SC1889

Adaptive RF Power Amplifier Linearizer with Dual RMS Power Measurement Unit

Industry's First Fully Adaptive RF PA Linearization Technology in a Single IC

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Overview

SC1889 (PC = 00): RFPAL
- RFin/RFout PA Linearizer SoC in Standard CMOS
- Fully Adaptive Compensation
- Low Power Consumption:
  - Duty Cycled (9%) Feedback: 420mW
  - Full Adaptation: 1.06W
- Frequency Range: 698MHz to 2800MHz
- Input Signal Bandwidth: Up to 60MHz
- Up to 28dB ACLR and 38dB IMD Improvement
- Packaged in 9mm x 9mm QFN Package
- Operating Case Temperature: -40°C to +100°C
- Fully RoHS Compliant, Green Materials
- Pin Compatible with SC1887 and SC1869
SC1889 (PC = 11): RFPAL + PMU (Optional)
- Dual RMS Power Detection Unit (RFIN and RFFB)
  - 30dB of Dynamic Range
  - ±0.10dB Typical Accuracy (Top 20dB)
  - ±0.50dB Typical Accuracy (Bottom 10dB)
- Frequency Range: 698MHz to 2200MHz

The SC1889 is part of the 2nd generation RF PA linearizer (RFPAL) family providing increased ACLR correction over the previous generation as well as support for EVDO, TD-SCDMA, WiMAX, HSDPA, FDD-LTE, and TD-LTE waveforms. The SC1889 is a fully-adaptive, RFin/RFout predistortion linearization solution that precisely compensates RF power amplifier (PA) non-linearities including AM/AM and AM/PM distortion, spectral regrowth, memory effects and other system level impairments.

The SC1889 substantially increases the final stage PA efficiency by reducing out-of-band energy. The SC1889 is a complete system-on-chip (SoC) solution optimized for Class A/AB and Doherty RF power amplifiers operating at a power level of 5W to 60W (RMS). The SC1889 measures the feedback signal from the power amplifier output, and optimizes the correction function by minimizing distortion. SC1889 correction function is generated using RF-domain analog signal processing allowing the SC1889 to operate over a wide bandwidth at very low power consumption.

The data sheet for the SC1889 PMU product variant is available for download.

Note: All SCxx parts are RoHS. An appended “E” at the end of the part number indicates 7” Tape and Reel. No appended letter or a “K” at the end of the part number indicates bulk.

Applications

Cellular Infrastructure
Wide Range of PAs and Output Power

Documentation

Data Sheet 1

SC1889: Adaptive RF Power Amplifier Linearizer with Dual RMS Power Measurement Unit Data Sheet (Rev.0) 07/30/2014

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Low-Noise Amplifiers (LNAs) & Power Amplifiers 1
SC1894	RECOMMENDED FOR NEW DESIGNS	225MHz to 3800MHz RF Power Amplifier Linearizer (RFPAL)

Evaluation Kits

USB-to-SPI Interface Adapter

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Features and Benefits

Provides Easy Connectivity to the SC18XX Interface from a USB Device
Allows Use of One Instance of the SC18XX GUI
No External Power Supply Required

Product Details

SC-USB-SPI is an adapter used for converting a computer’s USB interface connection to the serial parallel interface (SPI) used by the SC18XX. Only two connections are required for use with the SC18XX and no external power supply is required. The USB connection from the host computer is made through a standard USB 2.0 cable and connects to the USB-B female connector, J3, on SC-USB-SPI. The interface connection between circuit assembly containing the SC18XX and the USB-SPI adapter is through J2.

This adapter can only be used to run one instance of the SC18XX GUI at a time. Conflicts will occur when running multiple SC18XX GUIs trying to open the same SPI communication pipe.