Datasheet

ADS1146

ADS1147

ADS1148

SBAS453F –JULY 2009–REVISED APRIL 2012

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ADS1147 AND ADS1148 DETAILED REGISTER DEFINITIONS (continued)

IDAC1—IDAC Control Register 1

IDAC1 - ADDRESS 0Bh RESET VALUE = FFh

DEVICE BIT 7 BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 BIT 0

ADS1148 I1DIR3 I1DIR2 I1DIR1 I1DIR0 I2DIR3 I2DIR2 I2DIR1 I2DIR0

ADS1147 0 0 I1DIR1 I1DIR0 0 0 I2DIR1 I2DIR0

The two IDACs on the ADS1147 and ADS1148 can be routed to either the IEXC1 and IEXC2 output pins or

directly to the analog inputs.

Bits[7:4] I1DIR[3:0]

These bits select the output pin for the first current source DAC.

0000 = AIN0

0001 = AIN1

0010 = AIN2

0011 = AIN3

0100 = AIN4 (ADS1148 only)

0101 = AIN5 (ADS1148 only)

0110 = AIN6 (ADS1148 only)

0111 = AIN7 (ADS1148 only)

10x0 = IEXT1 (ADS1148 only)

10x1 = IEXT2 (ADS1148 only)

11xx = Disconnected (default)

Bits[3:0] I2DIR[3:0]

These bits select the output pin for the second current source DAC.