CC400 Chipcon, CC400 Datasheet - Page 11

• Manufacturer Part Number: CC400
• Description: Single Chip High Performance RF Reansceiver
• Manufacturer: Chipcon

Application Circuit
Very
required for operation of
application
operation is shown in figure 7. 1.2 kbps
data rate and 20 kHz FSK separation are
used.
shown in table 2.
Input / output matching
L51 and C51 are the input match for the
receiver, and L61 and C61 are the output
match for the transmitter. An internal T/R
switch circuitry makes it possible to
connect the input and output together
matching to 50 Ω. See “Input/output
matching” p.13 for details.
Synthesiser loop filter and VCO tank
The PLL loop filter consists of C121-C123
and R121-R123. The Component values
are easily calculated using the SmartRF
Studio software.
The VCO tank consists of C91-C93, L91
and the varactor (VAR). C91 determines
the coupling to the internal VCO amplifier,
and thus the VCO loop gain. This loop
Chipcon AS
Monopole
Monopole
antenna
antenna
C93
C93
few
L91
L91
C24
C24
Typical component values are
LC or SAW
LC or SAW
FILTER
FILTER
Optional
Optional
external
circuit
Figure 7. Typical
C25
C25
C92
C92
VAR
VAR
R123
R123
C91
C91
C10
C10
SmartRF
for
L61
L61
C123
C123
components
CC400
R122
R122
C11
C11
433.92
TM
C61
C61
R121
R121
L51
L51
CC400
. A typical
CC400
C12
C12
C51
C51
C122
C122
C121
C121
MHz
AVDD=3V
AVDD=3V
AVDD=3V
application for 433.92 MHz operation.
are
Datasheet (rev. 3.1) 2003-11-12
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
AVDD
AVDD
AGND
AGND
AGND
AGND
AGND
AGND
RF_IN
RF_IN
RF_OUT
RF_OUT
AVDD
AVDD
AVDD
AVDD
VCO_IN
VCO_IN
AGND
AGND
AGND
AGND
CHP_OUT
CHP_OUT
AVDD
AVDD
AVDD
AVDD
SmartRF
gain is also controlled by the ‘VCO gain’
setting in SmartRF Studio, by changing
the amplifier current. C92 together with the
varactor’s capacitance ratio determines
the
sensitivity should be 20 MHz/V. L91 and
C93 is used to set the absolute range of
the VCO. See Application Note AN012
“VCO fine-tuning CC400 and CC900” for
more details.
Additional filtering
Additional
ceramic IF-filter, RF LC or SAW-filter) may
be
performance for specific applications. See
also “Optional LC filter” p.14 for further
information.
Voltage supply decoupling
C10-C12, C24-C25, C210 and C211 are
voltage supply de-coupling capacitors.
These capacitors should be placed as
close as possible to the voltage supply
pins of
used as a reference design.
used
VCO
CC400
in
external
sensitivity
. The CC400DB should be
order
XOSC_Q2
XOSC_Q2
XOSC_Q1
XOSC_Q1
IF_OUT
IF_OUT
STROBE
STROBE
IF_IN
IF_IN
PDATA
PDATA
CLOCK
CLOCK
DGND
DGND
LOCK
LOCK
DGND
DGND
AGND
AGND
DVDD
DVDD
DVDD
DVDD
DIO
DIO
®
components
to
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
20
20
19
19
18
18
17
17
16
16
15
15
(MHz/V).
CC400
improve
Optional
Optional
455kHz
455kHz
Page 11 of 27
R7
R7
C151
C151
XTAL
XTAL
XTAL
DVDD=3V
DVDD=3V
C210 C211
C210 C211
(e.g.
The
the
C161
C161