CMOSTEK CMT2219B Manual Download Page 1

 
 

AN199 

Rev0.7 | 1

/8

 

www.cmostek.com

 

 

 

 

 

 

 

Overview 

 

This document discusses the RF frequency calculation formula for CMT2300A / CMT2119B / CMT2219B, which helps on further 

design and application based on the products. 

The product models covered in this document are shown in the below table. 

 

Table 1. Product Models Covered in This Document 

Product Model 

Frequency Range 

Modulation Type 

Main Function 

Configuration Mode 

Packaging 

CMT2300A 

126.33 - 1020

 

MHz 

(G)FSK/OOK 

Transceiver 

Register 

QFN16 

CMT2119B 

126.33 - 1020

 

MHz 

(G)FSK/OOK 

Transmitter 

Register 

QFN16 

CMT2219B 

126.33 - 1020

 

MHz 

(G)FSK/OOK 

Receiver 

Register 

QFN16 

 

Before  reading  this  document,  it  is  recommended  to read  the 

AN142-CMT2300A Quick Start Guide,

 

AN184-CMT2119B Quick 

Start Guide 

and

 

AN161-CMT2219B 

Quick Start Guide

 to understand the basic information of the 3 products. 

 

 

 

 

AN199 

CMT2300A/CMT2119B/CMT2219B RF Frequency Calculation Guide

 

Copyright © By CMOSTEK   

Summary of Contents for CMT2219B

Page 1: ...ange Modulation Type Main Function Configuration Mode Packaging CMT2300A 126 33 1020 MHz G FSK OOK Transceiver Register QFN16 CMT2119B 126 33 1020 MHz G FSK OOK Transmitter Register QFN16 CMT2219B 126...

Page 2: ...AN199 Rev0 7 2 8 www cmostek com Table of Contents 1 RF Frequency Calculation 3 1 1 Configuring RF Parameters of RX 3 1 2 Configuring RF Parameters of TX 6 2 Revise History 7 3 Contacts 8...

Page 3: ...bits of the register 1 1 Configuring RF Parameters of RX To configure the frequency of RX the below items need to be configured FREQ_VCO_BANK 2 0 FREQ_DIVX_CODE 2 0 FREQ_RX_N 7 0 FREQ_RX_K 19 0 AFC_O...

Page 4: ...ted local oscillator frequency in Hz FREQ_LO FREQ_RF x 10 6 26 MHz 92 Then calculate the value of the frequency word N K N K FREQ_LO x DIVIDER 26 MHz Obtain the integer part of N K and convert it to b...

Page 5: ...ith an address of 0x27 CUS_FSK4 to make the receiver work normally otherwise the receiver may have error when performing AFC which may cause receiving failure For example if the target RF frequency fo...

Page 6: ...frequency of RX In the formula below FREQ_RF is the target RF frequency in MHz FREQ_LO is the calculated local oscillator frequency in Hz FREQ_LO FREQ_RF x 10 6 Then calculate the value of the freque...

Page 7: ...AN199 Rev0 7 7 8 www cmostek com 2 Revise History Table 1 Revise History Records Version No Chapter Description Date 0 7 All Initial version 2018 10 10...

Page 8: ...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 distributed reproduced...

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