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SP8854DKGHCAR Datasheet(PDF) 7 Page - Zarlink Semiconductor Inc |
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SP8854DKGHCAR Datasheet(HTML) 7 Page - Zarlink Semiconductor Inc |
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7 / 14 page  SP8854D 7 Bit 15 Bit 14 Current Multiplication Factor 0 0 1.0 0 1 1.5 1 0 2.5 1 1 4.0 Table 1 Pin 19 current ] Vcc * 1.6V R set I pin 19(mA) multiplication factor 2 p mA radian Phase detector gain + To allow for control direction changes introduced by the design of the PLL, pin 23 is used to reverse the sense of the phase detector by transposing the Fpd and Fref connections. In order that any external phase detector will also be reversed, the Fpd/Fref outputs are interchanged by pin 23 as shown in Table 2. Output for RF Phase Lag Control direction pin 23 Pin 20 1 Current Source 0 Current Sink Table 2 The Fpd and Fref signals to the phase detector are available on pin 24 and 25 and may be used to monitor the frequency input to the phase detector or used in conjunction with an external phase detector. The outputs are disabled by taking pin 22 low. When the Fpd and Fref outputs are to be used at high frequencies, an external pull down resistor of minimum value 330 W may be connected to ground to reduce the fall time of the output pulse. The charge pump connections to the loop amplifier consist of the charge pump output and the charge pump reference. The matching of the charge pump up and down currents will only be maintained if the charge pump output is held at a voltage equal to the charge pump reference using an operational amplifier to produce a virtual earth condition at pin 20. The lock detect circuit can drive an LED to give visual indication of phase lock or provide an indication to the control system if a pull up resistor is used in place of the LED. A small capacitor connected from the c–lock detector pin to ground may be used to delay lock detect indication and remove glitches produced by momentary phase coincidence during lock up. 40 29 28 27 26 25 24 23 22 21 20 11 PHASE M COUNTER 3 BIT A COUNTER 213 210 211 212 Fig. 6 Programming pin allocation DETECTOR GAIN CONTROL 41 42 43 44 1 23 45 6 7 89 10 See Table 1 PIN |
Similar Part No. - SP8854DKGHCAR |
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Similar Description - SP8854DKGHCAR |
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