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Analog Devices Inc. LTC2268IUJ-14#PBF
- Part No.:
- LTC2268IUJ-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2268IUJ-14#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,295
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Product details
Overview
LTC2268IUJ-14#PBF 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 at 125 Msps. It delivers 73.1 dB SNR, 88 dB SFDR, and ultralow 0.15 psRMS aperture jitter, enabling undersampling of IF signals in cellular base stations and software-defined radios.
For engineers reviewing the LTC2268IUJ-14#PBF datasheet, LTC2268IUJ-14#PBF pinout, LTC2268IUJ-14#PBF application, or LTC2268IUJ-14#PBF equivalent, this page provides verified specifications, validated QFN-40 pin functions, real-world timing and noise performance data, and direct alternatives for multichannel RF data acquisition designs requiring industrial temperature range (–40°C to +85°C) operation.
Technical Context
The LTC2268IUJ-14#PBF integrates two independent 14-bit ADC cores with shared PLL-based clock conditioning, a duty-cycle stabilizer for robust encode input tolerance, and dual-channel serial LVDS output serialization (1- or 2-lane per channel). Its 800 MHz full-power bandwidth sample-and-hold supports wideband RF inputs up to 140 MHz while maintaining 73 dB SNR at –1 dBFS.
Digital interface flexibility includes SPI configuration (serial mode) or parallel logic control (parallel mode), selectable 1.75 mA / 3.5 mA LVDS output drive, internal/external reference selection via SENSE pin, and programmable input ranges (1 VP–P to 2 VP–P). Shutdown and Nap modes reduce power to 1 mW and 70 mW respectively.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in precision measurement systems. |
| Sampling Rate | 125 Msps - enables Nyquist sampling of signals up to 62.5 MHz or undersampling of higher IF bands (e.g., 70–140 MHz). |
| SNR @ 70 MHz | 73.1 dBFS - translates to effective resolution of ~12.2 bits at RF input frequencies critical for LTE/WCDMA receiver chains. |
| SFDR @ 70 MHz | 88 dBFS - suppresses harmonics and spurs sufficiently for demanding spectral purity requirements in SDR front ends. |
| Aperture Jitter | 0.15 psRMS - limits sampling uncertainty to <0.01° phase error at 100 MHz, preserving EVM in high-order QAM demodulation. |
| Power Dissipation | 299 mW total at 125 Msps (2-lane, 1.75 mA mode) - enables thermal management in dense multichannel ADC arrays without forced air cooling. |
| Supply Voltage | Single 1.8 V analog (VDD) and digital (OVDD) supply - simplifies power delivery and reduces board-level DC/DC count versus split-supply ADCs. |
Pinout & Package
Package: 40-lead (6 mm × 6 mm) plastic QFN with exposed pad (Pin 41 = GND), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1+, AIN1– | Channel 1 differential analog input | Accepts 1–2 VP–P differential signal; common-mode bias provided by VCM1 (Pin 3). |
| ENC+, ENC– | Differential encode clock input | Triggers conversion on rising/falling edges; supports sine, PECL, LVDS, TTL, CMOS; duty cycle stabilizer enabled. |
| OUT1A+/OUT1A–, OUT1B+/OUT1B– | Channel 1 serial LVDS data outputs | In 2-lane mode: OUT1A carries even bits, OUT1B odd bits; in 1-lane mode only OUT1A active. |
| FR+, FR– | Frame start output | Indicates start of new conversion frame; period equals sampling clock in 2-lane mode, double in 1-lane mode. |
| DCO+, DCO– | Data clock output | Synchronizes serialized LVDS data; frequency = fS/8 (2-lane, 16-bit) or fS/16 (1-lane, 16-bit). |
| PAR/SER | Programming mode select | Ground = serial SPI interface; VDD = parallel logic control of output mode, current, and termination. |
| SDO | Serial data output (open-drain) | Reads back register values in serial mode; enables internal 100 Ω LVDS termination when pulled high in parallel mode. |
| VCM1, VCM2 | Common-mode bias outputs | Nominally VDD/2 (0.9 V); used to bias differential input pairs; requires 0.1 µF bypass to GND. |
| REFH, REFL | ADC reference voltage terminals | Support internal or external reference; require 2.2 µF + 0.1 µF decoupling for low-noise operation. |
