ICL8038 Versatile Waveform Generator

ICL8038 Device Information

The ICL8038 waveform generator is a monolithic integrated circuit capable of producing high accuracy sine, square, triangular, sawtooth and pulse waveforms with a minimum of external components. The frequency (or repetition rate) can be selected externally from 0.001Hz to more than 300kHz using either resistors or capacitors, and frequency modulation and sweeping can be accomplished with an external voltage....

• Low Frequency Drift with Temperature 250ppm/^oC
• Low Distortion 1%(SineWave Output)
• High Linearity 0.1%(Triangle Wave Output)
• Wide Frequency Range 0.001Hz to 300kHz
• Variable Duty Cycle 2%to 98%
• High Level Outputs TTL to 28V
• Simultaneous Sine, Square, and Triangle Wave Outputs
• Easy to Use - Just a Handful of External Components Required

Everything You Always Wanted to Know About the ICL8038

• Function Generator using ICL8038
• Electronics -- ICL8038-based Oscillator
• DIY Function Generator
• PWM Signal Generators
• Signal Generators Circuits
• Electrical Communications Systems
• DDS Function Generator

(This is another chip of intersil i used for many things - delabs)

LM311 - Voltage Comparator

LM311 - Voltage Comparator

• Operates from single 5V supply
• Input current: 150 nA max. over temperature
• Offset current: 20 nA max. over temperature
• Differential input voltage range: ±30V
• Power consumption: 135 mW at ±15V

The LM111, LM211 and LM311 are voltage comparators that have input currents nearly a thousand times lower than devices like the LM106 or LM710. They are also designed to operate over a wider range of supply voltages: from standard ±15V op amp supplies down to the single 5V supply used for IC logic.

Related Resources -

• Application Note 260 A 20-Bit A/D Converter pdf
• Low Power Low Offset Quad Comparator LM339
• A/D Converter Interfaces Easily with Many Microprocessors
• Voltage Comparator Information And Circuits
• Comparators and Schmitt Triggers
• Craig's Thermostat Circuits

LF398 - Monolithic Sample and Hold Circuit

LF398 - Monolithic Sample and Hold Circuit

The LF198/LF298/LF398 PDF are monolithic sample-and-hold circuits which utilize BI-FET technology to obtain ultra-high dc accuracy with fast acquisition of signal and low droop rate. Operating as a unity gain follower, dc gain accuracy is 0.002% typical and acquisition time is as low as 6 µs to 0.01%. A bipolar input stage is used to achieve low offset voltage and wide bandwidth. Input offset adjust is accomplished with a single pin, and does not degrade input offset drift. The wide bandwidth allows the LF198 to be included inside the feedback loop of 1 MHz op amps without having stability problems. Input impedance of 10¹⁰Ohm allows high source impedances to be used without degrading accuracy.

P-channel junction FET's are combined with bipolar devices in the output amplifier to give droop rates as low as 5 mV/min with a 1 µF hold capacitor. The JFET's have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design guarantees no feed-through from input to output in the hold mode, even for input signals equal to the supply voltages.

Related Circuits and Projects

• Sample and Hold
• Lockbox Synth
• Datasheets Hans Summers
• Other Op-Amp Ideas
• Synth-in-a-box

LM3914 - Dot Bar Display Driver

LM3914 - Dot/Bar Display Driver

• Drives LEDs, LCDs or vacuum fluorescents
• Bar or dot display mode externally selectable by user
• Expandable to displays of 100 steps
• Internal voltage reference from 1.2V to 12V
• Operates with single supply of less than 3V
• Inputs operate down to ground
• Input withstands ±35V without damage or false outputs
• LED driver outputs are current regulated, open-collectors
• Outputs can interface with TTL or CMOS logic

The LM3914 is a monolithic integrated circuit that senses analog voltage levels and drives 10 LEDs, providing a linear analog display. A single pin changes the display from a moving dot to a bar graph. Current drive to the LEDs is regulated and programmable, eliminating the need for resistors. This feature is one that allows operation of the whole system from less than 3V.

The circuit contains its own adjustable reference and accurate 10-step voltage divider. The low-bias-current input buffer accepts signals down to ground, or V^-, yet needs no protection against inputs of 35V above or below ground. The buffer drives 10 individual comparators referenced to the precision divider. Indication non-linearity can thus be held typically to ½%, even over a wide temperature range.

