267

s Replaces 8 Potentiometers and 8 Op Amps

s Operates from Single +5V Supply

s 6.3 MHz 2-Quadrant Multiplying Gain Band-

width

s No Signal Inversion

s Eight Reference Inputs, Eight Voltage

Outputs (SP9841)

s Four Reference Inputs, Eight Voltage

Outputs (SP9842)

s 3-Wire Serial Input

s 0.8MHz Data Update Rate

s +3.25 Volt Output Swing

s Midscale Preset

DESCRIPTION…

The SP9841 and SP9842 are general purpose octal DACs in a single package. The SP9841

features eight individual reference inputs, while the SP9842 provides four pair of voltage

reference inputs. Both parts feature 6.3MHz bandwidth, two–quadrant multiplication, and a

three–wire serial interface. Other features include midscale preset, no signal inversion and low

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

temperature ranges.

+

–

4

8

8

8

DAC A

8 x 8

DAC

REGISTER

SERIAL

REGISTER

LOGIC

Decoded

Address

Data

Clock

Serial Data Input

Serial Data Output

Preset

Load

V

SP9842

+

–

8

DAC B

V

V

V

+

–

8

DAC G

+

–

8

DAC H

V

V

V

SP9842 Block Diagram

4

8

8

8

DAC A

DAC H

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

SP9841

+

–

SP9841 Block Diagram

SP9841/42

8-Bit Octal, 2-Quadrant Multiplying, BiCMOS DAC