LMH5401 Fully Differential Amplifier

By Texas Instruments 65

Texas Instruments' LMH5401 is a very high-performance, differential amplifier optimized for radio frequency (RF), intermediate frequency (IF), or high-speed, dc-coupled, time-domain applications. The device is ideal for DC- or AC-coupled applications that may require a single-ended-to-differential (SE-DE) conversion when driving an analog-to-digital converter (ADC). The LMH5401 generates very low levels of second- and third-order distortion when operating in SE-DE or differential-to-differential (DE-DE) mode.

The amplifier is optimized for use in both SE-DE and DE-DE systems. The device has unprecedented usable bandwidth from DC to 2 GHz. The LMH5401 can be used for SE-DE conversions in the signal chain without external baluns in a wide range of applications such as test and measurement, broadband communications, and high-speed data acquisition.

Features
Gain Bandwidth Product (GBP): 8 GHz Excellent linearity performance: DC to 2 GHz, G=12 dB Slew rate: 17,500 V/µs Low HD2, HD3 distortion (1 VPP, 200 Ω, DE-DE, G=12 dB): 100 MHz: HD2 at –104 dBc, HD3 at –96 dBc 200 MHz: HD2 at –95 dBc, HD3 at –92 dBc 500 MHz: HD2 at –80 dBc, HD3 at –77 dBc 1 GHz: HD2 at –64 dBc, HD3 at –58 dBc	Low IMD2, IMD3 distortion (2 VPP, 200 Ω, DE-DE, G=12 dB): 200 MHz: IMD2 at –96 dBc, IMD3 at –95 dBc 500 MHz: IMD2 at –80 dBc, IMD3 at –83 dBc 1 GHz: IMD2 at –70 dBc, IMD3 at –63 dBc Input voltage noise: 1.25 nV/√Hz Input current noise: 3.5 pA/√Hz Supports single- and dual-supply operation

Applications
GSPS ADC drivers ADC drivers for high-speed data acquisition ADC drivers for 1 GBPS Ethernet over microwave DAC buffers	IF, RF, and baseband gain blocks SAW filter buffers and drivers Balun replacement DC to 2 GHz Level shifters

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LMH5401 Fully Differential Amplifier

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