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LTC6401CUD-14-TRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC6401CUD-14-TRPBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 16 page LTC6401-14 10 640114f Referring to Figure 3, LTC6401-14 can be easily configured for single-ended input and differential output without a balun. The signal is fed to one of the inputs through a matching network while the other input is connected to the same matching network and a source resistor. Because the return ratios of the two feedback paths are equal, the two outputs have the same gain and thus symmetrical swing. In general, the single-ended input impedance and termination resistor RT are determined by the combination of RS, RG and RF. For example, when RS is 50Ω, it is found that the single-ended input impedance is 185Ω and RT is 68.5Ω in order to match to a 50Ω source impedance. Figure 4. Calculate Differential Gain APPLICATIONS INFORMATION Figure 3. Input Termination for Single-Ended 50Ω Input Impedance and noise is obvious when constant noise figure circle and constant gain circle are plotted within the input Smith Chart, based on which users can choose the optimal source impedance for a given gain and noise requirement. Output Impedance Match and Filter The LTC6401-14 can drive an ADC directly without external output impedance matching. Alternatively, the differential output impedance of 25Ω can be made larger, e.g. 50Ω, by series resistors or LC network. The internal low pass filter outputs at +OUTF/–OUTF have a –3dB bandwidth of 590MHz. External capacitors can reduce the lowpass filter bandwidth as shown in Figure 5. A bandpass filter is easily implemented with Figure 5. LTC6401-14 Internal Filter Topology Modified for Low Filter Bandwidth (Three External Capacitors) 640114 F03 +OUT +OUTF –OUTF –OUT +IN IN+ OUT– IN– OUT+ +IN –IN –IN 100 Ω RT 68.5 Ω 0.1 μF 0.1 μF 12.5 Ω 500 Ω LTC6401-14 100 Ω RS 50 Ω VIN 500 Ω 12.5 Ω 50 Ω 50 Ω 2.7pF 13 14 15 16 7 5 6 8 + – 0.1 μF 29 Ω 640114 F04 +OUT +OUTF –OUTF –OUT +IN IN+ OUT– IN– OUT+ +IN –IN –IN 100 Ω 12.5 Ω 500 Ω LTC6401-14 100 Ω 1/2 RS 1/2 RS VIN VOUT 500 Ω 12.5 Ω 50 Ω 50 Ω 2.7pF 13 14 15 16 7 5 6 8 + – 1/2 RL 1/2 RL 640114 F05 +OUT +OUTF –OUTF –OUT +IN IN+ OUT– IN– OUT+ +IN –IN –IN 100 Ω 12.5 Ω 500 Ω LTC6401-14 100 Ω 500 Ω 12.5 Ω 50 Ω 50 Ω 2.7pF 13 14 15 16 7 5 6 8 8pF 8pF 12pF FILTERED OUTPUT (87.5MHz) The LTC6401-14 is unconditionally stable, i.e. differential stability factor Kf>1 and stability measure B1>0. However, the overall differential gain is affected by both source impedance and load impedance as shown in Figure 4: A V VR R R V OUT IN S L L == ++ 1000 200 25 • The noise performance of the LTC6401-14 also depends upon the source impedance and termination. For example, an input 1:4 transformer in Figure 2 improves SNR by adding 6dB gain at the inputs. A trade-off between gain |
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