®

14

DAC7631

FIGURE 6. Single-supply Buffered Reference, VREFL = 50mV.

FIGURE 9. Single-supply Buffered Reference, VREFL = +1.25V, VREFH = –1.25V.

FIGURE 7. Integral Linearity and Differential Linearity

Error Curves for Figure 6.

FIGURE 8. Integral Linearity and Differential Linearity

Error Curves for Figure 9.

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–2.0

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–2.0

LINEARITY ERROR AND

DIFFERENTIAL LINEARITY ERROR vs CODE

(DAC A, +25

°C)

0000

H

2000

H

4000

H

6000

H

8000

H

Digital Input Code

A000

H C000H

E000

H FFFFH

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–2.0

2.0

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

–2.0

LINEARITY ERROR AND

DIFFERENTIAL LINEARITY ERROR vs CODE

(DAC A, +25

°C)

0000

H

2000

H

4000

H

6000

H

8000

H

Digital Input Code

A000

H C000H

E000

H FFFFH

2k

Ω

+0.050V

+V

98k

Ω

+2.5V

+V

OPA2350

2200pF

2200pF

100

Ω

100

Ω

1000pF

1000pF

1

2

3

4

V

REFH

V

REFH Sense

V

REFL

V

REFL Sense

DAC7631

NOTE: V

REFL has been chosen to be 50mV to allow for current sinking voltage

drops across the 100

Ω resistor and the output stage of the buffer op amp.

+V

+V

+1.25V

+2.5V

+V

OPA2350

2200pF

2200pF

100

Ω

100

Ω

1000pF

1000pF

1

2

3

4

V

REFH

V

REFH Sense

V

REFL

V

REFL Sense

DAC7631