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Analog Devices Inc. LTC2256IUJ-14#PBF
- Part No.:
- LTC2256IUJ-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2256IUJ-14#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:126
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Product details
Overview
LTC2256IUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 25Msps ultralow-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation systems. It delivers 73dB SNR, 88dB SFDR, and 0.17psRMS jitter at 1.8V supply, enabling undersampling of IF signals up to 140MHz in portable medical imaging and multi-channel data acquisition.
For engineers reviewing the LTC2256IUJ-14#PBF datasheet, LTC2256IUJ-14#PBF pinout, LTC2256IUJ-14#PBF application, or LTC2256IUJ-14#PBF equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases, and validated alternative options for design-in and sourcing decisions.
Technical Context
The LTC2256IUJ-14#PBF implements a 14-bit pipelined ADC architecture with integrated sample-and-hold (800MHz full-power bandwidth), internal/external reference selection via SENSE pin, and configurable digital output modes - full-rate CMOS, DDR CMOS, or DDR LVDS. Its serial SPI port enables runtime configuration of clock duty cycle stabilizer, data randomizer, and power modes (Nap/Sleep).
It supports differential or single-ended encode inputs (ENC+/ENC–), selectable input ranges (1VP-P to 2VP-P), and operates across –40°C to +85°C. The device uses a 40-pin 6mm × 6mm QFN package with exposed thermal pad (Pin 41 = GND), requiring soldering to PCB for thermal and electrical integrity.
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 - fixed maximum sampling frequency for the LTC2256-14 variant, defining real-time bandwidth for baseband and low-IF applications. |
| SNR / SFDR | 73dB SNR and 88dB SFDR at 70MHz input - enables high-fidelity digitization of narrowband RF signals in software-defined radios and NDT equipment. |
| Power Dissipation | 35mW at 25Msps (LVDS mode, 1.75mA) - ultra-low power enables battery-operated portable medical imaging and handheld test instruments. |
| Analog Input BW | 800MHz full-power bandwidth - supports direct sampling of wideband IF signals without external amplification or filtering. |
| Jitter | 0.17psRMS aperture jitter - minimizes noise floor degradation during undersampling of 100+ MHz IFs in cellular base station receivers. |
| Supply Voltage | Single 1.8V analog (VDD) and flexible 1.2V–1.9V output (OVDD) supplies - simplifies power rail design and enables interface compatibility with 1.2V/1.8V logic families. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN (UJ), exposed pad (Pin 41) tied to GND and required to be soldered to PCB for thermal management and ground integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– (1, 2) | Differential analog input pair | Accepts ±0.5V to ±1V input range (configurable via SENSE); common-mode voltage set by VCM (Pin 37) at ~0.9V. |
| ENC+, ENC– (11, 12) | Differential encode clock inputs | Trigger conversion on rising/falling edges; support PECL/LVDS/TTL/CMOS drive; enable duty cycle stabilization when CS = high. |
| PAR/SER (8) | Programming mode select | Ground = serial SPI mode (CS/SCK/SDI/SDO active); VDD = parallel mode (CS/SCK/SDI repurposed for control functions). |
| VDD (9, 10, 40) | Analog supply | 1.8V ±0.1V supply; each pin requires local 0.1µF ceramic bypass to GND for noise suppression. |
| OVDD (26) | Digital output supply | Configurable 1.2V–1.9V supply sets CMOS output swing or enables LVDS current mode (1.75mA/3.5mA). |
| SENSE (39) | Reference programming input | Determines input range: VDD → ±1V, GND → ±0.5V, external 0.625–1.3V → ±0.8× applied voltage. |
| VCM (37) | Common-mode bias output | Nominally VDD/2 (0.9V); used to bias AIN+/AIN– common-mode; requires 0.1µF bypass to GND. |
| REFH/REFL (4–7) | Internal reference terminals | High/low reference nodes; require 2.2µF + 0.1µF ceramic bypass network between REFH–REFL and to GND. |
| OGND (25) | Digital output ground | Separate ground return for output drivers; must be connected to system ground near OVDD bypass capacitor. |
