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PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE
ISSUE 2 - MARCH 1998 DEVICE DESCRIPTION
The ZREF12 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.24 volts. The device is available in a small outline surface mount package, ideal for applications where space saving is important, as well as packages for through hole requirements. The ZREF12 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZREF12 is recommended for operation between 50A and 5mA and so is ideally suited to low power and battery powered applications. Excellent performance is maintained to an absolute maximum of 25mA, however the rugged design and 20 volt processing allows the reference to withstand transient effects and currents up to 200mA. Superior switching capability allows the device to reach stable operating conditions in only a few microseconds.
ZREF12
FEATURES
* * * * * * * * * * * * * * *
Small outline SO8 and TO92 style packages No stabilising capacitor required Typical TC 30ppm/C Typical slope resistance 0.65 1% tolerance Industrial temperature range (Military temperature range available on request) Operating current 50A to 5mA Transient response, stable in less than 10s Alternative package options and tolerances available Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Precision power supplies. Test equipment. Data acquisition systems
APPLICATIONS
SCHEMATIC DIAGRAM
V
R
G nd
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ZREF12
ABSOLUTE MAXIMUM RATING
Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) E-Line, 3 pin (TO92) 500mW E-Line, 2 pin (TO92) 500mW SO8 625mW
ELECTRICAL CHARACTERISTICS TEST CONDITIONS (Unless otherwise stated) Tamb=25C
SYMBOL PARAMETER CONDITIONS MIN VR IMIN IR TC RS ZR Reverse Breakdown Voltage Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. IR(min) to IR(max) Slope Resistance Reverse Dynamic Impedance Wideband Noise Voltage IR = 1mA f = 100Hz IAC= 0.1 IR IR = 150A f = 100Hz to 10kHz 0.05 30 IR=150A LIMITS TYP MAX TOL. % 1 V A mA ppm/C UNITS
1.228 1.24 1.252 30 50 5 90
0.65 2 0.5 1
EN
60 V(rms)
Reverse Current (A)
TC =
(VR(max)-VR(min)) x 1000000 VR x (T(max)-T(min))
60 50 40 30 20 10 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
C 5 C =8 5 TA =2 C TA 40 =TA
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)
Reverse Voltage (V)
Reverse Characteristics
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ZREF12
TYPICAL CHARACTERISTICS
1.4 1.27
Reference voltage (V)
Forward Voltage (V)
1.2 1.0 0.8 0.6 0.4 0.2 0.1 1 10 100 1000
1.26 1.25 1.24 1.23 1.22 1.21 -40 -20 0
IR=150A to 5mA
20
40
60
80
Forward Current (mA)
Temperature (C)
Forward Characteristics
Temperature Drift
1000
1.0
Slope resistance ()
100
Slope resistance ()
TA=-40C 0.5 TA=25C TA=85C
IR=150A
10
IR=1mA
1
IR=5mA
0.1 0 0.1 1 10 0.01 0.1 1 10 100
Reference Current (mA)
Frequency (kHz)
Slope Resistance v Current
Slope Resistance v Frequency
1.5
1.5
VR - (V)
1.0
VR - (V)
INPUT 58K OUTPUT
1.0
INPUT 1K8 OUTPUT
0.5
0.5
0
0
VIN - (V)
0 0 1 2 3 4
VIN - (V)
10
10 0 0 2 4 6 8
Time (s)
Time (s)
Transient Response (IR=150A)
Transient Response (IR=5mA)
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ZREF12
CONNECTION DIAGRAMS
E-Line, 2 pin Package Suffix - Y E-Line, 3 pin,Rev Package Suffix - R
Bottom View
Bottom View - Pin 3 floating or connected to pin 1
SO8 Package Suffix - N8
Top View
ORDERING INFORMATION
Part No ZREF12 ZREF12Z ZREF12D Tol% 1 1 1 Package E-Line E-Line * SO8 Partmark ZREF12 ZREF12 ZREF12
* E-Line 3 pin Reversed E-Line 2 pin
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