Zetex ZRT025A1, ZRT025C1, ZRT025C2, ZRT025GA1, ZRT025GC1 Datasheet

2.5V LOW POWER
PRECISION REFERENCE SOURCE

ISSUE 1 - OCTOBER 1995

ZRT025

DEVICE DESCRIPTION

The ZRT025 is a monolithic integrated circuit
providing a precise stable reference voltage
of 2.5V at 500µA.

The circuit features a knee current of 150µA
and operation over a wide range of
temperatures and currents.

The ZRT025 is available in a 3-pin metal can
package for through hole applications as
well as SOT223 and SO8 packages for
surface mount applications. Each package
option offers a trim facility whereby the
output voltage can be adjusted as shown in
Fig.1. This facility is used when
compensating for system errors or setting
the reference output to a particular value.
When the trim facility is not used, the pin
should be left open circuit.

SCHEMATIC DIAGRAM

R

CC

V

R

V

FEATURES

Trimmable output

•

Excellent temperature stability

•

Low output noise figure

•

Available in two temperature ranges

•

1 and 2% initial voltage tolerance

•

versions available
No external stabilising capacitor

•

required in most cases
Low slope resistance

•

No derating required at low

•

temperatures
TO18 package

•

SOT223 and SO8 small outline

•

packages

R=VCC-V

G

This circuit will allow the reference to be
trimmed over a wide range. The device is
specified over a 65% trim range.

R

R

I

nd

RT=100k

(Optional trim facility)

nd

G

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ZRT025

ABSOLUTE MAXIMUM RATING

Reverse Current 75mA ø
Operating Temperature

A grade -55°C to 125°C
C grade 0°C to 70°C

Storage Temperature

TO18 -55 °C to 175 °C

Power Dissipation (T

TO18 300mW
SO8 625mW
SOT223 2W
ø Above 72°C this figure should be linearly

derated to 25mA at 125°C

SO8, SOT223 -55 °C to 125 °C

TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS

SYMBOL PARAMETER

DV

Output voltage change

R

over relevant
temperature range
(See note (a))

T

CVR

Output voltage
temperature coefficient
(See note (b))

INITIAL

VOLTAGE

TOLERANCE

%

1 & 2 6.8 22.5 2.7 8.8 mV

1 & 2 15.0 50.0 15.0 50.0 ppm/°C

GRADE A

-55°C TO 125°C

GRADE C

0°C TO 70°C

TYP MAX TYP MAX

ELECTRICAL CHARACTERISTICS
( at T

SYMBOL PARAMETER

V

DV

T

I

R

t

on

t

off

e

np-p

R

=25°C and Trim pin o/c unless otherwise stated)

amb

MIN. TYP.

R

TRIM

Output voltage
1% tolerance (A1,C1)
2% tolerance (C2)

Output voltage adjustment

2.475

2.450

range

CDVTRIM

Change in TCVR with output
adjustment

Operating current range 0.15 75 mA

Turn-on time
Turn-off time

Output voltage noise (over the
range 0.1 to 10Hz)

S

Slope resistance 0.85 2.0

MAX. UNITS

2.500

2.525

V

2.500

2.550

65%

2.5 ppm/°C/%

10

µsR

0.3

50

µV

Ω

amb

=25°C)

UNITS

COMMENTS

=500µA

I

R

=100kΩ

R

T

=1kΩ

L

Peak to peak
measurement

IR= 0.5mA to
5mA
See note (c)

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