DAC08ES-REEL 查看數據表（PDF） - Analog Devices

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DAC08ES-REEL

8-Bit, High Speed, Multiplying D/A Converter (Universal Digital Logic Interface)

Analog Devices 

BASIC CONNECTIONS

+VREF

RREF

IIN

IREF

VIN

14

RIN

15

RREF ≈ R15 +VREF

IREF ≥ PEAK NEGATIVE SWING OF IIN

RREF

14

R15

(OPTIONAL)

VIN

15

HIGH INPUT

IMPEDANCE

+VREF MUST BE ABOVE PEAK POSITIVE SWING OF VIN

Figure 23. Accommodating Bipolar References

DAC08

MSB

LSB

B1 B2 B3 B4 B5 B6 B7 B8

IREF

+VREF

RREF

VREF (+) 14 5

6

7

8

9 10 11 12

4

IO

(R14)

VREF (–) 15 3

16 13

1

2

R15

IO

V–

V+

CC

FOR FIXED REFERENCE,

TTL OPERATION,

IFR

=

+VREF

RREF

×

255

256

0.1µF

IO + IO = IFR FOR

ALL LOGIC STATES

COMP

0.1µF

V–

V+

TYPICAL VALUES ARE:

VREF = 10.000V

RREF = 5.000kΩ

R15 = RREF

CC = 0.01µF

VLC VLC = 0V (GROUND)

Figure 24. Basic Positive Reference Operation

MSB

LSB

B1 B2 B3 B4 B5 B6 B7 B8

EO

IREF = 2.000mA

14

IO 4

5.000kΩ

5.000kΩ

2

IO

EO

FULL RANGE

HALF SCALE +LSB

HALF SCALE

HALF SCALE –LSB

ZERO SCALE +LSB

ZERO SCALE

B1 B2 B3 B4 B5 B6 B7 B8 IO

1 1 1 1 1 1 1 1 1.992

1 0 0 0 1 0 0 1 1.008

1 0 0 0 1 0 0 0 1.000

0 1 1 1 0 1 1 1 0.992

0 0 0 0 0 0 0 1 0.008

0 0 0 0 0 0 0 0 0.000

IO

0.000

0.984

0.992

1.000

1.984

1.992

EO

–9.960

–5.040

–5.000

–4.960

–0.040

0.000

EO

–0.000

–4.920

–4.960

–5.000

–9.920

–9.960

Figure 25. Basic Unipolar Negative Operation

10V

MSB

LSB

B1 B2 B3 B4 B5 B6 B7 B8

IREF = 2.000mA

14

10kΩ

IO

4

EO

2

IO

EO

10kΩ

B1 B2 B3 B4 B5 B6 B7 B8 EO

EO

POS. FULL RANGE

1 1 1 1 1 1 1 1 –9.920 +10.000

POS. FULL RANGE –LSB 1 1 1 1 1 1 1 0 –9.840 +9.920

ZERO SCALE +LSB

1 0 0 0 0 0 0 1 –0.080 +0.160

ZERO SCALE

1 0 0 0 0 0 0 0 0.000 +0.080

ZERO SCALE –LSB

0 1 1 1 1 1 1 1 +0.080 0.000

NEG. FULL SCALE +LSB 0 0 0 0 0 0 0 1 +9.920 –9.840

NEG. FULL SCALE

0 0 0 0 0 0 0 0 +10.000 –9.920

Figure 26. Basic Bipolar Output Operation

VREF

10V

39kΩ

10kΩ

POT

LOW T.C.

4.5kΩ

14

IREF (+) ≈ 2mA

≈1V

15

APPROX

5kΩ

Figure 27. Recommended Full-Scale Adjustment Circuit

RREF

–VREF

R15

IFS ≈

–VREF

RREF

14

IO

4

IO

15

2

NOTE

RREF SETS IFS; R15 IS FOR

BIAS CURRENT CANCELLATION.

Figure 28. Basic Negative Reference Operation

Rev. C | Page 11 of 20

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