9

LTC1454/LTC1454L

Figure 2

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.

REFHI B

GND

REFLO

REFHI A

REFOUT

1.22V

± 1.22V

1.22V

± 1.22V

LT1034CS8-1.2

CLK

CS/LD

LTC1454

1454 F02

X1/X2 B

CLR

CLK

CS/LD

X1/X2 A

5V

0.1

µF

10k

– 1.0 + 1.22V

()

()

()

()

4096

4096