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Analog Devices Inc. LT5503EFE#TRPBF
- Part No.:
- LT5503EFE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Modulators
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LT5503EFE#TRPBF.pdf
- Description:
- RF MODULATOR 1.7-2.7GHZ 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,918
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Product details
Overview
LT5503EFE#TRPBF from Analog Devices (formerly Linear Technology) is a dual-function RF front-end IC integrating a direct-conversion IQ modulator and an independent double-balanced mixer. It operates with 1.2–2.7GHz modulator output, 120MHz baseband bandwidth, –3dBm P1dB at 2.45GHz, and 4-step digital VGA control up to 13.5dB attenuation - used in IEEE 802.11b WLAN transmitters for carrier generation and modulation.
For engineers reviewing the LT5503EFE#TRPBF datasheet, LT5503EFE#TRPBF pinout, LT5503EFE#TRPBF application, or LT5503EFE#TRPBF equivalent, key selection criteria include its integrated 90° phase shifter, LO2 ÷1/÷2 mode control, differential I/Q input biasing at 1.4V, 20-lead TSSOP package with exposed ground pad, and dual-supply operation (1.8–5.25V).
Technical Context
The LT5503EFE#TRPBF implements a precision quadrature modulator with on-die 90° phase shifter and variable-gain amplifier, enabling direct RF synthesis from baseband I/Q signals without external phase-matching components. Its independent mixer features LO1 (1.4–2.4GHz) and LO2 (50–1000MHz) inputs with DMODE-selectable division ratio (÷1 or ÷2), supporting dual-conversion architectures.
Both modulator and mixer sections share separate supply domains (VCCMOD/VCCRF/VCCVGA and VCCLO1/VCCLO2/VCCRF), enabling independent power sequencing and noise isolation. The modulator's baseband inputs (BI±/BQ±) are internally biased at 1.4V with 18kΩ differential resistance and 0.8pF capacitance, while the mixer outputs (MX±) use open-collector differential configuration requiring external bias chokes and balun matching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Modulator RF Output Range | 1.2GHz to 2.7GHz - supports multiband WLAN/WLL/MMDS systems without external frequency translation |
| P1dB Output Power | –3dBm at 2.45GHz - defines maximum linear output before gain compression in 2.4GHz ISM band |
| Baseband Bandwidth | 120MHz (3dB) - enables wideband modulation formats including OFDM and high-data-rate DSSS |
| VGA Attenuation Steps | 0dB / 4.5dB / 9dB / 13.5dB - digitally controlled via GC2/GC1 pins for precise transmit power management |
| Image Suppression | –26dBc to –34dBc - quantifies sideband rejection performance critical for spectral mask compliance |
| Carrier Suppression | –24dBc to –32dBc - measures residual unmodulated carrier leakage affecting EVM and ACLR |
| Supply Voltage Range | 1.8V to 5.25V - allows operation from single Li-ion battery (3.3V) or higher-voltage rails |
Pinout & Package
LT5503EFE#TRPBF is housed in a 20-lead plastic TSSOP (FE package) with exposed thermal pad (Pin 21) that must be soldered to PCB ground for thermal and electrical integrity. Package dimensions: 6.5mm × 4.4mm × 1.1mm, pitch 0.65mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BQ– / BQ+ | Q-channel differential baseband input | Internally biased at 1.4V; accepts ±1VP-P differential swing; 18kΩ input resistance enables AC-coupled interface |
| BI– / BI+ | I-channel differential baseband input | Same bias and impedance as BQ±; phase-matched path ensures <±1° I/Q skew for low EVM |
| MODIN | Modulator RF carrier input | Single-ended, internally biased; requires AC coupling and external 50Ω matching network |
| MODOUT | Modulator RF output | Open-collector VGA output; requires external choke to VCC and matching network to 50Ω load |
| MX+ / MX– | Mixer differential RF output | Open-collector pair; must be biased via balun center-tap or individual chokes for optimal LO1 suppression |
| LO1 / LO2 | Mixer local oscillator inputs | AC-coupled; LO1 (1.4–2.4GHz) drives mixer core; LO2 (50–1000MHz) feeds ÷1/÷2 divider per DMODE state |
