AD8315

50 dB GSM PA Controller

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Product Details

The AD8315 is a complete low cost subsystem for the precise control of RF power amplifiers operating in the frequency range 0.1 GHz to 2.5 GHz and over a typical dynamic range of 50 dB. It is intended for use in cellular handsets and other batteryoperated wireless devices. The log amp technique provides a much wider measurement range and better accuracy than controllers using diode detectors. In particular, the temperature stability is excellent over a specified range of −30°C to +85°C.

Its high sensitivity allows control at low signal levels, thus reducing the amount of power that must be coupled to the detector.

For convenience, the signal is internally ac-coupled. This high-pass coupling, with a corner at approximately 0.016 GHz, determines the lowest operating frequency. Therefore, the source can be dc grounded.

The AD8315 provides a voltage output, VAPC, that has the voltage range and current drive to directly connect to most handset power amplifiers’ gain control pin. VAPC can swing from 250 mV above ground to within 200 mV below the supply voltage. Load currents of up to 6 mA can be supported.

The setpoint control input is applied to the VSET pin and has an operating range of 0.25 V to 1.4 V. The associated circuit determines the slope and intercept of the linear-in-dB measurement system; these are nominally 23 mV/dB and −60 dBm for a 50 Ω termination (−73 dBV) at 0.9 GHz. Further simplifying the application of the AD8315, the input resistance of the setpoint interface is over 100 MΩ, and the bias current is typically 0.5 μA.

The AD8315 is available in MSOP and LFCSP packages and consumes 8.5 mA from a 2.7 V to 5.5 V supply. When powered down, the sleep current is 4 μA.

Applications

  • Single, dual, and triple band mobile handset (GSM, DCS, EDGE)
  • Transmitter power control

Product Lifecycle

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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits

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EVAL-AD8315

Product Details

AD8315ACP-EVAL is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 2.7V to 5V/15 mA power supply. The power supply should be connected to the vector pins leads labeled VPOS and GND. The RF input signal is applied to the edge-mounted SMA type RF connector (RFIN). The setpoint input signal is applied to the edge-mounted SMA type connector (VSET). The detector output signal is accessible via the edge-mounted SMA connector (VAPC ). The circuit board can accommodate configuration in controller mode and a quasi-measurement mode (via an op-amp feedback loop) depending on the status the jumpers (LK1, LK2).

AD8315-EVAL is a fully populated, 4-layer, FR4-based evaluation board. For normal operation, it requires a 2.7V to 5V/15 mA power supply. The power supply should be connected to the vector pins leads labeled VPOS and GND. The RF input signal is applied to the edge-mounted SMA type RF connector (RFIN). The setpoint input signal is applied to the edge-mounted SMA type connector (VSET). The detector output signal is accessible via the edge-mounted SMA connector (VAPC ). The circuit board can accommodate configuration in controller mode and a quasi-measurement mode (via an op-amp feedback loop) depending on the status the jumpers (LK1, LK2).

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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.

AD8315 Material Declaration
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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.