DAC8408FT View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

DAC8408FT

0-7V; quad 8-bit multiplying CMOS D/A converter with memory. For voltage set points in automatic test equipment

Analog Devices 

DAC8408

Figure 7. Quad DAC Bipolar Operation (4-Quadrant Multiplication)

Table II. Bipolar (Offset Binary) Code Table

(Refer to Figure 7)

DAC Data Input

MSB

LSB

Analog Output

(DAC A OR DAC B)

11111111

10000001

10000000

01111111

00000001

00000000

NOTE

1

1 LSB = (2–7) (VREF) = 128 (VREF)

 127 

+VREF  128 

+VREF

 1

 128 

0

 1

–VREF  128 

 127 

–VREF  128 

 128 

–VREF  128 

APPLICATION HINTS

General Ground Management: AC or transient voltages be-

tween AGND and DGND can appear as noise at the DAC8408’s

analog output. Note that in Figures 5 and 6, IOUT2A/IOUT2B and

IOUT 2C/IOUT 2D are connected to AGND. Therefore, it is rec-

ommended that AGND and DGND be tied together at the

DAC8408 socket. In systems where AGND and DGND are tied

together on the backplane, two diodes (1N914 or equivalent)

should be connected in inverse parallel between AGND and

DGND.

Write Enable Timing: During the period when both DS and

R/W are held low, the DAC latches are transparent and the ana-

log output responds directly to the digital data input. To pre-

vent unwanted variations of the analog output, the R/W should

not go low until the data bus is fully settled (DATA VALID).

REV. A

–11–

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