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Analog Devices Inc. DC2693A
- Part No.:
- DC2693A
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF, RFID, Wireless Evaluation Boards
- Package:
- Datasheet:
-
DC2693A.pdf
- Description:
- LTC5556 - 1.5GHZ TO 7GHZ DUAL PR
- Quantity:
- Payment:
- Shipping:
Inventory:1,783
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Product details
Overview
LTC5556 from Analog Devices is a dual-channel, programmable-gain downconverting mixer IC designed for high-frequency MIMO and diversity receivers. It delivers 9dB power conversion gain, 32dBm output IP3, and 15.5dB IF digital VGA range in 0.5dB steps across 3GHz–7GHz RF and 1MHz–900MHz IF bands, operating from a single 3.3V supply in –40°C to 105°C environments.
For engineers reviewing the LTC5556 datasheet, LTC5556 pinout, LTC5556 application, or LTC5556 equivalent, this page provides verified technical context, SPI-controlled gain programming details, channel isolation performance at 44dB, RF-to-LO leakage <–46dBm, and design guidance for 5G NR, LTE-U, and DAS receiver front-ends.
Technical Context
The LTC5556 integrates two independent active mixers with differential LO inputs (LO+/LO–), single-ended RF inputs (RF1/RF2), and cascaded IF signal paths featuring open-collector mixer outputs (MO1±/MO2±) followed by differential IF buffer outputs (IF1±/IF2±) and digitally programmable attenuators (AI1±/AI2±). Each channel supports fast enable/disable via EN1/EN2 with sub-microsecond turn-on/off timing.
Its SPI interface (CSB/CLK/SDI/SDO) configures IF attenuation in precise 0.5dB steps across a 15.5dB range, while RP pin enables hardware-selectable reduced-power mode. The device uses internal biasing for RF and IF ports, requiring external DC-blocking capacitors and VCC pull-up inductors on all open-collector outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RF Frequency Range | 1.5GHz to 7GHz - supports 5G FR1, LTE-U (5.1–5.9GHz), and satellite uplink bands with external matching networks. |
| IF Frequency Range | 1MHz to 900MHz - enables direct sampling of wideband IF signals up to 900MHz without additional IF amplification stages. |
| Conversion Gain | Up to 9.7dB at 5.5GHz RF - provides sufficient gain to drive ADCs directly while minimizing noise figure degradation. |
| Output IP3 | 32dBm typical - ensures robust linearity in dense multi-carrier environments such as macrocell base stations. |
| IF Gain Control | 15.5dB range in 0.5dB steps via SPI - enables fine-grained dynamic range management for AGC loops in MIMO receivers. |
| Channel Isolation | 44dB at 3.6GHz - prevents crosstalk between parallel receive chains in spatially multiplexed systems. |
| Supply Voltage | 3.3V single supply - simplifies power delivery architecture versus dual-supply mixer solutions. |
Pinout & Package
32-lead (5mm × 5mm) plastic QFN package with exposed thermal pad (Pin 33 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RF1, RF2 | Single-ended RF inputs | Internally biased to VCC/2; require series DC-blocking capacitors and external matching networks per frequency band. |
| LO+, LO– | Differential LO input | 50Ω internally matched; accepts single-ended or differential LO drive; requires DC-blocking if LO source has DC offset. |
| MO1±, MO2± | Open-collector mixer outputs | Require VCC pull-up inductors (~680nH); deliver differential IF signal pre-attenuation with ~28mA quiescent current per channel. |
| AI1±, AI2± | Differential IF attenuator inputs | Accept buffered IF from MO pins; internally biased to VCC/2; require DC-blocking before attenuator stage. |
| IF1±, IF2± | Differential IF buffer outputs | Open-collector outputs needing VCC pull-up inductors; deliver final IF signal with ~47mA per channel; compatible with 100Ω differential loads. |
| EN1, EN2 | Channel enable controls | CMOS logic inputs with 330kΩ internal pull-down; enable/disable channels independently with <0.3µs turn-on time. |
| CSB, CLK, SDI, SDO | SPI interface | 3.3V-tolerant CMOS interface; supports 20MHz clock; allows real-time IF gain reconfiguration without interrupting RF operation. |
| RP | Reduced power mode select | Hardware override for low-power mode; high logic level forces both channels into reduced current state regardless of SPI setting. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-channel MIMO architecture | Independent RF/LO/IF paths with 44dB inter-channel isolation enable simultaneous multi-antenna reception without cross-coupling. |
| 0.5dB-step programmable IF gain | 16-bit SPI register allows precise AGC implementation with minimal quantization error in closed-loop receiver designs. |
| Wide IF bandwidth support | 900MHz maximum IF output bandwidth permits direct digitization of wide instantaneous bandwidths in test equipment and broadband receivers. |
| Low LO leakage | <–46dBm LO-to-RF leakage reduces spurious emissions and eases filtering requirements in sensitive front-end architectures. |
| Thermal ruggedness | Rated for –40°C to 105°C case temperature with 150°C junction limit - suitable for outdoor base station and industrial wireless infrastructure. |
| Flexible power modes | Full-power (380mA both channels), reduced-power (290mA), and shutdown (1.2mA) modes allow dynamic power scaling based on traffic load. |
Applications
| 5G Massive MIMO Base Stations | LTE-U Small Cell Access Points |
|---|---|
|
Use Scenario: Dual-polarized antenna arrays in 3.5GHz TDD base stations requiring independent I/Q downconversion per stream. IC Role / Device Role / Timing Role: Primary RF-to-IF downconverter with integrated IF gain control for each polarization path. Use Value: 9.7dB conversion gain at 3.6GHz and 44dB channel isolation maintain EVM integrity across 100MHz channels under multi-user MIMO loading. |
Use Scenario: Indoor enterprise small cells operating in unlicensed 5.2–5.9GHz spectrum with coexistence challenges. IC Role / Device Role / Timing Role: High-linearity downconverter enabling simultaneous LTE-U and Wi-Fi monitoring in shared front-end architectures. Use Value: 32dBm OIP3 and <–46dBm LO leakage suppress adjacent-channel interference while supporting dynamic spectrum access protocols. |
| Distributed Antenna Systems (DAS) | Network Test & Monitoring Equipment |
|
Use Scenario: Remote radio units in fiber-fed DAS deployments covering stadiums or transportation hubs. IC Role / Device Role / Timing Role: Low-noise, wide-dynamic-range mixer for centralized IF distribution over coaxial or optical links. Use Value: 15.5dB IF gain range in 0.5dB steps enables precise calibration of path loss variations across dozens of remote nodes. |
Use Scenario: Portable spectrum analyzers and signal intelligence receivers needing rapid frequency agility and wide IF bandwidth. IC Role / Device Role / Timing Role: Reconfigurable downconverter supporting swept-tuned and real-time FFT-based analysis modes. Use Value: 900MHz IF bandwidth and 20MHz SPI clock allow fast gain updates during frequency sweeps without interrupting acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel downconverting mixer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC5566 | Optimized for 300MHz–4.5GHz RF range and 500MHz max IF; lower RF upper limit but better low-band NF. | Better suited for sub-3GHz cellular infrastructure (e.g., 700MHz LTE) where IF bandwidth ≤500MHz suffices. | Select LTC5566 when operating below 3GHz RF or when lower noise figure at 700MHz–2.5GHz is prioritized over 5G mmWave readiness. |
| HMC1040LP5E | Single-channel, 2–18GHz RF range; no integrated IF VGA; requires external IF amplification and gain control. | Used in wideband military/comms receivers where ultra-wide RF coverage outweighs integration benefits. | Choose HMC1040LP5E only when >7GHz RF operation is required and board space allows discrete IF gain staging. |
Compared with LTC5566 and HMC1040LP5E, the LTC5556 uniquely balances 3–7GHz 5G readiness, integrated 0.5dB-step IF gain control, and dual-channel isolation-making it optimal for compact, software-defined MIMO receivers where RF band agility and digital calibration are critical.
