MAX4002EUA+

The MAX4002EUA+ is one member of the MAX4002 series.The MAX4002 low-cost, low-power logarithmic amplifiers are designed to control RF power amplifiers (PA) operating in the 0.1GHz to 2.5GHz frequency range. A typical dynamic range of 45dB makes this family of log amps useful in a variety of wireless applications including cellular handset PA control, transmitter power measurement, and RSSI for terminal devices.

Features of the MAX4002EUA+ are:(1)complete RF-detecting PA controllers; (2)frequency range from 100MHz to 2.5GHz; (3)temperature stable linear-in-dB Response; (4)fast response: 70ns 10db step; (5)10mA output sourcing capability; (6)low power: 17mW at 3V (typ); (7)shutdown current 30A (max); (8)available in an 8-bump UCSP and a Small 8-pinMAX Package.The input signal for the MAX4000 is internally AC-coupled using an on-chip 5pF capacitor in series with a 2k input resistance. This highpass coupling, with a corner at 16MHz, sets the lowest operating frequency and allows the input signal source to be DC grounded.

The absolute maximum ratings of the MAX4002EUA+ can be summarized as:(1)storage temperature:-65 to 150;(2)Vcc:-0.3 to 6V;(3)equivalent voltage:2.0V;(4)operating temperature:-40 to 85;(5)power dissipation:379mW.Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.A portion of the PA output power is coupled to RFIN of the log amp controller, and is applied to the log amp strip. Each detector cell outputs a rectified current and all cell currents are summed and form a logarithmic output. The detected output is applied to a high-gain gm stage, which is buffered and then applied to OUT.OUT of MAX4002EUA+ is applied to the gain-control pin of the PA to close the control loop. The voltage applied to SET determines the output power of the PA in the control loop.