DAC16GS Просмотр технического описания (PDF) - Analog Devices

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DAC16GS

16-Bit High Speed Current-Output DAC

Analog Devices 

DAC16

0.1␮F

+5V

10␮F

+15V

CLK

EN

R1

R2

5k⍀

5k⍀

REF02

22␮F

47␮F

DIGITAL +5V

PIN 3, DAC16

0.1␮F

–15V

DIGITAL INPUT WORD

DB0 – DB7

DB8 – DB15

74AC11377

74AC11377

8

8

R3

2.5k⍀

(5k⍀،2)

+15V

0.1␮F

10␮F

IREF

REF GND

CCOMP

100nF

CERAMIC

IOUT

DAC16

AGND

0.1␮F

OP97A

0.1␮F

10␮F

VOUT

0V TO +10V FS

10␮F

–15V

–15V

RESISTORS:

CADDOCK T912–5K–010–02 (OR EQUIVALENT)

5k⍀, 0.01%, TC TRACK = 2 ppm/؇C

Figure 24. Unipolar Circuit Configuration

0.1␮F

+5V

10␮F

DIGITAL INPUT WORD

+5VREF

DB0 – DB7

DB8 – DB15

CLK

EN

+15

V

+5VREF

REF02

R1

5k⍀

R2

5k⍀

22␮F

74AC11377

74AC11377

8

8

IREF

REF GND

CCOMP

IOUT

DAC16

AGND

R3

2.5k⍀

(5k⍀،2)

R4

2.5k⍀

(5k⍀،2)

+15V

0.1␮F

10␮F

OP97A

0.1␮F

VOUT

؎5V FS

47␮F

DIGITAL +5V

PIN 3, DAC16

0.1␮F

100nF

CERAMIC

–15V

0.1␮F

10␮F

10␮F

–15V

–15V

RESISTORS:

CADDOCK T912–5K–010–02 (OR EQUIVALENT)

5k⍀ , 0.01%, TC TRACK = 2 ppm/؇C

Figure 25. Bipolar Circuit Configuration

Bipolar Configuration

For applications that require a bipolar output voltage, the circuit

in Figure 24 can be modified slightly by adding a resistor from

the reference to the inverting sum node of the output amplifier

to level shift the output signal. The transfer equation for the cir-

cuit now becomes:

VO

=

R4 × 8 × IREF

 65,535 – Digital





65, 536

Code 





–

VREF

×





R4

R3





The circuit has the form shown in Figure 25, and Table IV pro-

vides the relationship between the digital input code and the

circuit’s output voltage for the component values shown.

Table IV. Bipolar Output Operation vs. Digital Input Code

Digital Input

Word (Hex)

Decimal Number in

DAC Decoder

Analog Output

Voltage (V)

0000

7FFE

7FFF

8000

FFFF

65,535

32,769

32,768

32,767

0

4.999848

152E-6

0

–152E-6

–5.00000

REV. B

–9–

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