View FSD270TA_1242873.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

FSD270
SILICON DUAL VARIABLE CAPACITANCE DIODE
SUMMARY VBR=25V; IR=20nA; Cd=33pF(Nom) 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
* Common Cathode dual Diode ( monolithic construction ) * * * *
VHF- UHF operation Close tolerance CV characteristics High Tuning Ratio Low IR , enabling excellent Phase Noise Performance ( IR typically < 200pA @ 20V )
PIN CONFIGURATION
1
* High Q
2
3
APPLICATIONS
* DAB Receiver Modules for use with:
-Low voltage battery portables -Hi-Fi -In car radio -MP3 players
C1 C2
Top View
A1
* Voltage and Temperature Controlled Crystal Oscillators * Mobile Radio and Pagers.
A2
ORDERING INFORMATION
DEVICE FSD270TA REEL SIZE 7 (180mm) TAPE WIDTH 8mm embossed QUANTITY PER REEL 3000 units
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 1
FSD270
ABSOLUTE MAXIMUM RATINGS.
PARAMETER Forward Current (single diode) Power Dissipation at T amb =25C (a) Linear Derating Factor Operating and Storage Temperature Range SYMBOL IF PD T j :T stg VALUE 200 330 3 -55 to +150 UNIT mA mW mW/C 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 Tamb = 25C ).
PARAMETER Reverse Breakdown Voltage Reverse Leakage Current Temperature Coefficient Diode Capacitance Capacitance Ratio Figure of Merit SYMBOL V BR MIN. 25 TYP. MAX. UNIT V CONDITIONS. I R = 10A V R = 20V V R = 3V, f=1MHz V R = 2V, f=1MHz V R = 2V/20V, f=1MHz V R = 3V, f=50MHz
IR Cd Cd / Cd Q 29.7 5.0 200
0.2
20 400
nA ppm/C pF
33.0
36.3 6.5
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. BAND A BAND B BAND C 29.7 31.9 33.9
MAX. 32.1 34.1 36.3
UNIT pF pF pF
PART NUMBER 70A 70B 70C
ISSUE 1 - AUGUST 2002 2
FSD270
APPLICATIONS INFORMATION FSD270 in Digital Audio Broadcasting (DAB) Circuits
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. 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.
Figure 1.
ISSUE 1 - AUGUST 2002 3
FSD270
CHARACTERISTICS
ISSUE 1 - AUGUST 2002 4
FSD270
PACKAGE OUTLINE PAD LAYOUT DETAILS
PACKAGE DIMENSIONS
DIM Millimetres Min A B C D F G K L N 2.67 1.20 - 0.37 0.085 Max 3.05 1.40 1.10 0.53 0.15 Inches Min 0.105 0.047 - 0.0145 0.0033 Max 0.120 0.055 0.043 0.021 0.0059
NOM 1.9 0.01 2.10 0.10 2.50
N
NOM 0.075 0.0004 0.0825 0.004 0.0985
NOM 0.95
NOM 0.037
(c) Zetex plc 2002
Europe Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 uk.sales@zetex.com Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 europe.sales@zetex.com Americas Zetex Inc 700 Veterans Memorial Hwy Hauppauge, NY11788 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 usa.sales@zetex.com Asia Pacific Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong Hong Kong 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 5

▲Up To Search▲

Price & Availability of FSD270TA

	To Download FSD270TA Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .