ORDERING INFORMATION

SP5669/KG/MP1S (Tubes)

SP5669/KG/MP1T (Tape and reel)

The SP5669 is a single chip frequency synthesiser

designed for tuning systems up to 2.7GHz and offers step size

compatible with DTT offset requirements.

The RF preamplifier drives a divide by two prescaler which

can be disabled for applications up to 2GHz, allowing direct

interfacing with the programmable divider so enabling a step

size equal to the comparison frequency. For applications up to

2.7GHz the divide by two is enabled, giving a step size of twice

the comparison frequency.

The comparison frequency is obtained either from an on–

chip crystal controlled oscillator, or from an external source.

The oscillator frequency F

F

is ideally suited to providing the reference frequency for a

second synthesiser such as in a double conversion tuner (see

Fig. 8).

to one of four programmable addresses which are selected by

applying a specific voltage to the ‘address’ input. This feature

enables two or more synthesisers to be used in a system.

The device contains four switching ports P0–P3 and a

bus.

The device also contains a varactor line disable and charge

pump disable facility.

Fig.1 Pin connections - top view

FEATURES

s

Complete 2.7GHz single chip system

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Compatible with UK DTT offset requirements

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Optimised for low phase noise

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Selectable divide by two prescaler

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Selectable reference division ratio

s

Selectable reference/comparison frequency output

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Selectable charge pump current

s

s

5–level ADC

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Pin compatible with the SP5658 3–wire bus

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ESD protection; (Normal ESD handling

procedures should be observed)

APPLICATIONS

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SAT, TV, VCR and Cable tuning systems

116

1

MP16

CHARGE PUMP

CRYSTAL

REF/COMP

ADDRESS

SDA

SCL

PORT P3

PORT P2

DRIVE

Vee

RF INPUT

RF INPUT

Vcc

ADC

PORT P0

PORT P1

2

3

4

5

6

7

89

10

11

12

13

14

15

APPLICATIONS

s

Complete 2.7GHz single chip system

s

Optimised for low phase noise

SP5669

Preliminary Information

DS4852 - 1.4 November 1997