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Texas Instruments LMV242LDX
- Part No.:
- LMV242LDX
- Manufacturer:
- Texas Instruments
- Category:
- RF Power Controller ICs
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LMV242LDX.pdf
- Description:
- IC RF PWR CNTRL PA 2GHZ 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,570
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Product details
Overview
LMV242LDX from Texas Instruments is a dual-output RF power amplifier controller IC designed for closed-loop transmit power control in GSM/GPRS mobile handsets. It integrates a 50dB logarithmic RF detector (450MHz–2GHz), ramp voltage interface (0.2V–1.8V), and two independently selectable error amplifiers driving PA1/PA2 outputs. Its shutdown mode reduces current to ≤30µA, enabling battery-efficient RX slot operation.
For engineers reviewing the LMV242LDX datasheet, LMV242LDX pinout, LMV242LDX application, or LMV242LDX equivalent, key selection criteria include its dual-channel PA control capability, temperature-compensated log detection accuracy (±1.5dB typical error over −40°C to +85°C), external loop compensation via COMP1/COMP2, GPRS compliance, and WSON-10 (3mm × 3mm) package compatibility with compact PA modules.
Technical Context
The LMV242LDX implements a dual-channel feedback architecture where RFIN feeds an internal log detector whose output current is compared against VRAMP-derived ramp current (via transconductance of 70–120µA/V) in two independent integrator-based error amplifiers. Band Select (BS) digitally routes COMP2 to either OUT1 or OUT2, enabling time-multiplexed control of two PAs in quad-band TDMA systems.
Each channel supports stable closed-loop operation across 450MHz–2GHz using user-configurable RC compensation between COMP1 and COMP2 (e.g., 68pF + 0Ω). The device operates from 2.6V–5.5V, delivers ≥10mA output short-circuit current per channel, and achieves ≤6µs turn-on time from shutdown-critical for meeting GSM burst timing masks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 450MHz to 2GHz - supports GSM900, DCS1800, PCS1900, and TD-SCDMA bands without reconfiguration |
| Log Detection Range | −50dBm to 0dBm - enables full dynamic range control of PAs delivering +25dBm to +35dBm output with standard coupler attenuation |
| VRAMP Input Range | 0.2V to 1.8V - maps linearly to PA output power in dB, simplifying baseband DAC interface and calibration |
| Supply Voltage | 2.6V to 5.5V - compatible with Li-ion battery rails and regulated 3.3V/5V system supplies |
| Shutdown Current | ≤30µA - ensures minimal quiescent drain during receive intervals, extending handset battery life |
| Operating Temperature | −40°C to +85°C - validated for industrial-grade mobile handset environments including thermal cycling |
| Package | WSON-10 (3mm × 3mm) - surface-mount footprint optimized for space-constrained PA module integration |
Pinout & Package
LMV242LDX is housed in a 10-pin WSON package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 10 is GND; pins 8 (BS) and 7 (TX_EN) are Schmitt-triggered digital inputs; pins 1 (OUT1) and 2 (OUT2) drive PA gain-control inputs; RFIN (pin 5), VRAMP (pin 6), VDD (pin 4), COMP1 (pin 9), and COMP2 (pin 3) support analog signal routing and loop compensation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT1 (Pin 1) | PA Channel 1 Output | Drives VAPC input of first power amplifier; active when BS = high; sinks/sourcing up to 31.5mA |
| OUT2 (Pin 2) | PA Channel 2 Output | Drives VAPC input of second power amplifier; active when BS = low; identical drive capability to OUT1 |
| COMP2 (Pin 3) | Compensation Node Switch | Routed by BS signal to OUT1 or OUT2; connects externally to COMP1 for RC loop stabilization |
| VDD (Pin 4) | Positive Supply | Accepts 2.6V–5.5V; powers all analog blocks and digital interface; decoupling required at pin |
| RFIN (Pin 5) | RF Detector Input | Receives coupled RF sample (50Ω terminated); DC resistance 55.7Ω; requires directional coupler interface |
| VRAMP (Pin 6) | Ramp Reference Input | Analog setpoint (0.2V–1.8V) defining target PA output power; deadband ±206mV centered at 0V |
| TX_EN (Pin 7) | Enable/Shutdown Control | Schmitt-triggered logic: high = active, low = shutdown (≤30µA IDD); controls all internal circuitry |
| BS (Pin 8) | Band Select Input | Schmitt-triggered logic: high selects OUT1, low selects OUT2; disables unselected output (pulled low) |
| COMP1 (Pin 9) | Primary Compensation Node | Connects to COMP2 via external RC network (e.g., 68pF || 0Ω) to tune closed-loop bandwidth/stability |
