NXP Semiconductors AN10714, Application Note

Page: 8 / 21

AN10714_1 © NXP B.V. 2010. All rights reserved.
Application note Rev. 01 — 26 January 2010 8 of 21
NXP Semiconductors
AN10714
Using the BLF574 in the 88 MHz to 108 MHz FM band
[1] The semirigid cable length is defined in Figure 4 .
[2] Contact your local NXP Semiconductors sales person for the artwork file containing the dimensions.
[3] N-male connector mounted as close to the package as possible.
Q1 7808 voltage regulator NJM#78L08UA-ND NJR
Q2 SMT 2222 NPN transistor PMBT2222 NXP Semiconductors
Q3 600 W LDMOST BLF574 NXP Semiconductors
R1 200
Ω
potentiometer 3214W-1-201E Bourns
R2, R3 432
Ω
resistor CRCW0805432RFKEA Vishay Dale
R4 2 k
Ω
resistor CRCW08052K00FKTA Vishay Dale
R5 75
Ω
resistor CRCW080575R0FKTA Vishay Dale
R6 not connected - -
R7, R9 1.1 k
Ω
resistor CRCW08051K10FKEA Vishay Dale
R10 11 k
Ω
resistor CRCW080511K0FKEA Vishay Dale
R11 5.1
Ω
resistor CRCW08055R1FKEA Vishay Dale
R12 499
Ω
/0.25 W resistor CRCW2010499RFKEF Vishay Dale
R13, R16 9.1
Ω
resistor CRCW08059R09FKEA Vishay Dale
R14 5.1 k
Ω
resistor CRCW08055K10FKTA Vishay Dale
R15 910
Ω
resistor CRCW0805909RFKTA Vishay Dale
T1, T2 63.5 mm (2.5 ”)/25
Ω
semirigid through
ferrite
[1]
ferrite: BN-61-202 Amidon
semirigid: 047-25 Micro-Coax
T3, T4 coax cable 86.36 mm (3.4 ”)/25
Ω
;
ID = 2.18 mm (0.086 ")
E22[1]STJ Thermax
Table 1. Bill of materials for the BLF574 input and output circuits
…continued
PCB material: Taconic RF35;
ε
r
= 3.5; thickness 0.76 mm (30 mil). Figure 3 shows the BLF574 PCB layout.
Designator Description Part number Manufacturer
Fig 4. Cable length definition
001aak524
semirigid cable length