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LT6604-10 Datasheet(PDF) 9 Page - Linear Technology |
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LT6604-10 Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page LT6604-10 9 660410fb APPLICATIONS INFORMATION Interfacing to the LT6604-10 Note: The LT6604-10 contains two identical filters. The following applications information only refers to one filter. The two filters are independent except that they share the same negative supply voltage V–. The two filters can be used simultaneously by replicating the example circuits. The referenced pin numbers correspond to the channel A filter. The LT6604-10 channel requires two equal external resis- tors, RIN,tosetthedifferentialgainto402Ω/RIN.Theinputs to the filter are the voltages VIN+andVIN–presentedtothese external components, Figure 1. The difference between VIN+ and VIN– is the differential input voltage. The average of VIN+ and VIN– is the common mode input voltage. Simi- larly, the voltages VOUT+ and VOUT– appearing at Pins 27 and 29 of the LT6604-10 are the filter outputs. The differ- ence between VOUT+ and VOUT– is the differential output voltage. The average of VOUT+ and VOUT– is the common mode output voltage. Figure 1 illustrates the LT6604-10 operating with a single 3.3V supply and unity passband gain; the input signal is DC coupled. The common mode input voltage is 0.5V, and the differential input voltage is 2VP-P. The common mode output voltage is 1.65V, and the differential output voltage is 2VP-P for frequencies below 10MHz. The common mode output voltage is determined by the voltage at VOCM. Since VOCM is shorted to VMID, the output common mode is the mid-supply voltage. In addition, the common mode input voltage can be equal to the mid-supply voltage of VMID. Figure2showshowtoACcouplesignalsintotheLT6604-10. In this instance, the input is a single-ended signal. AC coupling allows the processing of single-ended or dif- ferential signals with arbitrary common mode levels. The 0.1μF coupling capacitor and the 402Ω gain setting resistor form a high pass filter, attenuating signals below 4kHz. Larger values of coupling capacitors will proportionally reduce this highpass 3dB frequency. – + 402Ω 402Ω 0.01μF 0.1μF 3.3V – + VIN – VIN + 25 27 4 34 6 2 29 7 660410 F01 VOUT + VOUT – V t 3 2 1 VIN + VIN – V t 3 2 1 VOUT + VOUT – 0 0 1/2 LT6604-10 – + 402Ω 402Ω 0.01μF 0.1μF 0.1μF 0.1μF 3.3V – + VIN + 25 27 4 34 6 2 29 7 660410 F02 VOUT + VOUT – V 3 2 2 1 V t 1 0 0 –1 VIN + VOUT + VOUT – 1/2 LT6604-10 Figure 1 Figure 2 |
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