| GC1 / GC2 | VGA gain control bits | CMOS-compatible logic inputs; draw ≤2µA; define 4 discrete attenuation states with 100ns switching |
| MODEN / MIXEN | Section enable controls | Active-high; 1µs turn-on/off; disable respective blocks to reduce quiescent current (MODEN=Low → 50µA) |
| VCCx (5,6,8,15,16) | Domain-specific power supplies | Five dedicated supply pins isolate noise between modulator, VGA, LO buffers, and mixer sections |
| Exposed Pad (21) | Ground return | Thermal and electrical ground; mandatory solder connection to PCB ground plane for θJA = 38°C/W |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 90° phase shifter | Eliminates need for external polyphase filters or hybrid couplers, reducing BOM count and layout sensitivity |
| Independent mixer with LO2 ÷1/÷2 mode | Enables flexible dual-conversion architectures: e.g., LO2=750MHz → ÷2 → 375MHz mixed with LO1=2075MHz → 2450MHz carrier |
| Differential baseband inputs with 1.4V internal bias | Maximizes signal swing at 1.8V supply; eliminates external bias networks for DAC interfacing |
| Four-step digital VGA with 13.5dB range | Provides coarse power control without analog control voltage drift or DAC dependency |
| Separate supply domains per functional block | Prevents supply noise coupling between LO paths, modulator, and VGA - critical for low EVM |
| 20-lead TSSOP with exposed thermal pad | Enables compact RF layout with low-inductance ground path; compatible with standard reflow profiles |
Applications
| IEEE 802.11b WLAN Transmitter | Wireless Local Loop (WLL) Base Station |
|---|---|
Use Scenario: 2.4GHz ISM-band transmitter in access point hardware supporting DSSS/CCK modulation. IC Role / Device Role / Timing Role: Direct IQ modulator generates modulated RF; mixer synthesizes 2.45GHz carrier from lower-frequency LOs. Use Value: Integrated phase shifter and 120MHz bandwidth support 11Mbps data rates with <–30dBc image rejection. | Use Scenario: Fixed wireless broadband link operating in 2.5GHz licensed band with stringent ACLR requirements. IC Role / Device Role / Timing Role: Modulator handles baseband-to-RF conversion; mixer provides carrier generation with LO2 ÷2 mode for improved phase noise. Use Value: –32dBc carrier suppression and –34dBc image rejection meet FCC Part 101 spectral mask limits. |
| MMDS Subscriber Unit | PCS Wireless Data Terminal |
Use Scenario: Outdoor customer premise equipment receiving 2.5–2.7GHz MMDS downlink and transmitting telemetry upstream. IC Role / Device Role / Timing Role: LT5503EFE#TRPBF serves as transmit front-end; modulator processes QPSK symbols; mixer upconverts IF to final band. Use Value: 1.8V minimum supply enables direct battery operation; 4.5dB VGA step enables fine-grained power backoff for dynamic range control. | Use Scenario: Portable PCS band (1850–1990MHz) data modem requiring low-power, high-integration RF solution. IC Role / Device Role / Timing Role: Dual-role IC performs both carrier synthesis (mixer) and modulation (IQ modulator) in single chip. Use Value: Separate VCC domains prevent LO leakage into baseband path; 18kΩ input resistance simplifies DAC interface without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar direct-conversion modulator and mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5375-05ACPZ-R7 | Higher frequency range (300MHz–6GHz), integrated LO buffer, no standalone mixer section | Requires external mixer for dual-conversion; better suited for direct-upconversion architectures | Select when wider RF bandwidth and integrated LO drive are prioritized over on-chip carrier synthesis |
| MAX2022ETX+T | Includes integrated fractional-N synthesizer; 1.7–2.7GHz modulator only; no independent mixer | Reduces external LO count but lacks LT5503EFE#TRPBF's dual-conversion flexibility | Select when system-level integration (synthesizer + modulator) outweighs need for discrete mixer control |
Compared with ADL5375-05ACPZ-R7 and MAX2022ETX+T, the LT5503EFE#TRPBF uniquely combines a full-featured IQ modulator with a separately controllable mixer in one die - enabling true dual-conversion transmitter designs without additional active components or LO routing complexity.
