257

s Replaces 8 Potentiometers and 8 Op amps

s Operates from Single +5V Supply

s 5 MHz 4-Quadrant Multiplying Band-

width

s Eight Inputs/Eight Outputs (SP9840)

Four Inputs/Eight Outputs (SP9843)

s 3-Wire Serial Input

s 0.8MHz Data Update Rate

s +3.25V Output Swing

s Midscale Preset

s Programmable Signal Inversion

s Low 70mW Power Dissipation

(9mW/DAC)

–

+

4

8

8

8

DAC 1

DAC 8

8

8 x 8

DAC

REGISTER

SERIAL

REGISTER

LOGIC

Decoded

Address

Data

Clock

Serial Data Input

Serial Data Output

Preset

Load

V

V

V

V

V

SP9840 shown

DESCRIPTION…

The SP9840 and SP9843 are general purpose octal DACs in a single package. The SP9840

features eight individual reference inputs, while the SP9843 provides four pair of voltage

reference inputs. Both parts feature 5MHz bandwidth, four–quadrant multiplication, and a three–

wire serial interface. Other features include midscale preset, programmable signal inversion and

low power dissipation from a single +5V supply. Devices are available in commercial and

industrial temperature ranges.

SP9840/43

8-Bit Octal, 4-Quadrant Multiplying, BiCMOS DAC