MICRF112YMM Micrel Inc, MICRF112YMM Datasheet - Page 13
![IC XMITTER UHF ASK/FSK 10-MSOP](/photos/6/84/68455/576-10-msop_sml.jpg)
MICRF112YMM
Manufacturer Part Number
MICRF112YMM
Description
IC XMITTER UHF ASK/FSK 10-MSOP
Manufacturer
Micrel Inc
Datasheet
1.MICRF112-433_EV.pdf
(20 pages)
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
MICRF112YMM
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
MICRF112YMM
Manufacturer:
MICREL
Quantity:
700
Part Number:
MICRF112YMM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
Company:
Part Number:
MICRF112YMM-TR
Manufacturer:
TI
Quantity:
87
Crystal Oscillator for FSK Operation
Figure 5 shows reference oscillator circuit configuration
for FSK operation. To operate the MICRF112 in FSK
mode, one additional capacitor is needed between
XTALOUT pin and XTALMOD pin. Crystal parameters
for FSK operation are the same as ASK operation
except:
PLL ×32
The function of PLL×32 is to provide a stable carrier
frequency for transmission. It is a “divided by 32” phase
locked oscillator.
Micrel, Inc.
March 2008
•
•
Figure 5. Reference Oscillator FSK Operation
When the ESR of crystal is at 20Ω, C
not to exceed 70pF.
When the ESR of crystal is at 300Ω, C
C
LOAD
not to exceed 30pF
FSK
+ C
FSK
LOAD
+
13
Power Amplifier
The power amplifier serves two purposes: 1) to buffer
the VCO from external elements and 2) to amplify the
phase locked signal. The power amplifier can produce
+10dBm at 3V (typical).
Enable Control
Enable control gates the ASK data. It only allows
transmission when Lock, Amplitude and Under Voltage
Detect conditions are valid.
Under Voltage Detect
“Under voltage detect” block senses operating voltage.
If the operating voltage falls below 1.6V, “under voltage
detect” block will send a signal to “enable control” block
to disable the PA.
Open Drain Switch
Open drain switch is used for FSK operation. FSK data
is fed into the FSK pin. The FSK pin is connected to the
gate of the open drain switch. The open collector is
connected to the XTALMOD pin. In Figure 4, a capacitor
is shown connected from XTALMOD pin to XTALOUT.
When FSK pin goes high, the capacitor between
XTALMOD and XTALOUT pulls the frequency of
REFOSC low
(408) 944-0800
M9999-031008
MICRF112
.