LTC1454CS datasheet(9/12 Pages) LINER

Il numero della parte	LTC1454CS

Spiegazioni elettronici	Dual 12-Bit Rail-to-Rail Micropower DACs

PDF	12 Pages

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Produttore elettronici	LINER [Linear Technology]

Homepage	http://www.linear.com

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LTC1454/LTC1454L

Figure 2

APPLICATIONS INFORMATION

A Single Supply, 4-Quadrant Multiplying DAC

The LTC1454 can also be used for 4-quadrant multiplying

with an offset signal ground of 1.22V. This application is

shown in Figure 2. The inputs are connected to REFHI B or

REFHI A and have a 1.22V amplitude around a signal

ground of 1.22V. The outputs will swing from 0V to 2.44V,

as shown by the equation with the figure. Since the signal

ground is around 1.22V, REFLO is offset above ground by

using an LT1034CS8-1.2 as shown.

VOUT B

VCC

REFHI B

GND

REFLO

REFHI A

REFOUT

VCC

VOUT B

VOUT A

VINB

1.22V

± 1.22V

VINA

1.22V

± 1.22V

LT1034CS8-1.2

CLK

DIN

CS/LD

LTC1454

1454 F02

X1/X2 B

CLR

CLK

DIN

CS/LD

DOUT

X1/X2 A

VOUT A

0.1

µF

10k

VOA/B = VIN – VREFLO GAIN

– 1 +1 + VREFLO

= VIN – 1.22 2.0

– 1.0 + 1.22V

()

DIN

4096

DIN

4096

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