Overview
The LMH2120UMX/NOPB, produced by Texas Instruments, is a 6 GHz Linear RMS Power Detector designed for accurate power measurement of modulated RF signals. This device is particularly suited for applications where signals exhibit large peak-to-average ratios (PARs), such as in LTE and W-CDMA systems. The LMH2120 offers a linear-in-voltage response over a 40 dB dynamic range, making it ideal for multi-band and multi-mode RF power control.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| RF Frequency Range | 50 MHz | 6 GHz | |||
| Dynamic Range | -35 dBm | 5 dBm | |||
| Supply Voltage | 2.7 V | 5 V | |||
| Supply Current (Active) | EN = High, no signal | 3.5 mA | 2.9 mA | 4.0 mA | |
| Supply Current (Shutdown) | EN = Low, no signal | 5.7 µA | |||
| Input Resistance | 44 Ω | 50 Ω | 56 Ω | ||
| Output Resistance | EN = High, RFIN = -10 dBm, 1900 MHz | 1 Ω | 2 Ω | 3 Ω | |
| Linear Slope | 1 dB/dB | ||||
| Linear Intercept | VOUT = 0 dBV | -2.2 dBm | -1.8 dBm | -1.4 dBm |
Key Features
- Linear Root Mean Square (RMS) response over a 40 dB dynamic range.
- Multi-band operation from 50 MHz to 6 GHz.
- Highly temperature-insensitive and modulation-independent response.
- Minimal slope and intercept variation.
- Shutdown functionality for low power consumption.
- Tiny 6-bump DSBGA package.
- Wide supply range from 2.7V to 5V.
- High power supply rejection ratio (PSRR).
Applications
- Multi-mode, multi-band RF power control in GSM/EDGE, CDMA/CDMA2000, W-CDMA, OFDMA, and LTE systems.
- Infrastructure RF power control.
- Use in combination with directional couplers or resistive dividers.
Q & A
- What is the RF frequency range of the LMH2120?
The LMH2120 operates over an RF frequency range from 50 MHz to 6 GHz.
- What is the dynamic range of the LMH2120?
The dynamic range of the LMH2120 is from -35 dBm to 5 dBm.
- What is the supply voltage range for the LMH2120?
The supply voltage range is from 2.7V to 5V.
- How does the LMH2120 handle temperature variations?
The LMH2120 is highly temperature-insensitive, ensuring consistent performance across a wide temperature range.
- What is the purpose of the shutdown functionality in the LMH2120?
The shutdown functionality reduces power consumption when the device is not in use.
- What package type is the LMH2120 available in?
The LMH2120 is available in a tiny 6-bump DSBGA package.
- What are some common applications of the LMH2120?
Common applications include multi-mode, multi-band RF power control in various wireless communication systems and infrastructure RF power control.
- How does the LMH2120 handle modulated RF signals?
The LMH2120 provides a modulation-independent response, making it suitable for measuring modulated RF signals with large peak-to-average ratios.
- What is the input resistance of the LMH2120?
The input resistance is typically 50 Ω.
- What is the output resistance of the LMH2120?
The output resistance is typically 2 Ω when EN = High and RFIN = -10 dBm at 1900 MHz.
