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| Preliminary 4 Typical Applications * GSM Handsets * CDMA Handsets * TDMA Handsets * IF or RF Buffer Amplifiers RF2371 3V LOW NOISE AMPLIFIER * Driver Stage for Power Amplifiers * Oscillator Loop Amplifiers Product Description The RF2371 is a general purpose, low-cost, high performance low noise amplifier designed for operation from a 2.7V to 4V supply with low current consumption. The attenuation of the device is controlled when in power down mode, providing a known gain step. The RF2371 is available in a small industry-standard SOT23-8 surface mount package, enabling compact designs which conserve board space. The design features a highly accurate PTAT (Proportional To Absolute Temperature) biasing scheme using bandgap cells. 1.59 1.61 0.365 0.15 0.05 4 GENERAL PURPOSE AMPLIFIERS 0.127 TEXT* 2.80 3.00 0.650 2.60 3.00 *When Pin 1 is in upper left, text reads downward (as shown). 3MAX 0MIN 1.44 1.04 0.35 0.55 Optimum Technology Matching(R) Applied Package Style: SOT23-8 uSi Bi-CMOS Si BJT GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * 700MHz to 2000MHz Operation * 2.7V to 3.6V Single Supply * +5dBm Input IP3 at 3.0mA * 12dB Gain at 1950MHz * 1.8dB Noise Figure at 1950MHz * 17dB Gain Step RF IN 1 8 7 6 Bias Circuits 5 RF OUT ISET VCC ENABLE GND1 2 GND2 3 IPSET 4 Ordering Information RF2371 RF2371 PCBA 3V Low Noise Amplifier Fully Assembled Evaluation Board Functional Block Diagram RF Micro Devices, Inc. 7625 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev A2 010205 4-221 RF2371 Absolute Maximum Ratings Parameter Supply Voltage Supply Current Operating Ambient Temperature Storage Temperature Preliminary Rating 4.0 20 -40 to +85 -40 to +150 Unit V mA 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 Specification Min. Typ. Max. Unit Condition T=27 C, VCC =2.7V, VISELECT =0V, VENABLE =2.7V 4 GENERAL PURPOSE AMPLIFIERS Overall Frequency Range 700 to 2000 10.5 +4 12.5 1.6 +6 -14 5:1 1.5:1 -5.0 17 1.6 0 CMOS Low CMOS High 1 CMOS High CMOS Low 1 2.7 to 3.6 2.9 MHz LNA Performance Gain Noise Figure Input IP3 Input P1dB Input VSWR Output VSWR Off Mode Gain Gain Noise Figure Input IP3 dB dB dBm dBm dB dB dB dB dB dBm V V A V V A V mA A Freq=1.95GHz At 2.9mA (Noise match) VENABLE =0V Freq=836MHz Current Control Internal Current Setting "ON" External Current Setting "ON" Current into ISELECT Voltage on ISELECT Voltage on ISELECT VISELECT =2.7V Voltage on ENABLE Voltage on ENABLE VENABLE =2.7V Power Control Power "ON" Voltage Power "OFF" Voltage Current into ENABLE Power Supply Operating Voltage Operating Current Leakage Current 5 1 VCC =2.7V, Internal current setting VENABLE =0V 4-222 Rev A2 010205 Preliminary Pin 1 2 3 4 5 6 7 8 Function RF IN GND1 GND2 IPSET ENABLE VCC ISET RF OUT Description RF input pin. This pin is not internally DC blocked and requires an external blocking capacitor. Ground connection for the LNA. Keep traces physically short and connect immediately to ground plane for best performance. Ground connection for the bias circuits. This pin selects the internal current setting when CMOS level "low", and the external current setting when this pin is CMOS level "high". Power down control. This is a CMOS input. When this pin is CMOS "high" the device is enabled. When the level is CMOS "low" the device is shut off and a controlled attenuator is turned on. Power supply for the bias circuits. This pin sets the current for the device. RF output pin. Bias for the LNA is provided through this pin, hence it should be connected to VCC through an inductor. RF2371 Interface Schematic 4 GENERAL PURPOSE AMPLIFIERS Rev A2 010205 4-223 RF2371 Application Information Preliminary The RF2371 may be configured to use either the internal current setting or the external current setting. This choice is made by asserting IPSET, pin 4, to CMOS level "low" for the internal current setting or CMOS level "high" for the external current setting. Internal Current Setting When IPSET is set to CMOS "low", the internal current settings are chosen. This current draw is typically 2.9mA. In this mode, the resistorR1 may be removed from the evaluation board schematic and ISET left floating. The condition for optimal IP3 is to use the internal current setting option and leave the ISET pin open (no connect). 4 GENERAL PURPOSE AMPLIFIERS External Current Setting The external current setting is configured by using the series resistor between ISET, pin7, and ground (refer to resistor R1 in evaluation board schematic). The value of the resistor may be changed to permit various operating currents up to a maximum allowable current of 20mA. The table below gives approximate minimum R1 values to allow the 20mA maximum current draw at various operating voltages. Note: When the internal current setting was selected, the part tested drew 4.4mA, which is higher than typical (2.9mA). Thus values of R1 given vary from part to part. VCC (V) Resistor R1 () Current Draw (mA) 2.7 2.4k 20.1 3.0 2.7k 20.1 3.3 3.0k 20.0 3.6 3.3k 19.8 4-224 Rev A2 010205 Preliminary Application Schematic 1.95GHz VCC RF2371 22 nF RF IN 10 nF 1 2 3 Bias Circuits IPSET 4 5 8 3.3 nH 1.5 pF RF OUT 1k 7 VCC 6 ENABLE 4 GENERAL PURPOSE AMPLIFIERS Application Schematic 836MHz VCC 22 nF RF IN 82 nH 1 2 3 Bias Circuits IPSET 4 5 8 18 nH 1 pF RF OUT 1k 7 VCC 6 ENABLE Rev A2 010205 4-225 RF2371 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) Preliminary VCC J2 LNA INPUT C1 22 nF 1 L2 10 nH 2 3 Bias Circuits 8 7 6 5 L1 3.9 nH C2 1.5 pF J1 LNA OUTPU 4 GENERAL PURPOSE AMPLIFIERS IPSET R1 1k VCC ENABLE 4 2371400- IPSET ENABLE VCC P1 1 2 VCC ENABLE IPSET + ENVCC - 2.6 V C3 1 nF C4 1 uF + C5 22 nF + VCC 2.7 V 3 GND 4 CON4 4-226 Rev A2 010205 Preliminary Evaluation Board Layout Board Size 0.833" x 1.009" Board Thickness 0.031", Board Material FR-4 RF2371 4 GENERAL PURPOSE AMPLIFIERS Rev A2 010205 4-227 RF2371 Preliminary 4 GENERAL PURPOSE AMPLIFIERS 4-228 Rev A2 010205 |
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