Datasheet

MAX11203/MAX11213 16-Bit, Single-Channel, Ultra-Low-Power,
Delta- Sigma ADCs with Programmable Gain
and GPIO
www.maximintegrated.com
Maxim Integrated │ 20
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. D15 is the MSB, and D0
is the LSB. The result is stored in a format according to the FORMAT bit in the CTRL1 register.
The data format while in unipolar mode is always straight binary. In straight binary format, the most negative value is
0x0000 (V
AINP
- V
AINN
= 0V), the midscale value is 0x8000 (V
AINP
- V
AINN
= V
REF
/2), and the most positive value is
0xFFFF (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 format
is two’s complement. In two’s complement the negative full-scale value is 0x8000 (V
AINP
- V
AINN
= -V
REF
), the midscale
is 0x0000 (V
AINP
- V
AINN
= 0V), and the positive full scale is 0x7FFF (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 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
BIT
0 0 0 0 0 0 0 0
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
0xFFFF
0xFFFE
0x0001
0 0x0000
REF
24
1
V1
21

×−

−

REF
24
V
21
−