0.2 μV/°C Offset Drift, 105 MHz, Low Power, Multimode, Rail-to-Rail Amplifier

The ADA4806-1 is a high speed, voltage feedback, rail-to-rail output, single operational amplifier with three power modes: full power mode, sleep mode, and shutdown mode. In full power mode, this amplifier provides a wide bandwidth of 105 MHz at a gain of +1, a fast slew rate 160 V/μs, and excellent dc precision with a low input offset voltage of 125 μV (maximum) and an input offset voltage drift of 1.5 μV/°C (maximum), while consuming only 500 μA of quiescent current. Despite being a low power amplifier, the ADA4806-1 provides excellent overall performance, making it ideal for low power, high resolution data conversion systems.

For data conversion applications where minimizing power dissipation is paramount, the ADA4806-1 offers a method to reduce power by dynamically scaling the quiescent power of the ADC driver with the sampling rate of the system by switching the amplifier to a lower power mode between samples.

Sleep mode reduces the amplifier quiescent current to 74 μA and provides a fast turn-on time of only 0.45 μs, enabling the use of dynamic power scaling for sample rates approaching 2 MSPS. For additional power savings at lower samples rates, the shutdown mode further reduces the quiescent current to only 2.9 μA.

The ADA4806-1 operates over a wide range of supply voltages and is fully specified at supplies of 3 V, 5 V and ±5 V. This amplifier is available in a compact, 8-lead SOT-23 package and is rated to operate over the industrial temperature range of −40°C to +125°C.

Applications

* Portable and battery-powered instruments and systems

* High channel density data acquisition systems

* Precision analog-to-digital converter (ADC) drivers

* Voltage reference buffers

* Portable point of sales terminals

* Active RFID readers

* Ultralow supply current

* Full power mode: 500 μA

* Sleep mode: 74 μA

* Shutdown mode: 2.9 μA

* Dynamic power scaling

* Turn-on time from shutdown mode: 1.5 μs

* Turn-on time from sleep mode: 0.45 μs

* High speed performance with dc precision

* Input offset voltage: 125 μV maximum

* Input offset voltage drift: 1.5 μV/°C maximum

* −3 dB bandwidth: 105 MHz

* Slew rate: 160 V/ μs

* Low noise and distortion

* 5.9 nV/√Hz input voltage noise with 8 Hz 1/f corner

* −102 dBc/−126 dBc HD2/HD3 at 100 kHz

* Wide supply range: 2.7 V to 10 V

* Small package: 8-lead SOT-23