MICRF112YMM Micrel Inc, MICRF112YMM Datasheet - Page 14

• Manufacturer Part Number: MICRF112YMM
• Description: IC XMITTER UHF ASK/FSK 10-MSOP
• Manufacturer: Micrel Inc

Specifications of MICRF112YMM

• Frequency: 300MHz ~ 450MHz
• Applications: RKE
• Modulation Or Protocol: ASK, OOK
• Data Rate - Maximum: 50 kbps
• Power - Output: 10dBm
• Current - Transmitting: 12.3mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 1.8 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Transmitting Current: 12.5mA
• Data Rate: 50Kbps
• Frequency Range: 300MHz To 450MHz
• Modulation Type: ASK, FSK
• Rf Ic Case Style: MSOP
• No. Of Pins: 10
• Supply Voltage Range: 1.8V To 3.6V
• Operating: RoHS Compliant
• Output Power: 10dBm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1963-5; MICRF112YMM

Application Information
Note: Values in parenthesis are for 315MHz
The MICRF112 is well suited to drive a 50 ohms source,
monopole or a loop antenna. Figure 6 is an example of a
loop antenna configuration. Figure 6 also shows both
315MHz and 433.92MHz ASK configurations for a loop
antenna. Besides using a different crystal, Table 1 lists
modified values needed for the listed frequencies.
Frequency
(MHz)
315.0
433.92
The reference design shown in Figure 6 has an antenna
optimized for using the matching network as described in
Table 1.
Power Control Using External Resistor
R7 is used to adjust the RF output levels which may be
needed to meet compliance. As an example, the
following tables list typical values of conducted RF
output levels and corresponding R7 resistor values for
the 50
Demo board using the loop antenna can be adjusted for
the appropriate radiated field allowed by FCC or ETSI
compliance. Contact Micrel for suggested values to meet
FCC and ETSI compliances.
Micrel, Inc.
March 2008
Ω
test board shown in Figure 2. R7 of the TX112
(nH)
470
680
L1
(pF)
C5
10
10
Table 1
(nH)
150
L4
82
(pF)
6.8
4.7
C7
Figure 6. ASK 433.92MHz and 315MHz
Y1 (MHz)
9.84375
13.5600
14
R7, Ω
0
75
100
500
1000
0
75
100
500
1000
R7, Ω
Output Power Versus External Resistor at 433.92 MHz
Output Power Versus External Resistor at 315MHz
Output Power, dBm
10
8.5
8.0
1.6
-3.8
Output Power, dBm
8.68
8.34
8.02
4.34
0.42
IDD, mA
6.7
6.3
6.2
4.13
4.87
IDD, mA
7.5
7.33
7.3
6.3
5.5
[phone]
M9999-031008
MICRF112