Datasheet > SP5669KG

SP5669KG

更新时间： 2024-10-31 22:20:03

品牌	Logo	应用领域
MITEL		/
页数	文件大小	规格书
15页	240K
描述
2.7GHz I2C Bus Controlled Synthesiser

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SP5669KG 数据手册

SP5669

2.7GHz I²C Bus Controlled Synthesiser

Preliminary Information

DS4852 -

Issue 2.1

May 1999

Features

Ordering Information

●

Complete 2.7GHz single chip system

Compatible with UK DTT offset requirements

Optimised for low phase noise

Selectable divide by two prescaler

Selectable reference division ratio

Selectable reference/comparison frequency output

Selectable charge pump current

SP5669/KG/MP1S (Tubes)

SP5669/KG/MP1T (Tape and reel)

Four selectable I²C bus address

5–level ADC

Pin compatible with the SP5658 3–wire bus

controlled synthesiser and SP5659 I²C bus

synthesiser and SP5659 I²C bus synthesiser

ESD protection; (Normal ESD handling

procedures should be observed)

The comparison frequency is obtained either from an

on–chip crystal controlled oscillator, or from an external

source. The oscillator frequency F_refor the comparison

frequency F_compmay be switched to the REF/COMP

output. This feature is ideally suited to providing the

referencefrequencyforasecondsynthesisersuchasin

a double conversion tuner (see Fig. 8).

The synthesiser is controlled via an I ²C bus, and

respondstooneoffourprogrammableaddresseswhich

are selected by applying a specific voltage to the

‘address’ input. This feature enables two or more

synthesisers to be used in a system.

Applications

●

Complete 2.7GHz single chip system

Optimised for low phase noise

The device contains four switching ports P0–P3 and a

Description

5–level ADC. The output of the ADC can be read via the

I ²C

bus.

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 device also contains a varactor line disable and

chargepump disable facility.

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.

12 3 4 5 6 7...15

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