MICRF211AYQS Micrel Inc, MICRF211AYQS Datasheet - Page 11

• 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

Micrel
JP1 and JP2 are the bandwidth selection for the
demodulator bandwidth. To set it correctly, it is
necessary to know the shortest pulse width of the
encoded data sent in the transmitter. Like in the
example of the data profile in the figure 7 below, PW2
is shorter than PW1, so PW2 should be used for the
demodulator bandwidth calculation which is found by
0.65/shortest pulse width. After this value is found, the
setting should be done according to Table 6. For
example, if the pulse period is 100µsec, 50% duty
cycle, the pulse width will be 50µsec (PW = (100µsec
× 50%) / 100). So, a bandwidth of 13kHz would be
necessary (0.65 / 50µsec). However, if this data
stream had a pulse period with 20% duty cycle, the
bandwidth required would be 32.5kHz (0.65 / 20µsec),
which exceeds the maximum bandwidth of the
demodulator circuit. If one tries to exceed the
maximum
stretched or wider.
Other frequencies will have different demodulator
bandwidth limits, which are derived from the reference
oscillator frequency. Table 7 and Table 8 below shows
the limits for the other two most used frequencies.
March 2007
SEL0
SEL0
Short
Open
Short
Open
Short
Open
Short
Open
JP1
JP1
Table 6. JP1 and JP2 setting, 433.92 MHz.
Table 7. JP1 and JP2 setting, 418.0 MHz.
SEL1
SEL1
Short
Short
Open
Open
Short
Short
Open
Open
JP2
JP2
bandwidth,
Demod.
Demod.
(hertz)
(hertz)
13000
12523
1625
3250
6500
1565
3130
6261
BW
BW
the
Shortest
Shortest
pulse
(µsec)
(µsec)
Pulse
Pulse
400
200
100
416
208
104
50
52
would
baud rate for
baud rate for
Cycle (hertz)
Cycle (hertz)
Maximum
Maximum
50% Duty
50% Duty
10000
1250
2500
5000
1204
2408
4816
9633
appear
11
Capacitors C6 and C4, C
provide time base reference for the data pattern
received. These capacitors are selected according to
data profile, pulse duty cycle, dead time between two
received data packets, and if the data pattern has or
does not have a preamble. See Figure 7, example of
a data profile.
For best results the capacitors should always be
optimized for the data pattern used. As the baud rate
increases, the capacitor values decrease. Table 9
shows suggested values for Manchester Encoded
data, 50% duty cycle.
JP3 is a jumper used to configure the digital squelch
function. When it is high, there is no squelch applied
to the digital circuits and the DO (data out) pin has a
hash signal. When the pin is low, the DO pin activity is
SEL0
Short
Open
Short
Open
JP1
SEL0
Open
Open
Short
Short
JP1
Table 9. Suggested C
Table 8. JP1 and JP2 setting, 390.0 MHz.
Figure 7. Example of a Data Profile.
SEL1
Short
Short
Open
Open
JP2
SEL1
Short
Open
Open
Short
JP2
Demod.
(hertz)
11684
1460
2921
5842
BW
Demod.
(hertz)
13000
1625
3250
6500
BW
TH
TH
Shortest
and C
(µsec)
and C
Pulse
445
223
111
56
100nF
AGC
47nF
22nF
10nF
Cth
AGC
Values.
[phone]
M9999-030107
baud rate for
Cycle (Hertz)
respectively
MICRF211
Maximum
50% Duty
1123
2246
4493
8987
0.47µF
4.7µF
2.2µF
Cagc
1µF