VCA8500

8通道，超低功耗可变增益放大器，具有低噪声前置放大器 8-Channel, Ultra-Low Power Variable Gain Amplifier with Low-Noise Pre-Amp

The is an 8-channel variable gain amplifier consisting of a low-noise pre-amplifier LNP and a variable-gain amplifier VGA. This combination, along with the device features, makes it ideal for a variety of ultrasound systems.

The LNP gain is fixed at 20dB, and has excellent noise and signal handling characteristics. The gain of the voltage-controlled attenuator can vary over a 46dB range with a 0V to 1.2V control voltage common to all channels of the VCA8500.

The post-gain amplifier PGA can be programmed for four gain settings: 20dB, 25dB, 27dB, or 30dB gain. As a means to improve system overload recovery time, the VCA8500 provides an internal clamping function. The PGA settings as well the clamp levels are controlled through the serial interface.

The VCA8500 is built on "s BiCOM process and is available in a small QFN-64 PowerPAD package.

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Ultralow Power: 65mW/Channel

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Low Noise: 0.8nV/Hz

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Low-Noise Pre-Amp LNP:

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20dB Fixed Gain

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250mVPP Linear Input Range

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Variable Gain Amplifier:

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Gain Control Range: 46dB

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Selectable PGA Gain:

20dB, 25dB, 27dB, 30dB

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Fast Overload Recovery

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Output Clamping Control

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Integrated Low-Pass Filter:

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Second-Order, Linear Phase

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Bandwidth: 10MHz, 15MHz

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High Accuracy:

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Low Gain Error: ±0.5dB

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Excellent Channel Matching: ±0.25dB

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Distortion, HD2: -50dBc at 5MHz

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Integrated CW Switch Matrix:

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Easy Current Summing

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Serial Control Interface

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Small Package: QFN-64, 9×9mm

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