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RF83//RF83C/RF83L/RF83CL ASK/OOK Receiver V2.0

 

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12.Functional Diagram

Figure 1. Block Diagram

13.Applications Information and Functional Description

Refer to figure 1 “Block Diagram”. Identified in the block diagram are the four sections of the IC:

UHF Downconverter, OOK Demodulator, Reference and Control, and Wakeup. Also shown in the

figure are two capacitors (CTH, CAGC) and one timing component, usually a crystal or ceramic

resonator. With the exception of a supply decoupling capacitor, and antenna impedance matching

network, these are the only external components needed by the RF83/RF83C to assemble a

complete UHF receiver.

For optimal performance is highly recommended that the RF83/RF83C is impedance matched to

the antenna, the matching network will add an additional two or three components.

For RF83, Four control inputs are shown in the block diagram: SEL0, SEL1, SWEN, and SHUT.

Using these logic inputs, the user can control the operating mode and selectable features of

the IC. These inputs are CMOS compatible, and are internally pulled-up. IF Bandpass Filter Roll-

off response of the IF Filter is 5th order, while the demodulator data filter exhibits a 2nd order

response.

13.1. Design Steps

The following steps are the basic design steps for using the RF83/RF83C receiver:

1) Select the operating mode (sweep or fixed, For RF83)

2) Select the reference oscillator

3) Select the CTH capacitor

4) Select the CAGC capacitor

5) Select the demodulator filter bandwidth