MICRF001 Просмотр технического описания (PDF) - Micrel
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MICRF001 Datasheet PDF : 8 Pages
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MICRF001
QwikRadio tm
Micrel
ABSOLUTE MAXIMUM RATINGS
Operating Ratings
Supply Voltage (VDDRF, VDDBB)...................................+7V Supply Voltage (VDDRF, VDDBB)....................4.75V to 5.5V
Voltage on any I/O Pin...........................VSS-0.3 to VDD+0.3
Junction Temperature.................................................+150°C
Storage Temperature Range......................-65°C to + 150°C
Ambient Operating Temperature (TA)............-40°C to +85°C
Package Thermal Resistance θja (14 Pin DIP)..........90°C/W
Lead Temperature (soldering, 10 seconds)..............+ 300°C
This device is ESD sensitive: Meets Class 1 ESD test
requirements (Human Body Model, HBM), in accordance with
MIL-STD-883C, Method 3015. Do not operate or store near
Electrical Characteristics
strong electrostatic fields. Use appropriate ESD precautions.
Unless otherwise stated, these specifications apply for Ta=-40°C to 85°C, 4.75<VDD<5.5V. All voltages are with respect to
Ground. CAGC = CTH = .047µF, VDDRF= VDDBB = VDD. REFOSC frequency = 2.442MHz.
Parameter
Test Conditions
MIN TYP MAX UNITS
Power Supply
Operating Current
Ta= 25°C
6.3
mA
Operating Current
Reference Oscillator powered down
2
mA
RF/IF Section
Receiver Sensitivity
Note 1, 3
-95
dBm
IF Center Frequency
2.25
MHz
IF Bandwidth
Note 3
1.0
MHz
Receive Data Rate
0.1
4.8
kbps
RF Input Range
300
440
MHz
Receive Modulation Duty-Cycle
20
80
%
Maximum Receiver Input
Rs = 50Ω
-20
dBm
Spurious Reverse Isolation
ANT pin, Rs = 50Ω Note 2
30
µVrms
AGC Attack / Decay ratio
T(Attack) / T(Decay)
0.1
Oscillator Turn-on Time
0.1
s
Demod Section
CTH Source Impedance
SEL0=SEL1=VDD, See Table 1
200k
Ω
CTH Source Impedance Variation
-15
+15
%
Digital Section
REFOSC Input Impedance
200k
Ω
Input Pullup Impedance
SEL0, SEL1, SWEN
1000k
Ω
Output Current
DO pin, Push-Pull
10
µA
Output High Voltage
DO pin, Iout = 1µA
0.9VDD
V
Output Low Voltage
DO pin, Iout = 1µA
0.1VDD
V
Output Tr, Tf
DO pin, Cload=15pF
10
µsec
Note 1:
Note 2:
Note 3:
Sensitivity is defined as the average signal level measured at the input necessary to achieve 10e-2 Bit Error Rate (BER). The
input signal is defined as a return-to-zero (RZ) waveform with 50% average duty cycle at a data rate of 2400bps. The RF input
is assumed to be matched into 50Ω.
Spurious reverse isolation represents the spurious components which appear on the RF input (ANT) pin measured into 50Ω
with an input RF matching network.
Sensitivity, a commonly specified Receiver parameter, provides an indication of the Receiver’s input referred noise, generally
input thermal noise. However, it is possible for a more sensitive receiver to exhibit range performance no better than that of a
less sensitive receiver, if the “ether” noise is appreciably higher than the thermal noise. “Ether” noise refers to other interfering
“noise” sources, such as FM radio stations, pagers, etc.
A better indicator of receiver range performance is usually given by its Selectivity, often stated as Intermediate Frequency (IF)
or Radio Frequency (RF) bandwidth, depending on receiver topology. Selectivity is a measure of the rejection by the receiver
of “ether” noise. More selective receivers will almost invariably provide better range. Only when the receiver selectivity is so
high that most of the noise on the receiver input is actually thermal will the receiver demonstrate sensitivity-limited
performance.
June 1998
3
MICRF001
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