| GND (Pin 10) | Power Ground | Reference for all analog signals and digital inputs; must be low-impedance connection to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PA control channels | Enables single-chip management of multi-band PAs (e.g., GSM + DCS) without external multiplexing or sequencing logic |
| Integrated 50dB log RF detector | Delivers accurate power measurement across 450MHz–2GHz with <±1.5dB conformance error, eliminating need for external detector ICs |
| Temperature-compensated detection | Maintains log conformance stability over −40°C to +85°C, removing requirement for software-based temperature correction tables |
| User-configurable loop compensation | External RC network between COMP1 and COMP2 allows tuning of closed-loop response to match specific PA dynamics and GSM timing mask |
| GPRS-compliant timing performance | ≤6µs turn-on from shutdown and programmable ramp profile meet EN 301 511 GPRS Class 4/8 envelope requirements |
| Low-power shutdown mode | Reduces supply current to ≤30µA while holding outputs low, directly supporting TDMA slot-based power gating in mobile baseband architectures |
Applications
| GSM/GPRS Mobile Handset Transmitter | Quad-Band TDMA Power Amplifier Module |
|---|---|
Use Scenario: Transmit power control in dual-SIM or multi-mode handsets requiring simultaneous support for GSM900 and DCS1800 bands. IC Role / Device Role / Timing Role: Dual-channel PA controller providing independent, time-synchronized VAPC signals to two discrete PAs under BS-selectable control. Use Value: Eliminates need for two separate controllers, reducing BOM count and PCB area while maintaining strict GSM time-mask compliance (≤28µs ramp). |
Use Scenario: Compact front-end module integrating InGaP HBT PAs for LTE/WCDMA fallback in smartphones. IC Role / Device Role / Timing Role: Logarithmic RF detector and error amplifier core enabling closed-loop power regulation across 450MHz–2GHz with external coupler feedback. Use Value: Achieves ±0.5dB output power accuracy over temperature without factory recalibration, lowering test cost and improving yield. |
| Wireless LAN (IEEE 802.11b/g/n) PA Control | GPRS Pulse RF Control System |
Use Scenario: 2.4GHz WLAN transmitter requiring precise output power adjustment across multiple modulation schemes (DSSS, OFDM). IC Role / Device Role / Timing Role: RF power detector and ramp-controlled error amplifier delivering stable VAPC to SiGe or GaAs PA stages. Use Value: Log conformance slope of −1.65µA/dB at 2.4GHz enables linear-in-dB power setting, simplifying MAC-layer power backoff implementation. |
Use Scenario: Industrial telemetry transmitter using GPRS Class 10 for burst-mode sensor data upload. IC Role / Device Role / Timing Role: Low-quiescent shutdown controller synchronizing PA enable (TX_EN) and power ramp (VRAMP) with baseband burst scheduler. Use Value: 30µA shutdown current extends battery life in intermittent transmission applications; BS pin supports future expansion to dual-PATx configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power amplifier controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV2421LDX | Single-output variant; lacks BS pin and OUT2; identical detector, ramp, and compensation architecture | Suitable only for single-PA systems; cannot support dual-band concurrent operation | Select LMV2421LDX when system uses one PA per band and board space allows separate controllers per band |
| MAX2016ETE+ | Single-channel, 100MHz–3GHz log detector; no integrated error amplifier or PA drive capability; requires external op-amp | Needs additional components for closed-loop control; higher component count and layout complexity | Choose MAX2016ETE+ only when wider frequency coverage beyond 2GHz is mandatory and external loop design is acceptable |
Compared with LMV242LDX, LMV2421LDX reduces channel count but retains identical detection accuracy and compensation flexibility, while MAX2016ETE+ extends frequency range at the cost of requiring external amplification and loop components-making LMV242LDX optimal for space- and power-constrained dual-PA GSM/GPRS modules.
Availability
LMV242LDX is available at Aetrix Electronics and suitable for GSM/GPRS mobile handset design, quad-band TDMA PA module integration, and wireless LAN transmitter development requiring stable component supply and long-term production continuity.
Supply support for LMV242LDX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of RF IC design expertise and broad automotive, industrial, and communications product portfolios.
The LMV242LDX belongs to TI's RF power detector and PA controller family, engineered specifically for closed-loop transmit power control in TDMA- and GSM-based mobile communication systems operating from 450MHz to 2GHz.
FAQ
What is the primary function of the LMV242LDX in a mobile phone RF front-end?
