Dual, 0.2 µV/°C Offset Drift, 105 MH Low Power, Low Noise, Rail-to-Rail Amplifier

The ADA4805-1/ADA4805-2 are high speed voltage feedback, rail-to-rail output amplifiers with an exceptionally low quiescent current of 500 µA, making them ideal for low power, high resolution data conversion systems. Despite being low power, these amplifiers provide excellent overall performance. They offer a high bandwidth of 105 MHz at a gain of +1, a high slew rate of 160 V/µs, and a low input offset voltage of 125 µV (maximum).

A shutdown pin allows further reduction of the quiescent supply current to 2.9 µA. For power sensitive applications, the shutdown mode offers a very fast turn on time of 3 µs. This allows the user to dynamically manage the power of the amplifier by turning the amplifier off between ADC samples.

The Analog Devices, Inc., proprietary extra fast complementary bipolar (XFCB) process allows for both low voltage and low current noise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1/ADA4805-2 operate over a wide range of supply voltages from ±1.5 V to ±5 V, as well as single 3 V and 5 V supplies, making them ideal for high speed, low power instruments.

The ADA4805-1 is available in a 6-lead SOT-23 and a 6-lead SC70 package. The ADA4805-2 is available in an 8-lead MSOP package. These amplifiers are rated to work over the industrial temperature range of −40°C to +125°C.

Applications

* High resolution, high precision analog-to-digital converter (ADC) drivers

* Battery-powered instrumentation

* Micropower active filters

* Portable point of sales terminals

* Active radio frequency identification (RFID) readers

* Photo multipliers

* ADC reference buffers

* Low input offset voltage: 125 µV (maximum)

* Low input offset voltage drift

* 0.2 µV/°C (typical)

* 1.5 µV/°C (maximum)

* Ultralow supply current: 500 µA per amplifier

* Fully specified at VS = 3 V, 5 V, ±5 V

* High speed performance

* −3 dB bandwidth: 105 MHz

* Slew rate: 160 V/µs

* Settling time to 0.1%: 35 ns

* Rail-to-rail outputs

* See data sheet for additional features