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參數資料
| 型號： | AD8600AP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | DAC |
| 英文描述： | 16-Channel, 8-Bit Multiplying DAC |
| 中文描述： | PARALLEL, 8 BITS INPUT LOADING, 2 us SETTLING TIME, 8-BIT DAC, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 236K |
| 代理商： | AD8600AP |
AD8600
REV. 0
–11–
Unipolar Output Operation
T he AD8600 is configured to give unipolar operation. T he full-
scale output voltage is equivalent to the reference input voltage
minus 1 LSB. T he output is dependent upon the digital code
and follows T able III. T he actual numbers given for the analog
output are calculated assuming a +2.5 V reference.
T able III. Unipolar Code T able
DAC
Binary Input
MSB LSB
Analog Output
1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0
+V
REF
(255/256) = +2.49 V
+V
REF
(129/256) = +1.26 V
+V
REF
(128/256) = +1.25 V
+V
REF
(127/256) = +1.24 V
+V
REF
(001/256) = +0.01 V
+V
REF
(000/256) = +0.00 V
Bipolar Output Operation
T he AD8600 can be configured for bipolar operation with the
addition of an op amp for each output as shown in Figure 20.
T he output will now have a swing of
±
V
REF
, as detailed in T able
IV. T his modification is only needed on those channels that re-
quire bipolar outputs. For channels which only require unipolar
output, no external amplifier is needed. T he OP495 quad am-
plifier is chosen for the external amplifier because of its low
power, rail-to-rail output swing, and DC accuracy. Again, the
values calculated for the analog output are based upon an as-
sumed +2.5 V reference.
OUT
1/4
OP495
+5V
–5V
R1
10k
V
OUT
R1
10k
V
REF
V
REF
AD8600
Figure 20. Circuit for Bipolar Output Operation
T able IV. Bipolar Code T able
DAC
Binary Input
MSB LSB
Analog Output
1 1 1 1 1 1 1 1
1 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0
0 1 1 1 1 1 1 1
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0
+2 V
REF
(255/256) – V
REF
= +2.49 V
+2 V
REF
(129/256) – V
REF
= +0.02 V
+2 V
REF
(128/256) – V
REF
= +0.00 V
+2 V
REF
(127/256) – V
REF
= –0.02 V
+2 V
REF
(001/256) – V
REF
= –2.48 V
+2 V
REF
(000/256) – V
REF
= –2.50 V
Interfacing to the 68HC11 Microcontroller
T he 68HC11 is a popular microcontroller from Motorola,
which is easily interfaced to the AD8600. T he connections be-
tween the two components are shown in Figure 21. Port C of
the 68HC11 is used as a bidirectional input/output data port to
write to and read from the AD8600. Port B is used for address-
ing and control information. T he bottom 4 LSBs of Port B are
the address, and the top 4 MSBs are the control lines (
LD
,
CS
,
EN
, and R/
W
). T he microcode for the 68 HC11 is shown in
Figure 22. T he comments in the program explain the function
of each step. T hree routines are included in this listing: read
from the AD8600, write to the AD8600, and a continuous loop
that generates a saw-tooth waveform. T his loop is used in the
application below.
DB0–DB7
A0–A3
LD
EN
R/
W
CS
DGND1, DGND2
DACGND
8
4
DIGITAL GROUND
ANALOG GROUND
AD8600
MOTOROLA
68HC11
PC0–PC7
PB0–PB3
PB4
PB5
PB6
PB7
GND
Figure 21. Interfacing the 68HC11 to the AD8600
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