FSD270 [ZETEX]

SILICON DUAL VARIABLE CAPACITANCE DIODE; 硅双变容二极管


型号：	FSD270
厂家：	ZETEX SEMICONDUCTORS
描述：	SILICON DUAL VARIABLE CAPACITANCE DIODE 硅双变容二极管二极管变容二极管
文件：	总5页 (文件大小：159K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FSD270

SILICON DUAL VARIABLE CAPACITANCE DIODE

SUMMARY

=25V; I =20nA; C =33pF(Nom)

R d

DESCRIPTION

The FSD270 is a new hyperabrupt SOT23 packaged dual common cathode varactor

diode , offering users both compact circuit design and impressive performance

comprising tightly controlled CV characteristics, a capacitance of typically 33 pf @

2V,excellent phase noise performance and high Q of 200 min.

This superior performance in the VHF and UHF ranges has been optimised to meet

the high filtering requirements of a wide range of Digital Audio Broadcasting (DAB)

module circuits , mobile radios, pagers, voltage controlled crystal oscillators

(VCXO) and temperature controlled crystal oscillators (TCXO).

SOT23

FEATURES

PIN CONFIGURATION

•

Common Cathode dual Diode ( monolithic construction )

•

VHF- UHF operation

Close tolerance CV characteristics

High Tuning Ratio

Low I_R, enabling excellent Phase Noise

Performance ( I_Rtypically < 200pA @ 20V )

•

High Q

APPLICATIONS

•

DAB Receiver Modules for use with:

-Low voltage battery portables

-Hi-Fi

-In car radio

-MP3 players

•

Voltage and Temperature Controlled Crystal Oscillators

Mobile Radio and Pagers.

Top View

ORDERING INFORMATION

DEVICE

REEL SIZE

TAPE WIDTH

QUANTITY PER REEL

3000 units

FSD270TA

7ЈЈ (180mm)

8mm embossed

The FSD270 is capacitance selected into 3 bands. A reel will only contain one band - A,B or C. Shipments of more

than 1 reel may contain reels from different bands.

ISSUE 1 - AUGUST 2002

FSD270

ABSOLUTE MAXIMUM RATINGS.

PARAMETER

SYMBOL

VALUE

200

UNIT

Forward Current (single diode)

I_F

Power Dissipation at T_amb=25°C (a)

Linear Derating Factor

P_D

330

mW/°C

Operating and Storage Temperature Range

T_j:T_stg

-55 to +150

°C

NOTES

(a) For a device surface mounted on 25mm x 25mm FR4 PCB with high coverage of single sided 1oz copper,

in still air conditions

ELECTRICAL CHARACTERISTICS (at T

= 25°C ).

amb

PARAMETER

SYMBOL MIN.

TYP.

MAX.

UNIT

CONDITIONS.

Reverse Breakdown

Voltage

V_BR

I_R= 10µA

Reverse Leakage Current

Temperature Coefficient

Diode Capacitance

Capacitance Ratio

I_R

0.2

V_R= 20V

400

36.3

6.5

ppm/°C V_R= 3V, f=1MHz

C_d

29.7

5.0

33.0

V_R= 2V, f=1MHz

C_d/ C_d

V_R= 2V/20V, f=1MHz

V_R= 3V, f=50MHz

Figure of Merit

200

Additional CV matching capability:

Zetex recognise that some applications ie filtering in digital audio receiver circuits, require these dual varactors

to be very tightly matched. To meet this requirement devices can be supplied tested into capacitance bands at the

2V condition.

Each ( TA ) reel will contain 3000 devices carrying only diodes tested into a single band and each device will have a

partmark identifying the capacitance band which they meet.

As this is a final test measurement customers will not have the option to specify a capacitance at the time of

ordering and will be obliged to accept the band into which the devices are tested.

- Purchase orders can be placed in multiples of 3000 units / reel for device type FSD270TA

- Samples can be obtained from Zetex Plc quoting device type #FSD270TA

MIN.

29.7

31.9

33.9

MAX.

32.1

34.1

36.3

UNIT

PART NUMBER

BAND A

BAND B

BAND C

70A

70B

70C

ISSUE 1 - AUGUST 2002

FSD270

APPLICATIONS INFORMATION

FSD270 in Digital Audio Broadcasting (DAB)

Circuits

Most textbook circuits show a single variable

capacitance diode in place of the FSD270. In practice

radio frequency oscillations in the tracking filters can

drive the single diode into conduction on peaks

increasing the bias voltage and giving rise to

undesirable harmonics. Common-cathode variable

capacitance diodes are used to overcome this problem.

The FSD270 dual common cathode device in the space

saving SOT23 package has been optimized for this

application. Zetex application note AN9 covers our

range of variable capacitance diodes and their

applications in detail.

Digital audio is set to dominate car radio and other

mobile radio applications. Most of the required

functions can be achieved with a single integrated

circuit. One parts of the circuit that are not integrated

are the Voltage Controlled Oscillator (VCO) used in the

Phase-Locked Loop (PLL) channel selection circuit and

the tracking filters. Figure 1 shows the FSD270 dual

variable capacitance diode (also known as varactor or

tuner diode) in a DAB application.

Figure 1.

ISSUE 1 - AUGUST 2002

FSD270

CHARACTERISTICS

ISSUE 1 - AUGUST 2002

FSD270

PACKAGE OUTLINE

PAD LAYOUT DETAILS

PACKAGE DIMENSIONS

DIM

Millimetres

Inches

Min

2.67

1.20

–

Max

0.120

0.055

0.043

3.05

1.40

1.10

0.53

0.15

0.105

0.047

–

0.37

0.085

0.0145 0.021

0.0033 0.0059

NOM 0.075

NOM 1.9

0.01

2.10

0.10

2.50

0.0004 0.004

0.0825 0.0985

NOM 0.037

NOM 0.95

Europe

Americas

Asia Pacific

Zetex plc

Fields New Road

Chadderton

Oldham, OL9 8NP

United Kingdom

Zetex GmbH

Streitfeldstraße 19

D-81673 München

Zetex Inc

700 Veterans Memorial Hwy

Hauppauge, NY11788

Zetex (Asia) Ltd

3701-04 Metroplaza, Tower 1

Hing Fong Road

Kwai Fong

Hong Kong

Germany

USA

Telephone (44) 161 622 4422

Fax: (44) 161 622 4420

uk.sales@zetex.com

Telefon: (49) 89 45 49 49 0

Fax: (49) 89 45 49 49 49

europe.sales@zetex.com

Telephone: (631) 360 2222

Fax: (631) 360 8222

usa.sales@zetex.com

Telephone: (852) 26100 611

Fax: (852) 24250 494

asia.sales@zetex.com

These offices are supported by agents and distributors in major countries world-wide.

This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced

for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company

reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service.

For the latest product information, log on to www.zetex.com

ISSUE 1 - AUGUST 2002

相关型号：