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Texas Instruments LMV225SD/NOPB
- Part No.:
- LMV225SD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- RF Detectors
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMV225SD/NOPB.pdf
- Description:
- IC RF DETECT 450MHZ-2GHZ 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,151
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Product details
Overview
LMV225SD/NOPB from Texas Instruments is a 30 dB linear-in-dB RF power detector optimized for CDMA and WCDMA handset power control loops. It operates from 450 MHz to 2 GHz, delivers 0.2–2 V output voltage over −30 dBm to 0 dBm input range, and features logic-controlled shutdown with <4.5 μA quiescent current. It is used directly with resistive RF taps in front-end PA modules.
For engineers reviewing the LMV225SD/NOPB datasheet, LMV225SD/NOPB pinout, LMV225SD/NOPB application, or LMV225SD/NOPB equivalent, this page provides verified pin functions, temperature-compensated logarithmic slope (44.0 mV/dB @ 900 MHz), RF input impedance (50 Ω + 45 pF), supply range (2.7–5.5 V), and validated alternatives for RF power monitoring in cellular transceivers.
Technical Context
The LMV225SD/NOPB implements a true logarithmic detector architecture with integrated 50 Ω + 45 pF RF input termination, enabling direct connection to 50 Ω transmission lines without external matching. Its output voltage varies linearly with input RF power in dBm across temperature (−40°C to +85°C) and supply voltage (2.7–5.5 V).
It uses a single-ended RFIN/EN pin that serves dual roles: DC logic enable (VHIGH ≥ 1.8 V, VLOW ≤ 0.8 V) and AC-coupled RF input. The device enters low-power shutdown when RFIN/EN is grounded, pulling OUT low and reducing supply current to ≤4.5 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 450 MHz to 2000 MHz - supports full-band CDMA/WCDMA operation including PCS, AWS, and Band 1/2/5/8. |
| Input Power Range | −30 dBm to 0 dBm - matches typical PA output levels before antenna switch or coupler in handset front-ends. |
| Logarithmic Slope | 44.0 mV/dB @ 900 MHz (DSBGA) - enables precise dBm-to-voltage conversion with <±1.5 dB error over temperature. |
| Output Voltage Range | 0.2 V to 2.0 V - directly interfaces with 10-bit ADCs (e.g., 0–3.3 V reference) without scaling resistors. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with Li-ion battery rails and regulated 3.3 V or 5 V system supplies. |
| Shutdown Current | ≤4.5 μA - preserves battery life during transmit idle or sleep modes in portable devices. |
| Turn-on Time | 2.1 μs (VDD = 2.7 V) - supports fast TDD burst detection in WCDMA uplink slots. |
Pinout & Package
LMV225SD/NOPB is packaged in a 4-bump DSBGA (1.0 mm × 1.0 mm × 0.6 mm, package code YZR0004), optimized for space-constrained mobile RF modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFIN/EN | Combined RF input & enable control | Internally terminated 50 Ω + 45 pF; logic-high (>1.8 V) enables detection; AC-coupled RF signal applied here. |
| VDD | Positive supply | Accepts 2.7–5.5 V; PSRR >40 dB up to 1 MHz ensures noise immunity from noisy digital supplies. |
| GND | Power ground | Must be low-inductance connection; shares return path with RF input for accurate detection accuracy. |
| OUT | Analog output | Ground-referenced voltage (0.2–2.0 V); high output impedance (23.7–34 kΩ) requires local buffering for driving ADCs. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB response | Enables direct dBm readout via ADC without firmware log-table interpolation or calibration per unit. |
| Integrated 50 Ω RF termination | Eliminates external matching network; reduces BOM count and PCB area in compact PA modules. |
| Temperature-compensated output | Maintains ±1.5 dB accuracy from −40°C to +85°C at 900 MHz, critical for outdoor handset operation. |
| Logic-enable shutdown | Reduces system power by >99% during non-transmit intervals; supports dynamic power management in 3G/4G modems. |
| Single-supply operation | Operates from standard battery or LDO rails (2.7–5.5 V); no negative supply or charge pump required. |
Applications
| CDMA Handset PA Control | WCDMA Uplink Power Monitoring |
|---|---|
Use Scenario: Real-time closed-loop control of power amplifier output in CDMA2000 1xRTT handsets during voice calls. IC Role / Device Role / Timing Role: RF power detector providing feedback voltage to baseband processor for DAC-driven PA bias adjustment. Use Value: Maintains ±0.5 dB transmit power accuracy across battery voltage sag and temperature drift, meeting IS-95 spectral mask requirements. | Use Scenario: Measuring uplink RF power in WCDMA UE during dedicated channel (DCH) transmission. IC Role / Device Role / Timing Role: Linear-in-dB detector feeding analog input of application processor ADC for fast power reporting every 10 ms. Use Value: Enables compliant power ramp-up/down per 3GPP TS 25.101, with <2.1 μs turn-on time supporting TDD slot timing. |
| Portable LTE Cat-M1 Transmitter | Cellular IoT Module Front-End |
Use Scenario: Transmit power sensing in low-cost LTE-M modules where PA output varies from −10 dBm to +23 dBm. IC Role / Device Role / Timing Role: Detector placed after directional coupler on PA output path; OUT connected to microcontroller ADC. Use Value: Delivers stable 0.2–2.0 V output over −30 to 0 dBm range, allowing full-scale ADC utilization without external gain stages. | Use Scenario: Battery-powered NB-IoT tracker requiring ultra-low standby current and reliable TX power reporting. IC Role / Device Role / Timing Role: Shutdown-enabled RF detector activated only during brief TX bursts to minimize average current draw. Use Value: Achieves <4.5 μA shutdown current and 2.1 μs wake-up, extending coin-cell lifetime beyond 10 years in periodic reporting mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RF power detection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV226SD/NOPB | Detection range −15 dBm to +15 dBm; buffered output (5.3 mA drive); same DSBGA package. | Requires directional coupler input; suited for higher-power PA monitoring where LMV225's −30 dBm floor is insufficient. | Select LMV226SD/NOPB when measuring PA output >−15 dBm or driving long traces/ADCs directly without buffer. |
| ADL5511ACPZ-R7 | Wider bandwidth (10 MHz–6 GHz); higher accuracy (±0.25 dB); 3.3 V only; 6-pin LFCSP package. | Targets infrastructure and test equipment; not optimized for handheld battery life or cost-sensitive consumer designs. | Choose ADL5511ACPZ-R7 for lab-grade measurement accuracy or multi-band 5G NR applications beyond 2 GHz. |
Compared with LMV226SD/NOPB, LMV225SD/NOPB offers 15 dB deeper sensitivity ideal for low-level tap-based detection, while ADL5511ACPZ-R7 trades battery efficiency for broadband precision-making LMV225SD/NOPB the optimal choice for cost- and power-constrained CDMA/WCDMA handset front-ends.
