AS1544 datasheet(16/29 Pages) AMSCO

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AS1543/44

Data Sheet - D e t a i l e d D e s c r i p t i o n

Transfer Functions

Output coding and transfer function depend on the control register bits RANGE (page 14), SE/FDN (page 14) and

CODING (page 14).

Figure 24. Straight Binary Transfer Function for

Figure 25. Straight Binary Transfer Function for

SE/FDN = 1 and CODING = 1

SE/FDN = 0 and CODING = 1

Figure 26. Two’s Complement Transfer Function for

Figure 27. Two’s Complement Transfer Function for

SE/FDN = 1 and CODING = 0

SE/FDN = 0 and CODING = 0

11...111

11...110

11....101

00...011

00...010

00...001

00...000

11...111

11...110

11....101

00...011

00...010

00...001

00...000

Input Voltage VINx (LSB)

FS - 3/2LSB

Full Scale = VREF

Zero Scale = 0

1LSB = VREF/4096

ZS+1LSB

Input Voltage VINx - VINy (LSB)

FS - 3/2LSB

Full Scale

(FS)

Transition

Full Scale = +VREF/2

Zero Scale = -VREF/2

1LSB = VREF/4096

RANGE = 1; VREF=VREFIN

RANGE = 0; VREF=2xVREFIN

Full Scale

(FS)

Transition

RANGE = 1; VREF=VREFIN

RANGE = 0; VREF=2xVREFIN

011....111

011...110

000...010

000...001

000...000

111...111

111...110

111...101

100...001

100...000

-FS

Input Voltage VINx (LSB)

+FS - 1LSB

011....111

011...110

000...010

000...001

000...000

111...111

111...110

111...101

100...001

100...000

-FS

Input Voltage VINx - VINy (LSB)

+FS - 1LSB

RANGE = 1; VREF=VREFIN

RANGE = 0; VREF=2xVREFIN

Full Scale = VREF

-Full Scale = 0

Zero Scale = VREF/2

1LSB = VREF/4096

RANGE = 1; VREF=VREFIN

RANGE = 0; VREF=2xVREFIN

Full Scale = +VREF/2

-Full Scale = -VREF/2

Zero Scale = 0

1LSB = VREF/4096

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