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SP8855EKGHCAR

2.8GHz Parallel Load Professional Synthesiser

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SP8855E

2.8GHz Parallel Load Professional Synthesiser

DESCRIPTION

The SP8855E is one of a family of parallel load

synthesisers containing all the elements apart from the

loop amplifier to fabricate a PLL synthesis loop. Other

devices in the series are the SP8852 which is a fully

programmable device requiring two 16 bit words to set

the RF and reference counters, and the SP8854 which

has hard wired reference counter programming and

requires a single bit word to program the RF divider.

The SP8855E is intended for applications where a fixed

synthesiser frequency is required although it can also

be used where frequency selection is set by switches.

In general the device will be programmed by

connecting the programming pins to either V or

CC

ground. Additional hard wired inputs can be used to

control the F and F outputs set the control direction

pd

ref

of the loop and select the phase detector gain. Another

input may be used to disable the phase detector output.

The device is available in ceramic J-leaded 44-lead

chip carrier. Ambient temperature ranges available are

shown in the ordering information.

Pin Description

1 Input bus bit 10

2 Input bus bit 9

3 Input bus bit 8

4 Input bus bit 7

5 Input bus bit 6

6 Input bus bit 5

7 Input bus bit 4

8 Input bus bit 3

9 Input bus bit 2

10 Input bus bit 1

11 Input bus bit 0

12 0V (prescaler)

13 RF input

14 RF input

15 VCC + 5V (prescaler)

16 VEE 0V

17 Lock detect output

18 C-lock detect

19 Rset

20 Charge pump output

21 Charge pump ref.

22 Fref/Fpd enable

Pin Description

23 Control Direction

24 Fpd*

25 Fref*

26 +5V

27 Ref. osc capacitor

28 Ref in/XTAL

29 Reference bit 9

30 Reference bit 8

31 Reference bit 7

32 Reference bit 6

33 Reference bit 5

34 Reference bit 4

35 Reference bit 3

36 Reference bit 2

37 Reference bit 1

38 Reference bit 0

39 Phase Detect Enable

40 Phase Detect Gain 1

41 Phase Detect Gain 0

42 Input bus bit 13

43 Input bus bit 12

44 Input bus bit 11

*Fpd and Fref outputs are reversed using the Control Direction

input. The table above is correct when pin 23 is high.

Data Sheet 291297 issue 3 Nov-11

Ordering Information

SP8855E/KG/HCAR (in trays)

-55°C to +100°C 44J-lead Ceramic Chip Carrier

SP8855E/IG/HCAR (in trays)

-40°C to +85°C 44J-lead Ceramic Chip Carrier

EQUIVALENT PARTS: PS20855

FEATURES

• 2.8GHz Operating Frequency (IG GRADE)

• Single 5V Supply Operation

• High Comparison Frequency 50MHz

• High Gain Phase Detector 1mA/rad

• Programmable Phase Detector Gain

• Zero "Dead Band" Phase Detector

• Wide range of RF and Reference Divide

Ratios

• Programming by Hard Wired Inputs

• Low cost plastic package option

Figure 1 - Pin connections - top view

HC

ABSOLUTE MAXIMUM RATINGS

Supply voltage

-0.3V to 6V

Storage temperature

-65 °C to +150°C

Operating temperature -55°C to +100°C

Prescaler & reference Input Voltage 2.5V p-p

Data Inputs

VCC +0.3V

VEE -0.3V

Junction temperature +175°C (HC package)

Data Sheet 291297 issue 3

1

Plessey Semiconductors Ltd.

Design & Technology Centre, Delta 500, Delta Business Park, Great Western Way, Swindon, UK SN5 7XE

Tel: +44 1793 518000

Fax: +44 1793 518030

Web: www.plesseysemi.com

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