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Analog Devices Inc. LTC2268IUJ-14#TRPBF
- Part No.:
- LTC2268IUJ-14#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2268IUJ-14#TRPBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,988
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Product details
Overview
LTC2268IUJ-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, dual-channel, simultaneous-sampling analog-to-digital converter optimized for high-frequency communications signal digitization. It delivers 73.1dB SNR, 88dB SFDR, and ultralow 0.15psRMS aperture jitter at 125Msps sampling rate, operating from a single 1.8V supply in a 40-pin QFN package. It is deployed in cellular base station receivers requiring precise IF undersampling.
For engineers reviewing the LTC2268IUJ-14#TRPBF datasheet, LTC2268IUJ-14#TRPBF pinout, LTC2268IUJ-14#TRPBF application, or LTC2268IUJ-14#TRPBF equivalent, key selection criteria include guaranteed ±1LSB INL over –40°C to +85°C, serial LVDS 2-lane/1-lane programmable output architecture, 800MHz full-power bandwidth, and SPI-configurable shutdown/nap modes for power-sensitive multichannel systems.
Technical Context
The LTC2268IUJ-14#TRPBF integrates two independent 14-bit ADC cores with shared PLL-based clocking and a digital serializer driving differential LVDS outputs. Its sample-and-hold front-end supports 800MHz full-power bandwidth and accepts differential analog inputs from 1VP–P to 2VP–P, with internal or external reference selection via the SENSE pin.
It features a configurable encode interface accepting differential (LVDS/PECL) or single-ended (TTL/CMOS) clocks, plus an internal duty cycle stabilizer enabling full-speed operation across wide input duty cycles. Digital configuration is performed via a 3-wire SPI port supporting readback, while parallel programming mode allows hardware control of serialization and output current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes over temperature - ensures monotonicity and full dynamic range utilization in precision measurement. |
| Sampling Rate | 125Msps - enables direct digitization of wideband IF signals up to ~60MHz Nyquist zone in communications receivers. |
| SNR @ 70MHz | 73.1dBFS - provides >12 effective bits of resolution for high-fidelity signal capture in demanding RF applications. |
| SFDR @ 70MHz | 88dBFS - suppresses harmonics and spurs critical for adjacent-channel interference rejection in multi-carrier systems. |
| Aperture Jitter | 0.15psRMS - minimizes sampling uncertainty, enabling clean undersampling of 100+ MHz IFs without SNR degradation. |
| Power Dissipation | 299mW total at 125Msps, 2-lane mode - balances performance and thermal management in dense PCB layouts. |
| Supply Voltage | Single 1.8V analog (VDD) and 1.8V output (OVDD) - simplifies power delivery and reduces board-level noise coupling. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN with exposed pad (Pin 41 = GND), rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1+, AIN1– | Channel 1 differential analog input | Accepts 1–2VP–P differential signal; requires VCM1 bias for common-mode setting. |
| AIN2+, AIN2– | Channel 2 differential analog input | Independent second channel with identical AC/DC specs; enables true simultaneous sampling. |
| ENC+, ENC– | Differential encode clock input | Triggers conversion on both edges; internal duty cycle stabilizer relaxes clock source requirements. |
| OUT1A+/–, OUT1B+/– | Channel 1 serialized LVDS data outputs | 2-lane mode uses both pairs; 1-lane mode disables B-pair - reduces routing complexity at lower data rates. |
| OUT2A+/–, OUT2B+/– | Channel 2 serialized LVDS data outputs | Matched delay to Channel 1 outputs ensures deterministic inter-channel timing alignment. |
| DCO+, DCO– | Data clock output | Source-synchronous clock for LVDS data recovery; cycle-cycle jitter ≤60psP–P at 1GHz data rate. |
| FR+, FR– | Frame start output | Indicates start of new conversion frame; used for synchronization across multiple ADCs or FPGA capture logic. |
| PAR/SER | Programming mode select | Ground = serial SPI mode; VDD = parallel hardware mode - enables configuration without microcontroller overhead. |
