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Analog Devices Inc. LTC2256IUJ-14#TRPBF
- Part No.:
- LTC2256IUJ-14#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2256IUJ-14#TRPBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:287
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Product details
Overview
LTC2256IUJ-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 25Msps ultralow-power analog-to-digital converter with 74dB SNR, 88dB SFDR, and 800MHz full-power bandwidth. It operates from a single 1.8V supply, supports CMOS/DDR CMOS/DDR LVDS outputs, and targets high-dynamic-range signal digitization in portable medical imaging and multi-channel data acquisition systems.
For engineers reviewing the LTC2256IUJ-14#TRPBF datasheet, LTC2256IUJ-14#TRPBF pinout, LTC2256IUJ-14#TRPBF application, or LTC2256IUJ-14#TRPBF equivalent, this page delivers verified specifications, validated pin functions, real-world use cases, and confirmed alternative options for RF-sampling ADC selection in temperature-stressed industrial and communications designs.
Technical Context
The LTC2256IUJ-14#TRPBF implements a pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable digital output drivers. Its 0.17psRMS aperture jitter enables undersampling of IF frequencies up to 140MHz while maintaining 73.1dB SNR at 140MHz input.
It features dual programming modes (serial SPI or parallel logic), optional clock duty cycle stabilizer, data output randomizer, and low-power Nap (9mW) and Sleep (0.5mW) modes. Input range is selectable from 1VP-P to 2VP-P via the SENSE pin, and reference can be internal or external (0.625V–1.3V).
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 | 25Msps - optimized for medium-bandwidth applications like portable ultrasound and NDT where power efficiency outweighs ultra-high speed. |
| SNR / SFDR | 73.1dB SNR / 88dB SFDR at 140MHz input - enables clean digitization of wideband signals without harmonic contamination in spectrum-sensitive receivers. |
| Power Dissipation | 35mW at 25Msps (LVDS mode, 1.75mA) - reduces thermal load and simplifies thermal design in space-constrained portable equipment. |
| Analog Input BW | 800MHz full-power bandwidth - supports direct RF sampling of L-band and lower S-band signals without external amplification or filtering. |
| Supply Voltage | Single 1.8V analog (VDD) and 1.2–1.9V output (OVDD) supplies - eliminates need for multiple rail generation and eases PCB power delivery. |
| INL / DNL | ±1LSB INL / ±0.3LSB DNL (typ) - ensures accurate amplitude fidelity in calibrated instrumentation and medical imaging front ends. |
Pinout & Package
40-pin (6mm × 6mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41 = GND). Pin functions are consistent across output modes except for data pins, which differ between CMOS and LVDS configurations.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– (1, 2) | Differential analog input pair | Accepts 1–2VP-P differential signal; common-mode bias set by VCM (Pin 37); supports DC-coupled or AC-coupled inputs with >80dB CMRR. |
| ENC+, ENC– (11, 12) | Differential encode clock inputs | Trigger conversion on rising/falling edges; accept PECL/LVDS/TTL/CMOS; optional duty cycle stabilizer improves timing margin at full speed. |
| PAR/SER (8) | Programming mode select | Pull to GND for SPI control (CS/SCK/SDI/SDO active); pull to VDD for parallel mode (CS/SCK/SDI repurposed for function control). |
| VDD (9, 10, 40) | Analog supply | 1.7–1.9V operation; requires local 0.1µF ceramic bypass per pin; shared ground with GND (Pin 3) and OGND (Pin 25). |
| OVDD (26) | Digital output supply | Configurable 1.2–1.9V for CMOS outputs or fixed 1.8V for LVDS; sets output swing and current drive strength. |
| SENSE (39) | Reference and input range selector | Connect to VDD → ±1V range; to GND → ±0.5V range; apply 0.625–1.3V → ±0.8× applied voltage - enables precise gain calibration. |
| VCM (37) | Common-mode bias output | Nominally VDD/2 ±25mV; used to bias AIN+/AIN–; must be bypassed with 0.1µF capacitor to reduce noise coupling. |
| REFH/REFL (4–7) | Reference voltage terminals | Support internal or external reference; require 2.2µF + 0.1µF bypass network between REFH/REFL and GND for stable reference operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow jitter (0.17psRMS) | Enables undersampling of 70–140MHz IF signals with minimal noise floor degradation in SDR and base station receivers. |
| Selectable output interface | Full-rate CMOS, DDR CMOS, or DDR LVDS - allows trade-off between power, noise immunity, and board routing complexity. |
| On-chip clock duty cycle stabilizer | Compensates for asymmetric clock sources without external circuitry, preserving timing margin at 25Msps with <500ns max duty cycle error. |
| Serial SPI configuration port | Enables runtime reconfiguration of output format, randomizer, and power modes - critical for adaptive test equipment and field-upgradable systems. |
| Low-power Nap and Sleep modes | Reduces power to 9mW (Nap) or 0.5mW (Sleep) - extends battery life in portable diagnostics and handheld NDT tools. |
Applications
| Portable Medical Ultrasound | Multi-Channel Data Acquisition |
|---|---|
Use Scenario: Digitizing echo return signals from phased-array transducers in handheld ultrasound units. IC Role / Device Role / Timing Role: Primary ADC capturing 10–20MHz bandwidth RF echoes with <74dB SNR to preserve tissue contrast resolution. Use Value: 25Msps sampling rate matches typical beamforming latency requirements while 35mW dissipation avoids thermal drift in compact enclosures. |
Use Scenario: Simultaneous sampling across 8+ sensor channels in industrial condition monitoring systems. IC Role / Device Role / Timing Role: Channel-isolated ADC providing synchronized 14-bit samples with <±1LSB INL for vibration and temperature analytics. Use Value: Pin-compatible family (LTC2256/LTC2257/LTC2258) allows scalable channel count without layout redesign. |
