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OPA4872-EP Datasheet(PDF) 11 Page - Texas Instruments |
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OPA4872-EP Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page APPLICATION INFORMATION WIDEBAND MULTIPLEXER OPERATION 75W +5V -5V OPA4872 75W 75W 75W 75W To75 Load W 523W 523W IN0 IN1 IN2 IN3 V IN0 V IN1 V IN2 V IN3 A0 A1 SD EN V OUT 0.1 F m Optional 0.01 F m 6.8 F m + 0.1 F m 6.8 F m + OPA4872-EP www.ti.com........................................................................................................................................................................................... SBOS444 – DECEMBER 2008 input of a current feedback amplifier. Depending on the logic applied to channel control pins A0 and A1, one switch is on at all times. Figure 27 represents the The OPA4872 gives a new level of performance in OPA4872 in this configuration. The truth table for wideband multiplexers. Figure 27 shows the channel selection is shown in Table 1. dc-coupled, gain of +2 V/V, dual power-supply circuit used as the basis of the ±5-V Electrical Table 1. TRUTH TABLE Characteristics and Typical Characteristic curves. For A0 A1 EN SD VOUT test purposes, the input impedance is set to 75 Ω with 0 0 0 0 IN0 a resistor to ground and the output impedance is set to 75 Ω with a series output resistor. Voltage swings 1 0 0 0 IN1 reported in the specifications are taken directly at the 0 1 0 0 IN2 input and output pins while load powers (in dBm) are 1 1 0 0 IN3 defined at a matched 75- Ω load. For the circuit of X X 1 0 High-Z, IQ = 3.4 mA Figure 27, the total effective load will be 150 Ω || X X X 1 High-Z, IQ = 1.1 mA 1046 Ω = 131 Ω. Logic pins A0 and A1 control which of the four inputs is selected while EN and SD allow The OPA4872 is in disable mode, with a quiescent for power reduction. One optional component is current of 3.4mA typical, when the EN pin is set to included in Figure 27. In addition to the usual 0V. After being placed in disable mode, the OPA4872 power-supply decoupling capacitors to ground, a is fully enabled in 6ns. For further power savings, the 0.01- µF capacitor is included between the two SD pin can be used. Setting the SD pin to 5V places power-supply pins. In practical printed circuit board the device in shutdown mode with a standing (PCB) layouts, this optional added capacitor typically quiescent current of 1.1 mA. Note that in this improves the 2nd-harmonic distortion performance by shutdown mode, the OPA4872 requires 15ns to be 3 dB to 6 dB for bipolar supply operation. fully powered again. The truth table for disable and Even though the internal architecture of the OPA4872 shutdown modes can be found in Table 1. includes current steering, it is advantageous to look at it as four switches looking into the noninverting Figure 27. DC-Coupled, G = +2V/V Bipolar Specification and Test Circuit (Channel 0 Selected) Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): OPA4872-EP |
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