AD8319ACPZ Analog Devices ADI 8-VFDFN Demodulating Logarithmic Amplifier

Product Specification

Functions

• Demodulating Log - Amplifier: The AD8319ACPZ is a demodulating logarithmic amplifier. It can accurately convert an RF input signal into a corresponding decibel - scaled output.
• It adopts the progressive compression technique in the cascaded amplifier chain, and each stage of the amplifier chain is equipped with a detector cell.
• Wide - frequency Operation: It can maintain accurate log conformance for signals in the range of 1 MHz to 8 GHz, and can be used up to 10 GHz.
• Large Dynamic Range: The input dynamic range is typically 40 dB (relative to 50 Ω), with an error of less than ±1 dB.
• Fast Response: It has a response time of 8 ns/10 ns (fall time/rise time), which can realize the detection of RF bursts with a pulse rate of more than 50 MHz.
• Stable Logarithmic Intercept: It has excellent logarithmic intercept stability under different ambient temperature conditions.
• Dual - mode Operation: The device can be used in either measurement or controller modes. When used in the controller mode, it can provide a control voltage to the power amplifier. When used in the measurement mode, the output voltage is a linear - in - dB decreasing function of the RF input signal amplitude.
• Low - noise Output: Special attention has been paid to minimizing wide - band noise, so the output can be used for controller applications.
• The AD8319 provides an output capability of 0 V to (V_{POS}−0.1 V) at the VOUT pin, which is suitable for controller applications.
• Low - power Consumption: It requires a power supply of 3.0 V to 5.5 V, and the typical current consumption is 22 mA. When disabled, the current consumption drops to 200 μA.
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Applications

• RF Transmitter PA Control: It can be used for set - point control and level monitoring of RF transmitter power amplifiers, helping to ensure the stable operation of power amplifiers and the accuracy of output power.
• Radiolink Transmitter Power Monitoring: In radiolink transmitters, it is used to monitor the power of the transmitted signal to ensure that the transmission power meets the requirements and to detect possible power - related faults.
• RSSI Measurement: It is applicable to RSSI (Received Signal Strength Indicator) measurement in base stations, WLANs, WiMAX, and radars, which is of great significance for signal quality evaluation, link quality monitoring, and resource allocation.
• RF Burst Detection: Due to its fast response characteristics, it can be used to detect fast RF bursts, which is useful in some applications requiring rapid detection of RF pulse signals, such as certain radar systems and short - burst communication systems.

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