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| 4.0V LOW POWER PRECISION REFERENCE SOURCE ISSUE 2 - OCTOBER 1997 DEVICE DESCRIPTION The ZRT040 is a monolithic integrated circuit providing a precise stable reference voltage of 4.01V at 500A. The circuit features a knee current of 150A 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 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. ZRT040 FEATURES * * * * * * * * * 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 IR RT=100k (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 5% trim range. 4-283 ZRT040 ABSOLUTE MAXIMUM RATING Reverse Current Operating Temperature A grade B grade C grade Storage Temperature TO18 SO8, SOT223 75mA o -55C to 125C -40C to 85C 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 25C this figure should be linearly derated to 15mA at 125C TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER INITIAL GRADE A GRADE B GRADE C VOLTAGE TOL.% TYP MAX TYP MAX TYP MAX 1&2 11.0 36.0 7.5 24.0 4.2 14.0 UNIT VR Output voltage change over relevant temperature range (See note (a)) mV TCVR Output voltage 1&2 temperature coefficient (See note (b)) 15.0 50.0 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,B1) 2% tolerance (C2,B2) Output voltage adjustment range Change in TCVR with output adjustment Operating current range Turn-on time Turn-off time Output voltage noise (over the range 0.1 to 10Hz) Slope resistance 0.15 40 0.3 50 1.1 3.0 MIN. 3.97 3.93 TYP. MAX. UNITS 4.01 4.01 5 2.5 75 4.05 4.09 V % ppm/C/% mA s V RL=1k Peak to peak measurement IR= 0.5mA to 5mA See note (c) COMMENTS IR=500A RT=100k VTRIM TC VTRIM IR ton toff enp-p RS 4-284 ZRT040 TYPICAL CHARACTERISTICS NOTES (a) Output change with temperature. (VR) The absolute maximum difference between the maximum output voltage and the minimum output voltage over the specified temperature range (c) Operating current (IR) Maximum operating current must be derated as indicated in maximum ratings. (d) Slope resistance (RS) The slope resistance is defined as : 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 = changein VR specifiedcurrentrange I = 5 - 0.5 = 4.5mA (typically) (e) Line regulation The ratio of change in output voltage to the change in input voltage producing it. VR x 106 TcVR = ppm C VR x T T= Full temperature range RS x 100 %V VR x Rsource 4-285 ZRT040 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 ZRT040C2 ZRT040C1 ZRT040B2 ZRT040B1 ZRT040A1 ZRT040GC2 ZRT040GC1 ZRT040GB2 ZRT040GB1 ZRT040GA1 Tol% Gra- Package Partmark de 2 1 2 1 1 2 1 2 1 1 C C B B A C C B B A TO18 TO18 TO18 TO18 TO18 ZRT040C2 ZRT040C1 ZRT040B2 ZRT040B1 ZRT040A1 Part No Tol% Gra- Package Partmark de C C B B A SO8 SO8 SO8 SO8 SO8 ZRT040C2 ZRT040C1 ZRT040B2 ZRT040B1 ZRT040A1 ZRT040N8C2 2 ZRT040N8C1 1 ZRT040N8B2 2 ZRT040N8B1 1 ZRT040N8A1 1 A Grade B Grade C Grade SOT223 ZRT040C2 SOT223 ZRT040C1 SOT223 ZRT040B2 SOT223 ZRT040B1 SOT223 ZRT040A1 -55C to 125C -40C to 85C 0C to 70C 4-286 |
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