SP8861 Mitel Networks, SP8861 Datasheet
SP8861
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SP8861 Summary of contents
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... Supersedes version in the1996 Professional Products IC Handbook, HB2480 - 3.0 The SP8861 is a low power single chip synthesiser intended for professional radio applications, containing all the elements (apart from the loop amplifier) required to build a PLL frequency synthesis loop The device is serially programmable by a three-wire data highway and contains three independent buffers to store one reference divider word and two local oscillator divider words ...
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... F and F outputs are reversed by the phase detector REF PD sense bit in the F1/F2 programming word. The pin allocations shown are correct when the sense bit is low (see Table 2 and Fig. 7). Fig. 2 SP8861 block diagram V CC 45k CHARGE PUMP 1 DISABLE (SEE TABLE 4) 31 10k ...
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... TYPICAL OVERLOAD 350 300 250 200 GUARANTEED OPERATING 150 WINDOW 4 8/9 MODE 100 150 500 Fig. 4 Typical input characteristics and input drive requirements for SP8861 DATA FIRST DATA BIT CLOCK ENABLE min 50ns min., t ...
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... SP8861 ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following range of operating conditions unless otherwise stated: Supply voltage V = 14·75V to 15·25V Characteristic Supply current Supply current in power down mode Input sensitivity Input overload RF input division ratio Comparison frequency Reference oscillator input frequency ...
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... F1/F2 sense bit Data Entry and Storage a one-bit word in the The data section of the SP8861 consists of a data input interface, a data shift register and three data buffers. Data is entered to the data input interface via a three-wire highway, with DATA (pin 24), CLOCK (pin 15) and ENABLE (pin16) inputs ...
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... SP8861 CONTROL MICRO LOOP AMPLIFIER SP8861 24 Ra 0·25 Ra > 23 PD2 current Fig. 6 Application diagrams 2·2k 15V 0·25 Rb RPD Rb > PD2 current 15V 22 21 33p 20 39p 15V ...
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... PROGRAMMABLE COUNTER (R COUNTER) Fig. 7c Reference word bit allocation F2 WORD BITS CLOCKS DATA LOADS ON FALLING EDGES Fig. 7d Data load sequence Fig. 7 Data format diagrams SP8861 LSB 4-BIT CONTROL PROGRAMMABLE ...
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... SP8861 13·25k 1250 500 500 10 RF INPUT 11 RF INPUT 10k 0·8mA Fig preamplifer inputs 24k 20 21 100 Fig. 8d Oscillator pins EXTERNAL RESISTOR 24 Fig. 8g Charge pump 2 current programming 1250 6k 6k 62·5k 3, 14, 6 37· ...
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... DESCRIPTION A basic application using a single phase detector is shown in Fig. 6a. The SP8861 is a 1·3GHz part so good RF design techniques should be employed, including the use of a ground plane and suitable high frequency capacitors at the RF input and for power supply decoupling. The RF input should be coupled to either pin 10 or pin 11, with the other pin decoupled to ground ...
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... The equivalent voltage gain of the phase detector can be calculated by assuming a value for R in V/radian which would produce the set current. The digital phase detector used in the SP8861 is linear p over a range of 2 radians and therefore the phase detector gain is given by: ...
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... 1·53310 or 0·0153nF 7·687310 or 1·53310 R = 50·242k and R are independent of the other then 3 24 1·318310 0·01318 F 2 SP8861 TO VCO ...
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North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. However, Mitel assumes no liability for errors ...