Zetex ZRT040GB1, ZRT040GB2, ZRT040GC1, ZRT040GC2, ZRT040N8A1 Datasheet

4.0V LOW POWER		ZRT040
PRECISION REFERENCE SOURCE
ISSUE 2 - OCTOBER 1997
DEVICE DESCRIPTION	FEATURES

The ZRT040 is a monolithic integrated circuit providing a precise stable reference voltage of 4.01V at 500μA.

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

The ZRT040 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.

∙Trimmable output

∙Excellent temperature stability

∙Low output noise figure

∙Available in three temperature ranges

∙1 and 2% initial voltage tolerance versions available

∙No external stabilising capacitor required in most cases

∙Low slope resistance

∙TO18 package

∙SOT223 and SO8 small outline packages

SCHEMATIC DIAGRAM

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

Figure 1:

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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ZRT040

ABSOLUTE MAXIMUM RATING

Reverse Current	75mA ø
Operating Temperature
A grade	-55°C to 125°C
B grade	-40°C to 85°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 25°C this figure should be linearly derated to 15mA at 125°C

TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS

SYMBOL	PARAMETER	INITIAL	GRADE A		GRADE B		GRADE C		UNIT
		VOLTAGE
		TOL.%	TYP	MAX	TYP	MAX	TYP	MAX
DVR	Output voltage	1 & 2	11.0	36.0	7.5	24.0	4.2	14.0	mV
	change over relevant
	temperature range
	(See note (a))
TCVR	Output voltage	1 & 2	15.0	50.0	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,B1)	3.97	4.01	4.05	V
	2% tolerance (C2,B2)	3.93	4.01	4.09
DVTRIM	Output voltage adjustment		65		%	RT=100kΩ
	range
TCDVTRIM	Change in TCVR with		2.5		ppm/°C/%
	output adjustment
IR	Operating current range	0.15		75	mA
ton	Turn-on time		40		μs	RL=1kΩ
toff	Turn-off time		0.3
enp-p	Output voltage noise (over		50		μV	Peak to peak
	the range 0.1 to 10Hz)					measurement
RS	Slope resistance		1.1	3.0	Ω	IR=
						0.5mA to 5mA
						See note (c)

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