The LTC72x family of single-, dual-, and quad- channel operational amplifiers represents a new generation of general-purpose, low-power op-amps. Featuring railto-rail input and output (RRIO) swings, low quiescent current (typical 780 µA) combined with a wide bandwidth (11 MHz) and very low noise (8 nV/√Hz at 1 kHz) makes this family very attractive for a variety of battery-powered applications that require a good balance between cost and performance, such as audio outputs, motor phase current sensing,photodiode amplification, barcode scanners and white goods. The low input bias current supports these amplifiers to be used in applications with mega-ohm source impedances.

The robust design of the LTC72x amplifiers provides ease-of-use to the circuit designer:unity-gain stability with capacitive loads of up to 500 pF, integrated RF/EMI rejection filter, no phase reversal in overdrive conditions, and high electro-static discharge (ESD) protection (5-kV HBM). The LTC72x amplifiers are optimized for operation at voltages as low as +1.8 V (± 0.9 V) and up to +5.5 V (± 2.75 V) at the temperature range of 0 ℃ to 70 ℃, and operation at voltages from +2.0 V (± 1.0 V) to +5.5 V (± 2.75 V) over the extended temperature range of −40 ℃ to +125 ℃.

The LTC721/LTC723 (single) is available in SOT23-5L, SC70-5L and SOIC-8L packages.The LTC722 (dual) is offered in DFN2x2-8L, SOIC-8L, MSOP-8L and SOT23-8L packages.The quad of LTC724 is offered in both SOIC-14L and TSSOP-14L packages

Electret Microphone Pre-Amplifier

Advantages And Characteristics

  • Wide Bandwidth and High Slew Rate: 11 MHz and 11.5 V/μs
  • Fast Settling: 0.26 μs to 0.1%
  • Low Noise: 8 nV/√Hz at 1 kHz
  • Low Input Offset Voltage: ± 0.5 mV
  • Single 1.8 V to 5.5 V Supply Voltage Range at 0 ℃ to 70 ℃
  • Rail-to-Rail Input and Output
  • Internal RF/EMI Filter
  • Low Supply Current: 780 μA at 5.5V Supply Per Amplifier
  • Extended Temperature Range: -40℃ to +125℃


  • Battery-Powered Instruments:
– Consumer, Industrial, Medical, Notebooks
  • Audio Outputs
  • Motor Phase Current Sense
  • Photodiode Amplification
  • Sensor Signal Conditioning:
– Sensor Interfaces, Loop-Powered, Active Filters
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