| Nondestructive Testing (NDT) | Software Defined Radio (SDR) Receivers |
Use Scenario: Capturing pulsed ultrasonic waveforms reflected from subsurface flaws in aerospace composites. IC Role / Device Role / Timing Role: High-fidelity digitizer with 800MHz input bandwidth enabling time-of-flight analysis down to 1ns resolution. Use Value: 88dB SFDR suppresses harmonic artifacts from high-voltage pulse excitation, improving flaw detection sensitivity. |
Use Scenario: Direct RF sampling of 70–100MHz IF signals in military-grade SDR transceivers. IC Role / Device Role / Timing Role: Undersampling ADC with 0.17psRMS jitter preserving EVM in QAM-64/256 modulated waveforms. Use Value: Internal reference and SENSE-programmable input range simplify calibration in field-deployable radios with variable antenna coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS5272IPFP | 14-bit, 25Msps, 73.5dB SNR, 3.3V analog supply, LVDS-only outputs, no internal reference | Requires external reference and level-shifting for 1.8V logic; higher power (120mW) but better SFDR (92dB) | Choose when SFDR >90dB is mandatory and system already uses 3.3V supplies and LVDS infrastructure. |
| LTC2257IUJ-14#TRPBF | Same family, 40Msps, 73.7dB SNR, 49mW power, identical pinout and feature set | Higher speed with proportional power increase; same footprint and software compatibility | Choose when system requires 40Msps sampling without changing PCB layout or firmware interface. |
Compared with ADS5272IPFP, LTC2256IUJ-14#TRPBF offers lower supply voltage, integrated reference, and flexible output modes at the cost of slightly lower SFDR; compared with LTC2257IUJ-14#TRPBF, it trades 15Msps speed for 14mW lower power and reduced thermal load in battery-powered deployments.
Availability
LTC2256IUJ-14#TRPBF is available at Aetrix Electronics and suitable for portable medical imaging, nondestructive testing, and multi-channel data acquisition requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2256IUJ-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and DSP solutions, serving precision instrumentation, communications, and industrial markets.
The LTC2256IUJ-14#TRPBF belongs to the LTC225x family of ultralow-power, high-SNR ADCs designed specifically for portable and thermally constrained RF-sampling applications demanding 14-bit accuracy at 25–65Msps.
FAQ
What is the operating temperature range of the LTC2256IUJ-14#TRPBF?
The LTC2256IUJ-14#TRPBF is rated for –40°C to +85°C (Industrial grade), as indicated by the "I" suffix in the part number. This range is validated across all key specifications including SNR, SFDR, INL, and power consumption, making it suitable for deployment in outdoor industrial sensors and vehicle-mounted diagnostic tools where ambient temperatures fluctuate widely.
Does the LTC2256IUJ-14#TRPBF support external reference operation?
Yes, the LTC2256IUJ-14#TRPBF supports external reference operation via the SENSE pin (Pin 39). Applying a voltage between 0.625V and 1.3V to SENSE configures the input range to ±0.8× that voltage, enabling precise gain matching in calibrated systems. The internal reference remains active unless explicitly disabled through SPI register control.
How does the PAR/SER pin affect functionality of the LTC2256IUJ-14#TRPBF?
The PAR/SER pin (Pin 8) selects between two configuration interfaces: tied to GND enables full SPI control (CS/SCK/SDI/SDO), while tied to VDD enables parallel mode where CS, SCK, and SDI become dedicated logic inputs for clock stabilizer, output mode, and sleep control respectively - simplifying FPGA/GPIO-based systems without serial peripherals.
Can the LTC2256IUJ-14#TRPBF be used in undersampling applications?
Yes, the LTC2256IUJ-14#TRPBF is explicitly designed for undersampling with its 800MHz full-power bandwidth and 0.17psRMS aperture jitter. At 25Msps, it can cleanly digitize IF signals up to 140MHz (Nyquist zone 3), as confirmed by FFT plots showing 73.1dB SNR and 88dB SFDR at that frequency in the official datasheet.
What are the power supply requirements for the LTC2256IUJ-14#TRPBF?
The LTC2256IUJ-14#TRPBF requires a 1.7–1.9V analog supply (VDD) on Pins 9, 10, and 40, and a separate 1.2–1.9V digital output supply (OVDD) on Pin 26. Both supplies must be locally bypassed: VDD with 0.1µF ceramics per pin, OVDD with one 0.1µF ceramic, and REFH/REFL with 2.2µF + 0.1µF networks to GND.
LTC2256IUJ-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):
- 25M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 40-QFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2256IUJ-14#TRPBF FAQ
1.How can I place an order for LTC2256IUJ-14#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2256IUJ-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 LTC2256IUJ-14#TRPBF reliable?
The price and inventory of LTC2256IUJ-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 LTC2256IUJ-14#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2256IUJ-14#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2256IUJ-14#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2256IUJ-14#TRPBF?
LTC2256IUJ-14#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2256IUJ-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 LTC2256IUJ-14#TRPBF?
For technical support, including LTC2256IUJ-14#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2256IUJ-14#TRPBF requirements.
6.How does Aetrix verify that LTC2256IUJ-14#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2256IUJ-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 LTC2256IUJ-14#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2256IUJ-14#TRPBF?
All LTC2256IUJ-14#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2256IUJ-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 LTC2256IUJ-14#TRPBF part is unused and in its original packaging.
Return procedure for LTC2256IUJ-14#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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