SP8853B Mitel, SP8853B Datasheet
SP8853B
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SP8853B Summary of contents
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Supersedes March 1997 version, DS2352 - 3.0 The SP8853 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 ...
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SP8853A INPUT 16/17 OR 8/9 11 CONTROL RF INPUT LOGIC 13 F1/F2 14 DATA 15 DATA 2-BIT CLOCK INPUT SR 16 ENABLE POWER 6 DOWN REFERENCE 20 21 CRYSTAL PD1 3 CHARGE PUMP 1 CHARGE PUMP 2 f ...
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TYPICAL OVERLOAD 350 300 250 200 GUARANTEED GUARANTEED OPERATING 150 WINDOW 4 8/9 MODE 4 100 150 500 Fig. 4 Typical input characteristics and input drive requirements for SP8853 A and ...
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SP8853A/B 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 ...
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DESCRIPTION Prescaler and AM Counter The programmable divider chain counter design and therefore contains a dual modulus front end prescaler counter which controls the dual modulus ratio and an M counter which controls the bulk ...
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SP8853A update cycle will consist of a byte containing 24 bits whereas the reference byte will contain 18 bits. The device requires 3 bytes, each with a chip select sequence, totalling 66 bits to fully program. ...
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PHASE DETECTOR GAIN CONTROL (SEE TABLE 1) MSB 15-BIT PROGRAMMABLE COUNTER (M COUNTER) PHASE DETECTOR SENSE BIT (SEE TABLE 2) Fig word, bit allocation ...
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SP8853A/B 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 ...
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DESCRIPTION A basic application using a single phase detector is shown in Fig. 6a. The SP8853 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 ...
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SP8853A FROM PHASE DETECTOR Fig. 9 Standard form of second order loop filter LOOP CALCULATIONS Many frequency synthesiser designs use a second order loop with a loop filter of the form shown in Fig practice, ...
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C1 R1 FROM CHARGE PUMP Fig. 11 Standard form of third order loop filter where and v are as defined for the second order loop and F is the phase margin, normally ...
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... Mitel. This publication is issued to provide information only and (unless agreed by Mitel in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. The products, their specifications, services and other information appearing in this publication are subject to change by Mitel without notice. No warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. Information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specifi ...