NTE1500 & NTE1501 Integrated Circuit 7–Step LED Driver Circuit Description: The NTE1500 and NTE1501 are integrated circuits designed for driving 7–dot LED displays. The NTE1500 responds logarithmically to the input signal while the NTE1501 responds linearly. Because an adjustment pin for output current is provided, the brightness of the LED can be controlled. Features: D Linear (NTE1501) and Logarithmic (NTE1500) Response D 7–LED Bar Graph Display Driver D Brightness is Externally Adjustable D High Output Current: 25mA Max D Series Connection Capable for Driving more than 7–Dot Displays Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18V Circuit Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5V Input Voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Output Voltage, VO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Supply Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA Output Current, IO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1800mW Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55° to +150°C Electrical Characteristics: (TA = +25°C, VCC = 9V unless otherwise specified) Parameter Supply Current Output Inflow Current Reference Voltage Output Offset Voltage (Amp) Voltage Gain (Amp) Output Pin Leakage Current Symbol Itot Test Conditions V2 = 0 I(SINK)9–15 VI = 3.55V, V7 = 3.5V VREF VO(offset) VCC = 16V, GV = 20dB, V2 = 0 Min Typ Max Unit 4 – 18 mA 13 – 25 mA 3.55 3.75 3.95 V –150 – +150 mV GV V2 = 50mV 18 20 22 dB IO(Leak) VCC = 18V 0 – 20 µA Electrical Characteristics (Cont’d): (TA = +25°C, VCC = 9V unless otherwise specified) Parameter Symbol Input Bias Current (Amp) Input Bias Current (Comparator) Comparator Level (NTE1500) Comparator Level (NTE1501) Test Conditions Min Typ Max Unit IBias2 VCC = 18V, V2 = 0 –2 – 0 µA IBias3 VCC = 18V, V3 = 0 –2 – 0 µA IBias7 VCC = 18V, V2 = 10V, V3 = 0, V7 = 0 –10 – 0 µA IBias1 VCC = 18V, V3 = 10V, VI = 0, V2 = 0, V6 = V7 –10 – 0 µA GD1 * V7 = 3.5, V8 = 0 –17 –15 –13 dB GD2 –9 –7 –5 dB GD3 –4 –3 –2 dB GD4 –1 0 1 dB GD5 1.5 2.0 2.5 dB GD6 3.5 4.0 4.5 dB GD7 4.5 5.0 5.5 dB 0.4 0.5 0.6 dB GD2 0.85 1.0 1.15 dB GD3 1.35 1.5 1.65 dB GD4 1.85 2.0 2.15 dB GD5 2.35 2.5 2.65 dB GD6 2.85 3.0 3.15 dB GD7 3.35 3.5 3.65 dB GD1 V7 = 3.65, V8 = 0 * The comparator reference voltage is 3.5V and 2.0V is 0dB (VCCopr = 5V to 16V). Pin Connection Diagram Output 1 16 VCC Input (–) 2 15 LED7 Input (+) 3 14 LED6 LED Current Input 4 13 LED5 LED Current Input 5 12 LED4 6 11 LED3 R2 7 10 LED2 R1 8 9 LED1 Vref GND 17 1.102 (28.0) Max 17 8 1 .256 (6.5) 9 16 .866 (22.0) Max .300 (7.62) .200 (5.08) .200 (5.08) .100 (2.54) .122 (3.0)