ADR512ART-REEL7 datasheet(4/8 Pages) AD

Nome de Peças	ADR512ART-REEL7

Descrição Electrónicos	1.2 V Precision Low Noise Shunt Voltage Reference

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Fabricante Electrônico	AD [Analog Devices]

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REV. 0

–4–

ADR512

PARAMETER DEFINITIONS

Temperature Coefficient

This is the change of output voltage with respect to operating

temperature changes, normalized by the output voltage at 25

°C.

This parameter is expressed in ppm/

°C and can be determined

with the following equation:

TCV

ppm

C

VT

VC

T

O

OO

O

°











 =

()− ()

°

()×−

()

×

21

6

25

10

(1)

where:

VO(25

°C) = V

O at 25

°C

VO(T1) = VO at Temperature 1

VO(T2) = VO at Temperature 2

Thermal Hysteresis

Thermal hysteresis is defined as the change of output voltage

after the device is cycled through the temperature from +25

°C to

–40

°C to +85°C and back to +25°C. This is a typical value from

a sample of parts put through such a cycle.

VV

C

V

ppm

VC

V

VC

O

HYS

O

TC

O

HYS

OO

TC

O

__

_

=°

()−

[] =

°

()−

°

()

×

25

10

6

(2)

where:

VO(25

°C) = V

O at 25

°C

VO_TC = VO at 25

°C after temperature cycle at +25°C

to –40

°C to +85°C and back to +25°C

APPLICATIONS SECTION

The ADR512 is a 1.2 V precision shunt voltage reference. It

is designed to operate without an external output capacitor be-

tween the positive and negative terminals for stability. An external

capacitor can be used for additional filtering of the supply.

As with all shunt voltage references, an external bias resistor

(RBIAS) is required between the supply voltage and the ADR512

(see Figure 1). RBIAS sets the current that is required to pass

through the load (IL) and the ADR512 (IQ). The load and the

supply voltage can vary, thus RBIAS is chosen based on

• RBIAS must be small enough to supply the minimum IQ cur-

rent to the ADR512 even when the supply voltage is at its

minimum and the load current is at its maximum value.

• R

BIAS also needs to be large enough so that IQ does not

exceed 10 mA when the supply voltage is at its maximum

and the load current is at its minimum.

Given these conditions, RBIAS is determined by the supply

voltage (Vs), the load and operating current (IL and IQ) of the

ADR512, and the ADR512’s output voltage.

R(V

V

) (I

I )

BIAS

S

OUT

L

Q

=+

–/

(3)

∆IIN = 100 A

VOUT = 20mV/DIV

TIME (2 s/DIV)

TPC 7. Output Response to 100

µA Input Current

Change With 1

µF Capacitor

2 V/DIV

TIME (400ms/DIV)

TPC 8. 1 Hz to 10 Hz Noise

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