ISL55211 Wideband, low noise, low distortion, fixed gain differential amplifier
Key features:
- 3 fixed gain options: 2, 4, or 5V/V
- The constant gain bandwidth exceeds 1.4GHz
- Differential slew rate: 5600 V/μs
- 2V PP, two-tone three-step intermodulation (200Ω) 100MHz: -103dBc
- 低差分输出噪声（增益5V / V）：
- Supply voltage range: 3.0V to 4.2V
- Quiescent power consumption (3.3V supply): 115MW
description
ISL55211 is wideband, differential input, differential output amplifier offers 3 possible internal gain settings. Using a fixed 500Ω internal feedback resistor, the amplifier can be configured to 2, 4, or 5V/V depending on the differential gain of the combined input pin being connected to the source. The internal feedback capacitor controls the signal bandwidth of a constant 1. 4GHz in all gain settings.
Ideal for AC-coupled data acquisition applications, the output DC common-mode voltage is controlled via an external VCM pin, or a negative supply pin above 1.2V by default. Where the differential signal source is AC coupled, it will be equal to the output common-mode voltage of the input common-mode voltage.
Applications with very high dynamic range ADC interfaces are expected ISL55211 to provide a differential slew rate of 5600V/μs, 12nV/√Hz output noise, > 100dBc SFDR> 2V PP 100MHz two-tone third-order intermodulation. Its balanced architecture effectively suppresses even order distortion terms - an important problem for the application of ADC interfaces in the first Nyquist region of the very wide frequency band. Its ultra-high differential slew rate of 5600V/μs provides sufficient performance margin for high-signal applications at 500MHz.
ISL55211 requires only one 3.3V (4.2V max) supply and 35 mA quiescent current, providing a very low power solution (115MW). 进一步节省功率，可以使用选配的电源关断控制 - ，那里的静态电流可降低到 The companion equipment ISL55210 provides similar feedback and gain resistors for external performance. Both are available in a 16-pin TQFN package (lead-free) and are specified to operate over an ambient temperature range of -40°C to +85°C.
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