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Analog Devices Inc. LTC2256CUJ-12#TRPBF
- Part No.:
- LTC2256CUJ-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2256CUJ-12#TRPBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,027
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Product details
Overview
LTC2256CUJ-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 25Msps ultralow-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and portable instrumentation. It delivers 70.5dB SNR, 84dB SFDR, and 0.17psRMS jitter at 1.8V supply, supporting differential analog inputs up to 2VP-P with 800MHz full-power bandwidth - ideal for undersampling IF signals in software-defined radios and portable medical imaging.
For engineers reviewing the LTC2256CUJ-12#TRPBF datasheet, LTC2256CUJ-12#TRPBF pinout, LTC2256CUJ-12#TRPBF application, or LTC2256CUJ-12#TRPBF equivalent, this page provides verified technical context, package mapping, output mode configuration options (CMOS/LVDS), SPI programmability, and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The LTC2256CUJ-12#TRPBF implements a pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable digital outputs. Its 0.17psRMS aperture jitter enables high-fidelity undersampling of RF/IF signals up to 140MHz while maintaining 70.5dB SNR at –1dBFS input.
It supports three digital output configurations: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS - each with independent power supplies (VDD = 1.8V, OVDD = 1.2V–1.9V). The ENC+/ENC– differential clock interface accepts sine, PECL, LVDS, TTL, or CMOS inputs, and includes an optional duty cycle stabilizer for robust timing across non-50% clock waveforms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, no missing codes over temperature - guarantees monotonicity and full code coverage in precision measurement systems. |
| Sampling Rate | 25Msps - fixed maximum rate for this variant; enables real-time baseband digitization in multi-channel data acquisition. |
| SNR | 70.5dB at 70MHz input, –1dBFS - defines usable dynamic range for detecting low-level signals amid noise floor. |
| SFDR | 84dB at 70MHz input - determines spurious-free resolution for spectral purity-critical applications like cellular base stations. |
| Power Dissipation | 34mW at 25Msps, sine input, OVDD = 1.2V - enables battery-powered operation in portable medical imaging and handheld test equipment. |
| Input Bandwidth | 800MHz full-power bandwidth - supports direct sampling of wideband IF signals without external amplification or filtering. |
| Jitter | 0.17psRMS aperture jitter - limits sampling uncertainty, enabling clean undersampling of 100+ MHz carriers. |
Pinout & Package
40-lead (6mm × 6mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41 = GND). Requires soldering of exposed pad to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts 1–2VP-P differential signal; common-mode bias set by VCM (Pin 37); supports DC-coupled or AC-coupled front-ends. |
| ENC+, ENC– | Differential encode clock inputs | Trigger conversion on rising/falling edges; support 1.8V–3.3V logic families; enable duty cycle stabilization when CS = high. |
| VDD (Pins 9,10,40) | Analog supply | 1.8V ±0.1V; requires local 0.1µF ceramic bypass per pin; powers core ADC and reference circuitry. |
| OVDD (Pin 26) | Digital output supply | Configurable 1.2V–1.9V; sets CMOS output swing or LVDS current mode (1.75mA/3.5mA); decoupled with 0.1µF capacitor. |
| D0–D11 | Data outputs | In full-rate CMOS mode: 12 single-ended outputs (D11 = MSB); in DDR modes: time-multiplexed pairs (e.g., D0_1, D10_11) with CLKOUT± timing reference. |
| CLKOUT+, CLKOUT– | Output clock pair | LVDS or CMOS-compliant clock synchronized to data; used for latch timing in FPGA/ASIC receivers; phase adjustable via SPI. |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO active); VDD = parallel control (CS/SCK/SDI repurposed for functional mode selection). |
| SENSE (Pin 39) | Reference programming | Set input range: VDD → ±1V; GND → ±0.5V; external 0.625–1.3V → ±0.8×VSENSE - enables flexible sensor interface scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 25Msps | 34mW total dissipation - reduces thermal load and extends battery life in portable diagnostic devices. |
| Selectable output interface | Full-rate CMOS, DDR CMOS, or DDR LVDS - allows optimization for FPGA I/O voltage, EMI constraints, or trace length in dense PCB layouts. |
| Integrated clock duty cycle stabilizer | Enables high-performance sampling with non-ideal clocks (e.g., from PLLs or crystal oscillators with >30% duty variation) - eliminates need for external clock conditioning. |
| Serial SPI configuration port | Enables runtime reconfiguration of output mode, randomizer, nap/sleep states, and CLKOUT phase - supports adaptive system calibration and power management. |
| 800MHz analog input bandwidth | Supports direct IF sampling up to 140MHz without external amplifiers - simplifies front-end design and improves SNR by avoiding gain-stage noise. |
Applications
| Software Defined Radio (SDR) | Portable Ultrasound Imaging |
|---|---|
Use Scenario: Digitizing 70–100MHz IF signals from RF downconverters in compact SDR transceivers. IC Role / Device Role / Timing Role: High-speed ADC capturing wide instantaneous bandwidth with minimal quantization noise and spurs. Use Value: 70.5dB SNR and 84dB SFDR ensure accurate demodulation of QAM-64/256 signals; 25Msps rate matches baseband processing requirements while minimizing FPGA resource usage. | Use Scenario: Acquiring echo return signals from piezoelectric transducers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, low-power ADC interfacing directly to analog beamformer outputs. Use Value: 34mW power enables multi-channel integration within thermal limits; 800MHz bandwidth preserves pulse fidelity for sub-mm spatial resolution. |
| Multi-Channel Data Acquisition | Nondestructive Testing (NDT) |
