NTE1510 Integrated Circuit 5–Step LED Driver for Linear Scale Description: The NTE1510 is an integrated circuit in an 8–Lead SIP type package designed for use in level meter applications. This device is capable of driving 5 LEDs to create a bar–type display. In accordance with the input level, the uppermost LED brightness varies to form a linear indicator, making the NTE1510 ideal for use in signal meters and VU meters. A low–voltage reference power supply is built–in, so that the only external components required are LEDs, resistors, and capacitors. Features: D Bar–Type Display of Input Level using 5 LEDs D The Uppermost LED Brightness Varies Linearly With Respect to the Input Level Resulting in a High–Resolution Display with No Radiation. D Built–In Reference Supply D By Changing the External Reference Values, the LED Brightness can be Adjusted D Wide Range of Supply Voltages: VCC = 4V to 18V D High Input Impedance: IIN = 100nA Typ Applications: D Signal Meters D VU Meters D Tuning Meters D General Purpose Display Applications Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6V Output Breakdown Voltage, BVO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Output Current (Per Pin), IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15mA Power Dissipation (Note 1), PdF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 550mW Derate Above 25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5mW/°C Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C Note 1. With the NTE1510 soldered to a printed circuit board (copper–clad area 4.5cm x 5.5cm, thickness 35µ, board thickness 2.0mm). Recommended Operating Conditions: Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4V to 18V Rated Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10V Electrical Characteristics: (TA= +25°C, VCC = 10V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Supply Voltage Range VCC 4 10 18 V Fullscale Input Voltage VINF – 1320 – mV Step Voltage Vstep – 210 – mV Input Current IIN VIN = 0V, Note 2 – 0.1 1.0 µA Circuit Current ICC VIN = 0V – 5 8 mA 170 230 300 mV 380 450 530 mV Output 1 LED Drive Voltage (Pin6) VIT(6) Output 2 LED Drive Voltage (Pin7) VIT(7) Output 3 LED Drive Voltage (Pin8) VIT(8) 580 660 730 mV Output 4 LED Drive Voltage (Pin1) VIT(1) 780 860 940 mV Output 5 LED Drive Voltage (Pin2) VIT(2) 980 1070 1180 mV RL = 1.5kΩ, IL = 100µA, Using red GaAIAs LEDs Note 2. Current flowing from Pin4 is taken as positive current. Pin Connection Diagram (Front View) 8 LED3 7 LED2 6 LED1 5 VCC 4 Input 3 GND 2 LED5 1 LED4 .768 (19.52) Max .118 (3.0) Max .264 (6.72) Max 1 8 .165 (4.2) Min .100 (2.54) Typ .700 (17.78)