Texas Instruments Launches Latest Current Feedback Amplifier for Differential Signals

(Product News, 25 Jun 2008)

Texas Instruments Inc. (TI) has developed a dual-channel, high-speed current feedback amplifier that features 70 percent greater bandwidth gain at +2V/V than competitive devices. Featuring fast signal conditioning with improved linearity to minimize distortion for better signal fidelity and easier filtering, the amplifier offers wide supply voltage options and large gain capability, giving engineers the flexibility to adjust the parameters to address the specific need, such as high gain for differential signals or high output voltage or current for low power consumption. In addition, the device's optimized symmetrical package eases layout for cost-effective precision IF amplifiers, high-speed arbitrary waveform output drivers, wideband analog-to-digital converter (ADC) drivers and active filters.

With a current feedback architecture, the OPA2695 can deliver a high bandwidth of 850MHz and a fast slew rate of 2,900V/µs to process high-speed signals. The architecture also provides wider bandwidth capability at much higher gains than can be achieved with a voltage feedback architecture.

The OPA2695 provides second-order harmonics (HD2) of 94dBc and third-order harmonics (HD3) of 93.5dBc at 10MHz for differential signals, and HD2 of better than 90dBc up to 55MHz at a large gain of +10V/V, which reduces in-band harmonic distortion while easing the filtering of out-of-band even order harmonics.

In addition, designers have the flexibility to provide a single supply voltage (3.5V to 12V) or a dual supply voltage (±1.75 V to ±6V) to the OPA2695 to suit their requirements.

Alternatively, at a lower single supply voltage of +5V, the device can save power while still delivering ±90mA output current with a 3.4Vpp for power-sensitive applications, such as handheld portable devices. To further reduce power consumption, a power down option is also available, which reduces the quiescent current consumption to 80µA.

Click here for more information on Texas Instruments' OPA2695 current feedback amplifier


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