RM912 CONEXANT | Alldatasheet
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2000, Conexant Systems, Inc. All Rights Reserved. August 2000 RM912 CDMA/AMPS 3–4 Volt Power Amplifier (824–849 MHz) The RM912 dual mode Code Division Multiple Access (CDMA)/Advanced Mobile Phone Service (AMPS) Power Amplifier is a fully matched 6-pin LCC surface mount module designed for mobile units operating in the 824-849 MHz cellular bandwidth. This device meets stringent IS95 CDMA linearity requirements to beyond 28 dBm output power and can be driven to power output levels beyond 31 dBm for high efficiency FM mode operation. A single GaAs Microwave Monolithic Intergrated Circuit (MMIC) contains all active circuitry in the module. The MMIC contains on-board bias circuitry, as well as input and interstage matching circuits. The output match is realized off-chip within the module package to optimize efficiency and power performance into a 50 Ω load. This device is manufactured with Conexant’s GaAs HBT process that provides for all positive voltage DC supply operation while maintaining high efficiency and good linearity. Primary bias to the RM912 can be supplied directly from a three cell nickel-cadmium, single cell lithium-ion, or other suitable battery with output in the 3-4 volt range. Power down is accomplished by setting the voltage on the low current reference pin to zero volts. No external supply side switch is needed as typical “off” leakage is a few microamperes with full primary voltage supplied from the battery. Functional Block Diagram MMIC MODULE RF Input RF Output VCC1 GND GND VCC2VREF Driver Stage Bias Power Stage Bias Input Match DA Inter Stage Match PA Output Match (6, 7) (3) (2) (5) (1) (4) (6, 7) Distinguishing Features Low voltage positive bias supply Good linearity High efficiency Dual mode operation Large dynamic range 6-pin LCC package (6 x 6 x 1.5 mm) Power down control
Applications
Digital cellular (CDMA) Analog cellular (AMPS) Wireless local loop
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performance of the RM912 Power Amplifier over the recommended operating conditions. Table 1. Absolute Maximum Ratings(1) (1) No damage assuming only one parameter is set at limit at a time with all other parameters set at or below nominal value. Table 2. Recommended Operating Conditions
Table 3. Electrical Specifications for CDMA / AMPS Nominal Operating Conditions(1) (1) Vcc = +3.4 V, Vref = +3.0 V, Freq = 836.5 MHz, Tc = 25 °C, unless otherwise specified. (2) ACP is specified per IS95 as the ratio of the total in-band power (1.23 MHz BW) to adjacent power in a 30 kHz BW.
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Table 4. Electrical Specifications Limits for CDMA / AMPS Recommended Operating Conditions(1) (2) ACP is specified per IS95 as the ratio of the total in-band power (1.23 MHz BW) to adjacent power in a 30 kHz BW.
Figures 5 through 8 illustrate the analog characteristics of the RM912. Figure 1. Digital Gain vs. Output Power
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Figure 2. Digital Adjacent Channel Power Magnitude (ACP1) vs. Output Power Figure 3. Digital Adjacent Channel Power Magnitude (ACP2) vs. Output Power
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Figure 6. Analog Power Added Efficiency vs. Output Power Figure 7. Analog Second Order Harmonic Suppression Magnitude
Figure 8. Analog Third Order Harmonic Suppression Magnitude
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Figure 9. Digital Gain vs. Output Power Figure 10. Digital Adjacent Channel Power Magnitude (ACP1) vs. Output Power
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Figure 13. Analog Second Order Harmonic Suppression Magnitude Figure 14. Analog Third Order Harmonic Suppression Magnitude
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to 849 MHz range. Figure 18 illustrates the board layout. Figure 17. Evaluation Board Schematic Figure 18. Evaluation Board Assembly Diagram
surface mount solder attachment to a printed circuit board. Figure 19. RM912 Package Drawing
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Table 5. Pin Description
1 VCC1(1)
2 RF Input
4 VCC2
7 GND
(1) All supply pins may be connected together at the supply. (2) Package underside is GND. Figure 20. Typical Case Markings
Figure 21. 6 x 6 Tape and Reel
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pins marked > 2000 V pass 2000V ESD stress. fails devices as soon as the pin begins to show any degradation on a curve tracer. listed in Table 6 be used in the product assembly and test areas follow. Figure 22. ESD Sensitivity Areas
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Table 6. Precautions for GaAs ICs with ESD Thresholds Greater Than 200V But Less Than 2000V
Information in this document is provided in connection with Conexant Systems, Inc. ( “Conexant”) products. These materials are provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever fo r conflicts or incompatibilities arising from future changes to its specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Exce pt as provided in Conexant’s Terms and Conditions of Sale for such products, Conexant assumes no liability whatsoever. THESE MATERIALS ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, RELATING TO SALE AND/OR USE OF CONEXANT PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, CONSEQUENTIAL OR INCIDENTIAL DAMAGES, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. CONEXANT FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. CONEXANT SHALL NOT BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENT AL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS, WHICH MAY RESULT FROM THE USE OF THESE MATERIALS. Conexant products are not intended for use in medical, life saving or life sustaining applications. Conexant customers using or selling Conexant products for use in such applications do so at their own risk and agree to fully indemnify Conexant for any damages resulting from such improper use or sale. The following are trademarks of Conexant Systems, Inc.: Conexant ™ , the Conexant C™ symbol, and “What’s Next in Communications Technologies”™ . Product names or services listed in this publication are for identification purposes only, and may be trademarks of third parties. Third-party brands and names are the property of their respective owners. For additional disclaimer information, please consult Conexant ’s disclaimer information posted at www.conexant.com which is incorporated by reference. Reader Response: Conexant strives to produce quality documentation and welcomes your feedback. Please send comments and suggestions to conexant.tech.pubs@conexant.com. For technical questions, contact your local Conexant sales office or field applications engineer.
Ordering Information
Revision History
Model Number Manufacturing Part Number Product Revision Package Operating Temperature — RM912 –14 6x6LM –6 –30 °C to +85 °C Revision Level Date Description A March 2000 Preliminary Information B March 2000 Updated Preliminary Information C June 2000 Added Characterization Data, Released D July 2000 Updated ESD Data E July 2000 Preprint Update F August 2000 Web Site Update G August 2000 Web Format Corrections
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