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NTE1509 Integrated Circuit 10-Step Dot/Bar Display Driver for Logarithmic Scale
Description: The NTE1509 is a monolithic integrated circuit in an 18-Lead DIP type package that senses analog voltage levels and drives 10 LEDs, LCDs, or vacuum fluorescent displays, providing a logarithmic 3dB analog display. A single pin changes the display from a bar graph to a moving dot display. LED current is regulated and programmable, eliminating the need for current limiting resistors. The whole display system can operate from a single supply as low as 3V or as high as 25V The circuit contains its own adjustable reference and accurate 10-step voltage divider. The high impedance input buffer accepts signals down to GND and up to within 1.5V of the positive supply. Further, it needs no protection against inputs of 35V. The input buffer drives 10 individual comparators referenced to the precision divider. Accuracy is typically better than 1dB. The NTE1509's 3dB/step display is suited for signals with wide dynamic range, such as audio level, power, light intensity, or vibration. Audio applications include average or peak level indicators, power meters, and RF signal strength meters. Replacing conventional meters with an LED bar graph results in a faster responding, more rugged display with high visibility that retains the ease of interpretation of an analog display. The NTE1509 is extremely easy to apply. A 1.2V full-scale meter requires only 1 resistor in addition to the 10 display LEDs. One more resistor programs the full-scale anywhere from 1.2V to 12V independent of supply voltage. LED brightness is easily controlled with a single pot. The NTE1509 is very versitile. The outputs can drive LCDs, vacuum fluorescents, and incandescent bulbs as well as LEDs of any color. Multiple devices can be cascaded for a dot or bar mode display with a range of 60 or 90dB. NTE1509s can also be cascaded with NTE1508s for a linear/log display or with NTE1549s for an extended-range VU meter. Features: D 3dB/Step, 30dB Range D D Drives LEDs, LCDs or vacuum fluorescents D D Bar or dot display mode externally selectable by user D D Expandable to displays of 90dB D Internal voltage reference from 1.2V to 12V D D Operates with single supply of 3V to 25V D D Inputs operate down to GND Output current programmable from 1 to 30mA Input withstands 35V without damage or false outputs Outputs are current regulated, open-collectors Directly Drives TTL or CMOS The internal 10-step divider is floating and can be referenced to a wide range of voltages
Absolute Maximum Ratings: Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1365mW Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V Voltage on Output Drivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25V Input Signal Overvoltage (Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35V Divider Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -100mV to V+ Reference Load Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +150C Lead Temperature (During soldering, 10sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +260C Note 1. The maximum junction temperature of the NTE1509 is +100C. Device must be derated for operation at elevated temperatures. Junction to ambient thermal resistance is 55C/W. Note 2. Pin5 input current must be limited to 3mA. The addition of a 39k resistor in series with Pin5 allows 100V signals without damage. Electrical Characteristics: (Note 2, unless otherwise specified, all specifications apply with the following conditions: 3VDC V+ 20VDC VREF, VRHI, VRLO (V+ -1.5V) 3VDC VLED V+ 0V VIN V+ -1.5V -0.015V VRLO 12VDC TA +25C, IL(REF) = 0.2mA, -0.015V VRHI 12VDC Pin9 connected to Pin3 (Bar Mode)
Test Conditions 0V VRLO = VRHI 12V, ILED = 1mA 0V VRLO = VRHI 12V, ILED = 1mA IL(REF) = 2mA, ILED = 10mA 0V VIN V+ =1.5V No Change is Display Min Typ Max Unit
Parameter Comparator Offset Voltage, Buffer, and First Comparator Offset Voltage, Buffer, and Any Other Comparator Gain (ILED/VIN) Input Bias Current (At Pin5) Input Signal Overdrive Voltage Divider Divider Resistance Relative Accuracy (Input Change Between Any Two Threshold Points) Absolute Accuracy at Each Threshold Point
- - 3 - -35
3 3 8 25 -
10 15 - 100 +35
mV mV mA/mV nA V
Total, Pin6 to Pin4 Note 3 VIN = -3, -6dB, Note 3 VIN = -9dB, Note 3 VIN = -12, -15, -18dB, Note 3 VIN = -21, -24, -27dB, Note 3
16 2.0 -0.5 -0.5 -0.5 -0.5
28 3.0 - - - -
36 4.0 +0.5 +0.65 +1.0 +1.5
k dB dB dB dB dB
Voltage Reference Output Voltage Line Regulation Load Regulation Output Voltage Change with Temperature Adjust Pin Current 0.1mA IL(REF) 4mA, V+ = VLED = 5V 3V V+ 18V 0.1mA IL(REF) 4mA, V+ = VLED = 5V 0 TA +70C, IL(REF) = 1mA, V+ = 5V 1.2 - - - - 1.28 0.01 0.4 1 75 1.34 0.03 2.0 - 120 V %/V % % A
Note 2. Pin5 input current must be limited to 3mA. The addition of a 39k resistor in series with Pin5 allows 100V signals without damage. Note 3. Accuracy is measured referred to +10.000VDC at Pin5, with + 10.000VDC at Pin6, and 0.000VDC at Pin4. At lower full-scale voltages, buffer and comparator offset voltage may add significant error. See table for threshold voltages.
