Datasheet > SP5848QP1T

SP5848QP1T

更新时间： 2024-10-31 22:25:03

品牌	Logo	应用领域
MITEL		/
页数	文件大小	规格书
9页	70K
描述
2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL

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SP5848QP1T 数据手册

Preliminary Information

SP5848

2.2/1.3GHz 3-Wire Bus Dual Low Phase Noise PLL

Preliminary Information

DS5076

Issue 1.6

October 1999

Features

Ordering Information

G Dual independent PLL frequency synthesisers in a

single package, optimised for double conversion

cable tuners, offering improved application

SP5848/KG/QP1S

SP5848/KG/QP1T

G 2.2GHz up-synthesiser optimised for low phase

noise up to comparison frequencies of 4MHz

Description

G 1.3GHz down-synthesiser optimised for low phase

noise AND small step size

The SP5848 is a dual PLL frequency synthesizer

controlled by a 3-wire bus optimised for application in

double conversion tuners.

G Common reference oscillator and divider with

independently selectable ratios for each

synthesiser

G 10:1 programmable charge pump current ratio in up

synthesiser

G 3-Wire bus programmable, each synthesiser

Each synthesiser loop within the SP5848 is

independently addressable and contains an RF

programmable divider, phase/frequency detector and

charge pump/loop amplifier section; a common

reference frequency oscillator and divider chain is

provided, whose ratios for each loop are independently

programmable.

indepently addressable

G Low power consumption, typ 100mW at 5V

G ESD protection, (Normal ESD handling procedures

should be observed)

Both synthesisers are optimised for low phase noise

performance and in addition synthesiser 2 is capable of

operation with a low comparison frequency.

Applications

G TV, VCR, and cable tuning systems

PUMP 1

DRIVE 1

11 BIT

COUNT

RF1 INPUT

16/17

4 BIT

COUNT

PORT P0

15 BIT LATCH

2 BIT

LATCH

2 BIT

LATCH

PORT P1

DATA

INTERFACE

CLOCK

5 BIT

LATCH

2⁹

DIVIDE

ENABLE

1 BIT

LATCH

16 BIT LATCH

PUMP 2

DRIVE 2

12 BIT

COUNT

16/17

4 BIT

RF 2 INPUT

COUNT

Figure 1 Block Diagram

12 3 4 5 6 7...9

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