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Analog Devices Inc. LT5571EUF#TRPBF
- Part No.:
- LT5571EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Modulators
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT5571EUF#TRPBF.pdf
- Description:
- RF MODULATOR 620MHZ-1.1GHZ 16QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LT5571EUF#TRPBF from Analog Devices (formerly Linear Technology) is a 620MHz–1100MHz direct quadrature I/Q modulator for wireless infrastructure transmitters. It delivers –4.2dB conversion gain, 21.7dBm OIP3 at 900MHz, –53dBc image rejection, –42dBm LO feedthrough, and –159dBm/Hz noise floor at 20MHz offset. It enables high-linearity RF upconversion in GSM, CDMA2000, and RFID interrogator systems.
For engineers reviewing the LT5571EUF#TRPBF datasheet, LT5571EUF#TRPBF pinout, LT5571EUF#TRPBF application, or LT5571EUF#TRPBF equivalent, key selection criteria include I/Q gain/phase imbalance (<0.013dB / <0.24°), 16-lead 4mm × 4mm QFN package with exposed ground pad, DC-coupled 0.5V common-mode baseband interface, integrated LO quadrature generator, and 4.5V–5.25V supply operation.
Technical Context
The LT5571EUF#TRPBF implements a direct-conversion architecture with differential voltage-to-current converters driving double-balanced mixers, whose outputs are summed and transformed to 50Ω single-ended RF via an on-chip balun. Its LO path integrates a single-ended buffer and precision quadrature phase generator producing 0° and 90° signals for mixer drive.
Baseband inputs (BBPI/BBMI/BBPQ/BBMQ) present 90kΩ differential impedance and require externally applied 0.5V common-mode bias; the RF output is AC-coupled with typical S22 of 12.7dB at 900MHz when enabled. The enable pin (EN) provides 0.4µs turn-on and 1.4µs turn-off switching control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 620MHz–1100MHz; supports cellular bands including GSM, CDMA2000, and RFID downlink. |
| OIP3 | 21.7dBm at 900MHz; enables high-output-power transmitter designs with low intermodulation distortion. |
| Image Rejection | –53dBc at 900MHz; minimizes unwanted sideband energy without external calibration circuitry. |
| Conversion Gain | –4.2dB; defines RF output voltage per differential baseband input voltage, critical for DAC-to-RF signal chain gain budgeting. |
| Noise Floor | –159dBm/Hz at 20MHz offset (no signal); sets minimum detectable signal level in receiver-shared architectures. |
| LO Feedthrough | –42dBm at 900MHz; limits carrier leakage that degrades EVM and adjacent channel power ratio (ACPR). |
| I/Q Imbalance | 0.013dB gain / 0.24° phase; directly determines achievable image suppression before digital correction. |
Pinout & Package
The LT5571EUF#TRPBF is housed in a 16-lead 4mm × 4mm plastic QFN package (UF) with exposed thermal pad (Pin 17) that must be soldered to PCB ground for RF performance and thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (1) | Enable control input | Logic-high (>1V) activates device; logic-low (<0.5V) places IC in 100µA shutdown mode with 1.4µs turn-off time. |
| GND (2,4,6,9,10,12,15,17) | Ground reference | Multiple dedicated ground pins: Pins 2/4 for LO return, Pins 10/12 for RF balun return, Pin 17 exposed pad for thermal/RF grounding. |
| LO (3) | Single-ended LO input | 50Ω AC-coupled port accepting –10dBm to +5dBm LO drive; internal buffer generates quadrature LO signals. |
| BBPI/BBMI (14,16) | I-channel baseband inputs | Differential 90kΩ impedance; require 0.5V common-mode bias; DC-coupled interface to DACs or baseband processors. |
| BBPQ/BBMQ (7,5) | Q-channel baseband inputs | Identical to I-channel inputs; 90kΩ differential impedance with 0.5V CM bias; matched to BBPI/BBMI for <0.24° phase accuracy. |
| VCC (8,13) | Power supply | 4.5V–5.25V dual-supply pins internally connected; each requires 0.1µF decoupling capacitor to ground. |
