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RF2347

* TDMA/CDMA/FM Cellular LNA * Low Noise Transmit Driver Amplifier * General Purpose Amplification * Commercial and Consumer Systems

The RF2347 is a low noise amplifier with a very high dynamic range designed for digital cellular applications at 900MHz. The device functions as an outstanding front end low noise amplifier or power amplifier driver amplifier in the transmit chain of digital subscriber units where low transmit noise power is a concern. When used as an LNA, the bias current can be set externally. When used as a PA driver, the IC can operate directly from a single cell Li-ion battery and includes a power down feature that can be used to completely turn off the device. The IC is featured in a standard miniature 8-lead plastic MSOP package.
.196
4
.190
1
.006 .002
.016 .010 .026
.120 .116
.120
.116
10MAX 0MIN
.036 .032
.027 .017
.009 .005

Si BJT Si Bi-CMOS
GaAs HBT
SiGe HBT
!
GaAs MESFET Si CMOS
* Low Noise and High Intercept Point * Power Down Control * Single 2.5V to 6.0V Power Supply
PD NC RF IN GND1
1 2 3 4
8 7 6 5
GND2 RF OUT GND2 GND2
* 150MHz to 2500MHz Operation * Extremely Small MSOP-8 Package

RF2347 RF2347 PCBA 3V Low Noise Amplifier/ 3V PA Driver Amplifier Fully Assembled Evaluation Board

RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA
Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com
Rev A5 991207
4-163
GENERAL PURPOSE AMPLIFIERS
RF2347
Absolute Maximum Ratings Parameter
Supply Voltage Input RF Level Operating Ambient Temperature Storage Temperature
Rating
-0.5 to +8.0 +10 -40 to +85 -40 to +150
Unit
VDC dBm C C Caution! ESD sensitive device.
RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s).
Parameter
Overall
Specification Min. Typ. Max.
150 to 2500
Unit
MHz
Condition
4
GENERAL PURPOSE AMPLIFIERS
RF Frequency Range
Low Noise Amplifier 880MHz Performance
Gain Noise Figure Input IP3 Max Input IP3 19.5 19.5 21.0 21.0 1.4 1.4 +6.0 +5.0 +7.5 +6.0 dB dB dB dB dBm dBm dBm dBm
Schematic per LNA Application; T = 25C, RF=880MHz VCC =3.0V, ICC =11mA VCC =2.7V, ICC =11mA VCC =3.0V, ICC =11mA VCC =2.7V, ICC =11mA VCC =3.0V, ICC =11mA VCC =2.7V, ICC =11mA VCC =3.0V, ICC =20mA VCC =2.7V, ICC =20mA Schematic per Driver Amplifier Application T = 25C, RF=836MHz, VPD =2.8V VCC =3.5V VCC =3.0V VCC =2.5V VCC =3.5V VCC =3.0V VCC =2.5V VCC =3.5V VCC =3.0V VCC =2.5V VCC =3.5V VCC =3.0V VCC =2.5V Using External LC network used on Evaluation Board VCC =3.5V VCC =3.0V VCC =2.5V T = 25 C
1.6 1.6
Driver Amplifier 836MHz Performance
Gain 19.5 19.5 19.5 25 20.5 20.5 20.5 +28.5 +28.5 +27 1.4 1.4 1.3 26 26 25 1.5:1 1.25:1 15.5 14.5 13 2.5 to 6.0 2.8 22 21.5 21.5 21.5 35 dB dB dB dBm dBm dBm dB dB dB dB dB dB
Output IP3
Noise Figure
2.0 2.0 2.0
Reverse Isolation
Input VSWR Output VSWR P1dB 13 12 10.5
2.0:1 2.0:1 dBm dBm dBm V V mA
Power Supply
Voltage (VCC) Voltage (VPD) Current Consumption 2.7 12.5 2.9 26.5
18 19 Power Down
20 24
22 29 10
mA mA
VCC =3.5V; VPD =2.8 V; VPD + VCC - Current Consumption from VPD is 2.0 mA Typ. @ VPD = 2.8V and 3.0 mA Max @ VPD =2.9 V VCC =3.5V; VPD =2.7V; VPD + VCC VCC =3.5V; VPD =2.9V; VPD + VCC VCC =3.5V; VPD 0.9 V
4-164
Rev A5 991207
RF2347
Pin 1 Function PD Description
For low noise amplifier applications, this pin is used to control the bias current. See plots for bias current settings. For driver amplifier applications, this is the Power Down pin for the IC. VPD =2.8V +/- 0.1V is required for proper operation. VPD< 0.9V turns off the Part. External RF bypassing is required. The trace length between the pin and the bypass capacitors should be minimized. The ground side of the bypass capacitors should connect immediately to ground plane. Nominal current required for VPD =2.8 V is 2.0mA typical and 3.0mA Max (@ VPD =2.9V).
Interface Schematic
PD
2 3
NC RF IN
No connection. This pin is typically left unconnected or grounded. RF input pin. This pin is DC coupled and matched to 50 at 836 MHz.
4
To Bias Circuit RF IN RF OUT
4 5 6 7
GND1 NC GND2 RF OUT
Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. See pin 2. This pin is typically grounded. Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. Amplifier Output pin. This pin is an open-collector output. It must be biased to either VCC or pin 7 through a choke or matching inductor. This pin is typically matched to 50 with a shunt bias/matching inductor and series blocking/matching capacitor. Refer to application schematics. See pin 6.
8
GND2
Rev A5 991207
4-165
GENERAL PURPOSE AMPLIFIERS
RF2347

