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LTC1061CSW Datasheet(PDF) 6 Page - Linear Technology |
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LTC1061CSW Datasheet(HTML) 6 Page - Linear Technology |
6 / 16 page LTC1061 6 1061fe Figure 1. The 6th Order LP Butterworth Filter of Figure 5 Operating with a Single 5V Supply 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 R3 VOUT R1 VIN 0.1 µF 1061 F01 LTC1061 + R2 R1 R3 R2 R4 R1 R3 R2 T2L CLOCK IN fCLK < 1MHz 1 µF 5V 2.49k 2.49k CIN Clock Feedthrough This is defined as the amplitude of the clock frequency appearing at the output pins of the device, Figure 2. Clock feedthrough is measured with all three sides of the LTC1061 connected as filters. The clock feedthrough mainly de- pends on the magnitude of the power supplies and it is independent from the input clock levels, clock frequency and modes of operation. The Table 2 illustrates the typical clock feedthrough num- bers for various power supplies. 50/100/Hold (Pin 7) By tying Pin 7 to V+, the filter operates with a clock-to- center frequency internally set at 50:1. When Pin 7 is at mid-supplies, the filter operates with a 100:1 clock-to- center frequency ratio. Table 1 shows the allowable varia- tion of the potential at Pin 7 when the 100:1 mode is sought. When Pin 7 is shorted to the negative supply pin, the filter operation is stopped and the bandpass and lowpass output act as a sample-and-hold circuit holding the last sample of the input voltage. The hold step is around 2mV and the droop rate is 150 µV/sec. Table 1 TOTAL POWER SUPPLY VOLTAGE RANGE OF PIN 7 (V) FOR 100:1 OPERATION (V) 5 2.5 ± 0.5 10 5 ±1 15 7.5 ±1.5 Figure 2. Typical Clock Feedthrogh of the LTC1061 Operating with ±5V Supplies. Top Trace is the Input Clock Swinging 0V to 5V and Bottom Trace is One of the Lowpass Outputs with Zero or DC Input Signals. A = 2V/DIV B = 10mV/DIV HORIZONTAL = 10 µs/DIV POWER SUPPLY (V) CLOCK FEEDTHROUGH (VRMS) ±2.5 0.2 ±5 0.4 ±8 0.8 Table 2 Definition of Filter Functions Refer to LTC1060 data sheet. 1061 F02 DESCRIPTIO A D PI APPLICATIO HI TS |
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