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Texas Instruments LMV242LDX/NOPB
- Part No.:
- LMV242LDX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- RF Power Controller ICs
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LMV242LDX/NOPB.pdf
- Description:
- IC RF PWR CNTRL PA 2GHZ 10WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
LMV242LDX/NOPB from Texas Instruments is a dual-output RF power detector and PA controller IC for GSM/GPRS transmit power control loops. It operates from 450MHz to 2GHz, delivers 50dB dynamic range logarithmic detection, integrates ramp filtering and temperature-compensated error amplifiers, and drives two independent power amplifiers in mobile phone PA modules.
For engineers reviewing the LMV242LDX/NOPB datasheet, LMV242LDX/NOPB pinout, LMV242LDX/NOPB application, or LMV242LDX/NOPB equivalent, this device is selected for precise closed-loop RF output power regulation in quad-band TDMA systems-especially where dual-PA control, GPRS compliance, and low-power shutdown during RX slots are required.
Technical Context
The LMV242LDX/NOPB implements a dual-channel closed-loop architecture with two independent error amplifiers, each fed by a shared log RF detector output current and user-programmable VRAMP reference. Band Select (BS) digitally routes COMP2 to either OUT1 or OUT2, enabling per-band PA control without external switching.
It supports single-supply operation from 2.6V to 5.5V, features Schmitt-triggered TX_EN and BS inputs for noise-immune digital control, and uses external RC compensation between COMP1 and COMP2 to stabilize loop response across frequency bands-critical for meeting GSM time-mask requirements with ≤28μs ramp settling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 450MHz to 2GHz - covers GSM900, DCS1800, PCS1900, and TD-SCDMA bands |
| Log Detection Range | −50 dBm to 0 dBm - enables full PA output power control (e.g., +35.5 dBm GSM) with ≥35 dB external attenuation |
| Supply Voltage | 2.6V to 5.5V - compatible with Li-ion battery rails and standard baseband supply domains |
| Operating Temperature | −40°C to +85°C - qualified for mobile handset environmental stress profiles |
| Shutdown Current | 0.2 µA typical at 2.6V - minimizes quiescent drain during receive slots in GPRS Class 12 operation |
| Log Slope | −1.74 µA/dB at 900MHz - defines linear-in-dB mapping of RF input power to detector output current |
| VRAMP Input Range | 0.2V to 1.8V - sets PA output power level with monotonic, temperature-stable transfer function |
Pinout & Package
LMV242LDX/NOPB is housed in a 10-pin WSON package (3mm × 3mm, NGY), thermally enhanced for high-density PA module integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFIN (Pin 5) | Analog RF input | Accepts coupled RF signal (e.g., from 20dB directional coupler); DC resistance = 55.7Ω |
| VDD (Pin 4) | Positive supply | Single power rail (2.6V–5.5V); supplies all internal blocks including dual error amplifiers |
| GND (Pins 8,10) | Power ground | Dual ground pins reduce impedance in high-frequency PA control paths |
| TX_EN (Pin 7) | Digital enable | Schmitt-triggered input; high = active mode, low = sub-µA shutdown with outputs pulled low |
| VRAMP (Pin 6) | Analog reference | 0.2V–1.8V input sets target PA output power; transconductance = 96 µA/V typical |
| BS (Pin 8) | Digital band select | High = OUT1 active, Low = OUT2 active; enables dual-band PA control without external mux |
| OUT1 (Pin 1) | PA1 control output | Drives gain-control input of first PA; sourcing/sinking capability up to 31.5 mA at 5V |
| OUT2 (Pin 2) | PA2 control output | Drives second PA; electrically identical to OUT1 but mutually exclusive via BS logic |
| COMP1 (Pin 9) | Compensation node | Connects external RC network (e.g., 68pF + 0Ω) to COMP2 for loop stability tuning |
| COMP2 (Pin 3) | Compensation switch | Routed to OUT1 or OUT2 based on BS state; completes integrator feedback path for selected channel |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PA control channels | Enables simultaneous or alternating control of two PAs (e.g., GSM + DCS bands) using one IC and shared detector |
| Integrated ramp filter & temperature compensation | Eliminates need for external filtering; maintains ±1 dB log conformance over −40°C to +85°C at 900/1800/1900/2000 MHz |
