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THS4509-Q1 Datasheet(PDF) 26 Page - Texas Instruments |
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THS4509-Q1 Datasheet(HTML) 26 Page - Texas Instruments |
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26 / 37 page  APPLICATION INFORMATION APPLICATIONS Differential Input to Differential Output Amplifier VS Single-Ended Input VS RF RF RG RG THS 4509 Differential Output V OUT+ V OUT– + – – + Input Common-Mode Voltage Range R F V OUT+ V OUT– V S+ V IN– V S– R F R G R G V IN+ THS4509 Differential Input Differential Output + – – + ÷ ÷ ø ö ç ç è æ + ´ + ÷ ÷ ø ö ç ç è æ + ´ = - + F G F IN F G G OUT IC R R R V R R R V V (1) Single-Ended Input to Differential Output Setting the Output Common-Mode Voltage THS4509-Q1 SLOS547 – NOVEMBER 2008........................................................................................................................................................................................... www.ti.com The following circuits show application information for the THS4509. For simplicity, power supply decoupling capacitors are not shown in these diagrams. See section THS4509 EVM for recommendations. For more detail on the use and operation of fully differential op amps see the application report Fully-Differential Amplifiers (SLOA054) . The THS4509 is a fully differential op amp, and can be used to amplify differential input signals to Figure 82. Single-Ended Input to Differential differential output signals. A basic block diagram of Output Amplifier the circuit is shown in Figure 81 (CM input not shown). The gain of the circuit is set by RF divided by RG. The input common-model voltage of a fully differential op amp is the voltage at the '+' and '–' input pins of the op amp. It is important to not violate the input common-mode voltage range (VICR) of the op amp. Assuming the op amp is in linear operation the voltage across the input pins is only a few millivolts at most. So finding the voltage at one input pin will determine the input common-mode voltage of the op amp. Treating the negative input as a summing node, the voltage is given by Equation 1: Figure 81. Differential Input to Differential Output To determine the VICR of the op amp, the voltage at Amplifier the negative input is evaluated at the extremes of VOUT+. Depending on the source and load, input and output termination can be accomplished by adding RIT and As the gain of the op amp increases, the input RO. common-mode voltage becomes closer and closer to the input common-mode voltage of the source. Amplifier The THS4509 can be used to amplify and convert The output common-mode voltage is set by the single-ended input signals to differential output voltage at the CM pin(s). The internal common-mode signals. A basic block diagram of the circuit is shown control circuit maintains the output common-mode in Figure 82 (CM input not shown). The gain of the voltage within 3-mV offset (typ) from the set voltage, circuit is again set by RF divided by RG. when set within 0.5 V of mid-supply, with less than 4-mV differential offset voltage. If left unconnected, the common-mode set point is set to mid-supply by internal circuitry, which may be overdriven from an external source. Figure 83 is representative of the CM input. The internal CM circuit has about 700 MHz of –3-dB bandwidth, which is required for best 26 Submit Documentation Feedback Copyright © 2008, Texas Instruments Incorporated Product Folder Link(s): THS4509-Q1 |
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