CC1050SLASHT datasheet(8/40 Pages) TI

8 / 40 page

CC1050

SWRS044

Page 8 of 40

Circuit Description

Figure 1. Simplified block diagram

A simplified block diagram of

CC1050 is

shown in Figure 1. Only signal pins are

shown.

The voltage controlled oscillator (VCO)

output signal is fed directly to the power

amplifier (PA). The RF output is frequency

shift keyed (FSK) by the digital bit stream

fed to the pin DI. The single ended PA

makes the antenna interface and matching

very easy.

The frequency synthesiser generates the

local oscillator signal which is fed to the

PA in transmit mode. The frequency

synthesiser consists of a crystal oscillator

(OSC), phase detector (PD), charge pump

(CHARGE PUMP), VCO, and frequency

dividers (/R and /N). An external crystal

must be connected to XOSC, and only an

external inductor is required for the VCO.

The

3-wire

digital

serial

interface

(CONTROL) is used for configuration.

PDATA, PCLK, PALE

VCO

OSC

CHARGE

PUMP

CHP_OUT

RF_OUT

CONTROL

XOSC_Q2

XOSC_Q1

DCLK

LPF

BIAS

R_BIAS

PDATA, PCLK, PALE

VCO

OSC

CHARGE

PUMP

CHP_OUT

RF_OUT

CONTROL

XOSC_Q2

XOSC_Q1

DCLK

LPF

BIAS

R_BIAS

Not Recommended for New Designs

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