Electrical Characteristics (Cont'd): (Note 2, unless otherwise specified, all specifications apply with the following conditions: 3VDC V+ 20VDC VREF, VRHI, VRLO (V+ -1.5V) 3VDC VLED V+ 0V VIN V+ -1.5V -0.015V VRLO 12VDC TA +25C, IL(REF) = 0.2mA, -0.015V VRHI 12VDC VLED = 3V, Pin9 connected to Pin3 (Bar Mode)
Parameter Output Drivers LED Current LED Current Difference (Between Largest and Smallest LED Currents) LED Current Regulation Dropout Voltage Saturation Voltage Output Leakage, Each Collector Output Leakage V+ = VLED = 5V, IL(REF) = 1mA VLED = 5V 2V VLED 17V ILED = 2mA ILED = 20mA ILED = 2mA ILED = 20mA ILED(ON) = 20mA, VLED = 5V, ILED = 2mA ILED = 2mA, IL(REF) = 0.4mA Bar Mode, Note 4 Dot Mode, Note 4 Pin10 to Pin18 Pin1 Supply Current Standby Supply Current (All Outputs OFF) V+ = 5V, IL(REF) = 0.2mA V+ = 20V, IL(REF) = 1mA - - 2.4 6.1 4.2 9.2 A A 7 - - - - - - - - 60 10 0.12 1.2 0.1 1 - 0.15 0.1 0.1 150 13 0.4 3.0 0.25 3 1.5 0.4 10 10 450 mA mA mA mA mA V V A A A Test Conditions Min Typ Max Unit
Note 2. Pin5 input current must be limited to 3mA. The addition of a 39k resistor in series with Pin5 allows 100V signals without damage. Note 4. Bar mode results when Pin9 is within 20mV of V+. Dot mode results when Pin9 is pulled at least 200mV below V+ or left open circuit. LED No. 10 (Pin10 output current) is disabled if Pin9 is pulled 0.9V or more below VLED. Threshold Voltage: (Note 3)
Output 1 1 3 4 5 dB -27 -24 -21 -18 -15 Min 0.422 0.596 0.841 1.189 1.679 Typ 0.447 0.631 0.891 1.259 1.778 Max 0.531 0.750 1.059 1.413 1.995 Output 6 7 8 9 10 dB -12 -9 -6 -3 0 Min 2.372 3.350 4.732 6.683 9.985 Typ 2.512 3.548 5.012 7.079 10.000 Max 2.819 3.825 5.309 7.498 10.015
Note 3. Accuracy is measured referred to +10.000VDC at Pin5, with + 10.000VDC at Pin6, and 0.000VDC at Pin4. At lower full-scale voltages, buffer and comparator offset voltage may add significant error. See table for threshold voltages.
Pin Connection Diagram
LED1 1 V (-) 2 V (+) 3 Divider Low 4 Signal Input 5 Divider High 6 Reference Output 7 Reference Adjust 8 Mode 9
18 LED2 17 LED3 16 LED4 15 LED5 14 LED6 13 LED7 12 LED8 11 LED9 10 LED10
18
10
1
9
.870 (22.1) Max .150 (3.8)
.250 (6.35)
.100 (2.54) .800 (20.3)
.125 (3.17) Min

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