LTC1821 datasheet(11/16 Pages) LINER

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LTC1821

Figure 2. Bipolar Operation (4-Quadrant Multiplication) VOUT = – VREF to VREF

Bipolar Mode

(4-Quadrant Multiplying, VOUT = – VREF to VREF)

The LTC1821 contains on chip all the 4-quadrant resistors

necessary for bipolar operation. 4-quadrant multiplying

APPLICATIONS INFORMATION

operation can be achieved with a minimum of external

components—a capacitor and a single op amp, as shown

in Figure 2. With a fixed 10V reference, the circuit shown

gives a precision bipolar – 10V to 10V output swing.

VCC

LTC1821

RFB

ROFS

718

117

RCOM

REF

0.1

µF

0.1

µF

15V

–15V

IOUT

VOUT

22pF

VOUT =

–VREF

TO VREF

1821 F02

AGNDF AGNDS

DGND

25 TO 36,

3 TO 6

CLR DNC* DNC*

CLR

VREF

16-BIT DAC

DATA

INPUTS

0.1

µF

DNC*

V–

V+

LT1001

Bipolar Offset Binary Code Table

DIGITAL INPUT

BINARY NUMBER

IN DAC REGISTER

VREF (32,767/32,768)

VREF (1/32,768)

–VREF (1/32,768)

–VREF

LSB

1111 1111

1111

0000 0000

0001

0000 0000

0000

1111 1111

1111

0000 0000

0000

ANALOG OUTPUT

VOUT

MSB

1111

1000

0111

0000

*DO NOT CONNECT

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