High speed, 40-V rail, 1-A output drive amplifier

June 16, 2014 // By Graham Prophet
Analog Devices has posted details of the ADA4870, a unity-gain-stable, high speed current feedback amplifier capable of delivering 1A of output current and 2500 V/μsec slew rate from a 40V supply.

Manufactured in a high voltage extra fast complementary bipolar (XFCB) process, the architecture of the ADA4870 enables high output power, high speed signal processing solutions in applications that require driving a low impedance load, such as driving high voltage power FETs, piezo transducers, PIN diodes, CCD panels, and a variety of other demanding applications that require high speed from high supply voltage at high output current.

The ADA4870 is available in a power SOIC package (PSOP_3), featuring an exposed thermal slug that provides high thermal conductivity, enabling efficient heat transfer for improved performance and reliability. The ADA4870 operates over the industrial temperature range (−40°C to +85°C).

Applications include; envelope tracking; power FET driver; ultrasound; waveform generation; automated test equipment (ATE); and composite amplifiers. Able to drive high capacitive or low resistive loads, it has a supply range of 10 to 40V, with output voltage swing of 37V at 40V supply. Noise is 2.1 nV/√Hz, bandwidth 52 MHz large signal, 70 MHz small signal; quiescent current is: 32.5 mA (power down: 0.75 mA); and it has short-circuit protection with flag, with a 1.2A current limit and thermal protection.

Analog Devices; www.analog.com/en/high-speed-op-amps/high-output-current-amplifiers/ada4870/products/product.html