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Texas Instruments LMV228SD/NOPB
- Part No.:
- LMV228SD/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- RF Detectors
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LMV228SD/NOPB.pdf
- Description:
- IC RF DETECT 450MHZ-2GHZ 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:2,423
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Product details
Overview
LMV228SD/NOPB from Texas Instruments is a 30 dB linear-in-dB RF power detector optimized for CDMA and WCDMA transmit power control, operating from 450 MHz to 2 GHz with −15 dBm to +15 dBm input range, 0.2 V to 2 V output voltage, and logic-controlled shutdown. It integrates an internal 50 Ω RF termination and is used in PA modules for closed-loop RF power regulation.
For engineers reviewing the LMV228SD/NOPB datasheet, LMV228SD/NOPB pinout, LMV228SD/NOPB application, or LMV228SD/NOPB equivalent, this device requires attention to its logarithmic slope (44.0 mV/dB at 900 MHz, DSBGA), temperature-compensated intercept (−27.2 dBm at 900 MHz), enable pin behavior (RFIN/EN dual-role), and package-specific performance differences between DSBGA and WSON variants.
Technical Context
The LMV228SD/NOPB implements a true logarithmic detector architecture with integrated RF input termination (50 Ω in series with 45 pF), enabling direct connection to directional couplers without external matching. Its output voltage scales linearly with input RF power in dBm across the full −15 dBm to +15 dBm range.
It features active enable control via the RFIN/EN pin: high logic enables detection mode (IDD ≈ 6.2 mA at 2.7 V), low logic forces shutdown (IDD < 4.5 μA) with output pulled low. Temperature compensation ensures ≤ ±1.07 dB error over −40°C to +85°C at 900 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 450 MHz to 2000 MHz - supports all CDMA/WCDMA bands including PCS, AWS, and IMT-2000. |
| Input Power Range | −15 dBm to +15 dBm - matches directional coupler output levels in PA feedback loops. |
| Logarithmic Slope | 44.0 mV/dB at 900 MHz (DSBGA) - defines scaling factor for ADC interface; varies by frequency and package. |
| Logarithmic Intercept | −27.2 dBm at 900 MHz (DSBGA) - reference point where output = 0 V; critical for calibration offset. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with single-cell Li-ion and regulated 3.3 V systems. |
| Enable Logic Threshold | VHIGH ≥ 1.8 V, VLOW ≤ 0.8 V - interfaces directly with 1.8 V/3.3 V GPIO without level shifters. |
| Output Voltage Range | 0.2 V to 2.0 V - designed for direct interfacing with 10-bit+ ADCs (e.g., 0–3.3 V full-scale). |
Pinout & Package
LMV228SD/NOPB is packaged in a 1.0 mm × 1.0 mm × 0.35 mm ultra-thin DSBGA (package code YPD0004), suitable for space-constrained RF front-end modules.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RFIN/EN | RF Input / Enable Control | Dual-function pin: AC-coupled RF input (internally terminated 50 Ω + 45 pF); DC logic level sets active/shutdown state. |
| VDD | Positive Supply | Single supply input (2.7–5.5 V); PSRR > 40 dB up to 1 MHz minimizes supply noise coupling into output. |
| GND | Power Ground | Reference for both RF input and analog output; requires low-inductance connection to minimize measurement error. |
| OUT | Analog Output | Ground-referenced DC voltage proportional to log(RF power); output impedance ~26 kΩ enables RC filtering without loading. |
Key Features
| Feature | Design Value |
|---|---|
| Linear-in-dB response | 30 dB dynamic range (−15 to +15 dBm) with ≤ ±1.5 dB total error across temperature and frequency. |
| Integrated RF termination | 50 Ω + 45 pF internal input network eliminates need for external matching in directional coupler applications. |
| Temperature-compensated intercept | Log intercept drift ≤ ±1.45 dB from −40°C to +85°C at 2000 MHz (WSON), ensuring stable calibration over environment. |
| Low-power shutdown | Quiescent current < 4.5 μA in shutdown; output forced low for unambiguous system-level power-state signaling. |
| Fast turn-on time | 1.7 μs (typical) from shutdown to valid output - supports burst-mode transmission in TDD systems. |
Applications
| CDMA Base Station Transmitter | WCDMA Handset PA Module |
|---|---|
|
Use Scenario: Real-time forward power monitoring in macrocell BTS power amplifier stages using directional coupler feedback. IC Role / Device Role / Timing Role: RF power detector providing DC voltage proportional to PA output level for closed-loop AGC control. Use Value: Enables ±0.5 dB transmit power accuracy across temperature and battery voltage variation, meeting 3GPP TS 25.104 mask requirements. |
Use Scenario: Transmit power sensing in multi-band WCDMA handset front-end modules with integrated coupler. IC Role / Device Role / Timing Role: Linear-in-dB detector converting coupled RF signal to calibrated DC voltage for baseband processor ADC sampling. Use Value: Delivers < 1.2 dB log conformance error at 1900 MHz, supporting fast power ramping during handover without calibration recalibration. |
| CDMA2000 Mobile Hotspot | IoT Cellular Gateway |
|
Use Scenario: PA output monitoring in portable CDMA2000 hotspot devices with thermal constraints. IC Role / Device Role / Timing Role: Low-quiescent-current RF detector enabling duty-cycled power measurement during idle periods. Use Value: 4.5 μA shutdown current extends battery life; 1.7 μs wake-up supports LTE/CDMA2000 dual-mode burst scheduling. |
