OPA615

宽带 DC 恢复电路

The is a complete subsystem for very fast and precise DC restoration, offset clamping, and low-frequency hum suppression of wideband amplifiers or buffers. Although it is designed to stabilize the performance of video signals, the circuit can also be used as a sample-and-hold amplifier, high-speed integrator, or peak detector for nanosecond pulses. The device features a wideband Operational Transconductance Amplifier OTA with a high-impedance cascode current source output and fast and precise sampling comparator that together set a new standard for high-speed applications. Both the OTA and the sampling comparator can be used as stand-alone circuits or combined to form a more complex signal processing stage. The self-biased, bipolar OTA can be viewed as an ideal voltage-controlled current source and is optimized for low input bias current. The sampling comparator has two identical high-impedance inputs and a current source output optimized for low output bias current and offset voltage; it can be controlled by a TTL-compatible switching stage within a few nanoseconds. The transconductance of the OTA and sampling comparator can be adjusted by an external resistor, allowing bandwidth, quiescent current, and gain trade-offs to be optimized.

The OPA615 is available in both an SO-14 surface-mount and an MSOP-10 package.

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PROPAGA ON DELAY: 1.9ns

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BANDWIDTH:

OTA: 710MHz

Comparator: 730MHz

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LOW INPUT BIAS CURRENT: ±1µA

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SAMPLE-AND-HOLD SWITCHING TRANSIENTS: ±5mV

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SAMPLE-AND-HOLD FEEDTHROUGH REJECTION: 100dB

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CHARGE INJECTION: 40fC

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HOLD COMMAND DELAY TIME: 2.5ns

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TTL/CMOS HOLD CONTROL

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APPLICATIONS

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BROADCAST/HDTV EQUIPMENT

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TELECOMMUNICATIONS EQUIPMENT

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HIGH-SPEED DATA ACQUISITION

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CAD MONITORS/CCD IMAGE PROCESSING

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NANOSECOND PULSE INTEGRATOR/PEAK DETECTOR

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PULSE CODE MODULATOR/DEMODULATOR

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COMPLETE VIDEO DC LEVEL RESTORATION

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SAMPLE-AND-HOLD AMPLIFIER

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SHC615 UPGRADE

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