SP8853B Mitel, SP8853B Datasheet

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SP8853B

Manufacturer Part Number
SP8853B
Description
175mW; 1.3GHz professional synthesiser
Manufacturer
Mitel
Datasheet

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SP8853B
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Supersedes March 1997 version, DS2352 - 3.0
intended for professional radio applications, containing all the
elements (apart from the loop amplifier) required to build a PLL
frequency synthesis loop
highway and contains three independent buffers to store one
reference divider word and two local oscillator divider words.
A digital phase detector with two charge pumps,
programmable in phase and gain, are provided to improve
lock-up performance. The preset operation of the charge
pumps can be overwritten or the comparison frequencies
switched to output ports under control of the divider word. The
dual modulus ratio and so operating range is also
programmable through the same word.
feature.
grade) and 240 C to185 C (B grade).
FEATURES
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Storage temperature
Prescaler input voltage
The SP8853 is a low power single chip synthesiser
The device is serially programmable by a three-wire data
A power down mode is incorporated as a battery economy
The SP8853 is specified at 1·3GHz at 255 C to1125 C (A
Improved Digital Phase Detector Eliminates
‘Dead Band’ Effects
Low Operating Power, Typically 175mW
1·3GHz Operating Frequency
Complete Phase Locked Loop
High Input Sensitivity
Programmed throughThree-Wire Bus
Wide Range of Reference Division Ratios
Local Storage for Two Frequency Words, giving
Rapid Frequency Toggling
Programmable Phase Detector Gain
Power Down Mode
255 C to 1150 C
20·3V to 17V
2·5V p-p
ORDERING INFORMATION
SP8853/A/HC Military temperature range
SP8853/B/HC Industrial temperature range
*F
detector sense bit in the F1/F2 programming word. The
above diagram is correct when the sense bit is low. See
Table 2 and Fig. 7.
V
V
V
V
POWER DOWN
CC
CC
CC
CC
PD
1·3GHz Professional Synthesiser
1, V
2, V
3, V
4, V
RF INPUT
RF INPUT
and F
Fig. 1 Pin identification diagram (top view)
F
EE
EE
EE
EE
V
V
V
REF
CC
CC
EE
1 – preamplifier and prescaler supplies
2 – oscillator supplies
3 – charge pump 2 supplies
4 – ECL supplies
4
4
1
*
REF
5
6
7
8
9
10
11
outputs are reversed by the phase
12
4
13
3
SP8853
14
2
15
1
28
16
27 26
17 18
SP8853A/B
DS2352 - 4.0 March 1998
25
24
23
22
21
20
19
PD2 OUTPUT
RPD
V
GROUND
XTAL 1
XTAL2
V
CC
EE
2
3
HC28

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SP8853B Summary of contents

Page 1

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 ...

Page 2

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 ...

Page 3

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 ...

Page 4

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 ...

Page 5

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 ...

Page 6

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. ...

Page 7

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 ...

Page 8

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 ...

Page 9

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 ...

Page 10

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, ...

Page 11

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 ...

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