BK4819

Rev.1.0

Copyright©2018 by Beken Corporation

BK4819

1 Functional Description

FSK Mod.

Com press

Emphasis

Scrambling

CTCCS

PLL

Modulator

De-

Emphasis

DAC

ADC

Tra nsm itter

Receiver

Squelc h

PLL

Filter

Demod

RSSI

ADC

ADC

MUX

MUX

MUX

Voice Act ivate

Switch

De-

Scrambling

FSK Demod.

LPF

CTCCS

BPF

26MHz

SPI

M

C

U

AGC

MIS C

CDCCS

SELCALL

DTMF

CDCCS

SELCALL

DTMF

Expander

Figure 1. Functional Block Diagram

1.1

Overview

The BK4819 integrates high performance PLL, ADC, DAC, and advanced digital

signal processing capability on a single chip. The digital low-IF image rejection

architecture enables it to work with a very simple MCU as a two way radio

communication system. On-chip flexible and precise continuous and discrete

tone generator and detector enable a secure link and digital signaling.

1.2

RF Transceiver

BK4819 includes an integrated RF transceiver which is compliant with the

specification most country in the world. The RF transceiver requires the following

external components to operate:

1) A 26MHz crystal;

2) Simple input matching and output matching;

3) Several SMD capacitors for decoupling and DC blocking.

1.2.1 FM Receiver

The receiver implements a low-IF image rejection architecture, which is

composed with two parts: RF front-end and IF part. The RF front-end comprises

a LNA and a quadrature mixer. The IF part comprises a low-pass filter (LPF) for

matching

相同 相似配对

decoupling分离

front-end

前置

comprises组成构成