SP8858
Integrated circuits
Chip capacitors (0805)
SP8858 1·5GHz synthesiser
OP27 Operational amplifier
C11 through C26, C28, C29, C33, C34, C36 through C39,
C41 and C42: 0·1µF
HC00
HC08
HC20
C14: 1nF
C32: 220pF
C40 and C43: 100pF
HC74
C27, C30, C31 and C35: No components
HC165 (6 off)
HC193 (2 off)
Miscellaneous
Murata MQE001-106 VCO
40MHz crystal oscillator
Leaded resistors and capacitors
R1, C4 and C6: Application specific to define the loop filter
characteristic (no components fitted)
R2: 6·8kΩ
C1, C2, C7 and C10: 10µF Tantalum
C3, C5, C8 and C9: 0·1µF Ceramic
1MHz clock oscillator for programmer logic
PCB keyboard switch (SEND)
Slide switches (3 off) (SELECT, F1/F2, POWER DOWN)
16-pin DIL switch (6 off) (SIL a, b, c, d, e and f)
SMA PCB mounting socket (3 off)
Chip resistors (0805)
R3, R12, and R13: 3·3kΩ
R4:10kΩ
R5, R6 and R7: 15Ω
R8: 100Ω
R10: 2·2kΩ
R11: No component
Table 5. Demonstration board parts list
APPENDIX A: SP8853 TO SP8858
REFERENCES
The SP8858 is not a drop-in replacement for the SP8853;
minor modifications will be required to a SP8853-based
design if the SP8858 is to be used in its place. The changes
mainly affect the charge pump output pins as shown in Table
6 below. The SP8858 has only one charge pump output.
In addition the modifications have:
1. Knights P.J., Analysis and Design of a SP8858 Digital PLL
Synthesiser for Low Phase Noise, Proceeding of RF Expo
East 1994, Nov 1994.
2. Gardener F.M., Phaselock Technique, Wiley 1979.
3. Rohde U.L., Digital Frequency Synthesisers Theory and
Design, Prentice Hall 1983.
4. Manassewitsch V., Frequency Synthesisers Theory and
Design, Wiley 1980.
5. Philips C.L. and Harbur R.D., Feedback Control Systems,
Prentice Hall 1991.
6. Scherer D., Learn About Low Noise Design, Microwave
April 1979 p.116.
7. Robins W.P., Phase Noise in Signal Sources, Peter
Peregrineus Ltd. (IEE) 1991.
● Increased the operating frequency range for both the RF
and reference input
● Simplified the lock detect circuit
● Increasedthemaximumcharge-pumpcurrentspecification
to 2mA. Recalculate the loop filter components using
formula in Application section.
PIn No.
SP8853
SP8858
1
Internally connected
NC
8. Breed G.A. (ed.), Frequency Synthesis Handbook, A
Collection from RF Design, Cardiff Publishing Co. May
1992.
9. AN194, The SP8858 Synthesiser: Design for Low Phase
Noise, Mitel Semiconductor
3
PD1 output
PD2 output
NC
NC
CP OUTPUT
CP REF
25
26
Table 6
13
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