ADR510

Rev. B | Page 8 of 12

APPLICATIONS INFORMATION

The ADR510 is a 1.0 V precision shunt voltage reference

designed to operate without an external output capacitor

between the positive terminal and the negative terminal for

stability. An external capacitor can be used for additional

filtering of the supply.

As with all shunt voltage references, an external bias resistor

following conditions:

•

current to the ADR510 even when the supply voltage is at

minimum value and the load current is at maximum value.

•

exceed 10 mA when the supply voltage is at its maximum

value and the load current is at its minimum value.

ADR510, and the ADR510 output voltage.

Q

L

OUT

S

BIAS

I

I

V

V

R

+

−

=

(3)

ADJUSTABLE PRECISION VOLTAGE SOURCE

The ADR510, combined with a precision low input bias op amp

such as the AD860x, can be used to output a precise adjustable

voltage. Figure 11 illustrates implementation of this application

using the ADR510.

the circuit, which is completely dependent on the R2 and R1

resistors.

R1

R2

V

OUT

+

= 1

(4)

An additional capacitor in parallel with R2 can be added to

filter out high frequency noise. The value of C2 is dependent on

the value of R2.

ADR510

1.0V

AD860x

R2

R1

C2

(OPTIONAL)

Figure 11. Adjustable Precision Voltage Source

OUTPUT VOLTAGE TRIM

Using a mechanical or digital potentiometer, the output voltage

of the ADR510 can be trimmed ±0.5%. The circuit in Figure 12

illustrates how the output voltage can be trimmed using a

10 kΩ potentiometer. Note that trimming using other resistor

values may not produce an accurate output from the ADR510.

ADR510

POT

10kΩ

R1

470kΩ

1

2

3

Figure 12. Output Voltage Trim

USING THE ADR510 WITH PRECISION DATA

CONVERTERS

The compact ADR510 and its low minimum operating current

requirement make it ideal for use in battery-powered portable

instruments, such as the AD7533 CMOS multiplying DAC, that

use precision data converters.

Figure 13 shows the ADR510 serving as an external reference to

the AD7533, a CMOS multiplying DAC. Such a DAC requires a

negative voltage input in order to provide a positive output

range. In this application, the ADR510 is supplying a −1.0 V

reference to the REF input of the AD7533.

0

1

MSB

9

LSB

+

–

AD7533

R2

ADR510

+

–

1

32

1

15

Figure 13. ADR510 as a Reference for a 10-Bit CMOS DAC (AD7533)