3

Functional Diagram

POWER SUPPLY CHARACTERISTICS

Power Supply Rejection

V+ = 14.5V to 15.5V

(Note 3) (Figure 3)

-

±0.005

-

-

±0.005

-

%

FSR/%

∆V+

Power Supply Voltage Range

+5 to +15

+5 to +15

V

I+

All Digital Inputs at 0V or V+

Excluding Ladder Network

-

±1-

-

±1-

µA

All Digital Inputs High or Low

Excluding Ladder Network

--

2

-

-

2

mA

Total Power Dissipation

Including the Ladder Network

-

20

-

-

20

-

mW

NOTES:

2. Full Scale Range (FSR) is 10V for Unipolar and

±10V for Bipolar modes.

4. Guaranteed by design, or characterization and not production tested.

5. Accuracy not guaranteed unless outputs at GND potential.

6. Accuracy is tested and guaranteed at V+ = 15V only.

Electrical Specifications

PARAMETER

TEST CONDITIONS

AD7520

AD7521

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

Pin Descriptions

AD7520

AD7521

PIN NAME

DESCRIPTION

11

Current Out summing junction of the R2R ladder network.

22

Current Out virtual ground, return path for the R2R ladder network.

3

3

GND

Digital Ground. Ground potential for digital side of D/A.

4

4

Bits 1(MSB)

Most Significant Digital Data Bit.

5

5

Bit 2

Digital Bit 2.

6

6

Bit 3

Digital Bit 3.

7

7

Bit 4

Digital Bit 4.

8

8

Bit 5

Digital Bit 5.

9

9

Bit 6

Digital Bit 6.

10

10

Bit 7

Digital Bit 7.

11

11

Bit 8

Digital Bit 8.

12

12

Bit 9

Digital Bit 9.

13

13

Bit 10

Digital Bit 10 (AD7521). Least Significant Digital Data Bit (AD7520).

-

14

Bit 11

Digital Bit 11 (AD7521).

-

15

Bit 12

Least Significant Digital Data Bit (AD7521).

14

16

V+

Power Supply +5V to +15V.

15

17

Voltage Reference Input to set the output range. Supplies the R2R resistor ladder.

16

18

20k

Ω

GND

BIT 3

BIT 2

MSB

20k

Ω

20k

Ω

20k

Ω

20k

Ω

20k

Ω

10k

Ω

10k

Ω

10k

Ω

10k

Ω

SPDT NMOS

SWITCHES

10k

Ω

NOTES:

Switches shown for Digital Inputs “High”.

Resistor values are typical.

AD7520, AD7521