
MICRF300
100MHz to 1000MHz, 1.8 to 3.6V,
Low-Noise Amplifier with Shutdown
General Description
Features
The MICRF300 is a low-noise amplifier (LNA) with low-
power shutdown mode, which operates over the
100MHz to 1000MHz frequency band. The device is
targeted for low-power, low-data rate applications at
315/433MHz, achieving a low 1.2dB noise figure with
18dB of gain, helping to improve receiver noise figure
and sensitivity. The device also performs well at
868/915MHz, achieving 13dB of gain and a noise figure
of 1.7dB. The device requires a simple input matching
network and output matching network to optimize
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1.8V to 3.6V supply voltage range
2.5mA operating supply current
1 μ A (Max) shutdown current over temperature
18.3dB gain at 315MHz/433.92MHz
1.15dB noise figure at 315MHz/433.92MHz
-25dBm input P 1dB compression point at 433.92MHz
-40 ? C to +125 ? C operating temperature range
Small 6-pin SC70 package
performance for the desired frequency band.
Applications
The MICRF300 operates over the 1.8V to 3.6V voltage
range. Consuming a low 2.5mA of supply current during
operation and a typical 50nA of shutdown current, the
MICRF300 is an ideal solution for battery powered
equipment. The device is available in 6-pin SC70
package and is rated to operate over the -40 ? C to
+125 ? C temperature range.
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Security systems
Remote keyless entry (RKE)
Tire pressure monitoring (TPMS)
Automated meter reading (AMR)
Garage door openers (GDO)
Remote weatherstations
Typical Application Circuit
Typical Performance and Matching Component Values
f RF
(MHz)
315
433.92
900
I CC
(mA)
2.5
2.5
2.5
Gain
(dB)
18.5
18.3
13.6
NF
(dB)
1.15
1.15
1.7
IP1dB
(dBm)
-26.5
-25
-21
IIP3
(dBm)
-15
-13
-10
L1
(nH)
33
22
2.7
C1
(pF)
1000
1000
270
L2
(nH)
47
33
10
C2
(pF)
5.6
3.9
1.8
Micrel Inc. ? 2180 Fortune Drive ? San Jose, CA 95131 ? USA ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
April 2012
M9999-041712-B
RadioTech@micrel.com or (408) 944-0800