Owner's manual

MAXQ7665/MAXQ7666 User’s Guide
3-22
3.3.5 Transfer Function
The MAXQ7665/MAXQ7666 ADC output is straight binary in unipolar mode. Figure 3-5 shows the MAXQ7665/MAXQ7666 ADC unipo-
lar transfer function for PGA gain of 1. Table 3-4 shows the unipolar relationship between the differential analog input voltage and the
digital output code for PGA gain of 1.
Table 3-4. Unipolar Code Table (PGA Gain = 1)
Figure 3-5. Unipolar Transfer Function (PGA Gain = 1)
000
001
002
003
004
FFC
FFB
FFD
FFE
FFF
01
2
3
4
FS
FS - 1.5 LSB
FULL-SCALE
TRANSITION
FS = REFADC
ZS = 0
1 LSB = REFADC / 4096
OUTPUT CODE (hex)
DIFFERENTIAL INPUT VOLTAGE (LSB)
BINARY DIGITAL OUTPUT CODE
ADCD11:ADCD0
HEXADECIMAL EQUIVALENT OF
ADCD11:ADCD0
DECIMAL EQUIVALENT OF
ADCD11:ADCD0 (CODE
12
)
IDEAL DIFFERENTIAL INPUT
VOLTAGE (V)
(REFADC = 5.0V)
1111 1111 1111 0xFFF 4095 +4.99878 ± 0.5 LSB
1111 1111 1110 0xFFE 4094 +4.99756 ± 0.5 LSB
1000 0000 0001 0x801 2049 +2.50122 ± 0.5 LSB
1000 0000 0000 0x800 2048 +2.5 ± 0.5 LSB
0111 1111 1111 0x7FF 2047 +2.49878 ± 0.5 LSB
0000 0000 0001 0x001 1 +0.00122 ± 0.5 LSB
0000 0000 0000 0x000 0 +0.000 + 0.5 LSB
Maxim Integrated