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SP8861

1·3GHz Low Power Single-Chip Frequency Synthesiser

Mitel Networks 

SP8861

1·3GHz Low Power Single-Chip Frequency Synthesiser

Supersedes version in the1996 Professional Products IC Handbook, HB2480 - 3.0

DS3640 - 4.0 April 1998

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.

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.

A power down mode is incorporated as a battery economy

feature.

FEATURES

s Improved Digital Phase Detector Eliminates

‘Dead Band’ Effects

s Low Operating Power, Typically 175mW

s 1·3GHz Operating Frequency

s Complete Phase Locked Loop

s High Input Sensitivity

s Programmed throughThree-Wire Bus

s Wide Range of Reference Division Ratios

s Local Storage for Two Frequency Words, giving

Rapid Frequency Toggling

s Programmable Phase Detector Gain

s Power Down Mode

FREF*

POWER DOWN

VEE4

VCC4

VCC1

RF INPUT

RF INPUT

4 3 2 1 28 27 26

5

25

6

24

7

23

8

SP8861

22

9

21

10

20

11

19

12 13 14 15 16 17 18

PD2 OUTPUT

RPD

VCC3

GROUND

XTAL 1

XTAL2

VEE2

HP28

*FPD and FREF outputs are reversed by the phase

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.

VCC1, VEE1 – preamplifier and prescaler supplies

VCC2, VEE2 – oscillator supplies

VCC3, VEE3 – charge pump 2 supplies

VCC4, VEE4 – ECL supplies

Fig. 1 Pin identification diagram (top view)

ABSOLUTE MAXIMUM RATINGS

Supply voltage

Storage temperature

Operating temperature

Prescaler input voltage

20·3V to 17V

255°C to 1150°C

240°C to 185°C

2·5V p-p

ORDERING INFORMATION

SP8861/NA/HP

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