Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 245)

14-13 _________________________________________________________________________________________________________

MAXQ7667 User’s Guide

The MAXQ7667 ADC output is two’s complement in bipolar mode. Figure 14-5 shows the MAXQ7667 ADC bipolar transfer function.

Table 14-3 shows the bipolar relationship between the differential analog input voltage and the digital output code. In bipolar mode,

the inputs are measured in a truly differential fashion where either input can exceed the other by up to REF/2.

Figure 14-5. Bipolar Transfer Function

800

801

FFE

001

000

FFF

7FE

7FF

-FS

+FS

OUTPUT CODE (hex)

DIFFERENTIAL INPUT VOLTAGE (LSB)

+FS - 1.5 LSB

FULL-SCALE

TRANSITION

+FS = REF/2

ZS = 0

-FS + 0.5 LSB

-FS = -REF/2

1 LSB = REF/4096

Table 14-3. Bipolar Code Table

BIN A RY DIGITAL

OUTPUT CODE

D11–D0

HEXADECI MA L

EQUIVALENT O F

D11–D0

DECI MA L

EQUIVALENT O F

D11–D0 (CODE

)

DIFFERENTI A L INPUT

VOLTAGE (V)

(EXTERN A L, R EF = 2.5V)

0111 1111 1111 0x7FF +2047 +1.24939 ± 0.5 LSB

0111 1111 1110 0x7FE +2046 +1.248779 ± 0.5 LSB

0000 0000 0001 0x001 +1 +0.00061 ± 0.5 LSB

0000 0000 0000 0x000 0 0.000 ± 0.5 LSB

1111 1111 1111 0xFFF -1 -0.00061 ± 0.5 LSB

1000 0000 0001 0x801 -2047 -1.24939 ± 0.5 LSB

1000 0000 0000 0x800 -2048 -1.25 ± 0.5 LSB

1 2 ... 240 241 242 243 244 245 246 247 248 249 250 ... 346 347

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