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Analog Devices Inc. LT5572EUF#TRPBF
- Part No.:
- LT5572EUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Modulators
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
LT5572EUF#TRPBF.pdf
- Description:
- RF MODULATOR 1.5GHZ-2.5GHZ 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,561
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Product details
Overview
LT5572EUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-linearity direct quadrature modulator IC for wireless infrastructure transmitters, operating from 1.5GHz to 2.5GHz RF frequency range. It delivers –2.5dB conversion gain, +21.6dBm OIP3 at 2GHz, –41.2dBc image rejection, and supports W-CDMA, LTE, CDMA2000, and TD-SCDMA baseband-to-RF upconversion with DC-coupled 0.5V common-mode I/Q inputs.
For engineers reviewing the LT5572EUF#TRPBF datasheet, LT5572EUF#TRPBF pinout, LT5572EUF#TRPBF application, or LT5572EUF#TRPBF equivalent, this page provides verified RF performance data, validated 16-pin QFN package mapping, confirmed baseband interface requirements, and real-world ACPR/noise floor behavior across temperature and supply voltage variations.
Technical Context
The LT5572EUF#TRPBF integrates differential voltage-to-current converters for I/Q baseband inputs, double-balanced up-conversion mixers, an on-chip 50Ω RF balun, and a precision LO quadrature phase generator with single-ended 50Ω LO input. Its architecture enables direct conversion without external image-reject filtering.
It operates with 4.5V–5.25V supply, draws 120–145mA in active mode, and features enable-controlled shutdown (50µA sleep current). Baseband inputs require 0.5V DC common-mode bias and present ~90kΩ differential impedance, while LO and RF ports are AC-coupled and 50Ω matched.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.5GHz to 2.5GHz - supports DCS, PCS, UMTS, and LTE bands without external tuning. |
| OIP3 | +21.6dBm at 2GHz - enables high-power, multi-carrier W-CDMA transmission with low intermodulation distortion. |
| Image Rejection | –41.2dBc at 2GHz - reduces need for post-modulation image filtering in basestation designs. |
| Conversion Gain | –2.5dB - defines signal level loss from baseband differential input to 50Ω RF output, critical for DAC-to-Power Amplifier chain gain budgeting. |
| Baseband Input CM Voltage | 0.5V - fixed bias point required for optimal linearity; deviation degrades OIP3 and image rejection. |
| Supply Current | 145mA max at 5V - determines thermal load and PCB power delivery design for dense RF modules. |
| LO Input Power | 0dBm typical - lower drive increases noise figure; higher drive raises LO feedthrough without improving linearity. |
Pinout & Package
LT5572EUF#TRPBF is housed in a 16-lead 4mm × 4mm plastic QFN package 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 modulator; logic-low (<0.5V) disables with 50µA sleep current. |
| GND (2,4,6,9,10,12,15,17) | Ground reference | Multiple dedicated GND pins serve LO return (2,4), RF balun return (10,12), and general ground (6,9,15); exposed pad (17) is mandatory thermal/RF ground. |
| LO (3) | Single-ended LO input | 50Ω AC-coupled port accepting 0dBm LO drive; internal buffer generates precise quadrature LO signals for mixers. |
| BBPI / BBMI (14,16) | I-channel baseband differential input | 90kΩ differential impedance; requires 0.5V DC common-mode bias; drives I-mixer via integrated V-I converter. |
| BBPQ / BBMQ (7,5) | Q-channel baseband differential input | Identical to BBPI/BBMI; phase-orthogonal path enabling complex modulation and image suppression. |
| VCC (8,13) | Power supply | 4.5V–5.25V supply; dual pins internally connected; each requires local 0.1µF decoupling to GND. |
| RF (11) | Single-ended RF output | 50Ω AC-coupled output; internal balun converts mixer differential outputs to 50Ω single-ended; coupling capacitor recommended above 3dBm. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated LO quadrature generator | Eliminates external 90° hybrid or polyphase filter, reducing BOM count and layout sensitivity in 1.5–2.5GHz LO paths. |
| DC-coupled 0.5V common-mode baseband interface | Enables direct connection to DACs without AC-coupling capacitors or level-shifting circuitry, preserving low-frequency signal integrity. |
| On-chip RF balun with 50Ω output | Removes need for external transformer or balun, simplifying RF output matching and improving repeatability across production units. |
| High OIP2 (+53.2dBm) and OIP3 (+21.6dBm) | Supports multi-carrier W-CDMA and LTE signals with >60dB ACLR margin before digital predistortion is required. |
| Low noise floor (–158.6dBm/Hz at 20MHz offset) | Ensures clean spectral mask compliance in adjacent channel leakage ratio (ACLR) tests for 4G/5G basestation deployments. |
Applications
| W-CDMA Basestation Transmitter | LTE FDD/Uplink Modulator |
|---|---|
Use Scenario: Transmitting 64-DPCH downlink signals in macrocell basestations operating at 2.14GHz. IC Role / Device Role / Timing Role: Direct quadrature modulator converting baseband I/Q DAC outputs to RF carrier with integrated LO phase generation. Use Value: Achieves –67.7dBc 4-channel ACPR at 2.14GHz, meeting 3GPP TS 25.104 spectral mask without analog predistortion. | Use Scenario: Uplink signal upconversion in LTE FDD small-cell eNodeB with 1.8GHz band support. IC Role / Device Role / Timing Role: High-linearity RF modulator accepting DC-coupled I/Q inputs synchronized to LTE TDD frame timing. Use Value: Delivers –41.2dBc image rejection and +21.6dBm OIP3, enabling 20MHz bandwidth signal transmission with <–45dBc EVM. |
| CDMA2000 Base Transceiver Station | TD-SCDMA Infrastructure Modulator |