| SENSE | Reference programming input | Configures input range: VDD → ±1 V, GND → ±0.5 V, 0.625–1.3 V → ±0.8×VSENSE. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow aperture jitter (0.15 psRMS) | Enables clean undersampling of 100+ MHz IF signals without external jitter cleanup circuitry. |
| Serial LVDS outputs (1- or 2-lane per channel) | Reduces interface trace count by >50% vs parallel CMOS, easing PCB routing and EMI control in high-density RF boards. |
| Internal clock duty cycle stabilizer | Allows reliable operation with encode clocks having 30–70% duty cycle - eliminates need for external clock conditioning ICs. |
| Programmable LVDS output current (1.75/3.5 mA) | Optimizes signal integrity across varying trace lengths and termination schemes without redesigning layout. |
| Flexible reference architecture (internal/external) | Supports ±0.5 V to ±1 V input ranges via SENSE pin; external reference option improves system gain matching in multichip arrays. |
| Industrial temperature grade (–40°C to +85°C) | Validated performance across full range - suitable for outdoor base station, medical imaging, and ruggedized test equipment. |
Applications
| Cellular Base Station Receiver | Software Defined Radio (SDR) Front End |
|---|---|
|
Use Scenario: Digitizing dual-channel 70–80 MHz IF signals from quadrature downconverters in LTE macrocell BTS. IC Role / Device Role / Timing Role: Simultaneous-sampling dual ADC providing time-aligned I/Q data streams with sub-picosecond inter-channel skew. Use Value: 88 dB SFDR prevents adjacent-channel interference masking weak signals; 73.1 dB SNR supports 256-QAM demodulation at –1 dBFS. |
Use Scenario: High-bandwidth signal capture in reconfigurable radio platforms supporting multiple waveforms (FM, DAB, LTE, 5G NR). IC Role / Device Role / Timing Role: Wideband digitizer with programmable input range and LVDS serialization for FPGA interface efficiency. Use Value: 800 MHz full-power bandwidth allows direct sampling of UHF bands; 125 Msps rate supports 60 MHz instantaneous bandwidth. |
| Portable Medical Ultrasound Imaging | Multichannel Data Acquisition System |
|
Use Scenario: Beamforming digitization in handheld ultrasound probes requiring low power and high dynamic range. IC Role / Device Role / Timing Role: Dual-channel ADC capturing echo return signals with precise time-of-flight alignment for spatial resolution. Use Value: 299 mW total power enables battery operation; 73.1 dB SNR preserves tissue contrast in B-mode imaging at 10–15 MHz center frequencies. |
Use Scenario: High-fidelity sensor array digitization in nondestructive testing (NDT) and structural health monitoring systems. IC Role / Device Role / Timing Role: Precision dual ADC with low INL (±1 LSB) and DNL (±0.3 LSB) for calibrated multi-sensor synchronization. Use Value: No missing codes and 1.2 LSBRMS transition noise ensure accurate amplitude linearity across full temperature range (–40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 14-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9250BCPZ-14 | 14-bit, 125 MSPS dual ADC from Analog Devices; uses JESD204B interface instead of LVDS; higher power (525 mW); integrated digital downconverter (DDC). | Requires FPGA with JESD204B support; better suited for systems needing on-chip decimation and channelization. | Choose AD9250BCPZ-14 if JESD204B infrastructure exists and DDC functionality is required; LTC2268IUJ-14#PBF preferred for LVDS simplicity and lower power. |
| ADS52J90IRGCT | Texas Instruments 16-bit, 100 MSPS dual ADC; LVDS interface; higher resolution but lower speed; 325 mW power; no internal reference. | Better for precision instrumentation where SNR > 75 dB is mandatory and 100 MSPS suffices. | Choose ADS52J90IRGCT for applications prioritizing resolution over speed; LTC2268IUJ-14#PBF remains optimal for 125 MSPS RF digitization with balanced SNR/SFDR/power. |
Compared with AD9250BCPZ-14 and ADS52J90IRGCT, the LTC2268IUJ-14#PBF uniquely balances 125 Msps speed, 73.1 dB SNR, 88 dB SFDR, and 299 mW power in an LVDS-based QFN package - making it the most direct fit for cost-sensitive, thermally constrained, multichannel RF receivers requiring industrial temperature operation without JESD204B complexity.
