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AFE8405 Datasheet(PDF) 25 Page - Texas Instruments |
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AFE8405 Datasheet(HTML) 25 Page - Texas Instruments |
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25 / 152 page  S0175-01 VINCM 1V + inm inp L 1 L 2 R 1a R 1b C A S 3a CP 1 CP 2 CP 3 CP 4 R 3 – L ,L ,:6nHto10nHeffective 1 2 R ,R :5 to8 C ,C :2.2pFto2.6pF CP ,CP :1.8pFto2.2pF CP ,CP :1.2pFto1.8pF C :0.8pFto1.2pF R :80 to120 Switches: 1a 1b 1a 1b 1 2 3 4 A 3 W W W W S ,S :OnResistance:35 to50 S :OnResistance:7.5 to15 S ,S :OnResistance:40 to60 AllswitchesOffResistance:10G 1a 1b 2 3a 3b W W W W W W W Allswitchesareoninsamplingphasewhichisapproximatelyonehalfofaclockperiod. C 1a S 1a S 1b S 2 S 3b C 1b AFE8405 14-BIT, 85-MSPS, SINGLE-ADC, 8-CHANNEL WIDEBAND RECEIVER www.ti.com SLWS212 – OCTOBER 2008 Figure 6-2. Analog Input Stage This differential input topology produces a high level of ac performance for high sampling rates. It also results in a high usable input bandwidth, especially important for high intermediate-frequency (IF) or undersampling applications. The ADC requires each of the analog inputs (inp, inm) to be externally biased around the common-mode level of the internal circuitry (cmx). For a full-scale differential input, each of the differential lines of the input signal swings symmetrically between cm + 0.575 V and cm – 0.575 V. This means that each input is driven with a signal of up to cm ± 0.575 V, so that each input has a maximum differential signal of 1.15 VPP for a total differential input signal swing of 2.3 VPP. The maximum swing is determined by the two reference voltages, the top reference (refpa) and the bottom reference (refma). The ADC obtains optimum performance when the analog inputs are driven differentially. The circuit shown in Figure 6-3 shows one possible configuration using an RF transformer. Submit Documentation Feedback ANALOG-TO-DIGITAL CONVERTERS 25 |
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