Datasheet

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Maxim Integrated │ 20
MAX11200/MAX11210 24-Bit, Single-Channel, Ultra-Low-Power,
Delta-Sigma ADCs with GPIO
DATA: Data Register
The data register is a 24-bit read-only register. Any attempt to write data to the data register has no effect. The data
read from this register is clocked out MSB first. The data register holds the conversion result. D23 is the MSB, and D0
is the LSB. The result is stored in a format according to the FORMAT bit in CTRL1 register.
The data format while in unipolar mode is always straight binary. In straight binary format, the most negative value is
0x000000 (V
AINP
- V
AINN
= 0V), the midscale value is 0x800000 (V
AINP
- V
AINN
= V
REF
/2), and the most positive value
is 0xFFFFFF (V
AINP
- V
AINN
= V
REF
).
In bipolar mode, if the FORMAT bit = 1, then the data format is offset binary. If the FORMAT bit = 0, then the data for-
mat is two’s complement. In two’s complement, the negative full-scale value is 0x800000 (V
AINP
- V
AINN
= -V
REF
), the
midscale is 0x000000 (V
AINP
- V
AINN
= 0V), and the positive full scale is 0x7FFFFF (V
AINP
- V
AINN
= V
REF
). Any input
exceeding the available input range is limited to the minimum or maximum data value.
Table 15. DATA Register (Read Only)
Table 16a. Output Data Format for the Unipolar Input Range
BIT D23 D22 D21 D20 D19 D18 D17 D16
DEFAULT
0 0 0 0 0 0 0 0
BIT D15 D14 D13 D12 D11 D10 D9 D8
DEFAULT
0 0 0 0 0 0 0 0
BIT D7 D6 D5 D4 D3 D2 D1 D0
DEFAULT
0 0 0 0 0 0 0 0
INPUT VOLTAGE
V
AINP
- V
AINN
DIGITAL OUTPUT CODE FOR UNIPOLAR RANGE
STRAIGHT BINARY FORMAT
≥ V
REF
0xFFFFFF
0xFFFFFE
0x000001
0 0x000000
REF
24
1
V1
21

×−

−

REF
24
V
21−