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AD565A Datasheet(PDF) 8 Page - Analog Devices

Part No. AD565A
Description  High Speed 12-Bit Monolithic D/A Converters
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD565A Datasheet(HTML) 8 Page - Analog Devices

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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
IREF
DAC
IOUT =
4
IREF
CODE
AD565A
9.95k
5k
8k
IO
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–VEE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
VCC
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
Ω 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
Ω 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
IREF
DAC
IOUT =
4
IREF
CODE
AD565A
9.95k
5k
8k
IO
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–VEE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
VCC
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
Ω trimmer R1 to give –5.000
volts output.
STEP II . . . GAIN ADJUST
Turn ON All bits. Adjust 100
Ω 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
IREF
DAC
IOUT =
4
IREF
CODE
AD565A
9.95k
5k
8k
IO
20V SPAN
10V SPAN
DAC
OUT
POWER
GND
–VEE
REF
GND
BIPOLAR OFF
5k
CODE
INPUT
LSB
MSB
10V
VCC
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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