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PDF MICRF220 Data sheet ( Hoja de datos )
| Número de pieza | MICRF220 | |
| Descripción | 3.3V ASK/OOK Receiver | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MICRF220
300MHz to 450MHz, 3.3V ASK/OOK Receiver
with RSSI and Squelch
General Description
The MICRF220 is a 300MHz to 450MHz super-
heterodyne, image-reject, RF receiver with automatic
gain control, ASK/OOK demodulator, analog RSSI
output, and integrated squelch features. It only requires
a crystal and a minimum number of external components
to implement. The MICRF220 is ideal for low-cost, low-
power, RKE, TPMS, and remote actuation applications.
The MICRF220 achieves −110dBm sensitivity at a bit
rate of 1kbps with 0.1% BER. Four demodulator filter
bandwidths are selectable in binary steps from 1625Hz
to 13kHz at 433.92MHz, allowing the device to support
bit rates up to 20kbps. The device operates from a
supply voltage of 3.0V to 3.6V, and typically consumes
4.3mA of supply current at 315MHz and 6.0mA at
433.92MHz. A shutdown mode reduces supply current to
0.1μA typical. The squelch feature decreases the activity
on the data output pin until valid bits are detected while
maintaining overall receiver sensitivity.
Datasheets and support documentation can be found on
Micrel’s website at: www.micrel.com.
Typical Application
Features
• –110dBm sensitivity at 1kbps with 0.1% BER
• Supports bit rates up to 20kbps at 433.92MHz
• 25dB image-reject mixer
• No IF filter required
• 60dB analog RSSI output range
• 3.0V to 3.6V supply voltage range
• 4.3mA supply current at 315MHz
• 6.0mA supply current at 434MHz
• 0.1µA supply current in shutdown mode
• Data output squelch until valid bits detected
• 16-pin QSOP package (4.9mm x 6.0mm)
• −40˚C to +105˚C temperature range
• 3kV HBM ESD Rating
433.92MHz, 1kbps Operation
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
August 19, 2015
Revision 2.0
[email protected] or (408) 944-0800
1 page  
Micrel, Inc.
Typical Characteristics
VDD = 3.3V, TA = +25ºC, BER measured with PN9 sequence, unless otherwise noted.
Current vs. Receiver
Frequency
6.5
6.0
5.5
5.0
4.5
4.0
3.5
300 325 350 375 400 425 450
Receiver Frequency (MHz)
Current vs. Supply Voltage
fRF = 433.92MHz
7.5
+105ºC
7.0
6.5
6.0 +25ºC
5.5
5.0
4.5
3.0
-40ºC
3.2 3.4
Supply Voltage (V)
3.6
CAGC Voltage vs. Input
Power
2.0
1.8
+105ºC
1.6
1.4 -40ºC
+25ºC
1.2
1.0
-125
-100 -75 -50 -25
Input Power (dBm)
0
RSSI vs. Input Power
2.5
2.0
1.5
+25ºC
1.0
-40ºC
+105ºC
0.5
0.0
-125 -100 -75 -50 -25
Input Power (dBm)
0
Sensitivity at 1% BER
VSEL1 = VSEL0 = 0V
-98
-100
-102
-104
-106
-108
-110
315MHz
433.92MHz
-112
-114
-116
0 2 4 6 8 10
12
Bit Rate (kbps)
Sensitivity at 1% BER
VSEL1 = 0V, VSEL0 = 3.3V
-100
-102
-104
-106
315MHz
-108
-110
433.92MHz
-112
-114
0
3 6 9 12 15 18 21
Bit Rate (kbps)
August 19, 2015
5
MICRF220
Current vs. Supply Voltage
fRF = 315MHz
5.0
+105ºC
4.5
+25ºC
4.0
3.5
3.0
-40ºC
3.2 3.4
Supply Voltage (V)
3.6
BER vs. Input Power
VSEL1 = VSEL0 = 0V
10
433.92MHz
315MHz
1`
PN9 sequence
at 1kbps
0.1
-116 -115 -114 -113 -112 -111 -110
Input Power (dBm)
Sensitivity at 1% BER
VSEL1 = 3.3V, VSEL0 = 0V
-98
-100
-102
-104
-106
-108
315MHz
433.92MHz
-110
-112
0
10 20 30
Bit Rate (kbps)
40
Revision 2.0
5 Page 
Micrel, Inc.
RO2
C
RO1
C
V BIAS
R
MICRF220
Figure 5. Reference Oscillator Circuit
Reference oscillator crystal frequency can be calculated
according to Equation 3. For example, if fRF = 433.92MHz,
fREF = 13.52313MHz. Table 4 lists the values of reference
frequencies at different popular RF frequencies. To
operate the MICRF220 with minimum offset, use proper
loading capacitance recommended by the crystal
manufacturer.
Figure 6. Data Out Pin with No Squelch (VSQ = VDD)
RF Input Frequency (MHz)
315.0
390.0
418.0
433.92
Reference Frequency (MHz)
9.81713*
12.15446
13.02708
13.52313*
*Empirically derived, slightly different from Equation 3.
Table 4. Reference Frequency Examples
When squelch function is enabled by tying the SQ pin low,
the chip will monitor incoming pulse width before allowing
activity on DO pin. The pulse width is set by SEL1 and
SEL0 pins as shown in Table 5, and is inversely
proportional to frequency. When there is no input signal
and squelch is not enabled (SQ pin left floating), voltage on
DO chatters due to random noise as shown in Figure 6. If
SQ pin is tied low, the activity on DO pin is much reduced
as shown in Figure 7.
Squelch Operation
When squelch function is enabled by tying the SQ pin low,
the chip will monitor incoming pulse width before allowing
activity on DO pin. The pulse width is set by SEL1 and
SEL0 pins as shown in Table 5, and is inversely
proportional to frequency. When there is no input signal
and squelch is not enabled (SQ pin left floating), voltage on
DO chatters due to random noise as shown in Figure 6. If
SQ pin is tied low, the activity on DO pin is much reduced
as shown in Figure 7.
Figure 7. Data Out Pin with Squelch (VSQ = 0V)
August 19, 2015 11 Revision 2.0
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet MICRF220.PDF ] | |
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