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AD566A Datasheet

High Speed 12-Bit Monolithic D/A Converters

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AD566A datasheet pdf
AD566A
FIGURE 6. OTHER VOLTAGE RANGES
The AD566A can also be easily configured for a unipolar 0 V to
+5 V range or ± 2.5 V and ± 10 V bipolar ranges by using the
additional 5 kΩ application resistor provided at the 20 V span R
terminal, Pin 11. For a 5 V span (0 V to +5 V or ± 2.5 V), the two
5 kΩ 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
resistor either to ground for unipolar or to VREF for the bipolar
range. For the ±10 V range (20 V span), use the 5 kΩ resistors in
series by connecting only Pin 11 to the op amp output and the
bipolar offset connected as shown. The ± 10 V option is shown
in Figure 6.
R1
5k
BIPOLAR OFF
14k
AD566A
9.95k5k
R2
5k
REF
IN 19.95k
0.5mA
–V 7.5V EREF
AD561
20k
IREF
REF
GND
POWER
GND
5k
IO 8k
DAC
IOUT =
4 ؋ IREF
؋ CODE
CODE
INPUT
20V SPAN
10V SPAN
10pF
DAC
OUT
AD509
2.4k
R3
26k*
–VEE
MSB
LSB
* THE PARALLEL COMBINATION OF THE BIPOLAR OFFSET RESISTOR
AND R3 ESTABLISHES A CURRENT TO BALANCE THE MSB CURRENT.
THE EFFECT OF TEMPERATURE COEFFICIENT MISMATCH BETWEEN
THE BIPOLAR RESISTOR COMBINATION AND DAC RESISTORS IS
EXPANDED ON PREVIOUS PAGE.
Figure 6. ±10 V Voltage Output
Table I. Digital Input Codes
DIGITAL INPUT
MSB
LSB
Straight Binary
ANALOG OUTPUT
Offset Binary
000000000000
011111111111
100000000000
111111111111
Zero
Mid Scale – 1 LSB
+1/2 FS
+FS – l LSB
–FS
Zero – 1 LSB
Zero
+FS – 1 LSB
*Inverts the MSB of the offset binary code with an external inverter to obtain twos complement.
Twos Complement*
Zero
+FS – 1 LSB
–FS
Zero – 1 LSB
–10–
REV. F
Analog Devices
Analog Devices



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