DAC08CSZ datasheet(8/12 Pages) AD

8 / 12 page

REV. B

DAC08

–8–

V+, POSITIVE POWER SUPPLY – V dc

020

I–

I+

ALL BITS “HIGH” OR “LOW”

TPC 10. Power Supply Current vs. V+

V–, NEGATIVE POWER SUPPLY – V dc

–0

–20

–2

–4

–6

–8 –10 –12 –14 –16 –18

BITS MAY BE “HIGH” OR “LOW”

I– WITH IREF = 2mA

I– WITH IREF = 0.2mA

I+

I– WITH IREF = 1mA

TPC 11. Power Supply Current vs. V–

+VREF

IREF

RREF

IIN

RIN

VIN

R15

(OPTIONAL)

RREF

+VREF

HIGH INPUT

IMPEDANCE

+VREF MUST BE ABOVE PEAK POSITIVE SWING OF V IN

RREF

R15

IREF PEAK NEGATIVE SWING OF IIN

Figure 7. Accommodating Bipolar References

RREF

(R14)

R15

IREF

+VREF

6789 10 11 12

FOR FIXED REFERENCE,

TTL OPERATION,

TYPICAL VALUES ARE:

VREF = 10.000V

RREF = 5.000k

R15 = RREF

CC = 0.01 F

VLC = 0V (GROUND)

MSB

B1 B2 B3 B4 B5 B6 B7

LSB

VREF (+)

VREF (–)

316

V–

COMP

0.1 F

V–

V+

VLC

IFR =

+VREF

RREF

255

256

IO + IO = IFR FOR

ALL LOGIC STATES

V+

Figure 8. Basic Positive Reference Operation

BASIC CONNECTIONS

TEMPERATURE – C

–50

100

150

I–

I+

ALL BITS “HIGH” OR “LOW”

IREF = 2.0mA

V– = –15V

V+ = +15V

TPC 12. Power Supply Current vs.

Temperature

IREF = 2.000mA

MSB

B1 B2 B3 B4 B5 B6 B7

LSB

5.000k

FULL RANGE

HALF-SCALE +LSB

HALF-SCALE

HALF-SCALE –LSB

ZERO-SCALE +LSB

ZERO-SCALE

IOmA

1.992

1.008

1.000

0.992

0.008

0.000

IOmA

0.000

0.984

0.992

1.000

1.984

1.992

–9.960

–5.040

–5.000

–4.960

–0.040

0.000

–0.000

–4.920

–4.960

–5.000

–9.920

–9.860

Figure 9. Basic Unipolar Negative Operation

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