LTC1454L データシートの表示（PDF） - Linear Technology

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LTC1454L

Dual 12-Bit Rail-to-Rail Micropower DACs

Linear Technology 

LTC1454/LTC1454L

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.

5V

CLK

DIN

CS/LD

VOUT A

X1/X2 B

CLR

CLK

VOUT B

VCC

REFHI B

DIN

GND

LTC1454

CS/LD

REFLO

DOUT

X1/X2 A

REFHI A

REFOUT

VOUT A

VCC

VOUT B

0.1µF

10k

VINB

1.22V ± 1.22V

VINA

1.22V ± 1.22V

LT1034CS8-1.2

( ) ( ) VOA/B = VIN – VREFLO

GAIN

DIN

4096

–

1

+1

+ VREFLO

( )( ) = VIN – 1.22

2.0

DIN

4096

–

1.0

+ 1.22V

1454 F02

Figure 2

9

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