| SDO | SPI data output / LVDS termination enable | In parallel mode, drives internal 100Ω LVDS terminations - eliminates need for external resistors on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Guarantees matched gain, offset, and phase between channels - essential for I/Q demodulation and beamforming. |
| Programmable LVDS output mode | 1-lane (16-bit) or 2-lane (8-bit) serialization per channel - adapts data bus width to FPGA resource constraints. |
| Selectable input range (1–2VP–P) | Configured via SENSE pin voltage - supports flexible front-end amplifier design without external scaling networks. |
| Internal clock duty cycle stabilizer | Enables full 125Msps performance with 40%–60% input clock duty cycle - relaxes clock generator design requirements. |
| Low-power sleep and nap modes | 1mW sleep / 70mW nap - enables rapid power-state transitions in time-division systems like TDD radios. |
Applications
| Cellular Base Station Receiver | Software Defined Radio (SDR) |
|---|---|
Use Scenario: Digitizing dual-path IF signals (e.g., 70MHz and 75MHz) in LTE/FDD or 5G NR macrocell transceivers. IC Role / Device Role / Timing Role: Dual-channel ADC capturing synchronized I/Q samples with <10ps inter-channel skew for coherent signal processing. Use Value: 88dB SFDR prevents adjacent carrier interference; 0.15psRMS jitter maintains EVM under tight 5G modulation masks. | Use Scenario: Reconfigurable wideband receiver in military or test equipment supporting multiple waveforms (e.g., FM, OFDM, pulsed radar). IC Role / Device Role / Timing Role: High-dynamic-range digitizer enabling real-time spectrum analysis and adaptive filtering across 10MHz–200MHz instantaneous bandwidth. Use Value: 73.1dB SNR preserves low-level signal integrity; 800MHz input bandwidth supports direct IF sampling without image-reject mixers. |
| Portable Medical Ultrasound | Multichannel Data Acquisition |
Use Scenario: Beamformed echo digitization in handheld ultrasound probes using 16–32 receive channels. IC Role / Device Role / Timing Role: Low-power, high-linearity ADC enabling compact, battery-operated systems with minimal thermal dissipation. Use Value: 299mW total power at 125Msps extends battery life; ±1LSB INL ensures accurate tissue contrast mapping across temperature. | Use Scenario: High-channel-count instrumentation for vibration analysis or power quality monitoring with synchronized analog inputs. IC Role / Device Role / Timing Role: Simultaneously sampled ADC pair providing deterministic timestamp alignment across sensor arrays. Use Value: Pipeline latency of exactly 6 cycles enables precise time-of-arrival correlation; SPI configurability supports field calibration updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 14-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9250BCPZ-14 | 14-bit, dual 125Msps; JESD204B serial interface instead of LVDS; higher power (550mW); integrated digital downconverter. | Targets FPGA-based systems with JESD204B PHY; less suitable for legacy LVDS-only interfaces or space-constrained boards. | Choose AD9250BCPZ-14 when JESD204B bandwidth efficiency and on-chip DDC offload justify added complexity and power. |
| LTC2267IUJ-14#TRPBF | Same pinout and feature set, but rated for 105Msps max sampling rate; lower power (243mW); identical INL/DNL and SFDR specs. | Used where 105Msps meets system bandwidth needs - reduces power and simplifies clock design without sacrificing linearity. | Choose LTC2267IUJ-14#TRPBF for cost-optimized or thermally constrained designs where 105Msps suffices. |
Compared with LTC2267IUJ-14#TRPBF and AD9250BCPZ-14, the LTC2268IUJ-14#TRPBF uniquely delivers maximum 125Msps performance in an LVDS-output, SPI-configurable, 40-pin QFN package - making it optimal for high-speed, low-latency, FPGA-connected communications receivers requiring minimal layout footprint and deterministic timing.
Availability
LTC2268IUJ-14#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and multichannel test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2268IUJ-14#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving communications, industrial, automotive, and healthcare markets.
