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Analog Devices Inc. LTC2256CUJ-12#PBF
- Part No.:
- LTC2256CUJ-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2256CUJ-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
LTC2256CUJ-12#PBF 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 25Msps, operating from a single 1.8V supply with CMOS, DDR CMOS, or DDR LVDS outputs - ideal for multi-channel data acquisition systems requiring low thermal footprint.
For engineers reviewing the LTC2256CUJ-12#PBF datasheet, LTC2256CUJ-12#PBF pinout, LTC2256CUJ-12#PBF application, or LTC2256CUJ-12#PBF equivalent, this page provides verified specifications, validated QFN-40 pin functions, real-world use cases in portable medical imaging and nondestructive testing, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LTC2256CUJ-12#PBF implements a pipelined ADC architecture with integrated sample-and-hold (800MHz full-power bandwidth), on-chip 1.25V reference, and configurable input range (1–2VP-P). Its digital interface supports serial SPI configuration and three output modes - full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS - each with programmable clock duty cycle stabilization and optional data randomization.
It features dual power domains (VDD = 1.8V analog, OVDD = 1.2–1.9V output), shutdown/nap modes (0.5mW / 9mW), and differential or single-ended ENC+/- clocking. DC accuracy includes ±0.3LSB INL and ±0.1LSB DNL over temperature, with no missing codes guaranteed.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit, no missing codes - ensures monotonicity and full code coverage across temperature. |
| Sampling Rate | 25Msps - fixed maximum rate for LTC2256-12 variant; enables baseband and IF sampling up to ~12.5MHz Nyquist. |
| SNR / SFDR | 70.5dB / 84dB at 70MHz input - defines usable dynamic range for demanding RF and ultrasound applications. |
| Power Dissipation | 34mW at 25Msps (sine input, OVDD=1.2V) - enables battery-powered portable designs with minimal thermal management. |
| Analog Supply | Single 1.8V (1.7–1.9V) - simplifies power delivery and reduces BOM count versus dual-supply ADCs. |
| Input Bandwidth | 800MHz full-power - supports undersampling of IF signals up to cellular and SDR bands without external amplification. |
| Jitter Performance | 0.17psRMS aperture jitter - limits SNR degradation at high input frequencies, critical for wideband digitization. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN (UJ package) with exposed pad (Pin 41 = GND), RoHS-compliant, 0°C to 70°C operating range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts 1–2VP-P signal; common-mode bias set by VCM (Pin 37); supports AC- or DC-coupled inputs. |
| ENC+, ENC– | Differential encode clock inputs | Trigger conversion on rising/falling edges; support PECL/LVDS/TTL/CMOS; duty cycle stabilizer enabled via CS. |
| VDD (Pins 9,10,40) | Analog power supply | 1.8V ±0.1V; requires local 0.1µF ceramic bypass per pin; shared ground with GND (Pin 3). |
| OVDD (Pin 26) | Digital output supply | Configurable 1.2–1.9V; sets CMOS output swing or enables LVDS termination; bypassed to OGND (Pin 25). |
| D0–D11 (Pins 19–24,29–34) | Parallel digital data outputs | 12-bit MSB-aligned; output format depends on SCK state and PAR/SER setting; DDR modes multiplex pairs (e.g., D0_1). |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI control (CS/SCK/SDI/SDO active); VDD = parallel logic control (CS/SCK/SDI repurposed). |
| SENSE (Pin 39) | Reference programming input | Determines input range: tied to VDD → ±1V; grounded → ±0.5V; 0.625–1.3V external → ±0.8×VSENSE. |
| CLKOUT+, CLKOUT– | Data output clock (LVDS) | DDR LVDS mode only; provides edge-aligned timing for sampled data; phase adjustable via SPI register. |
| OF (Pin 36) | Over/underflow flag | Active-high pulse indicates saturation beyond ±FS/2; used for AGC or clipping detection in real-time systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 25Msps | 34mW total dissipation - enables dense channel count in portable ultrasound or phased-array sensors without forced cooling. |
| Selectable output interface | Full-rate CMOS, DDR CMOS, or DDR LVDS - allows optimization for PCB routing density (CMOS) or noise immunity (LVDS). |
| On-chip reference & bias | 1.25V VREF (±25ppm/°C) and VCM = VDD/2 (±25mV) - eliminates external reference ICs and reduces layout sensitivity. |
| Flexible clocking | Differential or single-ended ENC inputs with duty cycle stabilizer - tolerates asymmetric clocks from FPGA PLLs or crystal oscillators. |
| Low-latency pipeline | 5.5-cycle latency in DDR modes - supports deterministic real-time processing in closed-loop control or beamforming. |
Applications
| Portable Medical Imaging | Nondestructive Testing |
|---|---|
Use Scenario: Handheld ultrasound probe digitizing echo return signals from tissue interfaces at 20–40MHz center frequency. IC Role / Device Role / Timing Role: Primary ADC capturing RF envelope data; synchronized to pulsed transmit clock via ENC+/ENC–; uses DDR LVDS for noise-immune transmission to FPGA. Use Value: 800MHz input bandwidth enables direct RF sampling without downconversion; 70.5dB SNR preserves contrast resolution in B-mode imaging. | Use Scenario: Ultrasonic flaw detector analyzing material integrity in aerospace composites using pulsed echo time-of-flight analysis. IC Role / Device Role / Timing Role: High-fidelity digitizer for wideband transducer signals; configured in full-rate CMOS mode for low-latency FPGA interfacing. Use Value: 0.17psRMS jitter minimizes time-domain uncertainty in TOF measurements; ±0.3LSB INL ensures accurate amplitude calibration across gain stages. |
| Multi-Channel Data Acquisition | Software Defined Radios |
