■ Features
 Low cost
 Rail-to-Rail input / output
 Unity-gain stable
 Slew rate: 0.52 (V/μs)
 Minimum power supply rejection ratio: 72dB
 Minimum common mode rejection ratio: 76dB
 Offset voltage: typically 0.8mV, 3.5mV maximum
 Gain bandwidth product: 1.1MHz
 Very low input bias current: 0.5pA
 Operating voltage range: 2.1V to 5.5V
 Input voltage range: 0.1V to +5.6 V (VS = 5.5V)
 Quiescent current: 42μA
■ Description
The LN321 (single) is rail-to-rail input and output voltage
feedback amplifier offering low cost. It has a wide input
common-mode voltage range and output voltage swing,
and takes the minimum operating supply voltage down to
2.1V and the maximum recommended supply voltage is
5.5V. All are specified over the extended –40°C to
+125°C temperature range.
The LN321 provides 1.1MHz bandwidth at a low current
consumption of 42μA per amplifier. Very low input bias
currents of 0.5pA, enable LN321 to be used for
integrators, photodiode amplifiers, and piezoelectric
sensors. Rail-to-rail inputs and outputs are useful to
designers buffering ASIC in single-supply systems.
Applications for this amplifier include safety monitoring,
portable equipment, battery and power supply control,
and signal conditioning and interfacing for transducers in
very low power systems.
■ Applications
ASIC input or output amplifiers
 Audio Output
 Handheld devices
 Mobile phones
 Notebook
 PCMCIA card