1[3:0] = 0001
MUX1[3:0] = 0010
VREFP + VREFN
2
EMI
Filter
MUX1[3:0] = 0110 or
MUX1[3:0] = 1000
MUX1[3:0] = 0001
MUX1[3:0] = 1001
MUX1[3:0] = 0000
IN1N
To PGA1_INN
From LOFFN
RLD_REF
MUX1[3:0] = 0010
MUX1[3:0] = 0011
MUX1[3:0] = 0100
MVDDN
MUX1[3:0] = 1001
TEMPN
RESP
MOD
INT_TEST
MUX1[3:0] = 0101
TESTM
RESP_MODP/IN3P
RESP_MODN/IN3N
NOTE: MVDD monitor voltage supply depends on channel number; see the Supply Measurements (MVDDP, MVDDN) section.
Figure 19. Input Multiplexer Block for Both Channels
18
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