| GPRS-compliant shutdown mode | Reduces current to 0.2 µA while pulling both outputs low-meets Class 12 burst timing and battery life targets |
| External loop compensation | RC network between COMP1 and COMP2 allows Bode-based stability optimization for diverse PA gain characteristics |
| Wide supply voltage range | 2.6V–5.5V operation supports direct connection to Li-ion battery or regulated baseband supply without LDO |
Applications
| GSM/GPRS Mobile Handset | TD-SCDMA Transmit Module |
|---|---|
|
Use Scenario: Quad-band cellular handset requiring independent PA control for GSM900/DCS1800 and PCS1900 bands with GPRS Class 12 time-slot management. IC Role / Device Role / Timing Role: Dual-output PA controller providing closed-loop RF output power regulation, VRAMP-driven ramp profiling, and synchronized TX_EN/BS timing for GSM burst envelope compliance. Use Value: Enables single-chip dual-band control with <28 μs ramp settling, eliminating discrete op-amps and reducing PCB area by >40% vs dual-LMV2421 solution. |
Use Scenario: TD-SCDMA front-end module needing accurate, temperature-stable transmit power control across 1880–1920 MHz and 2010–2025 MHz bands. IC Role / Device Role / Timing Role: Logarithmic RF detector + dual error amplifier delivering monotonic POUT vs VRAMP transfer function, with BS-selectable outputs for TDD slot switching. Use Value: Achieves ±0.7 dB power accuracy over temperature using integrated temperature compensation-reducing factory calibration steps by 3×. |
| Wireless LAN Power Control | GSM Power Amplifier Module |
|
Use Scenario: 2.4 GHz Wi-Fi 802.11b/g transmit chain requiring dynamic EIRP control to meet regulatory limits and extend battery life. IC Role / Device Role / Timing Role: RF power detector operating at 2.4 GHz with −1.65 µA/dB slope and 50 dB dynamic range, interfacing to directional coupler and PA VAPC pin. Use Value: Delivers linear-in-dB response at 2.4 GHz (verified in typical characteristics), enabling precise closed-loop control without custom detector calibration. |
Use Scenario: Compact GSM PA module integrating InGaP HBT or SiGe bipolar PAs with tight thermal constraints and minimal footprint. IC Role / Device Role / Timing Role: Dual-channel PA controller in 3mm × 3mm WSON package, driving two PAs with matched output drive strength (31.5 mA sink/source at 5V). Use Value: Reduces module height and thermal resistance vs SOIC alternatives; WSON package supports bottom-side thermal pad attachment to heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power detector with PA controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV2421LDX/NOPB | Single-output variant; lacks BS pin and OUT2; identical detector, ramp, and compensation architecture | Suitable only for single-PA systems; cannot support dual-band or diversity PA configurations | Select when only one PA requires closed-loop control and board space permits simpler routing |
| MAX2016ETE+ | 30 dB detection range (vs 50 dB); integrated 50 Ω input termination; no external compensation option | Optimized for lower-dynamic-range applications like Bluetooth LE; lacks GPRS shutdown mode and VRAMP deadband tuning | Choose for cost-sensitive short-range devices where 30 dB range suffices and loop stability is fixed |
Compared with LMV242LDX/NOPB, LMV2421LDX/NOPB reduces channel count but retains full detection accuracy and temperature stability, while MAX2016ETE+ trades dynamic range and programmability for integration density and lower BOM count in non-GSM systems.
Availability
LMV242LDX/NOPB is available at Aetrix Electronics and suitable for GSM/GPRS mobile handsets, TD-SCDMA transmit modules, wireless LAN power control circuits, and compact GSM power amplifier modules requiring stable component supply and long-term production continuity.
Supply support for LMV242LDX/NOPB 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, embedded processing, and connectivity technologies, with decades of RF front-end innovation for wireless communications.
The LMV242x product line was designed specifically for closed-loop transmit power control in TDMA-based cellular handsets-targeting GPRS-compliant, multi-band mobile platforms with stringent size, power, and timing requirements.