Availability
LTC2268IUJ-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, and multichannel data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2268IUJ-14#PBF 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 digital signal processing technologies for precision and high-speed applications.
The LTC2268IUJ-14#PBF belongs to Linear's high-speed ADC product line, designed specifically for demanding communications and instrumentation systems requiring simultaneous sampling, low jitter, and flexible digital interfacing in compact packages.
FAQ
What is the maximum sampling rate supported by the LTC2268IUJ-14#PBF?
The LTC2268IUJ-14#PBF supports a maximum sampling rate of 125 Msps, as confirmed in its ordering part number suffix "-14" and electrical characteristics table. This rate is achievable in both 1-lane and 2-lane LVDS output modes, with timing constraints ensuring tSER ≥ 1 ns for reliable serialization.
Does the LTC2268IUJ-14#PBF support internal or external voltage reference configurations?
Yes, the LTC2268IUJ-14#PBF supports both internal and external reference modes via the SENSE pin (Pin 38). Connecting SENSE to VDD selects ±1 V input range with internal reference; grounding selects ±0.5 V; applying 0.625–1.3 V selects ±0.8×VSENSE, enabling precise external reference integration.
What is the operating temperature range for the LTC2268IUJ-14#PBF?
The LTC2268IUJ-14#PBF is specified 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. This range is validated for all key AC and DC specifications including SNR, SFDR, INL, and DNL.
How many pins does the LTC2268IUJ-14#PBF use for LVDS data transmission per channel?
The LTC2268IUJ-14#PBF uses four LVDS pins per channel in 2-lane mode: OUT1A+/OUT1A– and OUT1B+/OUT1B– for Channel 1; OUT2A+/OUT2A– and OUT2B+/OUT2B– for Channel 2. In 1-lane mode, only OUT1A+/OUT1A– and OUT2A+/OUT2A– are active, reducing pin count by 50%.
Is the LTC2268IUJ-14#PBF pin-compatible with other members of the LTC226x-14 family?
Yes, the LTC2268IUJ-14#PBF is pin-compatible with the LTC2267IUJ-14#PBF (105 Msps) and LTC2266IUJ-14#PBF (80 Msps) within the same QFN-40 package. All share identical pinout, power domains, reference architecture, and LVDS interface - enabling drop-in speed-grade upgrades without PCB revision.
LTC2268IUJ-14#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC2268IUJ-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2268IUJ-14#PBF 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#PBF reliable?
The price and inventory of LTC2268IUJ-14#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC2268IUJ-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2268IUJ-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2268IUJ-14#PBF?
LTC2268IUJ-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2268IUJ-14#PBF 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#PBF?
For technical support, including LTC2268IUJ-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2268IUJ-14#PBF requirements.
6.How does Aetrix verify that LTC2268IUJ-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2268IUJ-14#PBF 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#PBF meets industry standards.
7.What is the process for return or replacement of LTC2268IUJ-14#PBF?
All LTC2268IUJ-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2268IUJ-14#PBF, 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#PBF part is unused and in its original packaging.
Return procedure for LTC2268IUJ-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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