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Analog Devices Inc. LTC2256IUJ-14
- Part No.:
- LTC2256IUJ-14
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2256IUJ-14.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,712
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Product details
Overview
LTC2256IUJ-14 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 datasheet, LTC2256IUJ-14 pinout, LTC2256IUJ-14 application, or LTC2256IUJ-14 equivalent, this page delivers verified AC/DC performance specs, package mapping to the 40-pin 6mm × 6mm QFN, SPI configuration capability, and validated alternatives for precision sampling at 25Msps.
Technical Context
The LTC2256IUJ-14 implements a pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable digital output drivers. Its 0.17psRMS jitter enables undersampling of IF frequencies up to 140MHz while maintaining 73.1dB SNR at 140MHz input.
It features dual reference modes (internal 1.25V ±25ppm/°C or external 0.625–1.3V), selectable 1VP-P to 2VP-P input range via SENSE pin, and programmable clock duty cycle stabilization. Power management includes Nap (9mW) and Sleep (0.5mW) modes for system-level energy optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in demanding measurement applications. |
| Sampling Rate | 25Msps - fixed maximum rate for this variant; enables real-time capture of baseband and low-IF signals without interpolation. |
| SNR / SFDR | 73.1dB SNR / 88dB SFDR at 140MHz input - defines usable dynamic range for spectral analysis and communication signal integrity. |
| Power Dissipation | 35mW at 25Msps (sine input, OVDD=1.2V) - enables battery-powered or thermally constrained embedded systems. |
| Input Bandwidth | 800MHz full-power bandwidth - supports direct sampling of wideband analog inputs without external amplification or filtering. |
| Analog Supply | Single 1.8V (1.7–1.9V) VDD - simplifies power delivery and reduces board-level DC/DC complexity versus dual-supply ADCs. |
| Digital Outputs | Configurable CMOS / DDR CMOS / DDR LVDS - allows interface matching to FPGA I/O banks or ASIC receivers with voltage and timing flexibility. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN (UJ), exposed pad (Pin 41) soldered to PCB ground for thermal and electrical integrity. Operating temperature range: –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts 1–2VP-P differential signal; common-mode bias set by internal VCM (0.9V nominal) or external source. |
| ENC+, ENC– | Differential encode clock inputs | Trigger conversion on rising/falling edges; support PECL/LVDS/TTL/CMOS drive; optional duty cycle stabilizer improves timing margin. |
| VDD (Pins 9,10,40) | Analog power supply | 1.8V supply for core ADC and reference circuitry; requires local 0.1µF ceramic bypassing per pin group. |
| OVDD (Pin 26) | Digital output power supply | 1.2–1.9V selectable for CMOS outputs; sets output swing (1.2V–1.8V); 1.7–1.9V required for LVDS mode. |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO active); VDD = parallel control (CS/SCK/SDI repurposed for mode selection). |
| SENSE (Pin 39) | Reference and input range programming | Connect to VDD → ±1V range; ground → ±0.5V range; 0.625–1.3V external → ±0.8× applied voltage range. |
| VCM (Pin 37) | Common-mode bias output | Nominally VDD/2 (0.9V); used to bias AIN+/AIN–; requires 0.1µF bypass to GND for noise rejection. |
| REFH/REFL (Pins 4,5,6,7) | High/low reference terminals | Internal reference nodes; must be bypassed with 2.2µF + 0.1µF ceramics to suppress reference noise and ensure INL stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow jitter (0.17psRMS) | Enables clean undersampling of RF/IF signals up to 140MHz without significant aperture uncertainty degradation. |
| Configurable output interface | Full-rate CMOS, DDR CMOS, or DDR LVDS - eliminates need for external level shifters or serializers in FPGA-connected systems. |
| Integrated SPI port | Allows runtime reconfiguration of output format, randomizer, duty cycle stabilizer, and power modes without external logic. |
| Low-power Nap and Sleep modes | Reduces power to 9mW (Nap) or 0.5mW (Sleep) - critical for intermittent-sampling architectures like ultrasound beamforming or sensor hubs. |
| 800MHz analog input bandwidth | Supports direct digitization of wideband signals (e.g., MRI gradient waveforms, NDT pulses) without front-end gain/attenuation tuning. |
Applications
| Portable Medical Imaging | Multi-Channel Data Acquisition |
|---|---|
|
Use Scenario: Digitizing ultrasound echo return signals or MRI gradient feedback in handheld or cart-based diagnostic equipment. IC Role / Device Role / Timing Role: High-fidelity 14-bit sampling at 25Msps with 73.1dB SNR preserves weak tissue boundary reflections and harmonic content. Use Value: Enables compact, low-power systems meeting IEC 60601-1 leakage current limits while maintaining diagnostic image resolution. |
Use Scenario: Simultaneous sampling across 8–16 sensor channels (strain gauges, accelerometers, thermocouples) in industrial condition monitoring. IC Role / Device Role / Timing Role: Low 35mW dissipation and 800MHz bandwidth allow anti-alias filtering simplification and reduced thermal load in dense channel count designs. Use Value: Eliminates need for external decoupling networks per channel, lowering BOM cost and PCB area vs. lower-bandwidth alternatives. |
| Nondestructive Testing (NDT) | Software Defined Radios (SDR) |
|
Use Scenario: Capturing high-frequency pulsed echo responses from ultrasonic transducers inspecting weld integrity or composite materials. IC Role / Device Role / Timing Role: 88dB SFDR ensures detection of small flaw-induced harmonics amid strong fundamental returns; 0.17psRMS jitter preserves time-of-flight accuracy. Use Value: Reduces false call rate in automated defect classification algorithms by preserving signal fidelity across full 14-bit dynamic range. |
