JAJSLZ9A December 2021 – November 2022 LMH5485-SEP
PRODUCTION DATA
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Operating the LMH5485-SEP with a DC-coupled differential input source is very simple and only requires that the input pins stay in range of the DC common-mode operating voltage. One example is a DC-to-50 MHz quadrature down-converter output. These outputs typically sit on a DC level with some internal source impedance to the external loads. The example of Figure 9-3 shows a design using the LMH5485-SEP with a simple, passive RLC filter to the inputs (the Rg elements act as the differential termination for the filter design). From the original source behind the internal 250 Ω outputs, this circuit is a gain of 1 to the LMH5485-SEP output pins. The DC common-mode operating voltage level shifts from the 1.2 V internal, to the mixer, to an output at the ADC Vcm voltage of 0.95 V. In this case, a simple average of the two DC voltages in the gain of 1 stage gives a 1.08 V input pin common-mode result that is well within range.