Datasheet > EVB7108

EVB7108

更新时间： 2022-01-18 23:50:00

品牌	Logo	应用领域
其他 - ETC		/
页数	文件大小	规格书
8页	257K
描述
EVB7108 EValuation Board for TH7108

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EVB7108 数据手册

EVB7108

868/915MHz Transmitter

Evaluation Board Description

Board Component Values

Value

868.3 MHz

Value

915 MHz

Part

Size

Tolerance

Description

CF1

CF2

CX1_{_FSK}

CX1_{_ASK}

CX2

CX3

0805

0603

1206

0805

0603

1206

0603

0805

SOD323

HC49/S

5.6 nF

27 pF

56 pF

18 pF

1 nF

4.7 nF

27 pF

56 pF

18 pF

1 nF

loop filter capacitor

±10%

±5%

XOSC capacitor for FSK (∆f = ±30 kHz)

XOSC capacitor for ASK, trimmed to f_C

XOSC capacitor, only needed for FSK

XOSC capacitor, only needed for FM

antenna resonance capacitor

blocking capacitor

±5%

1 nF

±10%

±2%

2.2 pF

1.2 pF

330 pF

220 nF

150 nH

1.6 kΩ

2.0 kΩ

47 kΩ

470 kΩ

30 kΩ

0 Ω

2.2 pF

1 pF

±2%

330 pF

220 nF

150 nH

1.6 kΩ

2.0 kΩ

47 kΩ

470 kΩ

30 kΩ

0 Ω

±10%

±20%

±10%

blocking capacitor

biasing inductor

RF1

RF2

RPS

loop filter resistor

power-select resistor

optional pull-up resistor, typically not needed

varactor bias resistor, only needed for FM

ASK jumper, only needed for ASK

varactor diode, only needed for FM

BB535

XTAL

27.1344 MHz 28.5938 MHz

crystal, C_load= 12 pF to 15 pF, C_{0, max}= 7 pF,

±30ppm

fundamental

wave

fundamental

wave

calibration

R_{m, max}= 40 Ω

±30ppm

temp.

PCB

loop

antenna

long side

length

18 mm

9 mm

2 mm

18 mm

9 mm

2 mm

on FR4 PCB material

side length including length of C1 and C2

PCB

loop

antenna

small side

length

on FR4 PCB material

PCB

loop

Line width

antenna

The listed component values are default values. All values might be changed to fit to any specific application.

As for example FSK deviation can be set by varying CX1 and CX2, output power at FSK/FM transmission

can be changed through RPS or through RPS and R3 at ASK transmission, respectively.

Pads for C1 are for population of a fixed-value capacitor with size 1206 or a to use trimming capacitor either.

390120710801

Rev. 007

6 of 8

EVB Description

Aug/02

1...3 4 567 8

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