| Exposed Pad (41) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane for thermal dissipation (θJA = 32°C/W) and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power operation | 35mW at 25Msps (LVDS mode) - reduces thermal load and extends battery life in portable diagnostic and field-deployable test gear. |
| Configurable digital outputs | Full-rate CMOS, DDR CMOS, or DDR LVDS - allows interface matching to FPGA I/O banks (1.2V/1.8V) or high-speed SerDes links without level shifters. |
| Optional clock duty cycle stabilizer | Enables high-performance sampling with non-50% clock duty cycles - eliminates need for external clock conditioning circuitry in legacy timing systems. |
| Data output randomizer | Reduces deterministic spectral spurs caused by periodic digital switching - improves SFDR in narrowband receiver front-ends. |
| Serial SPI configuration port | Allows dynamic reconfiguration of power modes, output formats, and features - supports adaptive power management in software-defined platforms. |
| Pin-compatible family | Shares identical 40-pin QFN footprint with LTC2257-14 (40Msps) and LTC2258-14 (65Msps) - enables scalable sampling rate upgrades without PCB redesign. |
Applications
| Portable Medical Ultrasound | Multi-Channel Data Acquisition |
|---|---|
|
Use Scenario: Digitizing echo signals from phased-array transducers in handheld ultrasound units with strict size and thermal constraints. IC Role / Device Role: High-fidelity 14-bit ADC capturing 20–40MHz IF signals after mixer downconversion, operating at 25Msps with minimal power draw. Use Value: 73dB SNR preserves weak tissue echoes; 35mW dissipation avoids heat buildup in sealed enclosures; 6mm × 6mm QFN fits compact probe electronics. |
Use Scenario: Simultaneous sampling across 8–16 sensor channels in industrial condition monitoring systems with isolated analog front-ends. IC Role / Device Role: Precision ADC per channel or time-multiplexed shared converter, leveraging low INL (±1LSB) and stable gain error (±1.5%FS) for calibrated measurements. Use Value: No missing codes ensures accurate peak detection; 800MHz input bandwidth accommodates anti-aliasing filter roll-off; SPI configurability supports channel-specific settings. |
| Nondestructive Testing (NDT) | Software Defined Radio (SDR) Receivers |
|
Use Scenario: Capturing high-frequency pulsed echo returns from ultrasonic flaw detectors used in aerospace component inspection. IC Role / Device Role: Digitizing 50–150MHz transient signals with high dynamic range to resolve micro-cracks and material interfaces. Use Value: 88dB SFDR suppresses harmonic distortion masking small defects; 0.17psRMS jitter maintains time-of-flight resolution; –40°C to +85°C rating suits field environments. |
Use Scenario: Direct IF sampling in wideband SDR receivers covering 10–100MHz bands, where flexibility and low power are critical for embedded deployment. IC Role / Device Role: ADC core in FPGA-based receiver chain, configured via SPI for Nap mode during idle periods and DDR LVDS output to reduce EMI. Use Value: Pin compatibility with LTC2257-14/LTC2258-14 allows hardware reuse across bandwidth tiers; randomizer feature lowers spurious emissions in spectrum-constrained deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2257IUJ-14#PBF | 40Msps max sampling rate; same 14-bit resolution, 73dB SNR, and 40-pin QFN package; 49mW power at 40Msps. | Higher throughput for wider instantaneous bandwidth requirements (e.g., 20MHz+ IF capture in LTE receivers). | Select when system demands >25Msps while retaining identical layout, reference design, and SPI register map. |
| AD9249BCPZ-65 | 14-bit, 65Msps; JESD204B serial output (not parallel); higher power (525mW); 72dB SNR at 70MHz; 64-pin LFCSP. | Targets high-channel-count systems using FPGA JESD204B receivers; not pin-compatible and requires serializer/deserializer infrastructure. | Choose for dense multi-ADC arrays where serial interconnect reduces routing complexity, accepting higher power and different packaging. |
Compared with LTC2257IUJ-14#PBF and AD9249BCPZ-65, the LTC2256IUJ-14#PBF offers the lowest power and smallest footprint for 25Msps-class precision digitization, making it optimal for space- and energy-constrained edge sensing nodes where parallel CMOS/LVDS interfacing is preferred.
