LTC6420IUDC-20#PBF

Overview

The LTC6420IUDC-20#PBF is a dual high-speed differential amplifier and ADC driver from Analog Devices, designed for processing signals from DC to 300MHz. It features a fixed gain of 20dB (10V/V) with a 1.8GHz -3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V, consuming 80mA per amplifier. Key electrical characteristics include a noise figure of 6.2dB, an equivalent output third-order intercept point (OIP3) of 46dBm at 100MHz, and a slew rate of 4500 V/µs. It provides rail-to-rail output swing and allows adjustable output common mode voltage between 1.1V and 1.6V via external pins.

Feature Summary

• Dual matched amplifiers with channel-to-channel gain matching of ±0.1dB and phase matching of ±0.1° at 100MHz.
• Integrated output common mode voltage control eliminates the need for transformers or AC-coupling capacitors in many applications.
• Designed specifically to drive 12-, 14-, and 16-bit ADCs with low noise and low distortion performance.
• Supports both DC and AC coupling operation with differential inputs and outputs.

Applications

• Differential ADC Driver
• Single Ended to Differential Conversion
• IF Sampling (Diversity) Receivers
• Broadband I/Q Amplifiers
• Satellite Communications

Procurement Notes

Verify the specific temperature grade suffix 'I' corresponds to the –40°C to 85°C operating range required for your design environment. Confirm that the 20-lead QFN package dimensions align with your PCB footprint constraints. Ensure power supply decoupling meets the datasheet recommendations for stable operation at high frequencies.

Selection Notes

Select this component when a fixed 20dB gain is required for broadband signal processing up to 300MHz. Consider the dual-channel architecture for applications requiring precise gain and phase matching between channels. Evaluate the 80mA supply current against system power budgets compared to lower-power alternatives like the LTC6401 series if power consumption is critical.

Part Context

This part belongs to the LTC6420-20 family of dual matched differential amplifiers. It shares the same core architecture as the commercial grade LTC6420CUDC-20#PBF but is specified for industrial temperature ranges. It complements other members of the LTC64xx series which offer different gain settings or single-channel configurations.

Replacement Considerations

LTC6420CUDC-20#PBF