DAC16

REV. B

–9–

Table IV. Bipolar Output Operation vs. Digital Input Code

Digital Input

Decimal Number in

Analog Output

Word (Hex)

DAC Decoder

Voltage (V)

0000

65,535

4.999848

7FFE

32,769

152E-6

7FFF

32,768

0

8000

32,767

–152E-6

FFFF

0

–5.00000

74AC11377

REF GND

R1

5k

+15V

0.1 F

REF02

22 F

R2

5k

DAC16

47 F

AGND

100nF

CERAMIC

–15V

10 F

0.1 F

+5V

DIGITAL +5V

PIN 3, DAC16

OP97A

10 F

0.1 F

+15V

10 F

0.1 F

–15V

0V TO +10V FS

10 F

0.1 F

–15V

R3

2.5k

(5k

2)

88

CLK

EN

74AC11377

DB0 – DB7

DB8 – DB15

DIGITAL INPUT WORD

RESISTORS:

CADDOCK T912–5K–010–02 (OR EQUIVALENT)

5k , 0.01%, TC TRACK = 2 ppm/ C

Figure 24. Unipolar Circuit Configuration

5V FS

74AC11377

REF GND

R1

5k

+15

V

0.1 F

REF02

22 F

R2

5k

DAC16

47 F

AGND

100nF

CERAMIC

–15V

10 F

0.1 F

+5V

DIGITAL +5V

PIN 3, DAC16

OP97A

10 F

0.1 F

+15V

10 F

0.1 F

–15V

10 F

0.1 F

–15V

R3

2.5k

(5k

2)

88

CLK

EN

74AC11377

DB0 – DB7

DB8 – DB15

DIGITAL INPUT WORD

RESISTORS:

CADDOCK T912–5K–010–02 (OR EQUIVALENT)

5k

, 0.01%, TC TRACK = 2 ppm/ C

R4

2.5k

(5k

2)

Figure 25. Bipolar Circuit Configuration

Bipolar Configuration

For applications that require a bipolar output voltage, the circuit

in Figure 24 can be modified slightly by adding a resistor from

the reference to the inverting sum node of the output amplifier

to level shift the output signal. The transfer equation for the cir-

cuit now becomes:

V

65,535 –

Digital Code

65,536

















–

V

R4

R3









The circuit has the form shown in Figure 25, and Table IV pro-

vides the relationship between the digital input code and the

circuit’s output voltage for the component values shown.