EVB7107B-315-FSK-C

EVB7107B-315-FSK-C Datasheet

EVB7107

Part	Datasheet
EVB7107B-315-FSK-C	EVB7107B-315-FSK-C (pdf)

Related Parts	Information
EVB7107B-433-FSK-C	EVB7107B-433-FSK-C

PDF Datasheet Preview
EVB7107 315/433MHz Transmitter Evaluation Board Description ! Fully integrated, PLL-stabilized VCO ! Frequency range from 310 MHz to 440 MHz ! FSK through crystal pulling allows modulation from DC to 40 kbit/s ! High FSK deviation possible for wideband data transmission ! ASK achieved by on/off keying of internal power amplifier ! FM possible with external varactor ! Wide power supply range from V to V ! High over-all frequency accuracy ! Very low standby current ! Adjustable equivalent radiated power ERP range from -25 dBm to -10 dBm ! Adjustable current consumption from mA to mA ! FSK deviation and center frequency independently adjustable ! Differential output well-suited for loop antenna ! External clock available for µC drive, down to V supply ! ”Clock only” mode ! Conforms to EN 300 220 and similar standards Ordering Information Part No. EVB7107-433-FSK EVB7107-433-ASK EVB7107-315-FSK EVB7107-315-ASK Application Examples ! Keyless car and central locking ! Low-power telemetry ! Alarm and security systems ! General digital data transmission ! General analog audio signal transmission The TH7107 antenna board is designed to optimally match the differential power amplifier output to a loop antenna. The TH7107 can be populated either for FSK, ASK or FM transmission. The default population is for FSK or ASK transmission. Adding a varactor diode can easily be done in order to modify the circuit for analog FM. The evaluation board contains a differential-drive loop antenna printed on the PCB Printed Circuit Board . The size of the loop antenna is matched to the resonant frequency. Evaluation Board Example Page 1 of 10 EVB Description June/03 EVB7107 315/433MHz Transmitter Evaluation Board Description Document Content 1 Theory of Operation 3 Block Diagram 3 2 Functional Description FSK Modulation 4 Frequency Modulation 4 ASK Modulation 4 Mode Control 4 3 Circuit Diagram PCB Top View 6 Board Connection 6 Board Component Values 7 4 Package Information 5 Disclaimer Page 2 of 10 EVB Description June/03 EVB7107 315/433MHz Transmitter Evaluation Board Description 1 Theory of Operation General As depicted in Fig.1, the TH71071 transmitter consists of a fully integrated voltage-controlled oscillator VCO , a divide-by-32 divider div32 , a phase-frequency detector PFD and a charge pump. An external loop filter at pin LF determines the dynamic behaviour of the PLL and suppresses reference spurious signals. The VCO’s output signal feeds the power amplifier PA . RF signal power Po can be adjusted in six steps from Po = dBm to +2 dBm either by changing the value of resistor R1 or by varying the voltage VPS at pin PS/DATA. The open-collector differential output OUT1, OUT2 can be used to either directly drive a loop antenna or to be converted to a single-ended impedance by means of a balanced-to-unbalanced balun transformer. For maximum available output power, the differential output should be matched to a load of about 1 Bandgap biasing ensures stable operation of the IC at a power supply range of V to V. Block Diagram VCC 10 CKOUT 8 div 4 5 XTAL RO2 CX2 4 CX1 XOSC 3 DATA VCC 15 div32 PFD charge pump RPS PS 9 VCO mode control VEE 14 OUT1 13 OUT2 12 VEE 11 antenna or balun VCC

PDF Datasheet Preview

EVB7107
315/433MHz Transmitter Evaluation Board Description
! Fully integrated, PLL-stabilized VCO ! Frequency range from 310 MHz to 440 MHz ! FSK through crystal pulling allows modulation
from DC to 40 kbit/s ! High FSK deviation possible for wideband data
transmission ! ASK achieved by on/off keying of internal
power amplifier ! FM possible with external varactor ! Wide power supply range from V to V ! High over-all frequency accuracy ! Very low standby current
! Adjustable equivalent radiated power ERP
range from -25 dBm to -10 dBm ! Adjustable current consumption from
mA to mA ! FSK deviation and center frequency
independently adjustable ! Differential output well-suited for loop antenna ! External clock available for µC drive,
down to V supply ! ”Clock only” mode ! Conforms to EN 300 220 and similar standards
Ordering Information

Part No. EVB7107-433-FSK EVB7107-433-ASK

EVB7107-315-FSK EVB7107-315-ASK

Application Examples
! Keyless car and central locking ! Low-power telemetry ! Alarm and security systems ! General digital data transmission ! General analog audio signal transmission

The TH7107 antenna board is designed to optimally match the differential power amplifier output to a loop antenna. The TH7107 can be populated either for FSK, ASK or FM transmission. The default population is for FSK or ASK transmission. Adding a varactor diode can easily be done in order to modify the circuit for analog FM. The evaluation board contains a differential-drive loop antenna printed on the PCB Printed Circuit Board . The size of the loop antenna is matched to the resonant frequency.

Evaluation Board Example

Page 1 of 10

EVB Description June/03

EVB7107
315/433MHz Transmitter Evaluation Board Description

Document Content
1 Theory of Operation 3 Block Diagram 3
2 Functional Description FSK Modulation 4 Frequency Modulation 4 ASK Modulation 4 Mode Control 4
3 Circuit Diagram PCB Top View 6 Board Connection 6 Board Component Values 7
4 Package Information
5 Disclaimer

Page 2 of 10

EVB Description June/03

EVB7107
315/433MHz Transmitter Evaluation Board Description
1 Theory of Operation

General

As depicted in Fig.1, the TH71071 transmitter consists of a fully integrated voltage-controlled oscillator VCO , a divide-by-32 divider div32 , a phase-frequency detector PFD and a charge pump. An external loop filter at pin LF determines the dynamic behaviour of the PLL and suppresses reference spurious signals. The VCO’s output signal feeds the power amplifier PA . RF signal power Po can be adjusted in six steps from Po = dBm to +2 dBm either by changing the value of resistor R1 or by varying the voltage VPS at pin PS/DATA. The open-collector differential output OUT1, OUT2 can be used to either directly drive a loop antenna or to be converted to a single-ended impedance by means of a balanced-to-unbalanced balun transformer. For maximum available output power, the differential output should be matched to a load of about 1 Bandgap biasing ensures stable operation of the IC at a power supply range of V to V.

Block Diagram

VCC 10

CKOUT 8
div 4
5 XTAL

RO2 CX2 4 CX1

XOSC 3 DATA

VCC 15
div32 PFD
charge pump

RPS PS 9

VCO mode control

VEE 14 OUT1 13

OUT2 12

VEE 11
antenna or
balun VCC

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Datasheet ID: EVB7107B-315-FSK-C 647775