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LTC1164-5CJ Datasheet(PDF) 9 Page - Linear Technology |
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LTC1164-5CJ Datasheet(HTML) 9 Page - Linear Technology |
9 / 12 page LTC1164-5 9 11645fc 1k 1164-5 F03 LT1056 Figure 3. Buffer for Filter Output PI FU CTIO S Butterworth/Bessel (Pin 10) The DC level at Pin 10 determines the ratio of the clock frequency to the cutoff frequency of the filter. Pin 10 at V + gives a 50:1 ratio and a Butterworth response (pins 1 to 13 are shorted for 50:1 only). Pin 10 at V – gives a 100:1 Butterworth response. Pin 10 at ground gives a Bessel response and a ratio of 140:1. For single supply operation the ratio is 50:1 when Pin 10 is at V + (Pins 1 to 13 shorted), 100:1 when Pin 10 is at ground, and 140:1 when at 1/2 supply. When Pin 10 is not tied to ground, it should be bypassed to analog ground with a 0.1 µF capacitor. If the DC level at Pin 10 is switched mechanically or electrically at slew rates greater than 1V/ µs while the device is operating, a 10k resistor should be connected between Pin 10 and the DC source. Filter Input (Pin 2) The input pin is connected internally through a 100k resistor tied to the inverting input of an op amp. Filter Output (Pins 9, 6) Pin 9 is the specified output of the filter; it can typically source or sink 1mA. Driving coaxial cables or resistive loads less than 20k will degrade the total harmonic distor- tion of the filter. When evaluating the device’s distortion an output buffer is required. A noninverting buffer, Figure 3, can be used provided that its input common mode range is well within the filter’s output swing. Pin 6 is an interme- diate filter output providing an unspecified 6th order lowpass filter. Pin 6 should not be loaded. External Connection (Pins 7, 14 and 1, 13) Pins 7 and 14 should be connected together. In a printed circuit board the connection should be done under the IC package through a short trace surrounded by the analog ground plane. When the clock to cutoff frequency ratio is set at 50:1, Pin 1 should be shorted to Pin 13; if not, the passband will exhibit 1dB of gain peaking and it will deviate from a Butterworth response. Pin 1 is the inverting input of an internal op amp and it should preferably be 0.2 inches away from any other circuit trace. NC (Pin 8) Pin 8 is not connected to any internal circuit point on the device and should be preferably tied to analog ground. Table 2. Output Clock Feedthrough VS 50:1 100:1 ±2.5V 60 µVRMS 60 µVRMS ±5V 100 µVRMS 200 µVRMS ±7.5V 150 µVRMS 500 µVRMS Note: The clock feedthrough at ±2.5V supplies is imbedded in the wideband noise of the filter. The clock waveform is a square wave. APPLICATIO S I FOR ATIO Clock Feedthrough Clock feedthrough is defined as, the RMS value of the clock frequency and its harmonics that are present at the filter’s output pin (Pin 9). The clock feedthrough is tested with the input pin (Pin 2) grounded and, it depends on PC board layout and on the value of the power supplies. With proper layout techniques the values of the clock feedthrough are shown in Table 2. |
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