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LT6600IS8-2.5-PBF Datasheet(PDF) 9 Page - Linear Technology |
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LT6600IS8-2.5-PBF Datasheet(HTML) 9 Page - Linear Technology |
9 / 16 page LT6600-2.5 9 660025fb APPLICATIONS INFORMATION Figure 1. (S8 Pin Numbers) Interfacing to the LT6600-2.5 Note: The referenced pin numbers correspond to the S8 package. See the Pin Functions for the equivalent DFN-12 package pin numbers. The LT6600-2.5 requires two equal external resistors, RIN, to set the differential gain to 1580Ω/RIN. The inputs to the filter are the voltages VIN+ and VIN– presented to the see external components, Figure 1. The difference between VIN+ and VIN– is the differential input voltage. The aver- age of VIN+ and VIN– is the common mode input voltage. Similarly, the voltages VOUT+ and VOUT– appearing at Pins 4 and 5 of the LT6600-2.5 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 LT6600-2.5 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 forfrequenciesbelow2.5MHz.Thecommonmode 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. Figure2showshowtoACcouplesignalsintotheLT6600-2.5. 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 1580Ω gain setting resistor form a high pass filter, attenuating signals below 1kHz. Larger values of coupling capacitors will proportionally reduce this highpass 3dB frequency. In Figure 3 the LT6600-2.5 is providing 12dB of gain. The common mode output voltage is set to 2V. Figure 2. (S8 Pin Numbers) Figure 3. (S8 Pin Numbers) – + 1580Ω 1580Ω 0.01μF 0.1μF 3.3V – + VIN – VIN + 3 4 1 7 2 8 5 6 660025 F01 VOUT + VOUT – V t 3 2 1 VIN + VIN – V t 3 2 1 VOUT + LT6600-2.5 VOUT – 0 0 – + 1580Ω 1580Ω 0.01μF 0.1μF 0.1μF 0.1μF 3.3V – + VIN + 3 4 1 7 2 8 5 6 660025 F02 VOUT + VOUT – V 3 2 1 t 0 LT6600-2.5 VOUT + VOUT – 2 V t 1 0 –1 VIN + – + 402Ω 402Ω 0.1μF 0.01μF 5V – + VIN – VIN + 3 4 1 7 2 8 5 6 660025 F03 VOUT + VOUT – + – 2V V t 3 2 1 0 VOUT + VOUT – LT6600-2.5 V t 3 2 1 0 VIN + VIN – 500mVP-P (DIFF) |
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