Circuits and Projects of LM3914

• Simple but reliable car battery tester
• LM2941 Manual Fan Regulator & LM3914 Voltage Monitor
• Novel white LED torch
• The analog / digital / analog (ada) dial
• Do-it-yourself analog-to-LM3914 display driver ...
• Indikátor napětí autobaterie s LM3914
• Bauplan Schaltplan Bargraph Anzeige mit dem LM3914
• LED Anzeigeinstrument mit LM3914
• Beverage switch
• Stereo Digital Camera Sync Shepherd
• Automatic Depth Control Computer
• DIS*PLAYER: Theory and Construction

ICL7135 Device Information

ICL7135 Device Information

The Intersil ICL7135 precision A/D converter, with its multiplexed BCD output and digit drivers, combines dual-slope conversion reliability with ±1 in 20,000 count accuracy and is ideally suited for the visual display DVM/DPM market. The 2.0000V full scale capability, auto-zero, and auto-polarity are combined with true ratiometric operation, almost ideal differential linearity and true differential input. All necessary active devices are contained on a single CMOS lC, with the exception of display drivers, reference, and a clock.

• Accuracy Guaranteed to ±1 Count Over Entire ±20000 Counts (2.0000V Full Scale)
• Guaranteed Zero Reading for 0V Input
• 1pA Typical Input Leakage Current
• True Differential Input
• True Polarity at Zero Count for Precise Null Detection
• Single Reference Voltage Required
• Overrange and Underrange Signals Available for Auto-Range Capability
• All Outputs TTL Compatible
• Blinking Outputs Gives Visual Indication of Overrange
• Six Auxiliary Inputs/Outputs are Available for Interfacing to UARTs, Microprocessors, or Other Circuitry
• Multiplexed BCD Outputs
  

ICL7107-DPM-DVM-Intersil

ICL7107 Device Information

The Intersil ICL7106 and ICL7107 are high performance, low power, 3¹/₂ digit A/D converters. Included are seven segment decoders, display drivers, a reference, and a clock. The ICL7106 is designed to interface with a liquid crystal display (LCD) and includes a multiplexed backplane drive; the ICL7107 will directly drive an instrument size light emitting diode (LED) display.

• Guaranteed Zero Reading for 0V Input on All Scales
• True Polarity at Zero for Precise Null Detection
• 1pA Typical Input Current
• True Differential Input and Reference, Direct Display Drive
• LCD ICL7106, LED lCL7107
• Low Power Dissipation - Typically Less Than 10mW

Ananth -
This is one of the first mixed CMOS IC, I used it after studying Intersil CMOS Hot Ideas Book. It is also the most widely used Display chip in India. Many Millions of Instruments are built using this chip both in Instrumentation and Industrial Automation. The ICL7106 was most popular in Hand Held DMM's and Clamp Meters as it used to drive a LCD Display. ICL7109 was to interface with Digital Comparators and Microprocessors.

• ICL7106 Device Information Battery Operation LCD display.
• ICL7109 12-Bit A/D Converter with 3-State Binary Outputs

Quad-Differential-Comparator-LM339-TI

Quad, General Purpose Differential Comparator - LM339 - TI Product Folder

These devices consist of four independent voltage comparators that are designed to operate from a single power supply over a wide range of voltages. Operation from dual supplies also is possible, as long as the difference between the two supplies is 2 V to 36 V, and V_CC is at least 1.5 V more positive than the input common-mode voltage. Current drain is independent of the supply voltage. The outputs can be connected to other open-collector outputs to achieve wired-AND relationships.

• Single Supply or Dual Supplies
• Wide Range of Supply Voltage:
• Low Supply-Current Drain Independent of Supply Voltage... 0.8 mA Typ
• Low Input Bias Current ...25 nA Typ
• Low Input Offset Voltage . . . 2 mV Typ
• Common-Mode Input Voltage Range Includes Ground
• Differential Input Voltage Range Equal to Maximum-Rated Supply Voltage . . . ±36 V
• Low Output Saturation Voltage
• Output Compatible With TTL, MOS, and CMOS