The LMV242LDX serves as a dual-channel closed-loop power amplifier controller that regulates transmit output power by comparing detected RF power (via internal log detector) against a baseband-generated ramp voltage (VRAMP). It drives two independent PA gain-control inputs (OUT1/OUT2) and supports band-selectable operation via the BS pin-enabling efficient quad-band GSM/GPRS handset designs without external multiplexers or additional controllers. Its integrated architecture eliminates discrete detector + op-amp solutions, reducing bill-of-materials and PCB area.
How does the LMV242LDX achieve temperature-stable RF power detection?
The LMV242LDX incorporates on-die temperature compensation circuitry that maintains logarithmic conformance within ±1.5dB over −40°C to +85°C. This is achieved through matched transistor pairs and bias networks that counteract semiconductor parameter drift, ensuring consistent slope (−1.60 to −1.79 µA/dB) and intercept (−50.2 to −52.9 dBm) across frequency and temperature. As a result, the relationship between VRAMP voltage and actual PA output power remains stable without requiring host processor-based calibration updates.
Can the LMV242LDX be used with both InGaP HBT and silicon bipolar PAs?
Yes, the LMV242LDX is explicitly designed to support all single-supply PA technologies including InGaP HBT, GaAs MESFET, SiGe, and silicon bipolar transistors. Its output drivers deliver ≥10mA short-circuit current per channel and swing within 31mV of rails at 7mA load-sufficient to drive the VAPC inputs of modern high-efficiency PAs. The device's wide 2.6V–5.5V supply range and rail-to-rail compatible VRAMP interface ensure interoperability across diverse PA voltage and control sensitivity requirements.
What external components are required to configure the LMV242LDX for stable closed-loop operation?
A minimum external RC network between COMP1 and COMP2 pins is required for loop stability-TI recommends starting with 68pF capacitor and 0Ω resistor. A directional coupler (typically 20dB coupling factor) must connect PA output to RFIN, and optional attenuation (e.g., 15dB) may be added to match the −50dBm to 0dBm detector input range with PA output levels up to +35.5dBm. Decoupling capacitors (e.g., 100nF + 1µF) on VDD and proper RF grounding of GND (Pin 10) are mandatory for noise immunity and stability.
Does the LMV242LDX support GPRS Class 10 timing requirements?
Yes, the LMV242LDX meets GPRS Class 10 envelope timing specifications. With ≤6µs turn-on time from shutdown (TX_EN high) and programmable ramp profile via VRAMP slew rate control, it enables compliant 28µs power ramp-up and clean turn-off. Its dual-channel architecture allows time-multiplexed control of two PAs-supporting Class 10's requirement for fast switching between uplink bursts while maintaining adjacent channel leakage ratio (ACLR) and spectral mask integrity across GSM900/DCS1800 bands.
LMV242LDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- RF Type:
- Cellular, GSM, GPRS, TDMA, TD-SCDMA, WLL
- Frequency:
- 450MHz ~ 2GHz
- Features:
- Dual Output, Quad Band
- Supplier Device Package:
- 10-WSON (3x3)
LMV242LDX FAQ
1.How can I place an order for LMV242LDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV242LDX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LMV242LDX reliable?
The price and inventory of LMV242LDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV242LDX is usually 5 days.
3.What payment methods are accepted for LMV242LDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV242LDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV242LDX?
LMV242LDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV242LDX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LMV242LDX?
For technical support, including LMV242LDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV242LDX requirements.
6.How does Aetrix verify that LMV242LDX is sourced from the original manufacturer or authorized distributors?
All LMV242LDX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMV242LDX meets industry standards.
7.What is the process for return or replacement of LMV242LDX?
All LMV242LDX units undergo pre-shipment inspection (PSI). If there is an issue with LMV242LDX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LMV242LDX part is unused and in its original packaging.
Return procedure for LMV242LDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV242LDX Tags
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AD8311ACBZ-P7
Analog Devices Inc.
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LMV242LD/NOPB
Texas Instruments
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MAX4473EUA+
Analog Devices Inc./Maxim Integrated
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MAX4473EUA
Analog Devices Inc./Maxim Integrated
-
MAX4473EUA-T
Analog Devices Inc./Maxim Integrated
-
AD8316ACP-REEL
Analog Devices Inc.
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ADP3403ARU-REEL
Analog Devices Inc.
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AD8316ARM-REEL7
Analog Devices Inc.
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AD8315ACP-REEL7
Analog Devices Inc.
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AD8315ARM-REEL7
Analog Devices Inc.
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AD8316ACP-REEL7
Analog Devices Inc.
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AD8316ARM
Analog Devices Inc.
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