SP8858IGHPAS datasheet(13/17 Pages) MITEL

13 / 17 page

SP8858

Integrated circuits

SP8858 1·5GHz synthesiser

OP27 Operational amplifier

HC00

HC08

HC20

HC74

HC165 (6 off)

HC193 (2 off)

Leaded resistors and capacitors

R1, C4 and C6: Application specific to define the loop filter

characteristic (no components fitted)

R2: 6·8k

Ω

C1, C2, C7 and C10: 10

µF Tantalum

C3, C5, C8 and C9: 0·1

µF Ceramic

Chip resistors (0805)

R3, R12, and R13: 3·3k

Ω

R4:10k

Ω

R5, R6 and R7: 15

Ω

R8: 100

Ω

R10: 2·2k

Ω

R11: No component

Chip capacitors (0805)

C11 through C26, C28, C29, C33, C34, C36 through C39,

C41 and C42: 0·1

µF

C14: 1nF

C32: 220pF

C40 and C43: 100pF

C27, C30, C31 and C35: No components

Miscellaneous

Murata MQE001-106 VCO

40MHz crystal oscillator

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)

Table 5. Demonstration board parts list

APPENDIX A: SP8853 TO SP8858

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:

Increased the operating frequency range for both the RF

and reference input

Simplified the lock detect circuit

Increased the maximum charge-pump current specification

to 2mA. Recalculate the loop filter components using

formula in Application section.

PIn No.

SP8853

Internally connected

PD1 output

PD2 output

SP8858

CP OUTPUT

CP REF

Table 6

REFERENCES

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.

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

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