MICRF211AYQS Micrel Inc, MICRF211AYQS Datasheet - Page 10

• Manufacturer Part Number: MICRF211AYQS
• Description: IC RX 3V 380-450 MHZ 16-QSOP
• Manufacturer: Micrel Inc

Specifications of MICRF211AYQS

• Operating Temperature: -40°C ~ 105°C
• Frequency: 380MHz ~ 450MHz
• Sensitivity: -110dBm
• Data Rate - Maximum: 10 kbps
• Modulation Or Protocol: ASK, OOK
• Applications: ISM, Garage Door Openers, RKE
• Current - Receiving: 6mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Features: No IF Filter Required
• Voltage - Supply: 3 V ~ 3.6 V
• Package / Case: 16-QSOP
• Data Rate: 1Kbps
• Frequency Range: 380MHz To 450MHz
• Modulation Type: ASK, OOK
• Sensitivity Dbm: -110dBm
• Rf Ic Case Style: QSOP
• No. Of Pins: 16
• Supply Voltage Range: 3V To 3.6V
• Operating Frequency (max): 450000kHz
• Operating Temperature (min): -40C
• Operating Temperature (max): 105C
• Operating Temperature Classification: Industrial
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-1964-5; MICRF211AYQS

March 2007
Micrel
Crystal Y1 or Y1A (SMT or leaded respectively) is the
reference clock for all the device internal circuits.
Crystal characteristics of 10pF load capacitance,
30ppm, ESR < 50Ω, -40ºC to +105ºC temperature
range are desired. Table 5 shows the crystal
frequencies and one of Micrel’s approved crystal
manufacturers (www.hib.com.br).
The oscillator of the MICRF211 is a Colpitts type. It is
very sensitive to stray capacitance loads. Thus, very
good care must be taken when laying out the printed
circuit board. Avoid long traces and ground plane on
the top layer close to the REFOSC pins RO1 and
RO2. When care is not taken in the layout, and
crystals from other vendors are used, the oscillator
may take longer times to start as well as the time to
good data in the DO pin to show up. In some cases, if
the stray capacitance is too high (> 20pF), the
oscillator may not start at all.
The crystal frequency is calculated by REFOSC = RF
Carrier/(32+(1.1/12)). The local oscillator is low side
REFOSC (MHz)
12.15269
13.02519
13.52127
Table 5. Crystal Frequency and Vendor Part Number.
Carrier (MHz)
390.0
418.0
433.92
10
injection (32 × 13.52127MHz = 432.68MHz), that is,
its frequency is below the RF carrier frequency and
the image frequency is below the LO frequency. See
Figure 6
local oscillator signal will yield the IF frequency, which
will be demodulated by the detector of the device.
HIB Part Number
SA-12.152690-F-10-H-30-30-X
SA-13.025190-F-10-H-30-30-X
SA-13.521270-F-10-H-30-30-X
Figure 6. Low Side Injection Local Oscillator.
. The product of the incoming RF signal and
[phone]
M9999-030107
MICRF211