Use Scenario: 16-channel vibration monitoring system for industrial predictive maintenance, sampling accelerometers at 25ksps per channel. IC Role / Device Role / Timing Role: One LTC2256CUJ-12#PBF per channel; daisy-chained SPI for global configuration; powered-down between samples to reduce average power. Use Value: 9mW nap mode cuts idle power by >99% vs active; 34mW active power allows 16-channel board to stay under 600mW thermal budget. | Use Scenario: Low-SWaP SDR front-end receiving LTE/WiFi signals in the 2.4GHz ISM band via harmonic sampling. IC Role / Device Role / Timing Role: Undersampling ADC accepting 2nd/3rd harmonic of IF; driven by ultra-low-jitter clock; outputs routed via DDR LVDS to baseband processor. Use Value: 84dB SFDR suppresses harmonics and spurs during harmonic sampling; 1.8V single supply simplifies PMIC design in compact modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS5272IPFP | 12-bit, 40Msps; 72dB SNR; 1.8V/3.3V dual supply; LVDS-only outputs; no internal reference. | Higher speed but requires external reference and level-shifting; better suited for wired infrastructure than portable battery operation. | Choose ADS5272IPFP when higher sample rate and LVDS robustness outweigh power and integration trade-offs. |
| LTC2255CUJ-12#PBF | 12-bit, 10Msps; 70.5dB SNR; identical pinout, package, and feature set except lower max sample rate and 22mW power. | Drop-in replacement for lower-bandwidth applications where reduced thermal load and cost are priorities. | Choose LTC2255CUJ-12#PBF when system bandwidth ≤10MHz and lowest possible power (<22mW) is required. |
Compared with ADS5272IPFP and LTC2255CUJ-12#PBF, the LTC2256CUJ-12#PBF uniquely balances 25Msps throughput, 34mW power, integrated reference, and triple-output flexibility - making it optimal for portable, multi-channel, and thermally constrained digitization tasks.
Availability
LTC2256CUJ-12#PBF is available at Aetrix Electronics and suitable for portable medical imaging, nondestructive testing, multi-channel data acquisition, and software defined radios requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2256CUJ-12#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 LTC2256CUJ-12#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for low-power, high-dynamic-range digitization in portable and thermally constrained systems - emphasizing integration, jitter performance, and flexible I/O.
FAQ
What is the maximum sampling rate supported by the LTC2256CUJ-12#PBF?
The LTC2256CUJ-12#PBF is rated for a maximum sampling rate of 25Msps, as specified in its part number suffix "-12" and confirmed in the Absolute Maximum Ratings and Timing Characteristics tables. This is the fixed top speed for the LTC2256-12 family variant; higher rates (40/65Msps) apply only to the LTC2257-12 and LTC2258-12 respectively. Operation above 25Msps is not guaranteed and may violate timing margins or degrade AC performance.
Does the LTC2256CUJ-12#PBF include an internal voltage reference?
Yes, the LTC2256CUJ-12#PBF integrates a precision 1.25V internal reference (VREF, Pin 38) with ±25ppm/°C drift and 7Ω output impedance. It also provides a VCM output (Pin 37) nominally at VDD/2 for analog input biasing. The SENSE pin (Pin 39) configures input range selection: tied to VDD yields ±1V, grounded yields ±0.5V, and external 0.625–1.3V sets ±0.8×VSENSE.
Can the LTC2256CUJ-12#PBF operate with a 1.2V digital output supply (OVDD)?
Yes, the LTC2256CUJ-12#PBF supports OVDD from 1.1V to 1.9V. At OVDD = 1.2V, CMOS outputs deliver VOH ≥1.185V and VOL ≤0.010V under 500µA load, enabling direct interfacing with 1.2V FPGA I/O banks. LVDS mode requires OVDD ≥1.7V and is incompatible with 1.2V operation.
What is the function of the PAR/SER pin on the LTC2256CUJ-12#PBF?
The PAR/SER pin (Pin 8) selects the programming interface mode: grounded enables serial SPI control (CS/SCK/SDI/SDO active), while tied to VDD enables parallel logic control (CS, SCK, SDI repurposed for duty cycle stabilizer, output mode, and sleep control). It must be hard-wired to GND or VDD - not driven dynamically - and determines register accessibility and pin functionality.
Is the LTC2256CUJ-12#PBF pin-compatible with other members of the LTC225x-12 family?
Yes, the LTC2256CUJ-12#PBF shares identical 40-pin QFN (UJ) packaging, pinout, and footprint with the LTC2257CUJ-12#PBF and LTC2258CUJ-12#PBF. All three support the same power, reference, clock, and output configurations - enabling hardware reuse across 10/25/40/65Msps variants via firmware or configuration changes.
LTC2256CUJ-12#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:
- 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#PBF FAQ
1.How can I place an order for LTC2256CUJ-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2256CUJ-12#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 LTC2256CUJ-12#PBF reliable?
The price and inventory of LTC2256CUJ-12#PBF 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#PBF is usually 5 days.
3.What payment methods are accepted for LTC2256CUJ-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2256CUJ-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2256CUJ-12#PBF?
LTC2256CUJ-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2256CUJ-12#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 LTC2256CUJ-12#PBF?
For technical support, including LTC2256CUJ-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2256CUJ-12#PBF requirements.
6.How does Aetrix verify that LTC2256CUJ-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2256CUJ-12#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 LTC2256CUJ-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2256CUJ-12#PBF?
All LTC2256CUJ-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2256CUJ-12#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 LTC2256CUJ-12#PBF part is unused and in its original packaging.
Return procedure for LTC2256CUJ-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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