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參數(shù)資料
| 型號(hào)： | AD565 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Speed 12-Bit Monolithic D/A Converters(高速12位單片D/A轉(zhuǎn)換器) |
| 中文描述： | 高速12位單片D / A轉(zhuǎn)換（高速12位單片的D / A轉(zhuǎn)換器） |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 340K |
| 代理商： | AD565 |
AD565A/AD566A
REV. C
–7–
8
11
10
9
12
7
4
6
5
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 x I
REF
x CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
OUT
PGND
–VEE
REF
BIPOLAR OFF
5k
CODE INPUT
LSB
MSB
13
24
3
10V
V
CC
REF OUT
10pF
AD509
OUTPUT
2.4k
100
100k
R1
+15V
–15V
REF IN
R2
Figure 1. 0 V to +10 V Unipolar Voltage 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).
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.
8
11
10
9
12
7
6
5
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 x I
REF
x CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
OUT
PGND
–VEE
REF
BIPOLAR OFF
5k
CODE INPUT
LSB
MSB
13
24
3
10V
V
CC
10pF
AD509
OUTPUT
2.4k
REF IN
R2
4
1R1
Figure 2.
±
5 V Bipolar Voltage Output
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 us-
ing 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 off-
set 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.
8
11
10
9
12
7
4
6
5
19.95k
20k
0.5mA
I
REF
DAC
I
OUT
=
4 x I
REF
x CODE
AD565A
9.95k
5k
8k
I
O
20V SPAN
10V SPAN
OUT
PGND
–VEE
REF
BIPOLAR OFF
5k
CODE INPUT
LSB
MSB
13
24
3
10V
V
CC
10pF
AD509
OUTPUT
3.0k
REF IN
R2
R1
Figure 3.
±
10 V Voltage Output
CONNECTING THE AD566A FOR BUFFERED VOLTAGE
OUTPUT
The standard current-to-voltage conversion connections using
an operational amplifier are shown here with the preferred trim-
ming techniques. If a low offset operational amplifier (AD510L,
AD517L, AD741L, AD301AL, AD OP07) is used, excellent
performance can be obtained in many situations without trim-
ming (an op amp with less than 0.5 mV max offset voltage
should be used to keep offset errors below 1/2 LSB). If a 50
fixed resistor is substituted for the 100
trimmer, unipolar zero
will typically be within
±
1/2 LSB (plus op amp offset), and full
scale accuracy will be within 0.1% (0.25% max). Substituting a
50
resistor for the 100
bipolar offset trimmer will give a bi-
polar zero error typically within
±
2 LSB (0.05%).
The AD509 is recommended for buffered voltage-output appli-
cations which require a settling time to
±
1/2 LSB of one micro-
second. The feedback capacitor is shown with the optimum
value for each application; this capacitor is required to compen-
sate for the 25 picofarad DAC output capacitance.
FIGURE 4. UNIPOLAR CONFIGURATION
This configuration will provide a unipolar 0 volt to +10 volt out-
put range. In this mode, the bipolar terminal, Pin 7, should be
grounded if not used for trimming.
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 7 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 1 LSB 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.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD565-566A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed 12-Bit Monolithic D/A Converters |
| AD565A | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed 12-Bit Monolithic D/A Converters |
| ad565a5d/+ | 制造商:Analog Devices 功能描述: |
| AD565AJ | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed 12-Bit Monolithic D/A Converters |
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