| RF (11) | Single-ended RF output | 50Ω AC-coupled output; S22 = 12.7dB at 900MHz; coupling capacitor recommended above 3dBm output to avoid ESD diode nonlinearity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO quadrature generator | Eliminates external 90° hybrid coupler or polyphase filter, reducing BOM count and board area in compact transmitters. |
| DC-coupled 0.5V common-mode baseband interface | Enables seamless connection to current-output DACs without AC-coupling capacitors or level-shifting circuitry. |
| High OIP3 (21.7dBm) at 900MHz | Supports multi-carrier CDMA2000 transmission with –70.4dBc 3-ch ACPR, meeting stringent spectral mask requirements. |
| Low noise floor (–159dBm/Hz) | Preserves SNR in wideband receivers sharing LO paths or in full-duplex transceivers with tight isolation budgets. |
| 16-lead 4mm × 4mm QFN with exposed pad | Provides low-inductance ground path and thermal dissipation for continuous 97mA operating current at 5V. |
Applications
| Wireless Infrastructure Base Stations | GSM/EDGE Transmitter Modules |
|---|---|
Use Scenario: High-density macrocell BTS transmitting multiple CDMA2000 carriers in 850MHz band. IC Role / Device Role / Timing Role: Direct-conversion I/Q modulator translating baseband I/Q signals to RF with integrated LO quadrature generation. Use Value: Achieves –70.4dBc 3-carrier ACPR and –53dBc image rejection without external calibration, reducing system-level complexity. | Use Scenario: Compact pico/femtocell unit supporting 8PSK EDGE modulation in 900MHz band. IC Role / Device Role / Timing Role: RF upconverter providing precise I/Q phase alignment and low LO feedthrough for <2.5% EVM. Use Value: Delivers –42dBm carrier leakage and <0.24° I/Q phase imbalance, enabling compliant spectral emission without post-fabrication tuning. |
| CDMA2000 Point-to-Point Links | RFID Interrogator Systems |
Use Scenario: Licensed-band backhaul link operating at 1.1GHz with 10MHz channel bandwidth. IC Role / Device Role / Timing Role: High-linearity modulator handling 20dBm peak envelope power with minimal adjacent channel interference. Use Value: 21.7dBm OIP3 and –159dBm/Hz noise floor ensure >70dB ACLR across temperature range (–40°C to 85°C). | Use Scenario: UHF RFID reader transmitting at 915MHz with 50kHz modulation bandwidth for tag interrogation. IC Role / Device Role / Timing Role: Low-noise, low-distortion modulator generating clean RF carrier with minimal harmonic content. Use Value: Integrated 50Ω RF output and 90kΩ baseband inputs simplify matching network design, reducing component count by ≥3 vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar direct-conversion modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5375-05ACPZ-R7 | Wider RF range (300MHz–4GHz), higher OIP3 (27dBm), but requires external LO synthesizer and consumes 220mA. | Better suited for multiband software-defined radios; less optimal for fixed-frequency 900MHz infrastructure due to higher power and complexity. | Select ADL5375-05 if frequency agility across LTE/5G bands is required; LT5571EUF#TRPBF remains preferred for cost-sensitive, single-band 900MHz deployments. |
| TRF3705IRGET | Lower OIP3 (17.5dBm), no integrated LO quadrature generator, requires external 90° splitter; 4.5V–5.5V supply. | Requires additional passive components for image rejection; suitable for lower-linearity applications where BOM cost is secondary to footprint. | Choose TRF3705IRGET only when existing designs already include quadrature LO distribution; LT5571EUF#TRPBF offers superior integration and image rejection out-of-box. |
Compared with ADL5375-05ACPZ-R7 and TRF3705IRGET, the LT5571EUF#TRPBF provides best-in-class image rejection (–53dBc) and lowest noise floor (–159dBm/Hz) within its 620–1100MHz band, while requiring no external quadrature generation-making it ideal for optimized, production-ready wireless infrastructure transmitters.
