9.8V LOW POWER PRECISION REFERENCE SOURCE ZRT100 ISSUE 1 - OCTOBER 1995 DEVICE DESCRIPTION FEATURES The ZRT100 is a monolithic integrated circuit providing a precise stable reference voltage of 9.8V at 500µA. • • • • • The circuit features a knee current of 150µA and operation over a wide range of temperatures and currents. • The ZRT100 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. 4-295 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 TO18 package SOT223 and SO8 small outline packages ZRT100 ABSOLUTE MAXIMUM RATING Reverse Current Operating Temperature A 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 6mA at 125°C 30mA ø -55°C to 125°C 0°C to 70°C -55 °C to 175 °C -55 °C to 125 °C TEMPERATURE DEPENDENT ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER INITIAL VOLTAGE TOLERANCE % GRADE A -55°C TO 125°C GRADE C 0°C TO 70°C TYP MAX TYP MAX UNITS DVR Output voltage 1&2 change over relevant temperature range (See note (a)) 27.0 90.0 10.8 34.4 mV TCVR Output voltage temperature coefficient (See note (b)) 15.0 50.0 15.0 50.0 ppm/°C 1&2 ELECTRICAL CHARACTERISTICS ( at Tamb =25°C and Trim pin o/c unless otherwise stated) SYMBOL PARAMETER VR DVTRIM Output voltage 1% tolerance (A1,C1) 2% tolerance (C2) MIN. 9.70 9.60 Output voltage adjustment range TCDVTRIM Change in TCVR with output adjustment IR Operating current range ton toff Turn-on time Turn-off time enp-p RS TYP. MAX. UNITS 9.80 9.80 9.90 V 10.00 65 % 5.0 ppm/°C/% 0.15 IR=500µA RT=100kΩ mA See note (c) 400 0.3 µs RL=1kΩ Output voltage noise (over the range 0.1 to 10Hz) 50 µV Peak to peak measurement Slope resistance 1.8 Ω IR = 0.5mA to 5mA See note (d) 4-296 30 COMMENTS 4.0 ZRT100 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 4-297 ZRT100 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% Operating Temp.(°C) Package Partmark ZRT100C2 2 0 to 70 TO18 ZRT100C2 ZRT100C1 1 0 to 70 TO18 ZRT100C1 ZRT100A1 1 -55 to 125 TO18 ZRT100A1 ZRT100GC2 2 0 to 70 SOT223 ZRT100C2 ZRT100GC1 1 0 to 70 SOT223 ZRT100C1 ZRT100GA1 1 -55 to 125 SOT223 ZRT100A1 ZRT100N8C2 2 0 to 70 SO8 ZRT100C2 ZRT100N8C1 1 0 to 70 SO8 ZRT100C1 ZRT100N8A1 1 -55 to 125 SO8 ZRT100A1 4-298