VCC 12 nH 10 nF VPD R1 1 k 22 nF RF IN 100 pF 1 NC 2 3 4 8 7 2 pF 6 5 RF OUT 100 pF 10 nF
4
GENERAL PURPOSE AMPLIFIERS

VCC 12 nH 10 nF VPD R1 0 k 22 nF RF IN 3 4 6 5 100 pF 1 NC 2 8 7 2 pF RF OUT 100 pF 10 nF
4-166
Rev A5 991207
RF2347
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#$
(Download Bill of Materials from www.rfmd.com.)
R1 0 PD
C2 10 nF
C1 100 pF 1 8 7 6 5
C5 100 pF L1 12 nH C4 2 pF
C6 10 nF VCC 50 strip
J1 RF IN
50 strip
C3 22 pF
2 3 4
J2 RF OUT
4
P1 P1-1 1 2 VPD GND VCC
2347400A
P1-3 C7 4.7 F
3
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C5 100 pF 1 C3 22 pF 2 3 4 8 7 6 5 P1-1
2347401-
R1 1 k PD
C2 10 nF
C1 100 pF
C6 10 nF VCC
L1 12 nH C4 2 pF
50 strip
J2 RF OUT
J1 RF IN
50 strip
P1 1 2 P1-3 C7 4.7 F 3 VPD GND VCC
Rev A5 991207
4-167
GENERAL PURPOSE AMPLIFIERS
RF2347
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Board Thickness 0.031"; Board Material FR-4
4
GENERAL PURPOSE AMPLIFIERS
4-168
Rev A5 991207
RF2347
RF2347 Bias Current versus Rc
30 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V 21.8 21.6 21.4 21.2 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V
RF2347 Gain versus Bias Current
25
Bias Current (mA)
20
15
Gain (dB)
21.0 20.8 20.6
10 20.4 20.2 5 20.0 0 0 200 400 600 800 1000 1200 1400 1600 1800 2000 19.8 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0
4
GENERAL PURPOSE AMPLIFIERS
Rs ()
Bias Current (mA)
RF2347 Noise Figure versus Bias Current
2.0 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V 33 31 29 27 1.7
RF2347 OIP3 versus Bias Current
1.9
1.8
Noise Figure (dB)
OIP3 (dBm)
25 23 21 2.7V OIP3 3.0V OIP3 3.3V OIP3 3.6V OIP3
1.6
1.5
1.4
19 17 15 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 0 5 10 15 20 25
1.3
1.2
30
35
Bias Current (mA)
Bias Current (mA)
RF2347 IIP3 versus Bias Current
12 Vcc=2.7V Vcc=3.0 V Vcc=3.3 V Vcc=3.6 V
10
8
IIP3 (dBm)
6
4
2
0
-2 0 5 10 15 20 25 30 35
Bias Current (mA)
Rev A5 991207
4-169
RF2347
4
GENERAL PURPOSE AMPLIFIERS
4-170
Rev A5 991207

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