AD565-566A Ver la hoja de datos (PDF) - Analog Devices

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AD565-566A

High Speed 12-Bit Monolithic D/A Converters

Analog Devices 

AD565A/AD566A

FIGURE 6. OTHER VOLTAGE RANGES

The AD566A 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 V to +5 V or

± 2.5 V), 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 resistor either to ground for unipolar or to VREF

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 6.

Table I. Digital Input Codes

DIGITAL INPUT

MSB

LSB Straight Binary

ANALOG OUTPUT

Offset Binary

Twos Compl.*

000000000000

011111111111

100000000000

111111111111

Zero

Mid Scale – 1 LSB

+1/2 FS

+FS – l LSB

–FS

Zero – 1 LSB

Zero

+ FS – 1 LSB

Zero

+FS – 1 LSB

–FS

Zero – 1 LSB

*Inverts the MSB of the offset binary code with an external inverter to obtain

twos complement.

R1

5k⍀

BIPOLAR OFF

14k⍀

AD566A

9.95k⍀ 5k⍀

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.

Fgure 6. ±10 V Voltage Output

–10–

REV. D

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