SBOS710D October 2014 – February 2018 LMH5401
The LMH5401 is a very high-performance, differential amplifier optimized for radio frequency (RF) and intermediate frequency (IF) or high-speed, time-domain applications for wide bandwidth applications as the GBP is 8 GHz. The device is designed 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 required external feedback (RF) and gain set (RG) resistors configure the gain of the device. For the EVM the standard gain is set to G = 12 dB (for DE and SE conversions) with RF = 127 Ω and RG = 22.6 Ω.
A common-mode reference input pin aligns the amplifier output common-mode with the ADC input requirements. Power supplies between 3.3 V and 5 V are selected and dual-supply operation is supported when required by the application. A power-down feature is available for power savings.
The LMH5401 offers two on-chip termination resistors, one for each output with values of 10 Ω each. For most load conditions the 10-Ω resistors are a partial termination. Consequently, external termination resistors are required in most applications. See Table 4 for some common load values and the matching resistors.