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Op amp with unity-gain stability and low noise zips along at 1GHz

Norwood, MA — August 26, 2004 — Analog Devices has introduced an operational amplifier that combines an easy-to-use voltage-feedback architecture, unity-gain stability, and pin-out optimized for high-performance systems. This unique set of features, combined with 1-GHz speed, low noise, and low distortion, simplifies design and makes the AD8045 ideal for many high-speed applications including medical instrumentation, ATE, and data-acquisition systems.

The AD8045 is a unity-gain stable, 1-GHz voltage-feedback amplifier that can slew at 1350 V/μs and settle to 0.1 percent in 7.5 ns. With spurious-free dynamic range of 101 dBc at 5 MHz and low noise of 3 nV/rt Hz, the amplifier is well-suited for systems that demand high resolution at high speeds. In addition to these desirable ac specifications, the AD8045 has superior dc characteristics with a voltage offset of 200 uV and input bias current of 2 μA. The amplifier can operate on supply voltages between 3.3 V and 12 V.

The AD8045 features an advanced pin-out to enhance performance and stability over traditional amplifier pin-outs. The AD8045 uses this new standard pin-out to reduce the mutual inductance”and resulting distortion products”caused by the coupling between positive input and negative supply. Additionally, the amplifier provides two output pins to reduce feedback parasitics. This simplifies board layout and increases the stability of the amplifier.

The AD8045 is now available in full production quantities. The part is specified over the extended industrial temperature range (-40°C to +125°C) and is available in a tiny 3 mm – 3 mm LFCSP (lead-frame chip scale package) and an 8-lead SOIC (small outline integrated circuit). Both packages feature an exposed paddle that provides better thermal characteristics. In either packaging option, the device is priced at $1.39 per unit in 1,000-piece quantities.

AD8045 data sheet

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