Overview
The LMV225SDX/NOPB, produced by Texas Instruments, is a high-performance RF power detector designed for use in CDMA and WCDMA applications. This device is part of the LMV225, LMV226, and LMV228 family, each with slightly different specifications tailored to various RF power detection needs. The LMV225 is particularly suited for direct use in combination with resistive taps, offering a detection range from –30 dBm to 0 dBm.
The device operates with a single supply voltage ranging from 2.7V to 5.5V and supports multi-band operation from 450 MHz to 2000 MHz. It features accurate temperature compensation and an integrated filter for low-ripple average power detection of CDMA signals.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Supply Voltage (VDD - GND) | 2.7 | 5.5 | V | ||
| RF Frequency Range | 450 MHz | 2000 MHz | |||
| Input Power Range | –30 dBm | 0 dBm | |||
| Supply Current (Active Mode) | RFIN/EN = VDD, No RF Input Power | 4.8 | 7 | 8 | mA |
| Supply Current (Shutdown Mode) | RFIN/EN = GND, No RF Input Power | 0.44 | 4.5 | μA | |
| Turn-on-Time | No RF Input Power Present | 2.1 | μs | ||
| Rise Time | Step from no Power to 0 dBm Applied | 4.5 | μs | ||
| Output Voltage Range | No RF Input Power Present | 222 | 400 | mV | |
| Output Impedance | No RF Input Power Present | 23.7 | 31 | kΩ |
Key Features
- Multi-band operation from 450 MHz to 2000 MHz, making it versatile for various RF applications.
- Accurate temperature compensation to ensure stable output voltage across different temperatures.
- Integrated filter for low-ripple average power detection of CDMA signals with a dynamic range of 30 dB.
- Single supply voltage operation from 2.7V to 5.5V, enhancing flexibility in system design.
- Logic low shutdown feature to minimize power consumption when not in use.
- Available in multiple package options including DSBGA Thin, DSBGA Ultra Thin, and WSON, catering to different space and thermal requirements.
Applications
- CDMA and WCDMA base stations and handsets.
- RF power monitoring in wireless communication systems.
- Automated test equipment (ATE) for RF signal analysis.
- Wireless local area networks (WLAN) and other RF-based communication systems.
- Industrial and medical devices requiring precise RF power detection.
Q & A
- What is the operating frequency range of the LMV225?
The LMV225 operates within a frequency range of 450 MHz to 2000 MHz.
- What is the input power detection range of the LMV225?
The LMV225 can detect input powers ranging from –30 dBm to 0 dBm.
- What is the supply voltage range for the LMV225?
The device operates with a single supply voltage from 2.7V to 5.5V.
- Does the LMV225 have built-in temperature compensation?
Yes, the LMV225 features accurate temperature compensation to ensure stable output voltage.
- What are the available package options for the LMV225?
The LMV225 is available in DSBGA Thin, DSBGA Ultra Thin, and WSON packages.
- How does the logic low shutdown feature work?
The device can be shut down by setting the RFIN/EN pin to logic low, significantly reducing power consumption.
- What is the typical turn-on time for the LMV225?
The typical turn-on time is 2.1 μs.
- What is the output impedance of the LMV225?
The output impedance is typically between 23.7 kΩ and 31 kΩ.
- Does the LMV225 have ESD protection?
The device has limited built-in ESD protection and requires careful handling to prevent electrostatic damage.
- What are some common applications of the LMV225?
Common applications include CDMA and WCDMA base stations, RF power monitoring, and automated test equipment.
