GENERAL DESCRIPTION:

The ADA4805-1/ADA4805-2 are high speed voltage feedback,rail-to-rail output amplifiers with an exceptionally lowquiescent current of 500 µA, making them ideal for low power,high resolution data conversion systems. Despite being lowpower, these amplifiers provide excellent overall performance.They offer a high bandwidth of 105 MHz at a gain of +1, a highslew rate of 160 V/µs, and a low input offset voltage of 125 µV(maximum).A shutdown pin allows further reduction of the quiescentsupply current to 2.9 µA. For power sensitive applications, theshutdown mode offers a very fast turn-on time of 3 µs. Thisallows the user to dynamically manage the power of theamplifier by turning the amplifier off between ADC samples.

The Analog Devices, Inc., proprietary extra fast complementarybipolar (XFCB) process allows both low voltage and low currentnoise (5.9 nV/√Hz, 0.6 pA/√Hz). The ADA4805-1/ADA4805-2operate 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 idealfor high speed, low power instruments.The ADA4805-1 is available in a 6-lead SOT-23 and a 6-leadSC70 package. The ADA4805-2 is available in an 8-lead MSOPand a 10-lead LFCSP package. These amplifiers are rated towork over the industrial temperature range of −40°C to +125°C.

FEATURES:

Low input offset voltage: 125 µV (maximum)

Low input offset voltage drift0.2 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

Input common-mode range: −VS − 0.1 V to +VS − 1 V

Low noise: 5.9 nV/√Hz at 100 kHz; 0.6 pA/√Hz at 100 kHz

Low distortion: −102 dBc/−126 dBc HD2/HD3 at 100 kHz

Low input bias current: 470 nA (typical)

Dynamic power scaling

Turn-on time: 3 µs (maximum) fully settled

Small packaging6-lead SC70, 

6-lead SOT-23, and 8-lead MSOP

APPLICATIONS:

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

Battery-powered instrumentation

Micropower active filters

Portable point of sales terminals

Active RFID readers

Photo multipliers

ADC reference buffers