Availability
LT5503EFE#TRPBF is available at Aetrix Electronics and suitable for IEEE 802.11b WLAN transmitters, wireless local loop (WLL) base stations, MMDS subscriber units, and PCS wireless data terminals requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LT5503EFE#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 LT5503EFE#TRPBF belongs to Linear Technology's RF front-end product line, designed specifically for low-voltage, high-accuracy digital modulation in wireless infrastructure and consumer radio systems.
FAQ
What is the operating temperature range for the LT5503EFE#TRPBF?
The LT5503EFE#TRPBF is rated for continuous operation from –40°C to +85°C ambient temperature. This range is guaranteed by design and confirmed through characterization across process corners and statistical process control. The device's thermal resistance (θJA = 38°C/W) and exposed pad grounding ensure reliable performance within this envelope when mounted per recommended PCB layout guidelines.
Does the LT5503EFE#TRPBF require external biasing for its baseband inputs?
No, the LT5503EFE#TRPBF baseband inputs (BI± and BQ±) are internally biased at 1.4V, optimized for maximum differential swing at low supply voltages. External biasing is optional and only needed if driving from a DC-coupled DAC; in that case, the external bias must remain between 1.4V and (VCC – 0.4V) to avoid forward-biasing internal protection diodes.
How does the DMODE pin affect mixer operation in the LT5503EFE#TRPBF?
The DMODE pin selects the division ratio of the LO2 input: logic low configures the internal divider for ÷2 operation (e.g., 750MHz → 375MHz), while logic high bypasses it for ÷1 (750MHz → 750MHz). This directly determines the resulting mixer output frequency when combined with LO1, enabling flexible carrier synthesis across 1.7–2.7GHz without changing external LO sources.
What is the purpose of the exposed pad (Pin 21) on the LT5503EFE#TRPBF?
The exposed pad (Pin 21) serves as the primary ground return and thermal dissipation path for the LT5503EFE#TRPBF. It must be soldered to a solid PCB ground plane to achieve the specified θJA = 38°C/W and ensure stable RF performance. Leaving it unconnected degrades thermal management, increases junction temperature, and may cause gain drift or increased distortion in the modulator and mixer sections.
Can the LT5503EFE#TRPBF's modulator and mixer be used independently?
Yes, the LT5503EFE#TRPBF's modulator and mixer are functionally independent. MODEN and MIXEN pins allow individual enable/disable control. When MODEN = Low, only the mixer remains active - useful for generating carrier signals elsewhere in the system. When MIXEN = Low, only the modulator operates - ideal when MODRFIN is supplied by an external synthesizer rather than the on-chip mixer.
LT5503EFE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Modulator/Mixer
- LO Frequency:
- 1.4GHz ~ 2.4GHz
- RF Frequency:
- 1.7GHz ~ 2.7GHz
- P1dB:
- -15dBm
- Noise Floor:
- -152dBm/Hz
- Output Power:
- 12.7dBm
- Current - Supply:
- 38 mA
- Voltage - Supply:
- 1.8V ~ 5.25V
- Test Frequency:
- 2.4GHz
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
LT5503EFE#TRPBF FAQ
1.How can I place an order for LT5503EFE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT5503EFE#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 LT5503EFE#TRPBF reliable?
The price and inventory of LT5503EFE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT5503EFE#TRPBF is usually 5 days.
3.What payment methods are accepted for LT5503EFE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT5503EFE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT5503EFE#TRPBF?
LT5503EFE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT5503EFE#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 LT5503EFE#TRPBF?
For technical support, including LT5503EFE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT5503EFE#TRPBF requirements.
6.How does Aetrix verify that LT5503EFE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT5503EFE#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 LT5503EFE#TRPBF meets industry standards.
7.What is the process for return or replacement of LT5503EFE#TRPBF?
All LT5503EFE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT5503EFE#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 LT5503EFE#TRPBF part is unused and in its original packaging.
Return procedure for LT5503EFE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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