Availability
LTC2256IUJ-14#PBF is available at Aetrix Electronics and suitable for portable medical imaging, multi-channel data acquisition, nondestructive testing, and software-defined radio receivers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2256IUJ-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2256-14 belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications and instrumentation applications requiring ultralow power, excellent dynamic performance, and robust operation across extended temperature ranges.
FAQ
What is the maximum sampling rate supported by the LTC2256IUJ-14#PBF?
The LTC2256IUJ-14#PBF is rated for a maximum sampling rate of 25Msps, as specified in its part number suffix "-14" and confirmed in the Absolute Maximum Ratings and Timing Characteristics tables. This distinguishes it from the pin-compatible LTC2257-14 (40Msps) and LTC2258-14 (65Msps) variants in the same family.
Does the LTC2256IUJ-14#PBF support both internal and external voltage references?
Yes, the LTC2256IUJ-14#PBF supports both internal and external references. The SENSE pin (Pin 39) configures the reference source: tied to VDD selects the internal 1.25V reference with ±1V input range; tied to GND selects ±0.5V; applying 0.625V–1.3V externally sets a proportional ±0.8× input range. Internal reference drift is ±25ppm/°C.
What digital output interface options does the LTC2256IUJ-14#PBF provide?
The LTC2256IUJ-14#PBF offers three configurable digital output modes: full-rate CMOS (14 single-ended outputs), double-data-rate CMOS (7 pairs), or double-data-rate LVDS (7 differential pairs). Output voltage swing is set by OVDD (1.2V–1.9V for CMOS) or current mode (1.75mA/3.5mA for LVDS), with on-chip 100Ω LVDS termination enabled when OVDD = 1.8V.
How is the LTC2256IUJ-14#PBF programmed and configured?
The LTC2256IUJ-14#PBF is configured via a 4-wire SPI interface (CS, SCK, SDI, SDO) when PAR/SER (Pin 8) is grounded. This allows read/write access to internal mode registers controlling clock duty cycle stabilizer, data randomizer, Nap/Sleep modes, and output format. In parallel mode (PAR/SER = VDD), only basic functions are accessible via CS/SCK/SDI logic levels.
What is the operating temperature range for the LTC2256IUJ-14#PBF?
The LTC2256IUJ-14#PBF is rated for an industrial operating temperature range of –40°C to +85°C, indicated by the "I" grade in the part number. This is verified across all key specifications including SNR, SFDR, INL, DNL, and power consumption, ensuring reliable performance in harsh environmental conditions.
LTC2256IUJ-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):
- 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#PBF FAQ
1.How can I place an order for LTC2256IUJ-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2256IUJ-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 LTC2256IUJ-14#PBF reliable?
The price and inventory of LTC2256IUJ-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 LTC2256IUJ-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2256IUJ-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2256IUJ-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2256IUJ-14#PBF?
LTC2256IUJ-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2256IUJ-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 LTC2256IUJ-14#PBF?
For technical support, including LTC2256IUJ-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2256IUJ-14#PBF requirements.
6.How does Aetrix verify that LTC2256IUJ-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2256IUJ-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 LTC2256IUJ-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2256IUJ-14#PBF?
All LTC2256IUJ-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2256IUJ-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 LTC2256IUJ-14#PBF part is unused and in its original packaging.
Return procedure for LTC2256IUJ-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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