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LT6604CUFF-5-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LT6604CUFF-5-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  LT6604-5 9 66045f APPLICATIONS INFORMATION – + 806Ω 806Ω 0.01μF 0.1μF 3.3V – + VIN – VIN + 66045 F01 VOUT + VOUT – V t 3 2 1 VIN + VIN – V t 3 2 1 VOUT + 1/2 LT6604-5 VOUT – 0 0 25 27 4 34 6 2 29 7 – + 806Ω 806Ω 0.01μF 0.1μF 0.1μF 0.1μF 3.3V – + VIN + 66045 F02 VOUT + VOUT – V 3 2 1 t 0 VOUT + VOUT – 2 V t 1 0 –1 VIN + 25 27 4 34 6 2 29 7 1/2 LT6604-5 – + 200Ω 200Ω 0.1μF 0.01μF 5V – + VIN – VIN + 25 27 4 34 6 2 29 7 66045 F03 VOUT + VOUT – + – 2V V t 3 2 1 0 VOUT + VOUT – V t 3 2 1 0 VIN + VIN – 500mVP-P (DIFF) 62pF 62pF 1/2 LT6604-5 Figure 1 Figure 2 Figure 3 Interfacing to the LT6604-5 Note: The LT6604-5 contains two identical filters. The fol- lowing 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 A channel filter. Each LT6604-5 channel requires two equal external re- sistors, RIN, to set the differential gain to 806Ω/RIN. The inputs to the filter are the voltages VIN+ and VIN– presented to these 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. Similarly, the voltages VOUT+ and VOUT– appearing at Pins 27 and 29 of the LT6604-5 are the filter outputs. The difference between VOUT+ and VOUT– is the differential output voltage. The average of VOUT+ and VOUT– is the com- mon mode output voltage. Figure 1 illustrates the LT6604-5 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 5MHz. 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. Figure 2 shows how to AC couple signals into the LT6604-5. In this instance, the input is a single-ended signal. AC-cou- pling allows the processing of single-ended or differential signals with arbitrary common mode levels. The 0.1μF coupling capacitor and the 806Ω gain setting resistor form a high pass filter, attenuating signals below 2kHz. Larger values of coupling capacitors will proportionally reduce this highpass 3dB frequency. In Figure 3 the LT6604-5 is providing 12dB of gain. The gain resistor has an optional 62pF in parallel to improve the passband flatness near 5MHz. The common mode output voltage is set to 2V. |
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Similar Description - LT6604CUFF-5-TRPBF |
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