Overview
The LMV225SD is a part of the LMV225, LMV226, and LMV228 series of RF power detectors designed by Texas Instruments (formerly National Semiconductor). These detectors are specifically intended for use in CDMA and WCDMA applications. The LMV225SD operates within a wide RF frequency range from 450 MHz to 2000 MHz, making it versatile for various wireless communication systems.
The device features an integrated filter for low-ripple average power detection of CDMA signals, with a dynamic range of 30 dB. It also includes accurate temperature compensation and logic low shutdown capabilities, enhancing its reliability and efficiency.
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, Output Loaded with 10 pF | 4.5 | μs | ||
| Output Voltage (No RF Input Power Present) | 214 | 350 | mV | ||
| Output Impedance (No RF Input Power Present) | 19.8 | 29 | 34 | kΩ |
Key Features
- Multi-band operation from 450 MHz to 2000 MHz, suitable for CDMA and WCDMA applications.
- Integrated filter for low-ripple average power detection of CDMA signals with a dynamic range of 30 dB.
- Accurate temperature compensation to ensure stable output voltage across various temperatures.
- Logic low shutdown capability to reduce power consumption when not in use.
- Single supply operation from 2.7V to 5.5V, enhancing flexibility in system design.
- Compact package options including DSBGA Thin, DSBGA Ultra Thin, and WSON, suitable for space-constrained designs.
Applications
- CDMA and WCDMA wireless communication systems.
- Base stations and repeaters.
- Handheld devices and mobile phones.
- RF power monitoring and control systems.
- Wireless infrastructure equipment.
Q & A
- What is the RF frequency range of the LMV225SD?
The LMV225SD operates within an RF frequency range of 450 MHz to 2000 MHz.
- What is the input power range of the LMV225SD?
The input power range of the LMV225SD is from -30 dBm to 0 dBm.
- What is the supply voltage range for the LMV225SD?
The LMV225SD can operate with a single supply voltage from 2.7V to 5.5V.
- Does the LMV225SD have built-in temperature compensation?
Yes, the LMV225SD features accurate temperature compensation to ensure stable output voltage across various temperatures.
- What are the package options available for the LMV225SD?
The LMV225SD is available in DSBGA Thin, DSBGA Ultra Thin, and WSON packages.
- How does the logic low shutdown feature work?
The logic low shutdown feature allows the device to enter a low-power state when the EN pin is set to logic low, reducing power consumption.
- What is the typical turn-on time for the LMV225SD?
The typical turn-on time for the LMV225SD is 2.1 μs.
- What is the output impedance of the LMV225SD?
The output impedance of the LMV225SD is between 19.8 kΩ and 34 kΩ when no RF input power is present.
- Is the LMV225SD suitable for handheld devices?
Yes, the LMV225SD is suitable for handheld devices due to its compact package options and low power consumption.
- What are some common applications of the LMV225SD?
The LMV225SD is commonly used in CDMA and WCDMA wireless communication systems, base stations, repeaters, and other wireless infrastructure equipment.
