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CC1000PWR Datasheet(PDF) 9 Page - Texas Instruments

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Part # CC1000PWR
Description  Single Chip Very Low Power RF Transceiver
Download  55 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

CC1000PWR Datasheet(HTML) 9 Page - Texas Instruments

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CC1000
SWRS048A
Page 9 of 55
5. Circuit Description
Figure 1. Simplified block diagram of the
CC1000
A simplified block diagram of
CC1000 is
shown in Figure 1. Only signal pins are
shown.
In receive mode
CC1000 is configured as a
traditional superheterodyne receiver. The
RF input signal is amplified by the low-
noise amplifier (LNA) and converted down
to the intermediate frequency (IF) by the
mixer
(MIXER).
In
the
intermediate
frequency
stage
(IF
STAGE)
this
downconverted signal is amplified and
filtered
before
being
fed
to
the
demodulator (DEMOD). As an option a
RSSI signal, or the IF signal after the
mixer is available at the RSSI/IF pin. After
demodulation
CC1000 outputs the digital
demodulated
data
on
the
pin
DIO.
Synchronisation is done on-chip providing
data clock at DCLK.
In transmit mode 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 DIO.
The internal T/R switch circuitry makes the
antenna interface and matching very easy.
The frequency synthesiser generates the
local oscillator signal which is fed to the
MIXER in receive mode and to the PA in
transmit mode. The frequency synthesiser
consists of a crystal oscillator (XOSC),
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
LNA
PA
DEMOD
VCO
PD
OSC
~
/N
MIXER
CHARGE
PUMP
L1
RF_IN
DIO
CHP_OUT
IF STAGE
RF_OUT
RSSI/IF
3
CONTROL
XOSC_Q2
XOSC_Q1
/R
DCLK
L2
LPF
BIAS
R_BIAS
PDATA, PCLK, PALE
LNA
PA
DEMOD
VCO
PD
OSC
~
/N
MIXER
CHARGE
PUMP
L1
RF_IN
DIO
CHP_OUT
IF STAGE
RF_OUT
RSSI/IF
3
CONTROL
XOSC_Q2
XOSC_Q1
/R
DCLK
L2
LPF
BIAS
R_BIAS


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