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TRF2020

更新时间： 2024-11-20 22:19:11

品牌	Logo	应用领域
德州仪器 - TI		移动电话 GSM 蜂窝通信
页数	文件大小	规格书
26页	399K
描述
SYNTHESIZER FOR GLOBAL SYSTEM FOR MOBILE GSM CELLULAR TELEPHONES

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TRF2020 数据手册

TRF2020

SYNTHESIZER FOR GLOBAL SYSTEM

FOR MOBILE (GSM) CELLULAR TELEPHONES

SLWS020B – FEBRUARY 1995 – REVISED JANUARY 1998

PW PACKAGE

(TOP VIEW)

Three Separate Loops: 1 UHF and 2 VHF

Operation to 1.2-GHz for Main Synthesizer

Operation to 250 MHz for Auxiliary

Synthesizers

AUX1_IN

CLOCK

DATA

STROBE

DDP1

PDA1

SW1

RPA

Fast Lock-up Time

High-Speed Serial Data Bus

Low Power Consumption

DDA

REF_IN

SWM

PDM

Ideal for Global Systems for Mobile

Communications (GSM) Applications

SSP

PDA2

SW2

SSA

RPM

description

DDP2

AUX2_IN

DDPM

The Texas Instruments (TI ) TRF2020 is an

integrated high performance frequency synthe-

sizer device. The TRF2020 consists of one main

1.2-GHz synthesizer and two auxiliary 250-MHz

RF_IN

synthesizers. Each synthesizer has an independent dual-modulus prescaler and separate powerdown modes.

These features provide maximum flexibility for the design of 900-MHz wireless systems.

The main synthesizer consists of a 32/33-modulus prescaler with an 11-bit counter, a phase-frequency detector,

and a charge pump. The phase-frequency detector is referenced to an internal reference frequency that is

derived from an external TCXO signal. The phase-frequency detector is also provided with a dead-zone

compensation circuit that reduces synthesizer phase noise during locked conditions.

Each auxiliary synthesizer consists of an independent 8/9-modulus prescaler with an 11-bit counter, a

phase-frequency detector, and a charge pump. Similar to the main synthesizer, each auxiliary synthesizer’s

phase-frequency detector is referenced to an internal reference frequency that is derived from an external

TCXO signal.

The external TCXO signal is prescaled by an 11-bit counter and then distributed to three independent

postscalers. Each postscaler provides a selectable, divide-by-1, -2, -4, or -8 function before the reference signal

is distributed to the associated synthesizer phase detector. The reference frequency prescaler and independent

postscalers are software programmable.

To achieve minimum lock-up time, each synthesizer contains a speed-up mode charge pump capable of

providing 2 mA output current and an analog switch that can change the loop-filter time constant. The duration

of the speed-up mode operations can be independently controlled with software.

Thestatesofthethreeinternallockdetectorsareprovidedonaprogrammable, combinationallogicoutput;each

synthesizer can be selected independently or ANDed together.

The device is programmed over a three-wire, synchronous, serial data bus (clock, data, strobe) with achievable

bit rates as high as 20 Mbits/sec. The data is partitioned into words in such a manner that static parameters may

be sent once during initialization, and dynamic parameters, such as frequency, may be sent as often as needed.

The TRF2020 is offered in a 24-pin plastic thin-shrink small-outline package (TSSOP) and is characterized for

free-air operation from –40°C to 85°C.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

TI is a trademark of Texas Instruments Incorporated.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

12 3 4 5 6 7...26

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与TRF2020相关器件

型号	品牌	获取价格	描述	数据表
TRF2020PW	TI	获取价格	SYNTHESIZER FOR GLOBAL SYSTEM FOR MOBILE GSM CELLULAR TELEPHONES
TRF20226J050A	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 50V, 22uF, THROUGH HOLE MOUNT, RADIAL LEADED
TRF20226J050B	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 50V, 22uF, THROUGH HOLE MOUNT, RADIAL LEADED
TRF20226K050B	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 50V, 22uF, THROUGH HOLE MOUNT, RADIAL LEADED
TRF20-226-K050BW	RCD	获取价格	Tantalum Capacitor, Polarized, Tantalum (wet), 50V, 10% +Tol, 10% -Tol, 22uF, Through Hole
TRF20226M050A	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 50V, 22uF, THROUGH HOLE MOUNT, RADIAL LEADED
TRF20-226-M050AW	RCD	获取价格	Tantalum Capacitor, Polarized, Tantalum (wet), 50V, 20% +Tol, 20% -Tol, 22uF, Through Hole
TRF20226M050B	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 50V, 22uF, THROUGH HOLE MOUNT, RADIAL LEADED
TRF20-226-M050BW	RCD	获取价格	Tantalum Capacitor, Polarized, Tantalum (wet), 50V, 20% +Tol, 20% -Tol, 22uF, Through Hole
TRF20227J010A	RCD	获取价格	CAPACITOR, TANTALUM, SOLID, POLARIZED, 10V, 220uF, THROUGH HOLE MOUNT, RADIAL LEADED

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