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CC400-RTR2 데이터시트(PDF) 9 Page - Texas Instruments

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부품명 CC400-RTR2
상세설명  Single Chip High Performance RF Transceiver
PDF  10 Pages
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제조업체  TI [Texas Instruments]
홈페이지  http://www.ti.com
Logo TI - Texas Instruments

CC400-RTR2 데이터시트(HTML) 9 Page - Texas Instruments

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CC400
SWRS050
Page 9 of 32
11.
Circuit Description
Figure 2: Simplified block diagram of the
CC400.
A simplified block diagram of
CC400 is
shown in Figure 2. Only signal pins are
shown.
In receive mode
CC400 is configured as a
traditional heterodyne 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 an external IF filter can be used for
improved performance. After demodulation
CC400 outputs the raw digital demodulated
data on the pin DIO. Synchronisation and
final qualification of the demodulated data
is done by the interfacing digital system
(microcontroller).
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 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 an
external LC-tank with a varactor diode is
required for the VCO. For flexibility the
loop filter is external.
For chip configuration
CC400 includes a 3-
wire digital serial interface (CONTROL).
CLOCK, PDATA, STROBE
LNA
PA
DEMOD
VCO
Freq. divider
PD
OSC
~
/N
MIXER
CHARGE
PUMP
VCO_IN
RF_IN
DIO
CHP_OUT
LOCK
IF STAGE
RF_OUT
IF_OUT IF_IN
3
CONTROL
XOSC_Q2
XOSC_Q1
/R



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