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參數(shù)資料
| 型號： | AD565ATQ |
| 英文描述： | 12-Bit Digital-to-Analog Converter |
| 中文描述： | 12位數(shù)字到模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 152K |
| 代理商： | AD565ATQ |
AD565A/AD566A
REV. D
–8–
FIGURE 1. UNIPOLAR CONFIGURATION
This configuration will provide a unipolar 0 volt to +10 volt
output range. In this mode, the bipolar terminal, Pin 8, should
be grounded if not used for trimming.
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 I
REF
CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–
V
EE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
V
CC
REF
OUT
REF
IN
R2
100
10pF
AD509
OUTPUT
0V TO
+10V
100
100k
+15V
–
15V
R1
50k
2.4k
Figure 1. 0 V to +10 V Unipolar Voltage Output
STEP I . . . ZERO ADJUST
Turn all bits OFF and adjust zero trimmer R1, until the output
reads 0.000 volts (1 LSB = 2.44 mV). In most cases this trim is
not needed, but Pin 8 should then be connected to Pin 12.
STEP II . . . GAIN ADJUST
Turn all bits ON and adjust 100
gain trimmer R2, until the
output is 9.9976 volts. (Full scale is adjusted to 1LSB less than
nominal full scale of 10.000 volts.) If a 10.2375 V full scale is
desired (exactly 2.5 mV/bit), insert a 120
resistor in series
with the gain resistor at Pin 10 to the op amp output.
FIGURE 2. BIPOLAR CONFIGURATION
This configuration will provide a bipolar output voltage from
–5.000 to +4.9976 volts, with positive full scale occurring with
all bits ON (all 1s).
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
4 I
REF
CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–
V
EE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
V
CC
REF
OUT
REF
IN
R2
100
10pF
AD509
OUTPUT
–
5V TO
+5V
2.4k
R1
100
Figure 2.
±
5 V Bipolar Voltage Output
STEP I . . . OFFSET ADJUST
Turn OFF all bits. Adjust 100
trimmer R1 to give –5.000
volts output.
STEP II . . . GAIN ADJUST
Turn ON All bits. Adjust 100
gain trimmer R2 to give a read-
ing of +4.9976 volts.
Please note that it is not necessary to trim the op amp to obtain
full accuracy at room temperature. In most bipolar situations,
an op amp trim is unnecessary unless the untrimmed offset drift
of the op amp is excessive.
FIGURE 3. OTHER VOLTAGE RANGES
The AD565A can also be easily configured for a unipolar 0 volt
to +5 volt range or
±
2.5 volt and
±
10 volt bipolar ranges by
using the additional 5k application resistor provided at the 20
volt span R terminal, Pin 11. For a 5 volt span (0 to +5 or
±
2.5), the two 5k resistors are used in parallel by shorting Pin
11 to Pin 9 and connecting Pin 10 to the op amp output and the
bipolar offset either to ground for unipolar or to REF OUT for
the bipolar offset either to ground for unipolar or to REF OUT
for the bipolar range. For the
±
10 volt range (20 volt span) use
the 5k resistors in series by connecting only Pin 11 to the op
amp output and the bipolar offset connected as shown. The
±
10
volt option is shown in Figure 3.
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 I
REF
CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–
V
EE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
V
CC
REF
OUT
REF
IN
R2
100
10pF
AD509
OUTPUT
–
10V TO
+10V
3.0k
R1
100
Figure 3.
±
10 V Voltage Output
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