Intersil claims with low noise step forward amplifier


The ISL55210 is a very wide band, Fully Differential Amplifier (FDA) intended for high dynamic range ADC input interface applications. This voltage feedback FDA design includes an independent output common mode voltage control.

Intended for very high dynamic range ADC interface applications, at the lowest quiescent power (115mW), the ISL55210 offers a 4.0GHz Gain Bandwidth Product with a very low input noise of 0.85nV/√(Hz). In a balanced differential I/O configuration, with 2VP-P output into a 200Ω load configured for a gain of 15dB, the IM3 terms are <-100dBc through 110MHz. With a minimum operating gain of 2V/V (6dB), the ISL55210 supports a wide range of higher gains with minimal BW or SFDR degradation. Its ultra high differential slew rate of 5,600V/µs ensures clean large signal SFDR performance or a fast settling step response.

The ISL55210 requires only a single 3.3V (max 4.2V) power supply with 35mA typical quiescent current. This industry leading low current solution can be further reduced when needed using the optional power shutdown to <0.4mA supply current. External feedback and gain setting resistors give maximum flexibility and accuracy. A companion device, the ISL55211, includes on-chip feedback and 3 possible gain setting connections where an internally fixed gain solution is preferred. The ISL55210 is available in a leadless, 16 Ld TQFN package and is specified for operation over the -40ºC to +85ºC ambient temperature range.


    • Low Power, High Dynamic Range ADC Interface
    • Differential Mixer Output Amplifier
    • SAW Filter Pre/Post Driver
    • Differential Comms-DAC Output Driver

Intersil claims step forward with low noise amplifier

Key Features

    • Gain Bandwidth Product: 4.0GHz
    • Input Voltage Noise: 0.85nV/√(Hz)
    • Differential Slew Rate: 5,600V/µs
    • 2VP-P, 2-tone IM3 (200Ω) 100MHz: -109dBc
    • Supply Voltage Range: 3.0V to 4.2V
    • Quiescent Power (3.3V Supply): 115mW

Intersil has addressed the design requirement for low distortion driver amplifiers in the signal chain with a differential I/O amplifier which it claims has “the industry’s best SFDR and SNR performance at the lowest total power.”

“The ISL55210 noise is negligible with respect to the ADC, so adding gain and filtering will have virtually no impact on a system’s SNR,” said the company

Power consumption is 115mW.

The device provides a 4GHz gain bandwidth with input noise of only 0.85nV/rootHz.

Distortion is specified at -94dBc at 140MHz (IM3).

In addition, the amplifier’s balanced architecture suppresses even-order harmonic distortion, which is usually caused by asymmetrical or unbalanced signal paths.


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