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ADS5500MPAPREP Datenblatt(PDF) 26 Page - Texas Instruments |
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ADS5500MPAPREP Datenblatt(HTML) 26 Page - Texas Instruments |
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26 / 37 page ![]() ADS5500-EP SGLS286C − JUNE 2005 – REVISED SEPTEMBER 2008 www.ti.com 26 Table 4. Recommended Amplifiers to Drive Input of ADS5500 INPUT SIGNAL FREQUENCY RECOMMENDED AMPLIFIER TYPE OF AMPLIFIER USE WITH TRANSFORMER? DC to 20 MHz THS4503 (1) Differential in/out amplifier No DC to 50 MHz OPA847 (1) Operational amplifier Yes OPA695 (1) Operational amplifier Yes 10 MHz to 120 MHz THS3201 (1) Operational amplifier Yes 10 MHz to 120 MHz THS3202 (1) Operational amplifier Yes Over 100 MHz THS9001 (1) RF gain block Yes (1) Potential EP devices R IN R IN C IN 0.1 mF R T 100 W 0.1 mF 1000pF 1:1 R S 100 W OPA695 R 1 400 W A V =8V/V (18dB) R 2 57.5 W V IN ADS5500 INP INM CM -5V +5V 10 W Figure 7. Converting Single-Ended Input Signal to Differential Signal Using an RF Transformer R F R G V OCM INP INM CM R F R G R S ADS5500 14−Bit/125MSPS 0.1 mF 0.1 mF 10 mF 1 mF R T +3.3V +5V 0.1 mF 10 mF -5V THS4503 R IN R IN 10 W Figure 8. Using THS4503 With ADS5500 POWER−SUPPLY SEQUENCE The ADS5500 requires a power-up sequence where the DRVDD supply must be at least 0.4 V by the time the AVDD supply reaches 3 V. Powering up both supplies at the same time works without any problem. If this sequence is not followed, the device may stay in power-down mode. |
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