Datasheet

ManualsBrandsANALOG DEVICES ManualsData collecting ICsData acquisition IC - DA converter (DAC) SOIC 16

DAC08

Rev. C | Page 11 of 20

BASIC CONNECTIONS

00268-C-024

+V

REF

R

REF

I

IN

R

IN

V

IN

14

15

R15

(OPTIONAL)

HIGH INPUT

IMPEDANCE

+V

REF

MUST BE ABOVE PEAK POSITIVE SWING OF V

IN

R

REF

≈ R15

I

REF

≥ PEAK NEGATIVE SWING OF I

IN

I

REF

R

REF

V

IN

+V

REF

14

15

14

15

Figure 23. Accommodating Bipolar References

00268-C-025

R15

I

REF

FOR FIXED REFERENCE,

TTL OPERATION,

TYPICAL VALUES ARE:

V

REF

= 10.000V

R

REF

= 5.000kΩ

R15 = R

REF

C

C

= 0.01µF

V

LC

= 0V (GROUND)

MSB

B1

B2 B3 B4B5 B6 B7

LSB

B8

V–

C

C

COMP

0.1µF

V– V+

V

LC

I

O

V+

V

REF

(+)

+V

REF

R

REF

(R14)

V

REF

(–)

14

15

4

2

56789101112

316131

I

O

0.1µF

I

FR

=

×

I

O

+ I

O

= I

FR

FOR

A

LL LOGIC STATES

+V

REF

R

REF

255

256

Figure 24. Basic Positive Reference Operation

00268-C-026

I

REF

= 2.000mA

MSB

B1 B2 B3 B4 B5 B6 B7

LSB

B8

5.000kΩ

E

O

E

O

5.000kΩ

4

2

I

O

I

O

14

FULL RANGE

HALF SCALE +LSB

HALF SCALE

HALF SCALE –LSB

ZERO SCALE +LSB

ZERO SCALE

B1

1

1

1

0

0

0

B2

1

0

0

1

0

0

B3

1

0

0

1

0

0

B4

1

0

0

1

0

0

B5

1

1

1

0

0

0

B6

1

0

0

1

0

0

B7

1

0

0

1

0

0

B8

1

1

0

1

1

0

I

O

1.992

1.008

1.000

0.992

0.008

0.000

I

O

0.000

0.984

0.992

1.000

1.984

1.992

E

O

–9.960

–5.040

–5.000

–4.960

–0.040

0.000

E

O

–0.000

–4.920

–4.960

–5.000

–9.920

–9.960

Figure 25. Basic Unipolar Negative Operation

00268-C-027

I

REF

= 2.000mA

MSB

B1

B2 B3 B4 B5 B6 B7

LSB

B8

10V

10kΩ 10kΩ

E

O

E

O

4

2

I

O

I

O

14

POS. FULL RANGE

POS. FULL RANGE –LSB

ZERO SCALE +LSB

ZERO SCALE

ZERO SCALE –LSB

NEG. FULL SCALE +LSB

NEG. FULL SCALE

B1

1

1

1

1

0

0

0

B2

1

1

0

0

1

0

0

B3

1

1

0

0

1

0

0

B4

1

1

0

0

1

0

0

B5

1

1

0

0

1

0

0

B6

1

1

0

0

1

0

0

B7

1

1

0

0

1

0

0

B8

1

0

1

0

1

1

0

E

O

–9.920

–9.840

–0.080

0.000

+0.080

+9.920

+10.000

E

O

+10.000

+9.920

+0.160

+0.080

0.000

–9.840

–9.920

Figure 26. Basic Bipolar Output Operation

00268-C-028

APPROX

5kΩ

≈1V

I

REF

(+) ≈ 2mA

39kΩ

10kΩ

POT

LOW T.C.

4.5kΩ

V

REF

10V

14

15

Figure 27. Recommended Full-Scale Adjustment Circuit

00268-C-029

R

REF

I

O

I

O

R15

–V

REF

I

FS

≈

–V

REF

R

REF

NOTE

R

REF

SETS I

FS

; R15 IS FOR

BIAS CURRENT CANCELLATION.

14

15

4

2

Figure 28. Basic Negative Reference Operation