Use Scenario: Baseband or low-IF digitization in compact SDR platforms requiring flexible modulation schemes and spectrum agility. IC Role / Device Role / Timing Role: Configurable DDR LVDS outputs interface directly to Xilinx Zynq or Intel Cyclone FPGA transceivers at 50Mbps per lane. Use Value: Avoids external serializer/deserializer ICs, cutting latency and power while supporting real-time adaptive filtering in FPGA fabric. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2257IUJ-14 | 40Msps max sampling rate; 49mW power at 40Msps; identical pinout and feature set. | Required for higher-speed IF sampling (e.g., cellular base station monitoring) where 25Msps is insufficient. | Select when system clock budget allows >25Msps and SNR >73.2dB at 30MHz input is needed. |
| AD9246BCPZ-25 | 25Msps 14-bit ADC from Analog Devices; 74.5dB SNR; 1.8V supply; 48-pin LFCSP; no integrated duty cycle stabilizer or SENSE-programmable range. | Used in legacy designs with existing 48-pin footprint; lacks on-chip clock conditioning and flexible input scaling. | Choose if board layout already accommodates 48-pin package and external reference/biasing is preferred. |
Compared with LTC2257IUJ-14, the LTC2256IUJ-14 trades speed for lower power (35mW vs 49mW) and relaxed timing margins, while AD9246BCPZ-25 offers comparable speed but requires external circuitry for input range and clock optimization - making LTC2256IUJ-14 optimal for thermally constrained, feature-rich portable instrumentation.
Availability
LTC2256IUJ-14 is available at Aetrix Electronics and suitable for portable medical imaging, multi-channel data acquisition, nondestructive testing, and software defined radios requiring stable component supply across extended temperature ranges.
Supply support for LTC2256IUJ-14 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.
The LTC2256IUJ-14 belongs to the LTC225x family of ultralow-power, high-SFDR pipeline ADCs designed specifically for portable, battery-operated, and thermally sensitive instrumentation where dynamic range and power efficiency are co-critical.
FAQ
What is the maximum sampling rate supported by the LTC2256IUJ-14?
The LTC2256IUJ-14 is rated for a maximum sampling frequency of 25Msps, as confirmed in the "Timing Characteristics" table of its datasheet. This is a fixed specification for the -14 speed grade within the LTC225x family; higher rates (40Msps, 65Msps) apply only to the LTC2257IUJ-14 and LTC2258IUJ-14 variants respectively.
Does the LTC2256IUJ-14 support external voltage reference operation?
Yes, the LTC2256IUJ-14 supports external reference operation via the SENSE pin. Applying a voltage between 0.625V and 1.3V to SENSE selects an input range of ±0.8× that voltage, enabling precise scaling for custom sensor interfaces. Internal reference mode (1.25V ±25ppm/°C) is selected by tying SENSE to VDD or GND.
What digital output interface options does the LTC2256IUJ-14 provide?
The LTC2256IUJ-14 supports three configurable digital output modes: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Output voltage levels are set by OVDD (1.2–1.9V for CMOS; 1.7–1.9V for LVDS), and mode selection is controlled via PAR/SER pin state and SCK logic level in parallel programming mode.
How does the clock duty cycle stabilizer function in the LTC2256IUJ-14?
The clock duty cycle stabilizer in the LTC2256IUJ-14 is enabled by setting CS high in parallel programming mode. It corrects asymmetric encode clock duty cycles to maintain timing margin, allowing reliable operation even with clocks having 20%–80% duty cycle - critical for systems using crystal oscillators or PLLs without dedicated duty cycle correction.
What power-saving modes are available on the LTC2256IUJ-14?
The LTC2256IUJ-14 provides two low-power states: Nap mode (9mW) and Sleep mode (0.5mW). Nap mode retains register settings and reference bias while disabling the ADC core; Sleep mode powers down all analog circuitry except the bandgap reference. Both are entered via SDI pin control in parallel programming mode.
LTC2256IUJ-14 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 25M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- 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 FAQ
1.How can I place an order for LTC2256IUJ-14 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2256IUJ-14 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 reliable?
The price and inventory of LTC2256IUJ-14 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 is usually 5 days.
3.What payment methods are accepted for LTC2256IUJ-14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2256IUJ-14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2256IUJ-14?
LTC2256IUJ-14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2256IUJ-14 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?
For technical support, including LTC2256IUJ-14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2256IUJ-14 requirements.
6.How does Aetrix verify that LTC2256IUJ-14 is sourced from the original manufacturer or authorized distributors?
All LTC2256IUJ-14 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 meets industry standards.
7.What is the process for return or replacement of LTC2256IUJ-14?
All LTC2256IUJ-14 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2256IUJ-14, 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 part is unused and in its original packaging.
Return procedure for LTC2256IUJ-14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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