Saturday, October 14, 2017

Wide-Bandwidth Dual JFET Opamp LF353

These devices are low cost, high speed, dual JFET input operational amplifiers with an internally trimmed input offset voltage.

They require low supply current yet maintain a large gain bandwidth product and fast slew rate. In addition, well matched high voltage JFET input devices provide very low input bias and offset currents.

Wide-Bandwidth Dual JFET Opamp LF353

LF353 - Wide Bandwidth Dual JFET Input Operational Amplifier

Some Highlights
  • Gain Bandwidth 4 MHz
  • Slew Rate 13 Volts/usec
  • Offset Voltage 10 mV
  • Low Input Bias Current: 50pA
  • High Input Impedance: 1 Tera Ohms

Dual Low-Noise JFET Opamp TL072-TI

The JFET-input operational amplifiers in the TL07x series are designed as low-noise versions of the TL08x series amplifiers with low input bias and offset currents and fast slew rate.

Quadrature Oscillator - 100 kHz - TL072-TI - TL072-TI  Opamp

Dual-Low-Noise-JFET-Opamp-TL072-TI

The low harmonic distortion and low noise make the TL07x series ideally suited for high-fidelity and audio preamplifier applications. Each amplifier features JFET inputs (for high input impedance) coupled with bipolar output stages integrated on a single monolithic chip.

Dual-Low-Noise-JFET-Opamp-TL072-TI
  • Low Power Consumption
  • Low Input Bias and Offset Currents
  • Low Noise
  • High Input Impedance JFET Input Stage
  • High Slew Rate - 13 V/┬Ás Typ
  • Common-Mode Input Voltage Range Includes VCC+

Friday, October 13, 2017

CA3140 and CA3130 Special Opamps

CA3140 and CA3130 are originally RCA part numbers( i feel). They are amazing close to ideal opamps, the input offset has to be trimmed. I used to use it when high input impedance is required. 1.5T ohm 10pA is the specs. A Electrometer can be made with just one opamp.

CA3130 has the additional Merit of swinging to the rails, if you are on a +/- 12V supply, the output will be +/-12V. This is a feature required in control applications.

These devices are now available with Intersil.

CA3140 -4.5MHz, BiMOS Operational Amplifier with MOSFET Input/Bipolar Output

The CA3140A and CA3140 BiMOS operational amplifiers feature gate protected MOSFET (PMOS) transistors in the input circuit to provide very high input impedance, very low input current, and high speed performance. The CA3140A and CA3140 operate at supply voltage from 4V to 36V (either single or dual supply).

Voltage regulator that uses CA3130

A voltage regulator that uses CA3130 - Range 0.1 to 50V at 1 Amp.

CA3130 - 15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output

"15MHz, BiMOS Operational Amplifier with MOSFET Input/CMOS Output
A CMOS transistor-pair, capable of swinging the output voltage to within 10mV of either supply-voltage terminal (at very high values of load impedance), is employed as the output circuit."

Function Generator using the CA3140

Applications - Ground-Referenced Single Supply Amplifiers, Fast Sample-Hold Amplifiers, Long-Duration Timers/Monostables.

Wednesday, September 06, 2017

Offline Isolated Flyback LED Controller - LT3799-1

This chip for LED driving has a power factor correction, the critical conduction mode keeps transformer small. A opto-coupler for feedback is avoided by an innovative primary shunt monitor.

Offline Isolated Flyback LED Controller - LT3799-1

The LT3799-1 uses a micropower hysteretic start-up to efficiently operate at offline input voltages, with a third winding to provide power to the part. An internal LDO provides a well regulated supply for the part’s internal circuitry and gate driver.

LED Controller - LT3799-1

20 Watt LED Driver using LT799-1

The FAULT pin provides notification of open and short LED conditions. The LT3799-1 offers improved line regulation over the LT3799, but is not designed for use with a TRIAC dimmer.

Features
  • Offline 4W to 100W+ LED Applications
  • High DC VIN LED Applications
  • Gate driver to drive an external high voltage MOSFET.
  • Typical power factors of 0.97.