th71221 Melexis Company, th71221 Datasheet - Page 38

• Manufacturer Part Number: th71221
• Description: Transceiver - 27 To 930mhz, Fsk/fm/ask, Multi-channel 32l Qfn 5x5 Quad
• Manufacturer: Melexis Company

8
The operating frequency range of 300 MHz to 930 MHz can be covered without the use of an additional VCO
varactor diode. A frequency range extension down to 27 MHz can be realized by adding an external varactor
diode to the VCO tank.
Fig. 18: VCO tank circuit for
8.1
Note: The component values are optimized for the above listed settings of f
lation as explained in section 3.3.5 must be applied.
39010 071221
Rev. 006
CRX0
CTX4
CTX0
Part
LTX0
RPS
CB2
VD1
CF1
CF2
RB0
RF1
CB6
CB7
C01
R01
RF
C0
LO injection
L0
Extended Frequency Range
Board Component List (Fig. 18)
NR
NT
f
R
SOD-323
extended frequency range
Size
0805
0805
0603
0605
0605
0605
0605
0805
0805
0805
0805
0805
0805
0805
0805
0805
0805
Value @
27 MHz
25 kHz
330 pF
BBY65
220 nF
100 nF
1.2 µH
2.2 µH
1.8 kΩ
100 Ω
10 kΩ
15 kΩ
10 nF
10 nF
10 nF
1080
1508
22 Ω
high
1 nF
1 µF
NIP
NIP
TX_OUT
Value @
RX_IN
40 MHz
25 kHz
330 nH
330 pF
BBY65
100 nF
100 nF
Combining
1.8 kΩ
1.0 µH
100 Ω
10 kΩ
15 kΩ
33 pF
10 nF
10 nF
10 nF
1600
2028
22 Ω
1 nF
1 µF
high
network
NIP
LTX0
CRX0
CTX0
CB2
Value @
80 MHz
25 kHz
220 nH
220 nH
330 pF
100 nF
BB639
1.8 kΩ
100nF
100 Ω
10 kΩ
15 kΩ
68 pF
10 nF
10 nF
10 nF
3200
2772
18pF
NIP
1µF
low
0 Ω
Page 38 of 44
RPS
CTX4
25
26
27
28
29
OUT_PA
IN_LNA
VEE_LNA
OUT_LNA
GAIN_LNA
144 MHz
Value @
25 kHz
100 nH
100 nH
330 pF
BB833
100 nF
100 nF
2.7 kΩ
100pF
100 Ω
10 kΩ
22 kΩ
10 pF
5760
5332
1 nF
1 nF
1 nF
1µF
low
NIP
0 Ω
RF
TH71221
TH71121
R01
VD1
L0
C0
170 MHz
Value @
100 kHz
100 nH
100 pF
330 pF
100 nF
220 pF
220 pF
100 nF
BB535
8.2 pF
100 Ω
390 Ω
10 kΩ
33 kΩ
47 nH
1700
1807
high
1 nF
FSK/FM/ASK Transceiver
C01
NIP
1µF
0 Ω
R
, NR and NT. Direct VCO modu-
detect
VCC_DIG
RE/SCLK
ASK/FSK
Lock
IN_DTA
RB0
CB6
varactor diode
protection resistor
VCO tank resistor
loop filter resistor
loop filter resistor
power-select resistor
VCO tank inductor
VCO tank capacitor
VCO tank capacitor
de-coupling capacitor
loop filter capacitor
loop filter capacitor
TX impedance matching capacitor
TX coupling capacitor
RX coupling capacitor
TX impedance matching inductor
de-coupling capacitor
de-coupling capacitor
16
15
13
14
frequency resolution
SDEN
CB7
SDTA
SCLK
TH71221
Description
NR counter
NT counter
27 to 930MHz
3wire bus
VCC
VCC
Data Sheet
June/08