AD565A(RevF) View Datasheet(PDF) - Analog Devices

Part Name

Description

MFG CO.

AD565A
(Rev.:RevF)

High Speed 12-Bit Monolithic D/A Converters

Analog Devices 

AD565A

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

9.95k⍀ 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.

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

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