Use Scenario: Multi-carrier forward-link transmission in CDMA2000 1xEV-DO Rev.A systems at 1.9GHz. IC Role / Device Role / Timing Role: Direct-conversion transmitter core handling 1.2288Mcps chip-rate I/Q waveforms with precise LO quadrature. Use Value: Maintains –39.4dBm carrier leakage and –152.5dBm/Hz noise floor at 4dBm POUT, ensuring IS-2000 spectral purity compliance. | Use Scenario: Time-division duplexed uplink modulation in TD-SCDMA RNC-connected remote radio units at 2.0GHz. IC Role / Device Role / Timing Role: Low-latency I/Q modulator supporting 1.28Mcps chip rate with fast enable/disable (0.25µs turn-on). Use Value: Enables rapid slot-to-slot power ramping via EN pin control while sustaining >40dB image rejection across 1.88–2.02GHz band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar direct quadrature modulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5375-05 | Wider RF range (300MHz–4GHz), higher OIP3 (+24.5dBm), but requires external LO phase splitter and 3.3V supply. | Better suited for multi-band microcell radios; not drop-in due to different supply, bias, and LO interface. | Select when wider frequency coverage and higher linearity outweigh added external components and redesign effort. |
| TRF3705 | Narrower RF range (1.5–2.2GHz), lower OIP3 (+18.5dBm), integrated LO buffer only (no quadrature generator). | Requires external 90° hybrid; suitable for cost-sensitive single-band repeaters where image rejection >35dBc suffices. | Choose for simplified LO sourcing and lower BOM cost where full LT5572EUF#TRPBF performance is not required. |
Compared with ADL5375-05 and TRF3705, the LT5572EUF#TRPBF uniquely integrates a precision LO quadrature generator and supports 0.5V DC-coupled baseband inputs-enabling compact, high-performance basestation transmitter designs without external phase-splitting or level-shifting circuitry.
Availability
LT5572EUF#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, macrocell basestation, and small-cell radio applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for FCC/CE-certified equipment.
Supply support for LT5572EUF#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 communications, industrial, and automotive markets.
The LT5572EUF#TRPBF belongs to Linear's high-linearity RF modulator product line, designed specifically for wireless infrastructure transmitters demanding exceptional image rejection, wide dynamic range, and DC-coupled baseband interface simplicity.
FAQ
What is the recommended LO input power for optimal performance of the LT5572EUF#TRPBF?
The LT5572EUF#TRPBF achieves best linearity and noise performance at 0dBm LO input power. Lower drive (e.g., –5dBm) degrades OIP2/OIP3 and increases noise figure, especially at 85°C; higher drive (e.g., 5dBm) increases LO feedthrough without improving gain or linearity. The datasheet specifies –10dBm to +5dBm absolute maximum range.
Can the LT5572EUF#TRPBF operate with baseband common-mode voltage other than 0.5V?
Yes, the LT5572EUF#TRPBF can be biased at 0.1V–0.6V common-mode voltage, but performance shifts significantly: OIP3 drops from +21.2dBm at 0.5V to +8.3dBm at 0.1V, and image rejection degrades from –41.5dBc to –42.2dBc. For production designs, 0.5V is strongly recommended to meet datasheet specifications.
Is an external coupling capacitor required on the RF output of the LT5572EUF#TRPBF?
Yes-an external AC-coupling capacitor is strongly recommended on the RF output when output power exceeds 3dBm. The internal ESD diode from RF to ground becomes forward-biased at higher RF swings, degrading linearity and causing measurement errors in 1dB compression testing. A 100nF capacitor is used on the DC945A evaluation board.
How does the enable pin (EN) function on the LT5572EUF#TRPBF?
The EN pin on the LT5572EUF#TRPBF controls power state: >1V turns the device fully on (145mA ICC), <0.5V places it in shutdown (50µA ICC). An internal 75kΩ pull-down ensures safe default-off behavior if left unconnected. Exceeding VCC + 0.5V risks sourcing current through ESD diodes and damaging the part.
What is the purpose of the exposed thermal pad (Pin 17) on the LT5572EUF#TRPBF QFN package?
The exposed pad (Pin 17) on the LT5572EUF#TRPBF is electrically and thermally connected to GND. It must be soldered to a large PCB ground plane to ensure proper RF return path, minimize thermal resistance (θJA = 37°C/W), prevent overheating during continuous 4dBm+ operation, and maintain specified noise floor and OIP3 performance.
LT5572EUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Modulator
- LO Frequency:
- 1.5GHz ~ 2.5GHz
- RF Frequency:
- 1.5GHz ~ 2.5GHz
- P1dB:
- 9.3dBm
- Noise Floor:
- -158.6dBm/Hz
- Output Power:
- 1.4dBm
- Current - Supply:
- 145 mA
- Voltage - Supply:
- 4.5V ~ 5.25V
- Test Frequency:
- 2GHz
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
LT5572EUF#TRPBF FAQ
1.How can I place an order for LT5572EUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT5572EUF#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 LT5572EUF#TRPBF reliable?
The price and inventory of LT5572EUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT5572EUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LT5572EUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT5572EUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT5572EUF#TRPBF?
LT5572EUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT5572EUF#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 LT5572EUF#TRPBF?
For technical support, including LT5572EUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT5572EUF#TRPBF requirements.
6.How does Aetrix verify that LT5572EUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT5572EUF#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 LT5572EUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LT5572EUF#TRPBF?
All LT5572EUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT5572EUF#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 LT5572EUF#TRPBF part is unused and in its original packaging.
Return procedure for LT5572EUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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