AD565-566A AD [Analog Devices], AD565-566A Datasheet - Page 8

• Manufacturer Part Number: AD565-566A
• Description: High Speed 12-Bit Monolithic D/A Converters
• Manufacturer: AD [Analog Devices]

AD565A/AD566A
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.
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).
100
100
GND
GND
R2
REF
R2
REF
REF
REF
IN
IN
Figure 1. 0 V to +10 V Unipolar Voltage Output
–V
–V
Figure 2. ± 5 V Bipolar Voltage Output
REF
OUT
EE
REF
OUT
EE
19.95k
19.95k
20k
20k
POWER
POWER
10V
10V
GND
GND
V
AD565A
AD565A
CC
V
CC
0.5mA
0.5mA
I
I
REF
REF
100
9.95k
R1
9.95k
MSB
MSB
INPUT
INPUT
CODE
CODE
I
4
I
4
OUT
OUT
DAC
DAC
BIPOLAR OFF
BIPOLAR OFF
5k
CODE
5k
CODE
5k
5k
I
I
REF
REF
=
=
I
LSB
I
LSB
O
O
8k
8k
100
100k
DAC
OUT
DAC
OUT
10V SPAN
20V SPAN
10V SPAN
20V SPAN
2.4k
2.4k
+15V
–15V
10pF
10pF
AD509
AD509
R1
50k
OUTPUT
0V TO
+10V
OUTPUT
–5V TO
+5V
–8–
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.
100
GND
R2
REF
REF
IN
–V
REF
OUT
EE
19.95k
20k
POWER
10V
Figure 3. ± 10 V Voltage Output
GND
V
AD565A
CC
0.5mA
I
REF
100
9.95k
R1
MSB
INPUT
CODE
I
4
OUT
DAC
BIPOLAR OFF
5k
5k
CODE
I
REF
=
I
LSB
O
8k
DAC
OUT
10V SPAN
20V SPAN
3.0k
10pF
AD509
REV. D
OUTPUT
–10V TO
+10V