NJM2278
300/400MHz Band 20mW Power Amplifier
!
GENERAL DESCRIPTION
The
NJM2278
is a narrow band, small signal amplifier, especially
designed for use as the final RF amplifier in 300MHz / 400MHz
band transmitter. The amplifier produces an output power of up to
20mW at the desired frequency, which frequency and power are
adjusted by external input and output matching circuits. It also
features excellent thermal stability of power gain.
!
PACKAGE OUTLINE
NJM2278F1
!
APPLICATIONS
300/400MHz Band Applications, 400MHz Industrial Radios, Digital Communication Systems
!
FEATURES
(@400MHz, 2.7V)
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Low Operating Voltage
2V to 5.5V
Low Operating Current
20 mA @ 0dBm input
Power Gain
17dB @ - 30dBm input
13dB @0dBm input
Saturation Output
14dBm @3dBm input
Variable Power Gain Control
4dB
Excellent Power Gain Thermal Stability
Gain Flatness ±1dB
(- 40°C to + 85°C)
RF IN Input Impedance
70
Ω
RF OUT Output Impedance 110
Ω
Recommended Operating Frequency 300MHz to 500MHz
Bipolar Technology
Package Outline
SOT23-6 (MTP6) 2.8mm x 2.9mm
Note: For the signals at frequencies other than recommended operating frequency range of 300 to 500MHz,
please refer to the “TYPICAL CHARACTERISTICS”.
Orientation Mark
!
PIN CONFIGULATION
1
2
3
6
5
4
Top View
Pin Function
1. RF IN
2. GND
3. EMI
4. RF OUT
5. V+
6. IREF
!
Function Block Diagram
RF IN
1
GND
2
EMI
3
Bias
Regulator
IREF
6
V+
5
RF OUT
4
Ver.2008-08-22
-1-
NJM2278
!
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
V+
P
D
Pinmax
Ta
Tstg
(Ta=25°C)
RATINGS
6.5
200
6
- 40 to + 85
- 40 to +125
UNIT
V
mW
dBm
°C
°C
Supply Voltage
Power Dissipation
RF Input Level
Operating Temperature
Storage Temperature
!
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL
V+
(Ta=25°C)
MIN.
2.0
TEST CONDITIONS
TYP.
2.7
MAX.
5.5
UNIT
V
Supply Voltage
!
ELECTRICAL CHARACTERISTICS
PARAMETER
(Ta=25°C, V
+
=2.7V, fin=400MHz, Pin=0dBm unless otherwise noted)
SYMBOL
I c c1
Icc2
PG1
PG2
PGsat
NF
l S 11l
2
l S 22l
2
ISL
P–1dB
Zin
Z out
PGfreq
PGrang
TEST CONDITIONS
No signal, Test circuit1
Test circuit1
Pin= - 30dBm,Test circuit1
Pin= 0dBm, Test circuit1
Pin= 3dBm, Test circuit1
Test Circuit2
Test Circuit3
Test Circuit3
Test Circuit3
Test Circuit1
Test Circuit3
Test Circuit3
fin =300 to 500MHz
400MHz standard
Test Circuit3
Rref=0 to 100Ω
Test Circuit4
MIN.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
TYP.
6
20
17.5
13.5
14.5
3
-13
-5
- 27
-9
70
110
- 2.8
- 4.3
MAX.
-
24
-
-
-
-
-
-
-
-
-
-
-
-
UNIT
mA
mA
dB
dB
dBm
dB
dB
dB
dB
dBm
Ω
Ω
dB
dB
Operating Current 1
Operating Current 2
Power Gain 1
Power Gain 2
Saturation Output
Noise Figure
Input Return Loss
Output Return Loss
RF OUT - RF IN Isolation
Power Input at 1dB Compression Point
Input Impedance
Output Impedance
Gain Flatness
Gain Control Rang
!
REFERENCE (Thermal Characteristics)
PARAMETER
Gain Variation Over Temperature
SYMBOL
PG temp
TEST CONDITIONS
Ta= - 40 to 85°C
Test Circuit1
MIN.
-1
TYP.
0
MAX.
+1
UNIT
dB
Ver.2008-08-22
-2-
NJM2278
!
TEST CIRCUIT
These test circuits allow the measurement of all parameters described in “ELECTRICAL CHARACTERISTICS”.
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Test Circuit 1 for Icc1, Icc2, PG1, PG2, PGsat, P-1dB, PGtemp
V+
C7
1000p
RF IN
1
GND
2
SG
Z=50
Bias
C2
6.8p
EMI
3
Regulator
IREF
6
V+
5
RF OUT
4
11p
C4
Spectrum
4.3p
Analyzer
Z=50
C3
RF OUT
C6
1000p
L2
22n
L1
RF IN
C1
24n 1000p
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Test Circuit 2 for NF
Noise
Source
NF
Meter
V+
C7
1000p
RF IN
1
GND
2
Bias
C2
6.8p
EMI
3
Regulator
IREF
6
V+
5
RF OUT
4
11p
C4
4.3p
C3
RF OUT
C6
1000p
L2
22n
L1
RF IN
C1
24n 1000p
Ver.2008-08-22
-3-
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