10-9

Functional Diagram

NOTES:

Switches shown for Digital Inputs “High”.

Resistor values are typical.

Output Noise

Both Outputs

(Note 4) (Figure 4)

-

Equivalent

to 10k

Ω

-

-

Equivalent

to 10k

Ω

-

Johnson

Noise

DIGITAL INPUTS

Over the Specified

Temperature Range

-

-

0.8

-

-

0.8

V

2.4

-

-

2.4

-

-

V

--

±1-

-

±1

µA

Input Coding

See Tables 1 and 2

Binary/Offset Binary

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/AD7530

AD7521/AD7531

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

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

AD7520, AD7530, AD7521, AD7531