MAX11200 Datasheet, PDF (21/27 Pages) Maxim Integrated Products – 24-Bit, Single-Channel, Ultra-Low-Power, Delta-Sigma ADCs with GPIO

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 (VAINP - VAINN = 0V), the midscale value is 0x800000 (VAINP - VAINN = VREF/2), and the most positive value
is 0xFFFFFF (VAINP - VAINN = VREF).
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 (VAINP - VAINN = 0V), and the positive full scale is 0x7FFFFF (VAINP - VAINN = VREF). Any input
exceeding the available input range is limited to the minimum or maximum data value.
Table 15. DATA Register (Read Only)
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
Table 16a. Output Data Format for the Unipolar Input Range
INPUT VOLTAGE
VAINP - VAINN
≥ VREF
V_REF
×
_1−

1
2 ²⁴
−


1
DIGITAL OUTPUT CODE FOR UNIPOLAR RANGE
STRAIGHT BINARY FORMAT
0xFFFFFF
0xFFFFFE
V_REF
2²⁴ − 1
0
0x000001
0x000000
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