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PRECISION 1.25 VOLT MICROPOWER VOLTAGE REFERENCE
ISSUE 2 - FEBRUARY 1997 DEVICE DESCRIPTION
The ZRA124 uses a bandgap circuit design to achieve a precision micropower voltage reference of 1.24 volts. The device is available in small outline surface mount packages, ideal for applications where space saving is important, as well as packages for through hole requirements. The ZRA124 design provides a stable voltage without an external capacitor and is stable with capacitive loads. The ZRA124 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 a suggested 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.
ZRA124
* * * * * * * * * * * *
Typical TC 30ppm/C Typical slope resistance 0.65 1% tolerance Industrial temperature range Operating current 50A to 5mA Transient response, stable in less than 10s Battery powered and portable equipment. Metering and measurement systems. Instrumentation. Precision power supplies. Test equipment. Data acquisition systems
APPLICATIONS
FEATURES
* *
Small outline SOT23, SO8 and TO92 style packages No stabilising capacitor required
SCHEMATIC DIAGRAM
V
R
G nd
1 - 21
ZRA124
ABSOLUTE MAXIMUM RATING
Reverse Current Forward Current Operating Temperature Storage Temperature 25mA 25mA -40 to 85C -55 to 125C Power Dissipation (Tamb=25C) SOT23 330mW 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 Reverse Breakdown Voltage IR=150A Minimum Operating Current Recommended Operating Current Average Reverse Breakdown Voltage Temp. Co. Slope Resistance Reverse Dynamic Impedance IR = 1mA f = 100Hz IAC= 0.1 IR Wideband Noise Voltage IR = 150A f = 100Hz to 10kHZ
60
LIMITS TYP MAX 1.24 1.252 30 0.05 30 50 5 90
TOL. % 1 V A
UNITS
1.228
mA ppm/C
IR(min) to IR(max)
RS ZR
0.65 2 0.5 1

EN
40
V(rms)
Reverse Current (A)
TC =
VR Change x 1000000 VR x Temperature Change
50
40
30
VR Change (IR (min) to IR (max)) RS = IR (max) - IR (min)
20
T)
=8
C 5
)=
2 5
C 0 -4 C
10
T
T
)=
0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
Reverse Voltage (V)
Reverse Characteristics
1 - 22
ZRA124
TYPICAL CHARACTERISTICS
1.4 1.27 IR=150A to 5mA
Reference voltage (V)
Forward Voltage (V)
1.2
1.26
1.0
1.25
0.8
1.24
0.6
1.23
1.22
0.4
0.2 0.1 1 10 100 1000
1.21 -40 -20 0 20 40 60 80
Forward Current (mA)
Temperature (C)
Forward Characteristics
Temperature Drift
1000
1.0
Slope resistance ()
100
Slope resistance ()
TA=-40C
I4=150A
10
I4=1mA
0.5
TA=25C
TA=85C
1
I4=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 O UTPUT
1.0
INPUT 1 K8 O UTPUT
0.5
0.5
0
0
- (V)
VI
N
0
1
2
3
4
VI
0
- (V)
N
10
10
0
0
2
4
6
8
Time (s)
Time (s)
Transient Response (I4=150A)
Transient Response (I4=5mA)
1 - 23
ZRA124
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
E-Line, 3 pin Package Suffix A
SO8 Package Suffix N8
Bottom View Pin 1 floating or connected to pin 3
Top View
SOT23 Package Suffix F
ORDERING INFORMATION
Part No ZRA124A01 Tol% Package 1 1 1 1 1 E-Line * SOT23 SO8 E-Line * E-Line Partmark ZRA12401 12C ZRA12401 ZRA124R1 ZRA12401
Top View Pin 1 floating or connected to pin 2
ZRA124F01 ZRA124N801 ZRA124R01 ZRA124Y01
* E-Line 3 pin Reversed E-Line 2 pin * E-Line 3 pin

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