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DAC08A 데이터 시트보기 (PDF) - Analog Devices

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DAC08A 8-Bit, High Speed, Multiplying D/A Converter ADI
Analog Devices ADI
DAC08A Datasheet PDF : 21 Pages
First Prev 11 12 13 14 15 16 17 18 19 20
Data Sheet
DAC08
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
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 (–)
2
15 3 16 13 1
R15
IO
V–
V+
CC
FOR FIXED REFERENCE,
TTL OPERATION,
COMP
TYPICAL VALUES ARE:
VREF = 10.000V
IFR
=
+VREF
RREF
×
255
256
0.1µF
IO + IO = IFR FOR
ALL LOGIC STATES
0.1µF
V–
V+ VLC
RREF = 5.000k
R15 = RREF
CC = 0.01µF
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
5.000k
5.000k
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
IO
EO
EO
1 1 1 1 1 1 1 1 1.992 0.000 –9.960 –0.000
1 0 0 0 1 0 0 1 1.008 0.984 –5.040 –4.920
1 0 0 0 1 0 0 0 1.000 0.992 –5.000 –4.960
0 1 1 1 0 1 1 1 0.992 1.000 –4.960 –5.000
0 0 0 0 0 0 0 1 0.008 1.984 –0.040 –9.920
0 0 0 0 0 0 0 0 0.000 1.992 0.000 –9.960
Figure 25. Basic Unipolar Negative Operation
MSB
LSB
B1 B2 B3 B4 B5 B6 B7 B8
IREF = 2.000mA
IO 4
14
2
IO
10V
10k
EO
EO
10k
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
Rev. D | Page 11 of 21
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