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15696 Datasheet(PDF) 6 Page - Linear Technology |
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15696 Datasheet(HTML) 6 Page - Linear Technology |
6 / 12 page 6 LTC1569-6 BLOCK DIAGRA 10TH ORDER LINEAR PHASE FILTER NETWORK POWER CONTROL DIVIDER/ BUFFER REXT PRECISION OSCILLATOR 5 6 7 8 4 3 2 1 OUT V+ RX DIV/CLK IN+ IN– GND V– 1569-6 BD APPLICATIONS INFORMATION Self-Clocking Operation The LTC1569-6 features a unique internal oscillator which sets the filter cutoff frequency using a single external resistor. The design is optimized for VS = 3V, fCUTOFF = 64kHz, where the filter cutoff frequency error is typically <1% when a 0.1% external 10k resistor is used. With different resistor values and internal divider settings, the cutoff frequency can be accurately varied from 1kHz to 64kHz. As shown in Figure 1, the divider is controlled by the DIV/CLK (Pin 5). Table 1 summarizes the cutoff frequency vs external resistor values for the divide-by-1 mode. LTC1569-6 18 27 36 45 DIVIDE-BY-4 DIVIDE-BY-1 DIVIDE-BY-16 V+ V– REXT 100pF fCUTOFF = 64kHz (10k/REXT) 1, 4 OR 16 1569-6 F01 IN+ IN– GND V– OUT V+ RX DIV/CLK Figure 1 Table1. fCUTOFF vs REXT, VS = 3V, TA = 25°C, Divide-by-1 Mode REXT Typical fCUTOFF Typical Variation of fCUTOFF 3844 Ω* N/A ±3.0% 5010 Ω* N/A ±2.5% 10k 64kHz ±1% 20.18k 32kHz ±2.0% 40.2k 16kHz ±3.5% *REXT values less than 10k can be used only in the divide-by-16 mode. In the divide-by-4 and divide-by-16 modes, the cutoff frequencies in Table 1 will be lowered by 4 and 16 respectively. When the LTC1569-6 is in the divide-by-4 and divide-by-16 modes the power is automatically re- duced. This results in up to a 40% power savings. The power reduction in the divide-by-4 and divide-by-16 modes, however, effects the fundamental oscillator fre- quency. Hence, the effective divide ratio will be slightly different from 4:1 or 16:1 depending on VS, TA and REXT. Typically this error is less than 1% (Figures 4 and 6). The cutoff frequency is easily estimated from the equation in Figure 1. Examples 1 and 2 illustrate how to use the graphs in Figures 2 through 7 to get a more precise estimate of the cutoff frequency. Example 1: LTC1569-6, REXT = 20k, VS = 3V, divide-by-16 mode, DIV/CLK (Pin 5) connected to V + (Pin 7), TA = 25°C. |
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