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| 2.5V LOW POWER 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 500A. The circuit features a knee current of 150A 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 F i g . 1. Thi s f a ci l i t y i s u sed w he n 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. ZRT025 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 IR RT=100k (Optional trim facility) Gnd Gnd This circuit will allow the reference to be trimmed over a wide range. The device is specified over a 5% trim range. 4-279 ZRT025 ABSOLUTE MAXIMUM RATING Reverse Current Operating Temperature A grade C grade Storage Temperature TO18 SO8, SOT223 75mA o -55C to 125C 0C to 70C -55 C to 175 C -55 C to 125 C Power Dissipation (Tamb=25C) TO18 300mW SO8 625mW SOT223 2W o Above 72C this figure should be linearly derated to 25mA at 125C TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER INITIAL GRADE A VOLTAGE -55C TO 125C TOLERANCE TYP MAX % 1&2 6.8 22.5 GRADE C 0C TO 70C TYP 2.7 MAX 8.8 mV UNITS VR Output voltage change over relevant temperature range (See note (a)) Output voltage temperature coefficient (See note (b)) TCVR 1&2 15.0 50.0 15.0 50.0 ppm/C ELECTRICAL CHARACTERISTICS ( at Tamb=25C and Trim pin o/c unless otherwise stated) SYMBOL VR PARAMETER Output voltage 1% tolerance (A1,C1) 2% tolerance (C2) Output voltage adjustment range MIN. TYP. MAX. UNITS 2.525 V 2.550 % ppm/C/% 75 10 0.3 50 0.85 2.0 mA s V RL=1k Peak to peak measurement IR= 0.5mA to 5mA See note (c) COMMENTS 2.475 2.500 2.450 2.500 5 2.5 0.15 IR=500A RT=100k VTRIM TC VTRIM Change in TCVR with output adjustment IR ton toff enp-p RS Operating current range Turn-on time Turn-off time Output voltage noise (over the range 0.1 to 10Hz) Slope resistance 4-280 ZRT025 TYPICAL CHARACTERISTICS NOTES (a) Output change with temperature The absolute maximum difference between the maximum output voltage and the minimum output voltage over the specified temperature range (c) Slope resistance (RS) The slope resistance is defined as : RS = changein VR specifiedcurrentrange I = 5 - 0.5 = 4.5mA (typically) (d) Line regulation The ratio of change in output voltage to the change in input voltage producing it. VR = Vmax - Vmin (b) Output temperature coefficient (TCVR) The ratio of the output change with temperature to the specified temperature range expressed in ppm/C RS x 100 %V VR x Rsource TcVR = VR x 106 ppm C VR x T T= Full temperature range 4-281 ZRT025 CONNECTION DIAGRAMS SOT223 Package Suffix - G TO18 Package Suffix - None Top View Pin 4 floating or connected to pin 2 Bottom View - Case is internally connected to pin 3 SO8 Package Suffix - N8 Top View ORDERING INFORMATION Part No ZRT025C2 ZRT025C1 ZRT025A1 ZRT025GC2 ZRT025GC1 ZRT025GA1 ZRT025N8C2 ZRT025N8C1 ZRT025N8A1 Tol% Operating Temp.(C) 2 1 1 2 1 1 2 1 1 0 to 70 0 to 70 -55 to 125 0 to 70 0 to 70 -55 to 125 0 to 70 0 to 70 -55 to 125 Package TO18 TO18 TO18 SOT223 SOT223 SOT223 SO8 SO8 SO8 Partmark ZRT025C2 ZRT025C1 ZRT025A1 ZRT025C2 ZRT025C1 ZRT025A1 ZRT025C2 ZRT025C1 ZRT025A1 4-282 |
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