MICRF211AYQS Micrel Inc, MICRF211AYQS Datasheet - Page 12

• 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
considerably reduced. It will have more or less than
shown in the figure below depending on the outside
band noise. The penalty for using squelch is a delay in
getting a good signal in the DO pin, that is, it takes
longer for the data to show up. The delay is
dependent upon many factors such as RF signal
intensity, data profile, data rate, C
capacitor values, and outside band noise. See Figure
8 and Figure 9 below.
Other components used are C5, which is a decoupling
capacitor for the Vdd line, R4 reserved for future use
and not needed for the evaluation board, R3 for the
shutdown pin (SHDN = 0, device is operation), which
can be removed if that pin is connected to a
microcontroller or an external switch, R1 and R2
Figure 8. Data Out Pin with No Squelch (SQ = 1).
Figure 9. Data Out Pin with Squelch (SQ = 0).
TH
and C
AGC
12
which form a voltage divider for the AGC pin. One can
force a voltage in this AGC pin to purposely decrease
the device sensitivity. Special care is needed when
doing this operation, as an external control of the AGC
voltage may vary from lot to lot and may not work the
same for several devices.
Three other pins are worthy of comment. They are the
DO, RSSI, and shut down pins. The DO pin has a
driving capability of 0.4mA. This is good enough for
most of the logic family ICs in the market today. The
RSSI pin provides a transfer function of the RF signal
intensity vs voltage. It is very useful to determine the
signal to noise ratio of the RF link, crude range
estimate from the transmitter source and AM
demodulation, which requires a low C
value.
The shut down pin (SHDN) is useful to save energy.
When its level close to V
not in operation. Its DC current consumption is less
than 1µA (do not forget to remove R3). When toggling
from high to low, there will be a time required for the
device to come to steady state mode, and a time for
data to show up in the DO pin. This time will be
dependent upon many things such as temperature,
crystal used, and if the there is an external oscillator
with faster startup time. Normally, with the crystal
vendors suggested, the data will show up in the DO
pin around 1msec time, and 2msec over the
temperature range of the device. When using an
external oscillator or reference oscillator signal, the
time is reduced considerably and can be around
140µsec. See Figures Figure 10 and 11.
Figure 10: Time-to-Good Data After Shut Down Cycle,
Room Temperature.
DD
(SHDN = 1), the device is
[phone]
M9999-030107
AGC
MICRF211
capacitor