參數(shù)資料
型號(hào)： CC113LRTKT
廠商： TEXAS INSTRUMENTS INC
元件分類： 無(wú)繩電話/電話
英文描述： TELECOM, CELLULAR, RF AND BASEBAND CIRCUIT, PQCC20
封裝： 4 X 4 MM, GREEN, PLASTIC, VQFN-20
文件頁(yè)數(shù)： 7/75頁(yè)
文件大?。?/td> 1454K
代理商： CC113LRTKT
CC113L
SWRS108A
Page 15 of 68
6
Circuit Description
BIAS
RBIAS
XOSC_Q1 XOSC_Q2
CSn
SI
SO (GDO1)
XOSC
SCLK
FREQ
SYNTH
P
A
C
K
ET
H
A
N
D
LE
R
D
EM
O
D
U
LA
TO
R
X
FI
FO
D
IG
IT
A
L
IN
TE
R
FA
C
E
TO
M
C
U
RADIO CONTROL
GDO0
ADC
0
90
LNA
RF_P
RF_N
GDO2
Figure 7: CC113L Simplified Block Diagram
A simplified block diagram of CC113L is shown
CC113L features a low-IF receiver. The received
RF signal is amplified by the low-noise
amplifier
(LNA)
and
down-converted
in
quadrature (I and Q) to the intermediate
frequency (IF). At IF, the I/Q signals are
digitised by the ADCs. Automatic gain control
(AGC), fine channel filtering, demodulation,
and bit/packet synchronization are performed
digitally.
The
frequency
synthesizer
includes
a
completely on-chip LC VCO and a 90 degree
phase shifter for generating the I and Q LO
signals to the down-conversion mixers in
receive mode.
A crystal is to be connected to XOSC_Q1 and
XOSC_Q2. The crystal oscillator generates the
reference frequency for the synthesizer, as
well as clocks for the ADC and the digital part.
A 4-wire SPI serial interface is used for
configuration and data buffer access.
The digital baseband includes support for
channel configuration, packet handling, and
data buffering.
7
Application Circuit
Figure 8 shows the low cost CC113LEM
application circuit ([10] and [11]) (see Table 13
for component values).
The designs in [1] and [2] were used for CC113L
characterization. The application circuits are
shown in Figure 9 and Figure 10 (see Table 14
for component values).
7.1
Bias Resistor
The
56 k bias resistor R171 is used to set an
accurate bias current
7.2
Balun and RF Matching
The
balun
component
values
and
their
placement
are
important
to
keep
the
performance
optimized.
Gerber
files
and
schematics for the reference designs are
available for download from the TI website
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