Use Scenario: Simultaneous sampling across 8–16 channels in industrial vibration monitoring systems. IC Role / Device Role / Timing Role: Precision ADC providing synchronized, calibrated digitization with minimal inter-channel skew. Use Value: ±0.3LSB INL and ±0.1LSB DNL ensure amplitude accuracy across channels; SPI programmability allows per-channel gain/offset calibration. | Use Scenario: Capturing high-frequency acoustic emissions from weld inspections or composite material stress testing. IC Role / Device Role / Timing Role: Wideband ADC resolving transient pulses with nanosecond timing resolution. Use Value: 0.17psRMS jitter enables precise time-of-flight measurements; 12-bit resolution captures subtle amplitude variations indicating micro-cracks or delamination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9226ASTZ-RL7 | 12-bit, 65Msps; higher speed but 100mW power; no integrated duty cycle stabilizer or SPI configuration. | Better suited for fixed high-throughput systems where clock conditioning is handled externally and power is not constrained. | Select when sampling rate >25Msps is required and board space permits external clock cleanup circuitry. |
| LTC2255CUJ-12#TRPBF | 12-bit, 40Msps; 47mW power; identical pinout and feature set except for max sample rate and corresponding power/performance trade-off. | Drop-in upgrade path for designs needing higher throughput without layout change - same footprint, register map, and timing behavior. | Choose when system bandwidth increases to 40Msps and existing PCB layout must be preserved. |
Compared with AD9226ASTZ-RL7 and LTC2255CUJ-12#TRPBF, the LTC2256CUJ-12#TRPBF offers the lowest power at its rated speed and unique on-chip clock stabilization - making it optimal for thermally constrained, field-deployable instrumentation where clock source quality is variable.
Availability
LTC2256CUJ-12#TRPBF is available at Aetrix Electronics and suitable for software-defined radio development, portable medical imaging platforms, and multi-channel industrial data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC2256CUJ-12#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 technologies for precision signal processing.
The LTC225x family was designed specifically for demanding communications and instrumentation applications requiring ultralow power, high SNR, and flexible digital interfacing - targeting SDR, medical imaging, and test equipment where thermal, size, and spectral purity constraints dominate.
FAQ
What is the maximum sampling rate supported by the LTC2256CUJ-12#TRPBF?
The LTC2256CUJ-12#TRPBF is rated for a maximum sampling rate of 25Msps. This is a fixed specification for this variant - distinct from the LTC2257-12 (40Msps) and LTC2258-12 (65Msps) in the same family. Operating beyond 25Msps is not guaranteed and may degrade SNR, SFDR, and linearity performance per the datasheet's absolute maximum ratings and AC specifications table.
Does the LTC2256CUJ-12#TRPBF support both internal and external voltage references?
Yes, the LTC2256CUJ-12#TRPBF supports both internal and external references via the SENSE pin (Pin 39). Connecting SENSE to VDD selects the internal 1.25V reference with ±1V input range; connecting to GND selects ±0.5V range; applying 0.625V–1.3V externally sets ±0.8×VSENSE range. Internal reference drift is ±25ppm/°C; external reference performance depends on the applied source's stability and noise.
Can the LTC2256CUJ-12#TRPBF operate with a 1.2V digital output supply (OVDD)?
Yes, the LTC2256CUJ-12#TRPBF supports OVDD from 1.1V to 1.9V in CMOS output modes. At OVDD = 1.2V, CMOS outputs deliver VOH ≥1.185V and VOL ≤0.010V under 500µA load - compatible with 1.2V FPGA I/O banks. LVDS mode requires OVDD ≥1.7V and is incompatible with 1.2V operation.
What is the purpose of the PAR/SER pin on the LTC2256CUJ-12#TRPBF?
The PAR/SER pin (Pin 8) configures the device's control interface: grounded for serial SPI mode (CS/SCK/SDI/SDO active), or tied to VDD for parallel mode (CS/SCK/SDI repurposed for functional control). In serial mode, all features - including output format, randomizer, nap mode, and CLKOUT phase - are fully programmable; parallel mode offers simplified hardware control with reduced feature access.
Is the LTC2256CUJ-12#TRPBF pin-compatible with other members of the LTC225x-12 family?
Yes, the LTC2256CUJ-12#TRPBF shares identical 40-pin QFN (UJ) packaging, pinout, and register map with LTC2257CUJ-12#TRPBF and LTC2258CUJ-12#TRPBF. This enables drop-in replacement across the 25/40/65Msps variants - allowing design reuse, simplified inventory, and scalable performance upgrades without PCB revision.
LTC2256CUJ-12#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:
- 12
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 40-QFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2256CUJ-12#TRPBF FAQ
1.How can I place an order for LTC2256CUJ-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2256CUJ-12#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 LTC2256CUJ-12#TRPBF reliable?
The price and inventory of LTC2256CUJ-12#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2256CUJ-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2256CUJ-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2256CUJ-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2256CUJ-12#TRPBF?
LTC2256CUJ-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2256CUJ-12#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 LTC2256CUJ-12#TRPBF?
For technical support, including LTC2256CUJ-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2256CUJ-12#TRPBF requirements.
6.How does Aetrix verify that LTC2256CUJ-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2256CUJ-12#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 LTC2256CUJ-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2256CUJ-12#TRPBF?
All LTC2256CUJ-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2256CUJ-12#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 LTC2256CUJ-12#TRPBF part is unused and in its original packaging.
Return procedure for LTC2256CUJ-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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