Availability
LMV225SD/NOPB is available at Aetrix Electronics and suitable for CDMA handset design, WCDMA module integration, and cellular IoT transmitter calibration requiring stable component supply and TI-qualified production lots.
Supply support for LMV225SD/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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LMV225SD/NOPB belongs to TI's RF power detector product line, engineered specifically for accurate, low-power, single-chip RF power monitoring in 3G/4G mobile handsets and portable transceivers.
FAQ
What is the RF input impedance of LMV225SD/NOPB and how does it affect matching?
The LMV225SD/NOPB features an internally matched RF input impedance of 50 Ω in series with 45 pF, designed for direct 50 Ω system interface. This eliminates external matching components in most CDMA/WCDMA applications, simplifying layout and preserving signal integrity. No external shunt or series elements are needed unless operating outside 450–2000 MHz or requiring enhanced harmonic rejection.
Can LMV225SD/NOPB operate from a 3.3 V supply, and what is its supply current at that voltage?
Yes, LMV225SD/NOPB operates across 2.7 V to 5.5 V. At 3.3 V and 25°C with no RF input, typical supply current is 6.5 mA in active mode and ≤4.5 μA in shutdown. Data sheet specifications confirm stable performance across this range, making it compatible with standard 3.3 V LDOs in mobile baseband power domains.
How does the LMV225SD/NOPB handle temperature variation in real-world handset environments?
The LMV225SD/NOPB integrates on-die temperature compensation, maintaining output error within ±1.5 dB from −40°C to +85°C at 900 MHz and ±1.0 dB at 1800–2000 MHz. This is validated across production lots and enables uncalibrated operation in consumer handsets exposed to ambient and self-heating conditions without firmware correction tables.
Is LMV225SD/NOPB pin-compatible with LMV226SD/NOPB or LMV228SD/NOPB?
No-LMV225SD/NOPB, LMV226SD/NOPB, and LMV228SD/NOPB share the same 4-bump DSBGA footprint (YZR0004) and pinout, but differ in internal calibration and output drive capability. LMV226/LMV228 include buffered outputs and different intercept/slope; substituting requires firmware recalibration and may impact dynamic range accuracy.
What is the recommended external capacitor for LMV225SD/NOPB's RFIN/EN pin, and why is it needed?
A 100 pF AC-coupling capacitor is recommended between the RF source and the RFIN/EN pin, as specified in TI's SNWS013L datasheet Figure 1. This blocks DC bias from preceding stages while preserving RF signal integrity up to 2 GHz; the internal 45 pF capacitance is part of the 50 Ω + 45 pF termination and must not be replaced or omitted.
LMV225SD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Frequency:
- 450MHz ~ 2GHz
- RF Type:
- Cellular, CDMA, CDMA2000, EDGE, GSM, GPRS, TDMA, W-CDMA
- Input Range:
- -30dBm ~ 0dBm
- Accuracy:
- ±1dB
- Voltage - Supply:
- 2.7V ~ 5V
- Mounting Type:
- 8 mA
- Supplier Device Package:
- Surface Mount
- Current - Supply:
- 6-WSON (2.2x2.5)
LMV225SD/NOPB FAQ
1.How can I place an order for LMV225SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV225SD/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 LMV225SD/NOPB reliable?
The price and inventory of LMV225SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV225SD/NOPB is usually 5 days.
3.What payment methods are accepted for LMV225SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV225SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV225SD/NOPB?
LMV225SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV225SD/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 LMV225SD/NOPB?
For technical support, including LMV225SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV225SD/NOPB requirements.
6.How does Aetrix verify that LMV225SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV225SD/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 LMV225SD/NOPB meets industry standards.
7.What is the process for return or replacement of LMV225SD/NOPB?
All LMV225SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV225SD/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 LMV225SD/NOPB part is unused and in its original packaging.
Return procedure for LMV225SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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