Datasheet

ADS8528
ADS8548
ADS8568
SBAS543A –AUGUST 2011– REVISED OCTOBER 2011 www.ti.com
Bit 24 RANGE_A: Input voltage range selector for channel pair A
This bit is not active in hardware mode.
0 = Input voltage range: 4VREF (default)
1 = Input voltage range: 2VREF
Bit 23 RANGE_B: Input voltage range selector for channel pair B
This bit is not active in hardware mode.
0 = Input voltage range: 4VREF (default)
1 = Input voltage range: 2VREF
Bit 22 PD_B: Power-down enable for channel pair B
This bit is active in hardware mode.
0 = Normal operation (default)
1 = Channel pair B is powered down
Bit 21 RANGE_C: Input voltage range selector for channel pair C
This bit is not active in hardware mode.
0 = Input voltage range: 4VREF (default)
1 = Input voltage range: 2VREF
Bit 20 PD_C: Power-down enable for channel pair C
This bit is active in hardware mode.
0 = Normal operation (default)
1 = Channel pair C is powered down
Bit 19 RANGE_D: Input voltage range selector for channel pair D
This bit is not active in hardware mode.
0 = Input voltage range: 4VREF (default)
1 = Input voltage range: 2VREF
Bit 18 PD_D: Power-down enable for channel pair D
This bit is active in hardware mode.
0 = Normal operation (default)
1 = Channel pair D is powered down
Bits[17:16] Not used (default = 0)
Bit 15 REF_EN: Internal reference enable
This bit is not active in hardware mode.
0 = Internal reference source disabled (default)
1 = Internal reference source enabled
Bit 14 REFBUF: Internal reference buffers disable
This bit is active in hardware mode if the parallel interface is used.
0 = Internal reference buffers enabled (default)
1 = Internal reference buffers disabled
Bit 13 VREF: Internal reference voltage selector
This bit is active in hardware mode.
0 = Internal reference voltage set to 2.5V (default)
1 = Internal reference voltage set to 3.0V
Bits[12:10] Not used (default = 0)
Bits[9:0] D[9:0]: REFDAC setting bits
These bits are active in hardware mode.
These bits correspond to the settings of the internal reference DACs (compare to the
Reference section). Bit D9 is the MSB of the DAC. Default value is 3FFh (2.5V, nom).
32 Copyright © 2011, Texas Instruments Incorporated
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