Availability
LT5571EUF#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure base stations, GSM/EDGE transmitter modules, and RFID interrogator systems requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LT5571EUF#TRPBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs for precision signal processing applications.
The LT5571 product line was designed specifically for high-linearity, direct-conversion RF transmitters in wireless infrastructure-emphasizing integrated LO quadrature generation, low noise, and robust I/Q amplitude/phase matching across temperature.
FAQ
What is the recommended common-mode voltage for LT5571EUF#TRPBF baseband inputs?
The LT5571EUF#TRPBF requires an externally applied 0.5V DC common-mode voltage on all four baseband input pins (BBPI, BBMI, BBPQ, BBMQ) to maximize dynamic range and minimize distortion. Deviation from 0.5V degrades OIP3 and image rejection; Table 1 in the datasheet shows performance shifts across 0.1V–0.6V range. Maintaining 0.5V ensures optimal LT5571EUF#TRPBF operation in GSM and CDMA2000 transmitters.
Does LT5571EUF#TRPBF require external LO quadrature generation?
No, the LT5571EUF#TRPBF integrates a precision LO quadrature phase generator that produces accurate 0° and 90° LO signals from a single-ended input-eliminating need for external hybrids or polyphase filters. This internal generation maintains <0.24° phase imbalance at 900MHz, enabling –53dBc image rejection without calibration. The LT5571EUF#TRPBF thus simplifies RF front-end design versus alternatives like TRF3705IRGET.
What is the absolute maximum supply voltage for LT5571EUF#TRPBF?
The absolute maximum supply voltage for LT5571EUF#TRPBF is 5.5V, as specified in Absolute Maximum Ratings. Operation above 5.25V risks exceeding safe junction temperature and may degrade long-term reliability. The recommended operating range is 4.5V–5.25V; at 5V, LT5571EUF#TRPBF draws 97–120mA and achieves optimal OIP3 (21.7dBm) and noise floor (–159dBm/Hz).
How does LT5571EUF#TRPBF handle RF output matching?
The LT5571EUF#TRPBF features an AC-coupled 50Ω single-ended RF output with typical S22 of 12.7dB at 900MHz when enabled. No external matching network is required for standard 50Ω systems; however, a series capacitor is recommended in the RF path above 3dBm output to prevent ESD diode conduction. For improved low-frequency return loss, a shunt inductor can be added-per Figure 5 in the LT5571EUF#TRPBF datasheet.
Can LT5571EUF#TRPBF be used as an image-reject upconverting mixer?
Yes, the LT5571EUF#TRPBF can be configured as an image-reject upconverting mixer by applying 90° phase-shifted signals to the I and Q inputs-leveraging its inherent quadrature architecture. This mode is explicitly supported in the datasheet and enables rejection of unwanted sidebands without external filtering. When used this way, LT5571EUF#TRPBF maintains –53dBc image rejection at 900MHz, making it suitable for cellular band upconverters and low-noise variable phase-shifters.
LT5571EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Modulator
- LO Frequency:
- 500MHz ~ 1.2GHz
- RF Frequency:
- 620MHz ~ 1.1GHz
- P1dB:
- 8.1dBm
- Noise Floor:
- -159dBm/Hz
- Output Power:
- -0.2dBm
- Current - Supply:
- 120 mA
- Voltage - Supply:
- 4.5V ~ 5.25V
- Test Frequency:
- 900MHz
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LT5571EUF#TRPBF FAQ
1.How can I place an order for LT5571EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT5571EUF#TRPBF 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 LT5571EUF#TRPBF reliable?
The price and inventory of LT5571EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT5571EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT5571EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT5571EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT5571EUF#TRPBF?
LT5571EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT5571EUF#TRPBF 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 LT5571EUF#TRPBF?
For technical support, including LT5571EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT5571EUF#TRPBF requirements.
6.How does Aetrix verify that LT5571EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT5571EUF#TRPBF 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 LT5571EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT5571EUF#TRPBF?
All LT5571EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT5571EUF#TRPBF, 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 LT5571EUF#TRPBF part is unused and in its original packaging.
Return procedure for LT5571EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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