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MS5905 MS321 DVS

Addressing the need for precise transmit power control in two-way radios, professional communication equipment, and portable wireless devices, Ruimeng Technology introduces the MS2352 – a wideband, high-dynamic-range RF power detector/controller. Operating over a frequency range of 0.1GHz to 2.5GHz with a dynamic range exceeding 50dB, the MS2352 can form a closed-loop control with the power amplifier (PA), helping two-way radio systems achieve efficient and stable power output.

Typical Performance Curves

Key Advantages

01 Wide Frequency Coverage (0.1GHz – 2.5GHz)

The MS2352 covers VHF/UHF as well as the entire frequency band commonly used in professional two-way radios (e.g., 136-174MHz, 400-470MHz). A single chip can adapt to various radio designs, simplifying BOM management and reducing inventory costs.

02 High Dynamic Range (>50dB)

At 0.9GHz, the MS2352 can detect signal levels from -47.1dBm to +4.1dBm (50Ω). Whether the radio is transmitting at low or high power, the device provides accurate detection, ensuring closed‑loop control precision and avoiding output power overshoot or droop.

03 Ultra‑Low Power Design

At 2.8V supply, the MS2352 consumes only 22.7mW in active mode, and shutdown power is as low as 10.1μW. Since two‑way radios spend most of their time in standby/receive mode, disabling the detector via the ENBL pin significantly extends battery life, meeting the stringent power requirements of handheld devices. At 5V supply, active power is 53.5mW – still a reasonable level.

04 Integrated Negative Feedback Control Loop

The chip integrates a complete control loop, requiring only an external directional coupler, a DAC, and a few passive components (e.g., a 150pF–300pF capacitor on the FLTR pin) to operate. The VSET pin sets a voltage (0.23V to 1.41V) that linearly controls the PA output power, greatly simplifying the design complexity of traditional discrete solutions and accelerating time‑to‑market for radio products.

Technical Parameters

(Note: Refer to the datasheet for exact specifications.)

Typical Application: Transmit Power Control in Two‑Way Radios

In two‑way radio design, transmit power stability directly affects communication range and battery life. The MS2352 enables a closed‑loop power control system:

  • High‑Accuracy Feedback: By sampling the PA output power via a directional coupler, the MS2352 compares the detected value with the VSET reference voltage and automatically adjusts the VAPC output, keeping the PA output power stable regardless of battery voltage fluctuations or temperature changes.

  • Low Power Extends Standby Time: At 2.8V supply, power consumption is only 22.7mW; the ENBL pin allows complete shutdown (as low as 10.1μW). During standby or receive modes, the detector can be turned off entirely, significantly extending battery life.

  • Simple External Circuitry: The device integrates AC coupling capacitors; only one external resistor (52.3Ω) is needed for wideband matching, and a 150pF–300pF capacitor on the FLTR pin ensures loop stability – ideal for space‑constrained handheld radio designs.

With wide frequency coverage, >50dB dynamic range, microampere shutdown current, and minimal external components, the MS2352 provides an ideal power detection and control solution for two‑way radios and professional communication equipment.