Zetex ZRA245N803, ZRA245R01, ZRA245R02, ZRA245R03, ZRA245Y01 Datasheet

PRECISION 2.45 VOLT	ZRA245
VOLTAGE REFERENCE
ISSUE 3 — MARCH 1998

DEVICE DESCRIPTION

The ZRA245 uses a bandgap circuit design to achieve a precision voltage reference of 2.45 volts. The device is available in small outline surface mount packages, ideal for applications where space saving is important.

The ZRA245 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA245 is recommended for operation between 2mA and 120mA.

FEATURES

∙Small outline SOT23, SO8 and TO92 style package

∙No stabilising capacitor required

∙Typical TC 15ppm/°C

∙Typical slope resistance 0.26Ω

∙± 3% , 2% and 1% tolerance

∙Industrial temperature range

∙Operating current 2mA to 120mA

APPLICATIONS

∙Battery powered and portable equipment.

∙Metering and measurement systems.

∙Instrumentation.

∙Test equipment.

∙Data acquisition systems.

∙Precision power supplies.

SCHEMATIC DIAGRAM

VR

1.25VREF

Gnd

4-227

ZRA245

ABSOLUTE MAXIMUM RATING

Power Dissipation (Tamb=25°C)

SOT23

330mW

Reverse Current

200mA

E-Line, 3 pin (TO92)

500mW

Forward Current

25mA

E-Line, 2 pin (TO92)

500mW

Operating Temperature

-40 to 85°C

SO8

625mW

Storage Temperature

-55 to 125°C

ELECTRICAL CHARACTERISTICS

TEST CONDITIONS (Unless otherwise stated) Tamb=25°C

SYMBOL

PARAMETER

CONDITIONS

LIMITS

TOL.

UNITS

%

MIN

TYP

MAX

VR

Reverse Breakdown Voltage

IR=5mA

2.43

2.45

2.47

1

V

2.40

2.45

2.50

2

2.38

2.45

2.52

3

IMIN

Minimum Operating Current

2

mA

IR

Recommended Operating

2

120

mA

Current

TC †

Average Reverse Breakdown

15

50

ppm/°C

Voltage Temp. Co.

IR(min) to

IR(max)

RS

§

Slope Resistance

0.26

0.5

Ω

ZR

Reverse Dynamic Impedance

IR = 5mA

0.28

1

Ω

f = 100Hz

IAC=0.1 IR

EN

Wideband Noise Voltage

IR = 5mA

65

μV(rms)

f = 10Hz to

10kHz

†

TC =

(VR(max)−VR(min))

x 1000000

VR x (T(max)−T(min))

Note: VR(max) - VR(min) is the maximum

deviation in reference voltage measured

over the full operating temperature

range.

§

RS =

VR Change(IR (min) to IR (max))

IR (max) − IR (min)

4-228