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660025 Datasheet(PDF) 6 Page - Linear Technology |
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660025 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page LT6600-2.5 6 660025i APPLICATIO S I FOR ATIO Figure 1 Figure 2 Figure 3 Interfacing to the LT6600-2.5 The LT6600-2.5 requires two equal external resistors, RIN, to set the differential gain to 1580 Ω/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 4 and 5 of the LT6600-2.5 are the filter outputs. The difference 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 for frequencies below 2.5MHz. The common mode output voltage is determined by the voltage at pin 2. Since pin 2 is shorted to pin 7, 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 Pin 7. Figure 2 shows how to AC couple signals into the LT6600-2.5. In this instance, the input is a single-ended signal. AC coupling allows the processing of single-ended or differential signals with arbitrary common mode levels. The 0.1 µF coupling capacitor and the 1580Ω gain setting resistor form a high pass filter, attenuating signals below 1kHz. Larger values of coupling capacitors will propor- tionally reduce this highpass 3dB frequency. – + 1580 Ω 1580 Ω 0.01 µF 0.1 µF 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 – + 1580 Ω 1580 Ω 0.01 µF 0.1 µF 0.1 µF 0.1 µF 3.3V – + VIN + 3 4 1 7 2 8 5 6 660025 F02 VOUT + VOUT – V 3 2 2 1 V t 1 0 0 –1 VIN + LT6600-2.5 VOUT + VOUT – – + 402 Ω 402 Ω 0.1 µF 0.01 µF 5V – + VIN – VIN + 3 4 1 7 2 8 5 6 660025 F03 VOUT + VOUT – + – 2V V t 3 2 1 0 VIN + VIN – V t 3 2 1 0 VOUT + VOUT – LT6600-2.5 500mVP-P (DIFF) |
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