4.0V LOW POWER PRECISION REFERENCE SOURCE ZRT040 ISSUE 2 - OCTOBER 1997 DEVICE DESCRIPTION FEATURES The ZRT040 is a monolithic integrated circuit providing a precise stable reference voltage of 4.01V at 500µA. • • • • • The circuit features a knee current of 150µA 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. • • • SCHEMATIC DIAGRAM R VCC R=VCC-VR IR Gnd VR RT=100k (Optional trim facility) Gnd Figure 1: This circuit will allow the reference to be trimmed over a wide range. The device is specified over a 65% trim range. 4-283 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 ZRT040 ABSOLUTE MAXIMUM RATING Reverse Current Operating Temperature A grade B grade C grade Storage Temperature TO18 SO8, SOT223 Power Dissipation (Tamb=25°C) TO18 300mW SO8 625mW SOT223 2W ø Above 25°C this figure should be linearly derated to 15mA at 125°C 75mA ø -55°C to 125°C -40°C to 85°C 0°C to 70°C -55 °C to 175 °C -55 °C to 125 °C TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER INITIAL GRADE A GRADE B GRADE C VOLTAGE TOL.% TYP MAX TYP MAX TYP MAX UNIT DVR Output voltage change over relevant temperature range (See note (a)) 1&2 11.0 36.0 7.5 24.0 4.2 14.0 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=25°C and Trim pin o/c unless otherwise stated) SYMBOL PARAMETER VR Output voltage 1% tolerance (A1,C1,B1) 2% tolerance (C2,B2) MIN. 3.97 3.93 TYP. MAX. UNITS COMMENTS 4.01 4.01 V IR=500µA RT=100kΩ 4.05 4.09 DVTRIM Output voltage adjustment range 65 % TCDVTRIM Change in TCVR with output adjustment 2.5 ppm/°C/% IR Operating current range ton toff Turn-on time Turn-off time 40 0.3 µs RL=1kΩ enp-p Output voltage noise (over the range 0.1 to 10Hz) 50 µV Peak to peak measurement RS Slope resistance 1.1 Ω IR= 0.5mA to 5mA See note (c) 0.15 4-284 75 3.0 mA ZRT040 TYPICAL CHARACTERISTICS NOTES (c) Operating current (IR) (a) Output change with temperature. (VR) Maximum operating current must be derated as indicated in maximum ratings. The absolute maximum difference between the maximum output voltage and the minimum output voltage over the specified temperature range (d) Slope resistance (RS) The slope resistance is defined as : DVR = Vmax - Vmin RS = (b) Output temperature coefficient (TCVR) changein VR specifiedcurrentrange ∆I = 5 - 0.5 = 4.5mA (typically) The ratio of the output change with temperature to the specified temperature range expressed in ppm/°C (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 RS x 100 %⁄V VR x Rsource ∆T= Full temperature range 4-285 ZRT040 CONNECTION DIAGRAMS SOT223 Package Suffix – G TO18 Top View Pin 4 floating or connected to pin 2 Package Suffix – None Bottom View – Case is internally connected to pin 3 SO8 Package Suffix – N8 Top View ORDERING INFORMATION Part No Tol% Gra- Package Partmark de Part No ZRT040C2 2 C TO18 ZRT040C2 ZRT040N8C2 2 C SO8 ZRT040C2 ZRT040C1 1 C TO18 ZRT040C1 ZRT040N8C1 1 C SO8 ZRT040C1 ZRT040B2 2 B TO18 ZRT040B2 ZRT040N8B2 2 B SO8 ZRT040B2 ZRT040B1 1 B TO18 ZRT040B1 ZRT040N8B1 1 B SO8 ZRT040B1 ZRT040A1 1 A TO18 ZRT040A1 ZRT040N8A1 1 A SO8 ZRT040A1 ZRT040GC2 2 C SOT223 ZRT040C2 ZRT040GC1 1 C SOT223 ZRT040C1 ZRT040GB2 2 B SOT223 ZRT040B2 ZRT040GB1 1 B SOT223 ZRT040B1 ZRT040GA1 1 A SOT223 ZRT040A1 A Grade B Grade C Grade 4-286 Tol% Gra- Package Partmark de -55°C to 125°C -40°C to 85°C 0°C to 70°C