Zetex ZRT025A1, ZRT025C1, ZRT025C2, ZRT025GA1, ZRT025GC1 Datasheet

2.5V LOW POWER	ZRT025
PRECISION REFERENCE SOURCE
ISSUE 1 - OCTOBER 1995

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.

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

SCHEMATIC DIAGRAM

R
VCC						VR
R=VCC-VR						RT=100k
IR
						(Optional trim facility)
Gnd
						Gnd

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

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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

SO8, SOT223 -55 °C to 125 °C

Power Dissipation (Tamb=25°C)

TO18	300mW
SO8	625mW
SOT223	2W

ø Above 72°C this figure should be linearly derated to 25mA at 125°C

TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS

SYMBOL	PARAMETER	INITIAL	GRADE A		GRADE C		UNITS
		VOLTAGE	-55°C TO 125°C		0°C TO 70°C
		TOLERANCE
			TYP	MAX	TYP	MAX
		%
DVR	Output voltage change	1 & 2	6.8	22.5	2.7	8.8	mV
	over relevant
	temperature range
	(See note (a))
TCVR	Output voltage	1 & 2	15.0	50.0	15.0	50.0	ppm/°C
	temperature coefficient
	(See note (b))

ELECTRICAL CHARACTERISTICS

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

SYMBOL	PARAMETER	MIN.	TYP.	MAX.	UNITS	COMMENTS
VR	Output voltage					IR=500μA
	1% tolerance (A1,C1)	2.475	2.500	2.525	V
	2% tolerance (C2)	2.450	2.500	2.550
DVTRIM	Output voltage adjustment		65		%	RT=100kΩ
	range
TCDVTRIM	Change in TCVR with output		2.5		ppm/°C/%
	adjustment
IR	Operating current range	0.15		75	mA
ton	Turn-on time		10		μs	RL=1kΩ
toff	Turn-off time		0.3
enp-p	Output voltage noise (over the		50		μV	Peak to peak
	range 0.1 to 10Hz)					measurement
RS	Slope resistance		0.85	2.0	Ω	IR= 0.5mA to
						5mA
						See note (c)

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