FAQ
What is the primary function of the LMV242LDX/NOPB in a GSM transmit chain?
The LMV242LDX/NOPB serves as a dual-output RF power detector and PA controller that closes the feedback loop between a directional coupler's sampled RF signal and two independent power amplifiers. It converts detected RF power into a logarithmic current, compares it against a VRAMP-set reference, and drives OUT1 or OUT2 to regulate PA output power-ensuring compliance with GSM time masks and GPRS burst profiles. This function is intrinsic to the LMV242LDX/NOPB's architecture and documented in its functional block diagram.
How does the Band Select (BS) pin affect LMV242LDX/NOPB operation?
The BS pin on the LMV242LDX/NOPB is a Schmitt-triggered digital input that selects which output channel is active: BS = high enables OUT1 and routes COMP2 to it, while BS = low enables OUT2 and routes COMP2 accordingly. The inactive output is pulled low to minimum voltage. This allows time-multiplexed or band-specific control of two PAs without external switches-directly supported by the LMV242LDX/NOPB's internal switch matrix and confirmed in Pin Function Table 4-1.
What external components are required for stable closed-loop operation of the LMV242LDX/NOPB?
Stable closed-loop operation of the LMV242LDX/NOPB requires an external RC network between COMP1 and COMP2 pins-TI recommends starting with C = 68 pF and R = 0 Ω-and a directional coupler (typically 20 dB) with optional attenuation to match the PA's output power range (e.g., +35.5 dBm) to the LMV242LDX/NOPB's −50 dBm to 0 dBm detection range. These requirements are specified in Section 4 (Pin Functions) and Section 7.1.3 (Attenuation Configuration) of the LMV242LDX/NOPB datasheet.
Does the LMV242LDX/NOPB support operation below 450MHz or above 2GHz?
No-the LMV242LDX/NOPB is characterized and guaranteed for operation from 450 MHz to 2 GHz only. Electrical specifications including logarithmic slope, intercept, and conformance error are validated within this band (e.g., Figures 5-3 through 5-7). Performance outside this range is not specified, and the LMV242LDX/NOPB datasheet explicitly states "450MHz to 2GHz operation" as a core feature with no extended-frequency claims.
What is the purpose of the VRAMP deadband in the LMV242LDX/NOPB?
VRAMP deadband (155–265 mV typical) in the LMV242LDX/NOPB defines a low-sensitivity region near 0 V where small variations in the ramp voltage do not produce significant changes in output current-preventing unintended PA activation during system startup or noise-induced glitches. This behavior is measured and specified in Section 5.3 (Electrical Characteristics for 2.6V) and contributes to robust burst-mode timing in GSM/GPRS systems using the LMV242LDX/NOPB.
LMV242LDX/NOPB 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/NOPB FAQ
1.How can I place an order for LMV242LDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV242LDX/NOPB 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/NOPB reliable?
The price and inventory of LMV242LDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV242LDX/NOPB is usually 5 days.
3.What payment methods are accepted for LMV242LDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV242LDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV242LDX/NOPB?
LMV242LDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV242LDX/NOPB 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/NOPB?
For technical support, including LMV242LDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV242LDX/NOPB requirements.
6.How does Aetrix verify that LMV242LDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV242LDX/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LMV242LDX/NOPB?
All LMV242LDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV242LDX/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LMV242LDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV242LDX/NOPB Tags
-
AD8311ACBZ-P7
Analog Devices Inc.
-
LMV242LD/NOPB
Texas Instruments
-
MAX4473EUA+
Analog Devices Inc./Maxim Integrated
-
MAX4473EUA
Analog Devices Inc./Maxim Integrated
-
MAX4473EUA-T
Analog Devices Inc./Maxim Integrated
-
AD8316ACP-REEL
Analog Devices Inc.
-
ADP3403ARU-REEL
Analog Devices Inc.
-
AD8316ARM-REEL7
Analog Devices Inc.
-
AD8315ACP-REEL7
Analog Devices Inc.
-
AD8315ARM-REEL7
Analog Devices Inc.
-
AD8316ACP-REEL7
Analog Devices Inc.
-
AD8316ARM
Analog Devices Inc.
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