Availability
LTC5556 is available at Aetrix Electronics and suitable for 5G base station development, LTE-U small cell deployment, and distributed antenna system integration requiring stable component supply and long-term production continuity.
Supply support for LTC5556 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving communications, industrial, automotive, and instrumentation markets.
The LTC5556 belongs to Analog Devices' high-frequency RF mixer product line, engineered specifically for next-generation wireless infrastructure requiring precision gain control, wide IF bandwidth, and thermal resilience in compact form factors.
FAQ
What is the RF frequency range supported by the LTC5556?
The LTC5556 supports an RF input frequency range from 1.5GHz to 7GHz, with optimal performance between 3GHz and 7GHz. External matching networks (as specified in the datasheet's Table on page 14) are required to achieve >10dB return loss across sub-bands including 1.5–2.1GHz, 2.2–3.2GHz, and 2.6–6.4GHz. The LTC5556 maintains usable performance up to 8GHz with degraded parameters.
How does the LTC5556 implement programmable IF gain control?
The LTC5556 implements programmable IF gain control through a 16-bit SPI interface that adjusts a digital variable-gain amplifier (DVGA) in precise 0.5dB steps across a 15.5dB total range. Each channel (CH1/CH2) is controlled independently via dedicated AI1±/AI2± differential inputs. The LTC5556 also supports hardware override using the RP pin to force reduced-power mode regardless of SPI settings.
What are the power supply requirements for the LTC5556?
The LTC5556 requires two distinct supplies: a 3.3V analog supply (VCC1/VCC2) for RF/IF signal paths consuming up to 450mA in full-power dual-channel mode, and a separate 1.8V–3.3V digital supply (VDD) for the SPI interface drawing <1mA active or <500µA idle. All supplies must be locally bypassed with low-ESR capacitors placed near their respective pins.
Can the LTC5556 be used in single-channel configurations?
Yes, the LTC5556 supports single-channel operation by disabling one channel via its dedicated enable pin (EN1 or EN2). When only one channel is active, supply current drops to 225mA (full power) or 145mA (reduced power), and RF/IF performance remains identical to dual-channel operation. Unused RF/IF ports must be 50Ω-terminated to preserve matching and isolation.
What is the significance of the exposed thermal pad (Pin 33) on the LTC5556?
The exposed thermal pad (Pin 33) on the LTC5556 serves as both electrical ground and primary thermal conduction path. It must be soldered to a solid copper ground plane on the PCB using a grid of thermal vias to ensure junction temperature remains within the 150°C limit under full-power operation. Failure to properly connect Pin 33 degrades thermal performance and may trigger premature thermal shutdown or parametric drift.
DC2693A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Type:
- Mixer, Downconversion
- Frequency:
- 1.5GHz ~ 7GHz
- Contents:
- Board(s)
- Utilized IC / Part:
- LTC5556
DC2693A FAQ
1.How can I place an order for DC2693A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC2693A 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 DC2693A reliable?
The price and inventory of DC2693A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC2693A is usually 5 days.
3.What payment methods are accepted for DC2693A?
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4.How is shipping managed for DC2693A?
DC2693A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC2693A 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 DC2693A?
For technical support, including DC2693A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC2693A requirements.
6.How does Aetrix verify that DC2693A is sourced from the original manufacturer or authorized distributors?
All DC2693A 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 DC2693A meets industry standards.
7.What is the process for return or replacement of DC2693A?
All DC2693A units undergo pre-shipment inspection (PSI). If there is an issue with DC2693A, 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 DC2693A part is unused and in its original packaging.
Return procedure for DC2693A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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