MRF49XA-I/ST Microchip Technology, MRF49XA-I/ST Datasheet - Page 73

• Manufacturer Part Number: MRF49XA-I/ST
• Description: IC RF TXRX 433/868/915 16-TSSOP
• Manufacturer: Microchip Technology

Specifications of MRF49XA-I/ST

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FHSS, FSK
• Applications: Home / Industrial Automation, Remote Access, Security Alarms
• Power - Output: 7dbm
• Sensitivity: -110dBm
• Voltage - Supply: 2.2 V ~ 3.8 V
• Current - Receiving: 11mA
• Current - Transmitting: 15mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 2
• Wireless Frequency: 433 MHz to 915 MHz
• Output Power: + 7 dBm
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Modulation: FHSS, FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 579-MRF49XA-1/ST

4.0
The application circuit of MRF49XA with a balun circuit
is shown in Figure 4-1.
FIGURE 4-1:
4.1
A balun circuit for a 50Ω antenna is shown in
Figure 4-2. If low tolerance components (i.e., ±5%) are
used with an appropriate ground, the impedance
remains close to the 50Ω measurement.
FIGURE 4-2:
© 2009 Microchip Technology Inc.
* C o n n e c tio n s a re o p tio n a l.
P IC
APPLICATION DETAILS
Antenna/Balun
®
M C U
M C L R
__ _ _ _
O S C 1
R C 7
R C 5
R C 4
R C 3
R C 2
R C 1
R C 0
R C 6
APPLICATION CIRCUIT
BALUN CIRCUIT
RFN
RFP
R C LK O U T /F C A P /F IN T *
+3.3V
F S K /D A T A /F S E L*
L1
L2
C LK O U T *
IN T /D IO *
R E S E T *
C5
S D O
S C K
IR O
S D I
Preliminary
C S
L3
C7
1
2
3
4
5
6
7
8
C6
V
D D
2.2 uF
16
15
14
13
12
11
10
C 1
9
J1
50Ω
433 MHz
868 MHz
915 MHz
Freq.
ANT
390 nH
100 nH
100 nH
L1
10 M H z
8.2 nH
8.2 nH
33 nH
L2
X 1
0 .01 uF
2 .2 n F
C 3
C 4 *
MRF49XA
47 nH
22 nH
22 nH
L3
Table 2-2)
2.7 pF
1.2 pF
1.2 pF
(see
C2
C5
DS70590B-page 71
B a lun
68 pF
27 pF
27 pF
5 0 O h m L o o p
C6
A n te n n a
5.1 pF
2.7 pF
2.7 pF
C7