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NTE1549 Datasheet Preview

NTE1549 Datasheet

Integrated Circuit Dot/Bar Display Driver

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NTE1549 pdf
NTE1549
Integrated Circuit
Dot/Bar Display Driver
Description:
The NTE1549 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs,
LCDs, or vacuum fluorescent displays, providing an electronic version of the popular VU meter. One
pin changes the display from a bar graph to a moving dot display. LED current drive is regulated and
programmable, eliminating the need for current limiting resistors. The whole display system can oper-
ate from a single supply as low 3V or as high as 25V.
This IC contains an adjustable voltage reference and an accurate ten–step voltage divider. The high
impedance input buffer accepts signals down to ground 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 compara-
tors referenced to the precision divider. Accuracy is typically better than 0.2dB.
Audio applications include average or peak level indicators, and power meters. Replacing conven-
tional meters with an LED bar graph results in a faster responding, more rugged display with high visi-
bility that retains the ease of interpretation of an analog display.
The NTE1549 is extremely easy to apply. A 12V full–scale meter requires only one resistor in addition
to the ten LEDs. One more resistor program in addition to the full–scale anywhere from 1.2V to 12V
independent of supply voltage. LED brightness is easily controlled with a single pot.
The NTE1549 is very versatile. The outputs can drive LCDs, vacuum fluorescents and incandescent
bulb as well as LEDs of any color. Multiple devices can be cascaded for a dot or bar mode display
for increased range and/or resolution.
Features:
D Fast responding electronic VU meter
D Drives LEDs, LCDs, or vacuum fluorescents
D Bar or dot display mode externally selectable by user
D Expandable to displays of 70dB
D Internal voltage reference from 1.2V to 12V
D Operates with a single supply of 3V to 25V
D Inputs operate down to ground
D Output current programmable from 1mA to 30mA
D Input withstands ±35V without damabe or false outputs
D Outputs are current regulated, open collectors
D Directly drives TTL or CMOS
D The internal 10–step divider is floating and can be referenced to a wide range of voltages.



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NTE1549 Datasheet Preview

NTE1549 Datasheet

Integrated Circuit Dot/Bar Display Driver

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NTE1549 pdf
Absolute Maximum Ratings:
Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
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 +150°C
Lead Temperature (Soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1. The maximum junction temperature of the NTE1549 is 100°C. Devices must be derated for
operation at elevated temperatures. Junction to ambient thermal resistance is 120°C/W.
Note 2. Pin 5 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 3)
Parameter
Comparators
Offset Voltage, Buffer and First Comparator
Offset Voltage, Buffer and Any Other Comparator
Gain (ILED/VIN)
Input Bias Current (At Pin5)
Input Signal Overvoltage
Voltage Divider
Divider Resistance
Relative Accuracy (Input Change Between Any Two
Threshold Points)
Absolute Accuracy
Voltage Reference
Output Voltage
Line Regulation
Load Regulation
Output Voltage Change with Temperature
Adjust Pin Current
Test Conditions
Min Typ Max Unit
0V VRLO = VRHI 12V, ILED = 1mA
0V VRLO = VRHI 12V, ILED = 1mA
I(REF) = 2mA, ILED = 10mA
0V VIN (V+ =1.5V)
No Change in Display
3 10 mV
3 15 mV
3 8 mA/mV
25 100
nA
35 +35 V
Total Pin6 to Pin4
1dB VIN 3dB, Note 4
7dB VIN 1dB, Note 4
10dB VIN 7dB, Note 4
VIN = 2, 1, 0, 1dB
VIN = 3, 5dB
VIN = 7, 10, 20dB
8 12 17
0.75 1.0 1.25
1.5 2.0 2.5
2.5 3.0 2.5
0.25 +0.25
0.5 +0.5
1 +1
k
dB
dB
dB
dB
dB
dB
0.1mA IL(REF) 4mA, V+ = VLED = 5V
3V V+ 18V
0.1mA IL(REF) 4mA, V+ = VLED = 5V
0° ≤ TA +70°C, IL(REF) = 1mA, V+ = VLED = 5V
1.2
1.28 1.34
0.01 0.03
0.4 2.0
1
75 120
V
%/V
%
%
mA
Note 3. Unless otherwise stated, all specifications apply with the following conditions:
3VDC V+ 20VDC; 0.015V VRLO 12VDC; TA = +25°C, IL(REF) = 0.2mA, Pin9 con-
nected to Pin3 bar mode.
3VDC VLED V+; VREF, VRHI, VRLO (V+ 1.5V); For higher power dissipations, pulse
testing is used.
0.015V VRHI 12VDC; 0V VIN V+ 1.5V
Note 4. Accuracy is measured referred to +3dB = +3dB = +10.000VDC at Pin5, with +10.000VDC at
Pin6, and 0.000 VDC at Pin4. At lower fullscale voltages, buffer and comparator offset volt-
age may add significant error.


Part Number NTE1549
Description Integrated Circuit Dot/Bar Display Driver
Maker NTE
Total Page 4 Pages
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