EVB7122-433-FSK-C

EVB7122-433-FSK-C Datasheet

EVB7122

Part	Datasheet
EVB7122-433-FSK-C	EVB7122-433-FSK-C (pdf)

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Single chip solution with only a few external components Stand-alone fixed-frequency user mode Programmable multi-channel user mode Low current consumption in active mode and very low standby current PLL-stabilized RF VCO LO with internal varactor diode Lock detect output in programmable user mode On-chip AFC for extended input frequency acceptance range FSK for digital data or FM for analog signal reception EVB7122 27 to 930MHz Transceiver Evaluation Board Description FSK/ASK mode selection RSSI output for signal strength indication and ASK reception ASK detection normal or with peak detector Switchable LNA gain for improved dynamic range Automatic PA turn-on after PLL lock ASK modulation achieved by PA on/off keying 3wire bus serial control interface EVB comes with a cable to connect to a PC’s LPT port EVB programming software is available on Melexis web site Ordering Information EVB7122-315-FSK-C EVB7122-433-FSK-C EVB7122-868-FSK-C EVB7122-915-FSK-C * EVB7122-XXX-YYY-C with XXX = Reception frequency 315, or 915MHz and YYY = Modulation FSK or ASK . EVB default population is FSK, ASK modifications according to paragraph and * The evaluation board is supplied with a SMA connector. Application Examples General bi-directional half duplex digital data RF signaling or analog signal communication Tire Pressure Monitoring Systems TPMS Remote Keyless Entry RKE Low-power telemetry systems Alarm and security systems Wireless access control Garage door openers Networking solutions Active RFID tags Remote controls Home and building automation Evaluation Board Example The TH7122 is a single chip FSK/FM/ASK transceiver IC. It is designed to operate in low-power multichannel programmable or single-channel stand-alone, half-duplex data transmission systems. It can be used for applications in automotive, industrial-scientific-medical ISM , short range devices SRD or similar applications operating in the frequency range of 300 MHz to 930 MHz. In programmable user mode, the transceiver can operate down to 27 MHz by employing an external VCO varactor diode. Page 1 of 24 EVB Description June/08 EVB7122 27 to 930MHz Transceiver Evaluation Board Description Document Content 1 Theory of Operation 3 Technical Data 3 Note on ASK Operation 3 Block Diagram 4 User Mode Features 4 2 Description of User Stand-alone User Mode Operation 5 Frequency Selection 5 Operation Mode 5 Modulation Type 6 LNA Gain Mode 6 Programmable User Mode 6 Serial Control Interface Description 6 3 Register Description Register Overview 8 Default Register Settings for FS0, 8 A word 9 B word 10 C 11 D 12 4 Application Circuits FSK Application Circuit Programmable User Mode internal AFC option ...................... 13 Board Component Values for FSK Reception 14 Component Arrangement Top Side for FSK Reception 15 ASK Application Circuit Programmable User Mode normal data slicer option 16 Board Component Values for ASK normal data slicer option 17 Component Arrangement Top Side for ASK Reception normal data slicer option 18 ASK Application Circuit with Peak Detector Option 19 Board Component Values for ASK peak detector 20 Component Arrangement Top Side for ASK Reception peak detector option ........................ 21 5 Evaluation Board Layouts 6 Package Description Soldering Information 23 7 Disclaimer Page 2 of 24 EVB Description June/08 EVB7122 27 to 930MHz Transceiver Evaluation Board Description 1 Theory of Operation General The main building block of the transceiver is a programmable PLL frequency synthesizer that is based on an integer-N topology. The PLL is used for generating the carrier frequency during transmission and for generating the LO signal during reception. The carrier frequency can be FSK-modulated by pulling the crystal and ASK-modulated by on/off keying of the power amplifier. The receiver is based on the principle of a single conversion superhet. Therefore the VCO frequency has to be changed between transmit and receive mode. In receive mode, the preferred LO injection type is low-side injection. The TH7122 transceiver IC consists of the following building blocks: Low-noise amplifier LNA for high-sensitivity RF signal reception with switchable gain Mixer MIX for RF-to-IF down-conversion IF amplifier IFA to amplify and limit the IF signal and for RSSI generation Phase-coincidence demodulator with external ceramic discriminator FSK Demodulator Operational amplifier OA1 , connected to

