Maxim-integrated MAXQ7667 Bedienungsanleitung PDF herunterladen (Seite 244)

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_________________________________________________________________________________________________________ 14-12

MAXQ7667 User’s Guide

14.5.4 Transfer Function

The MAXQ7667 ADC output is straight binary in unipolar mode. Figure 14-4 shows the MAXQ7667 ADC unipolar transfer function.

Table 14-2 shows the unipolar relationship between the differential analog input voltage and the digital output code.

Figure 14-4. Unipolar Transfer Function

000

001

002

003

004

FFC

FFB

FFD

FFE

FFF

FS - 1.5 LSB

FULL-SCALE

TRANSITION

FS = REF

ZS = 0

1 LSB = REF/4096

OUTPUT CODE (hex)

DIFFERENTIAL INPUT VOLTAGE (LSB)

Table 14-2. Unipolar Code Table

BIN A RY DIGITAL

OUTPUT CODE

D11–D0

HEXADECI MAL

EQUIVALENT O F

D11–D0

DECI MA L

EQUIVALENT O F

D11–D0 (COD E

)

DIFFERENTI A L INPUT

VOLTAGE (V)

(EXTERN A L, R EF = 2.5V)

1111 1111 1111 0xFFF 4095 +2.49939 ± 0.5 LSB

1111 1111 1110 0xFFE 4094 +2.498779 ± 0.5 LSB

1000 0000 0001 0x801 2049 +1.25061 ± 0.5 LSB

1000 0000 0000 0x800 2048 +1.25 ± 0.5 LSB

0111 1111 1111 0x7FF 2047 +1.24939 ± 0.5 LSB

0000 0000 0001 0x001 1 +0.0061 ± 0.5 LSB

0000 0000 0000 0x000 0 +0.000 + 0.5 LSB

1 2 ... 239 240 241 242 243 244 245 246 247 248 249 ... 346 347

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