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Overview
Features and Benefits
- Dual Band RF Power Amplifier Control (LTC1758-2)
- Internal Schottky Diode Detector with Improved Dynamic Range vs LTC1757A
- Wide Input Frequency Range: 850MHz to 2GHz
- Autozero Loop Cancels Offset Errors and Temperature Dependent Offsets
- Wide VIN Range: 2.7V to 6V Allows Direct Connection to Battery
- RF Output Power Set by External DAC
- 250kHz Control Loop Bandwidth
- Fast Acquire After Transmit Enable
- Internal Frequency Compensation
- Rail-to-Rail Power Control Outputs
- Power Control Signal Overvoltage Protection
- Low Operating Current: 1mA
- Very Low Shutdown Current: <1µA
- Available in 8-PIn MSOP (LTC1758-1) and 10-Pin MSOP (LTC 1758-2) Packages
- Improved Start Voltage Accuracy
- Improved PCTL Input Filtering
- Pin Compatible with LTC1757A-X
Product Details
The LTC1758-2 is a dual band RF power controller for RF power amplifiers operating in the 850MHz to 2GHz range. The loop bandwidth reduction to 250kHz improves frequency stability when controlling slow turn-on PAs such as the Philips BGY280, Conexant RM009/CX77302, Anadigics AWT6102/AWT6107 and the Hitachi PF08107/PF08123B.
The LTC1758-1 is a single output RF power controller that is identical in performance to the LTC1758-2 except that one output (VPCA) is provided. The LTC1758-1 can be used to drive a single RF or dual channel module with integral multiplexer. This part is available in an 8-pin MSOP package.
RF power is controlled by driving the RF amplifier power control pins and sensing the resultant RF output power via a directional coupler. The RF sense voltage is peak detected using an on-chip Schottky diode. This detected voltage is compared to the DAC voltage at the PCTL pin to control the output power. The RF power amplifier is protected against high supply current and high power control pin voltages.
Internal and external offsets are cancelled over temperature by an autozero control loop, allowing accurate low power programming. The shutdown feature disables the part and reduces the supply current to <1µA.
Applications
- Single and Dual Band GSM/GPRS Cellular Telephones
- PCS Devices
- Wireless Data Modems
- U.S. TDMA Cellular Phones
Product Lifecycle
Last Time Buy
All products in this family will be obsolete soon. Please contact ADI Sales or Distributors to arrange for final purchases and read our Obsolescence Information to review the time periods for placing final orders and receiving final shipments.
Documentation
Reliability Data (1)
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Discussions
LTC1758-1 Discussions
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