The LTC2268IUJ-14#TRPBF belongs to ADI's high-speed precision ADC product line, engineered specifically for wideband communications receivers demanding ultra-low jitter, high SFDR, and simultaneous dual-channel sampling in compact, low-power packages.
FAQ
What is the maximum sampling rate supported by the LTC2268IUJ-14#TRPBF?
The LTC2268IUJ-14#TRPBF supports a maximum sampling rate of 125Msps, as confirmed in its ordering information and electrical characteristics tables. This rate applies specifically to the LTC2268-14 speed grade; the pin-compatible LTC2267-14 and LTC2266-14 variants support 105Msps and 80Msps respectively. The device maintains full AC performance specifications-including 73.1dB SNR and 88dB SFDR-at this maximum rate when operated with proper power supply decoupling and signal integrity controls.
Does the LTC2268IUJ-14#TRPBF support both internal and external voltage references?
Yes, the LTC2268IUJ-14#TRPBF supports both internal and external reference configurations via the SENSE pin. Connecting SENSE to VDD selects the internal reference with ±1V input range; connecting to GND selects ±0.5V range; applying 0.625V–1.3V to SENSE sets an input range of ±0.8 × VSENSE. The internal reference provides 1.25V ±2.5% with ±25ppm/°C drift, while external reference mode retains ±1LSB INL and 1.2LSBRMS transition noise performance.
How does the LVDS output interface of the LTC2268IUJ-14#TRPBF operate in 1-lane versus 2-lane mode?
In 2-lane mode, the LTC2268IUJ-14#TRPBF outputs two bits per channel per clock edge on separate differential pairs (e.g., OUT1A+/– and OUT1B+/–), achieving 250Mbps per lane at 125Msps. In 1-lane mode, only the A-pair is active (e.g., OUT1A+/–), transmitting one bit per channel per edge at 125Mbps, reducing PCB routing density and FPGA pin count. Mode selection is controlled by the CS pin in parallel programming mode, and output current (1.75mA or 3.5mA) is set via SCK.
What is the purpose of the DCO+ and DCO– pins on the LTC2268IUJ-14#TRPBF?
The DCO+ and DCO– pins on the LTC2268IUJ-14#TRPBF provide a source-synchronous differential clock aligned to the serialized LVDS data outputs. This clock has ≤60psP–P cycle-cycle jitter and is used by receiving logic (e.g., FPGA IDELAY/ISERDES) to reliably recover data. Unlike the encode clock (ENC+/–), DCO is derived from the internal serializer and tracks data eye centering-critical for maintaining timing margin in high-speed LVDS links.
Can the LTC2268IUJ-14#TRPBF be used in systems requiring operation from –40°C to +85°C?
Yes, the LTC2268IUJ-14#TRPBF is explicitly rated for industrial temperature operation from –40°C to +85°C, as indicated by the "I" grade in its part number and confirmed in the Absolute Maximum Ratings table. All key DC and AC specifications-including ±1LSB INL, ±0.3LSB DNL, 73.1dB SNR, and 88dB SFDR-are guaranteed over this full range, making it suitable for outdoor base stations, industrial DAQ, and mobile medical devices without derating.
LTC2268IUJ-14#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 125M
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- LVDS - Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 40-QFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2268IUJ-14#TRPBF FAQ
1.How can I place an order for LTC2268IUJ-14#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2268IUJ-14#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 LTC2268IUJ-14#TRPBF reliable?
The price and inventory of LTC2268IUJ-14#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2268IUJ-14#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2268IUJ-14#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2268IUJ-14#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2268IUJ-14#TRPBF?
LTC2268IUJ-14#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2268IUJ-14#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 LTC2268IUJ-14#TRPBF?
For technical support, including LTC2268IUJ-14#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2268IUJ-14#TRPBF requirements.
6.How does Aetrix verify that LTC2268IUJ-14#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2268IUJ-14#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 LTC2268IUJ-14#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2268IUJ-14#TRPBF?
All LTC2268IUJ-14#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2268IUJ-14#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 LTC2268IUJ-14#TRPBF part is unused and in its original packaging.
Return procedure for LTC2268IUJ-14#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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