Use Scenario: Embedded cellular modem power control in industrial IoT gateways requiring long-term calibration stability. IC Role / Device Role / Timing Role: Temperature-compensated detector feeding microcontroller ADC for firmware-based PA bias adjustment. Use Value: Intercept drift < ±0.93 dB over −40°C to +85°C (DSBGA) reduces need for field recalibration in outdoor deployments. |
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 | Identical pinout and specs, but includes buffered output (5.3 mA drive) - not present in LMV228SD/NOPB. | Required when driving long traces or multiple ADC inputs; LMV228SD/NOPB suits single-point sensing only. | Select LMV226SD/NOPB if output load exceeds 26 kΩ or trace capacitance > 10 pF. |
| ADL5511ACPZ-R7 | Wider bandwidth (10 MHz–6 GHz), higher accuracy (±0.25 dB), but larger 3 mm × 3 mm LFCSP and 3.3 V only. | Used in broadband test equipment and 5G NR prototyping; not drop-in for CDMA/WCDMA handset space constraints. | Choose ADL5511ACPZ-R7 only for multi-standard designs requiring > 2 GHz coverage or sub-0.5 dB error. |
Compared with LMV226SD/NOPB, LMV228SD/NOPB offers lower cost and smaller footprint but lacks output buffering; versus ADL5511ACPZ-R7, it trades bandwidth and precision for integration, size, and supply flexibility in legacy 3G systems.
Availability
LMV228SD/NOPB is available at Aetrix Electronics and suitable for CDMA base station transmitters, WCDMA handset PA modules, and CDMA2000 mobile hotspots requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMV228SD/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 with focus on reliability and signal integrity.
The LMV228SD/NOPB belongs to TI's RF power detector product line, engineered specifically for accurate, temperature-stable transmit power monitoring in 3G cellular infrastructure and handset applications.
FAQ
What is the RF input impedance of the LMV228SD/NOPB?
The LMV228SD/NOPB features an internally matched RF input impedance of 50 Ω in series with 45 pF, optimized for direct connection to 50 Ω directional couplers without external matching networks. This configuration is confirmed in the datasheet's PIN DESCRIPTIONS section and validated across 450 MHz–2 GHz operation.
Does the LMV228SD/NOPB require external calibration for accurate power measurement?
The LMV228SD/NOPB includes factory-trimmed temperature compensation and exhibits ≤ ±1.45 dB total error over −40°C to +85°C at 2000 MHz (WSON variant), reducing need for per-unit calibration. System-level two-point calibration (at −15 dBm and +15 dBm) is still recommended for < ±0.5 dB accuracy in production.
Can the LMV228SD/NOPB be used with a 5 V supply?
Yes, the LMV228SD/NOPB operates across 2.7 V to 5.5 V. At 5.0 V supply, typical supply current is 6.8 mA in active mode and 0.32 μA in shutdown - both values are specified in the datasheet's 5.0 V electrical characteristics table.
How does the LMV228SD/NOPB differ from the LMV225SD/NOPB?
The LMV228SD/NOPB targets −15 dBm to +15 dBm input range for directional coupler use, while LMV225SD/NOPB covers −30 dBm to 0 dBm for resistive tap applications. LMV228SD/NOPB also has different logarithmic intercept (−27.2 dBm vs. −45.5 dBm at 900 MHz) and is offered in both DSBGA and WSON packages.
What is the maximum RF input power the LMV228SD/NOPB can tolerate without damage?
The LMV228SD/NOPB has no absolute maximum RF input power rating beyond its specified operating range, but the Absolute Maximum Ratings specify VDD–GND ≤ 6.0 V and junction temperature ≤ 150°C. Sustained RF input > +20 dBm may cause thermal overstress; design margin recommends limiting to +15 dBm per datasheet specifications.
LMV228SD/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:
- -15dBm ~ 15dBm
- Accuracy:
- ±1dB
- Voltage - Supply:
- 2.7V ~ 5V
- Mounting Type:
- 8 mA
- Supplier Device Package:
- Surface Mount
- Current - Supply:
- 6-WSON (2.2x2.5)
LMV228SD/NOPB FAQ
1.How can I place an order for LMV228SD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV228SD/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 LMV228SD/NOPB reliable?
The price and inventory of LMV228SD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV228SD/NOPB is usually 5 days.
3.What payment methods are accepted for LMV228SD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV228SD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV228SD/NOPB?
LMV228SD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV228SD/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 LMV228SD/NOPB?
For technical support, including LMV228SD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV228SD/NOPB requirements.
6.How does Aetrix verify that LMV228SD/NOPB is sourced from the original manufacturer or authorized distributors?
All LMV228SD/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 LMV228SD/NOPB meets industry standards.
7.What is the process for return or replacement of LMV228SD/NOPB?
All LMV228SD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMV228SD/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 LMV228SD/NOPB part is unused and in its original packaging.
Return procedure for LMV228SD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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