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AN107

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1. Introduction

The purpose of this document is to provide the guidelines to design a low power consumption, low BOM and high

sensitivity CMT2210A Receiver.

2. CMT2210A Schematics Guidelines

The CMT2210A is an ultra low power, high performance, low-cost OOK stand-alone RF receiver for various 300 to

480 MHz wireless applications. The chip is part of the CMOSTEK NextGenRF

family, which includes a complete

line of transmitters, receivers and transceivers. To give the CMT2210A schematic design guidelines, an example of

315/433.92 MHz application is given below.

2.1 CMT2210A Evaluation Module Schematic

Only a few external components are required for the CMT2210A. Further optimizations can be done by removing

the connections of the optional pins.

Figure 1. CMT2210A-EM Schematic

AN107

CMT2210A Schematic and PCB Layout Design Guideline

Содержание CMT2210A

Страница 1: ...reless applications The chip is part of the CMOSTEK NextGenRFTM family which includes a complete line of transmitters receivers and transceivers To give the CMT2210A schematic design guidelines an exa...

Страница 2: ...d be within 60 in order to ensure a reliable start up The total tolerance is 20 ppm typically which include initial tolerance crystal loading aging and temperature dependence The acceptable tolerance...

Страница 3: ...ce clock input 10 nRSTO O Active low power on reset output to reset an external MCU 11 VCOP IO VCO tank connected to an external inductor 12 VCON 13 15 GND I Ground 14 RFIN I RF input 16 VDD I Power s...

Страница 4: ...transmission line is in proportion to the thickness of the PCB and the distance between the routing and grounding around it It is in inverse proportion to the width thickness of the routing and the di...

Страница 5: ...ignal routing should be smooth to avoid the impedance variation on the transmission lines which will result in RF signal reflection and performance inconsistency in mass production Wherever possible t...

Страница 6: ...d as this may shift the crystal DC operating point and result in duty cycle variation The XTAL circuit is shown in the figure below Figure 5 XTAL Circuit Layout 3 1 4 Digital Signals Routing The digit...

Страница 7: ...his port To minimize the radiation from the VCO circuit and maintain the high Q factor of the VCO tank L2 should be placed as close as possible to the CMT2210A The VCO tank is surrounded by a solid gr...

Страница 8: ...us ground plane metallization as possible 2 Place a series of ground vias along the PCB edges if possible The maximum distance between the vias should be less than 10 This is required to reduce the PC...

Страница 9: ...AN107 Rev 1 0 Page 9 10 www hoperf com 4 Document Change List Table 3 Document Change List Rev No Chapter Description of Changes Date 0 9 Initial released version 2014 06 14 1 0 2014 06 30...

Страница 10: ...is assumed for inaccuracies and specifications within this document are subject to change without notice The material contained herein is the exclusive property of CMOSTEK and shall not be distribute...