RF2347 • TDMA/CDMA/FM Cellular LNA • General Purpose Amplification • Low Noise Transmit Driver Amplifier • 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. Si Bi-CMOS GaAs HBT GaAs MESFET SiGe HBT Si CMOS .006 .002 .196 .190 .016 .010 1 .120 .116 .026 .120 .036 .032 .116 10°MAX 0°MIN .027 .017 Si BJT GENERAL PURPOSE AMPLIFIERS 4 .009 .005 ! • Low Noise and High Intercept Point • Power Down Control • Single 2.5V to 6.0V Power Supply PD 1 8 GND2 • 150MHz to 2500MHz Operation NC 2 7 RF OUT • Extremely Small MSOP-8 Package RF IN 3 6 GND2 GND1 4 5 GND2 RF2347 RF2347 PCBA Rev A5 991207 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 4-163 RF2347 Absolute Maximum Ratings Parameter Supply Voltage Input RF Level Operating Ambient Temperature Storage Temperature Parameter Rating Unit -0.5 to +8.0 +10 -40 to +85 -40 to +150 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). Specification Min. Typ. Max. Unit 150 to 2500 MHz Condition Overall GENERAL PURPOSE AMPLIFIERS 4 RF Frequency Range Low Noise Amplifier 880MHz Performance Gain Schematic per LNA Application; T = 25°C, RF=880MHz 19.5 19.5 Noise Figure Input IP3 Max Input IP3 21.0 21.0 1.4 1.4 +6.0 +5.0 +7.5 +6.0 1.6 1.6 dB dB dB dB dBm dBm dBm dBm 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 = 25°C, RF=836MHz, VPD =2.8V dB dB dB dBm dBm dBm dB dB dB dB dB dB 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 dBm dBm dBm Using External LC network used on Evaluation Board VCC =3.5V VCC =3.0V VCC =2.5V T = 25 °C Driver Amplifier 836MHz Performance Gain Output IP3 19.5 19.5 19.5 25 Noise Figure Reverse Isolation Input VSWR Output VSWR P1dB 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 13 12 10.5 15.5 14.5 13 2.7 12.5 2.5 to 6.0 2.8 22 18 19 20 24 21.5 21.5 21.5 35 2.0 2.0 2.0 2.0:1 2.0:1 Power Supply Voltage (VCC) Voltage (VPD) Current Consumption Power Down 4-164 2.9 26.5 V V mA 22 29 10 mA mA µΑ 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 Rev A5 991207 RF2347 Pin 1 Function PD Description Interface Schematic For low noise amplifier applications, this pin is used to control the bias current. See plots for bias current settings. PD 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). NC RF IN No connection. This pin is typically left unconnected or grounded. 4 RF input pin. This pin is DC coupled and matched to 50Ω at 836 MHz. To Bias Circuit RF IN 4 GND1 5 6 NC GND2 7 RF OUT 8 GND2 Rev A5 991207 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 50Ω with a shunt bias/matching inductor and series blocking/matching capacitor. Refer to application schematics. See pin 6. 4-165 GENERAL PURPOSE AMPLIFIERS 2 3 RF2347 VCC 12 nH 10 nF VPD R1 1 kΩ 1 8 NC 2 7 10 nF RF OUT 2 pF 22 nF RF IN 4 GENERAL PURPOSE AMPLIFIERS 100 pF 100 pF 3 6 4 5 VCC 12 nH 10 nF VPD R1 0 kΩ 1 8 NC 2 7 4-166 10 nF RF OUT 2 pF 22 nF RF IN 100 pF 100 pF 3 6 4 5 Rev A5 991207 RF2347 !" #$ (Download Bill of Materials from www.rfmd.com.) PD J1 RF IN 50 Ω µstrip C5 100 pF C1 100 pF C3 22 pF C6 10 nF VCC 1 8 2 7 3 6 4 5 L1 12 nH 50 Ω µstrip J2 RF OUT C4 2 pF 4 GENERAL PURPOSE AMPLIFIERS R1 0Ω C2 10 nF P1 P1-1 2347400A P1-3 1 VPD 2 GND 3 VCC C7 4.7 µF !" #$ R1 1 kΩ C2 10 nF PD J1 RF IN 50 Ω µstrip C3 22 pF C5 100 pF C1 100 pF C6 10 nF VCC 1 8 2 7 3 6 4 5 L1 12 nH 50 Ω µstrip C4 2 pF J2 RF OUT P1 P1-1 2347401- P1-3 1 VPD 2 GND 3 VCC C7 4.7 µF Rev A5 991207 4-167 RF2347 !" #$%" #$&'()&'( Board Thickness 0.031”; Board Material FR-4 GENERAL PURPOSE AMPLIFIERS 4 4-168 Rev A5 991207 RF2347 RF2347 Bias Current versus Rc RF2347 Gain versus Bias Current 30 21.8 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V 25 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V 21.6 21.4 Gain (dB) 15 21.0 20.8 20.6 10 20.4 4 20.2 5 20.0 0 19.8 0 200 400 600 800 1000 1200 1400 1600 1800 2000 0.0 5.0 10.0 Rs (Ω) RF2347 Noise Figure versus Bias Current 20.0 25.0 30.0 35.0 RF2347 OIP3 versus Bias Current 33 2.0 Vcc = 2.7 V Vcc = 3.0 V Vcc = 3.3 V Vcc = 3.6 V 1.9 31 29 1.8 27 1.7 OIP3 (dBm) Noise Figure (dB) 15.0 Bias Current (mA) 1.6 25 23 2.7V OIP3 3.0V OIP3 3.3V OIP3 3.6V OIP3 1.5 21 1.4 19 1.3 17 1.2 15 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 Bias Current (mA) 0 5 10 15 20 25 30 35 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 IIP3 (dBm) 8 6 4 2 0 -2 0 5 10 15 20 25 30 35 Bias Current (mA) Rev A5 991207 4-169 GENERAL PURPOSE AMPLIFIERS Bias Current (mA) 21.2 20 RF2347 GENERAL PURPOSE AMPLIFIERS 4 4-170 Rev A5 991207