PDF Datasheet Preview

Single chip solution with only a few external components
Stand-alone fixed-frequency user mode Programmable multi-channel user mode Low current consumption in active mode and
very low standby current PLL-stabilized RF VCO LO with internal
varactor diode Lock detect output in programmable
user mode On-chip AFC for extended input frequency
acceptance range FSK for digital data or FM for analog signal
reception

EVB7122
27 to 930MHz Transceiver Evaluation Board Description
FSK/ASK mode selection RSSI output for signal strength indication and

ASK reception ASK detection normal or with peak detector Switchable LNA gain for improved dynamic
range Automatic PA turn-on after PLL lock ASK modulation achieved by PA on/off keying 3wire bus serial control interface EVB comes with a cable to connect to a PC’s

LPT port EVB programming software is available on

Melexis web site
Ordering Information

EVB7122-315-FSK-C EVB7122-433-FSK-C

EVB7122-868-FSK-C EVB7122-915-FSK-C
* EVB7122-XXX-YYY-C with XXX = Reception frequency 315, or 915MHz and YYY = Modulation FSK or ASK . ** EVB default population is FSK, ASK modifications according to paragraph and *** The evaluation board is supplied with a SMA connector.

Application Examples
General bi-directional half duplex digital data

RF signaling or analog signal communication Tire Pressure Monitoring Systems TPMS Remote Keyless Entry RKE Low-power telemetry systems Alarm and security systems Wireless access control Garage door openers Networking solutions Active RFID tags Remote controls Home and building automation

Evaluation Board Example

The TH7122 is a single chip FSK/FM/ASK transceiver IC. It is designed to operate in low-power multichannel programmable or single-channel stand-alone, half-duplex data transmission systems. It can be used for applications in automotive, industrial-scientific-medical ISM , short range devices SRD or similar applications operating in the frequency range of 300 MHz to 930 MHz. In programmable user mode, the transceiver can operate down to 27 MHz by employing an external VCO varactor diode.

Page 1 of 24

EVB Description June/08

EVB7122
27 to 930MHz Transceiver Evaluation Board Description

Document Content
1 Theory of Operation
3 Technical Data 3 Note on ASK Operation 3 Block Diagram 4 User Mode Features 4
2 Description of User

Stand-alone User Mode Operation 5 Frequency Selection 5 Operation Mode 5 Modulation Type 6 LNA Gain Mode 6

Programmable User Mode 6 Serial Control Interface Description 6
3 Register Description

Register Overview 8 Default Register Settings for FS0, 8 A word 9 B word 10 C 11 D 12
4 Application Circuits

FSK Application Circuit Programmable User Mode internal AFC option ...................... 13 Board Component Values for FSK Reception 14 Component Arrangement Top Side for FSK Reception 15

ASK Application Circuit Programmable User Mode normal data slicer option 16 Board Component Values for ASK normal data slicer option 17 Component Arrangement Top Side for ASK Reception normal data slicer option 18

ASK Application Circuit with Peak Detector Option 19 Board Component Values for ASK peak detector 20 Component Arrangement Top Side for ASK Reception peak detector option ........................ 21
5 Evaluation Board Layouts
6 Package Description

Soldering Information 23
7 Disclaimer

Page 2 of 24

EVB Description June/08

EVB7122
27 to 930MHz Transceiver Evaluation Board Description
1 Theory of Operation

General

The main building block of the transceiver is a programmable PLL frequency synthesizer that is based on an integer-N topology. The PLL is used for generating the carrier frequency during transmission and for generating the LO signal during reception. The carrier frequency can be FSK-modulated by pulling the crystal and ASK-modulated by on/off keying of the power amplifier. The receiver is based on the principle of a single conversion superhet. Therefore the VCO frequency has to be changed between transmit and receive mode. In receive mode, the preferred LO injection type is low-side injection.

The TH7122 transceiver IC consists of the following building blocks:

Low-noise amplifier LNA for high-sensitivity

RF signal reception with switchable gain Mixer MIX for RF-to-IF down-conversion IF amplifier IFA to amplify and limit the IF
signal and for RSSI generation Phase-coincidence demodulator with external
ceramic discriminator FSK Demodulator Operational amplifier OA1 , connected to

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Datasheet ID: EVB7122-433-FSK-C 647782