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Analog Devices Inc. LTC2257IUJ-14#PBF
- Part No.:
- LTC2257IUJ-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2257IUJ-14#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:227
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Product details
Overview
LTC2257IUJ-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 40Msps ultralow-power pipelined analog-to-digital converter with 74dB SNR and 88dB SFDR, designed for high-frequency signal digitization in communications infrastructure. It operates from a single 1.8V supply, supports CMOS/DDR-CMOS/DDR-LVDS outputs, and features 800MHz full-power bandwidth, optional clock duty cycle stabilizer, and SPI configuration - deployed in cellular base stations and portable medical imaging systems.
For engineers reviewing the LTC2257IUJ-14#PBF datasheet, LTC2257IUJ-14#PBF pinout, LTC2257IUJ-14#PBF application, or LTC2257IUJ-14#PBF equivalent, key selection criteria include its 40Msps sampling rate, –40°C to +85°C industrial temperature grade, 1.8V single-supply operation, and compatibility with differential sine wave, LVDS, or PECL encode clocks - critical for undersampling IF signals in SDR and test equipment.
Technical Context
The LTC2257IUJ-14#PBF implements a 14-bit pipelined ADC architecture optimized for wide dynamic range and low jitter (0.17psRMS), enabling high-fidelity undersampling of IF frequencies up to 140MHz. Its sample-and-hold stage delivers 800MHz full-power bandwidth and ±1LSB INL (typ), while internal correction logic ensures no missing codes over temperature.
Digital interface flexibility includes full-rate CMOS, DDR-CMOS, or DDR-LVDS output modes, with separate OVDD supply (1.2V–1.9V) enabling output swing control. Configuration is handled via SPI port (CS/SCK/SDI/SDO) or parallel mode using PAR/SER pin, supporting shutdown, nap, and data randomizer functions for system-level noise management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit, guaranteed no missing codes - ensures monotonicity and precision across full operating range |
| Sampling Rate | 40Msps - matches mid-tier SDR and multi-channel DAQ timing requirements without oversampling penalty |
| SNR / SFDR | 74dB / 88dB at 30MHz input - enables clean digitization of narrowband RF carriers in crowded spectrum |
| Power Dissipation | 49mW at 40Msps (CMOS mode, 1.8V) - reduces thermal load in dense PCB layouts and battery-constrained portable systems |
| Analog Input Range | Selectable 1VP-P to 2VP-P - simplifies front-end gain staging for varying sensor or mixer output levels |
| Full-Power Bandwidth | 800MHz - supports direct sampling of L-band and lower S-band signals without external track-and-hold |
| Jitter Performance | 0.17psRMS aperture jitter - preserves ENOB when undersampling 70MHz+ IF signals |
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 reconfigure per CMOS/LVDS and full-rate/DDR modes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– (1, 2) | Differential analog input pair | Accepts 1–2VP-P input with common-mode bias set by VCM; supports DC-coupled or AC-coupled signal paths |
| ENC+, ENC– (11, 12) | Differential encode clock inputs | Trigger conversion on rising/falling edges; compatible with sine, LVDS, PECL, TTL, or CMOS sources |
| PAR/SER (8) | Programming mode select | Ground = serial SPI mode; VDD = parallel control mode - determines function of CS/SCK/SDI pins |
| VDD (9, 10, 40) | Analog power supply | 1.7–1.9V nominal; requires local 0.1µF ceramic bypassing per pin for noise-sensitive analog core |
| OVDD (26) | Digital output supply | 1.1–1.9V; sets CMOS output swing or enables LVDS current mode (1.75mA/3.5mA) |
| VCM (37) | Common-mode reference output | Nominally VDD/2 (±25mV); used to bias AIN+/AIN– for optimal differential linearity |
| SENSE (39) | Reference programming input | Selects internal reference range (±0.5V/±1V) or accepts external 0.625–1.3V reference for custom scaling |
| CS, SCK, SDI, SDO (13–16) | SPI configuration interface | Serial mode: full register access; parallel mode: limited control (clock stabilizer, sleep, output format) |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 40Msps | 49mW total dissipation - enables thermal-aware placement near FPGAs or SoCs in compact radio modules |
| Optional clock duty cycle stabilizer | Enables high-performance sampling with non-50% duty cycle clocks - eliminates need for external clock conditioning circuitry |
| Configurable digital outputs | CMOS/DDR-CMOS/DDR-LVDS selectable via PAR/SER and SCK - adapts to FPGA I/O standards without level-shifting |
| Integrated SPI interface | Full register read/write capability - allows runtime adjustment of randomizer, nap mode, and output formatting |
| Industrial temperature grade | –40°C to +85°C operation - qualified for base station remote radio units and field-deployable diagnostic equipment |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing 70MHz IF signals from up/downconverters in macrocell and small cell transceivers. IC Role / Device Role / Timing Role: High-speed ADC capturing wideband LTE/NR channels with minimal quantization noise and spurious content. Use Value: 88dB SFDR prevents adjacent-channel interference masking weak signals; 0.17psRMS jitter maintains EVM under 1% at 20MHz bandwidth. | Use Scenario: Reconfigurable front-end in military/commercial SDR platforms requiring multi-standard support (FM, DVB-T, LTE). IC Role / Device Role / Timing Role: Flexible sampling engine adapting to varying bandwidth and frequency plans via SPI-controlled modes. Use Value: Selectable 1–2VP-P input range and DDR-LVDS outputs reduce FPGA I/O count and simplify board routing for real-time processing. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer digitizing echo returns from phased-array transducers at 40Msps. IC Role / Device Role / Timing Role: Low-power, high-SNR ADC enabling battery-operated handheld scanners with >12-bit effective resolution. Use Value: 74dB SNR preserves contrast resolution in B-mode images; 49mW power allows integration of 8+ channels on single PCB without forced air cooling. | Use Scenario: Simultaneous sampling of multiple sensors (vibration, temperature, strain) in industrial condition monitoring systems. IC Role / Device Role / Timing Role: Precision digitizer synchronized across channels via shared ENC+ clock for phase-coherent analysis. Use Value: ±1LSB INL and no missing codes ensure accurate FFT-based spectral analysis; nap mode reduces idle power to 9mW per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9246BCPZ-40 | 14-bit, 40Msps, 1.8V supply, but only CMOS outputs (no LVDS); 73.5dB SNR, higher 65mW power | Lacks DDR-LVDS and clock duty cycle stabilizer - requires external clock cleanup and FPGA-compatible termination | Choose when LVDS interface is unnecessary and legacy ADI ecosystem integration is prioritized |
| ADS5272IPFP | 14-bit, 40Msps, 1.8V supply, LVDS outputs only; 72dB SNR, 125mW power; no SPI configuration | No serial interface or programmable features - fixed functionality limits adaptability in multi-mode systems | Choose for cost-sensitive, high-volume applications where configuration flexibility is not required |
Compared with AD9246BCPZ-40 and ADS5272IPFP, the LTC2257IUJ-14#PBF provides superior jitter performance (0.17psRMS vs ≥0.3ps), integrated clock stabilization, and dual-mode digital outputs - reducing BOM count and layout complexity in thermally constrained, multi-standard designs.
Availability
LTC2257IUJ-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio, and portable medical imaging applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2257IUJ-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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2257IUJ-14#PBF belongs to Linear's ultralow-power, high-SFDR ADC family targeting demanding communications and instrumentation applications where dynamic range, power efficiency, and sampling fidelity are critical.
FAQ
What is the maximum input frequency supported by the LTC2257IUJ-14#PBF?
The LTC2257IUJ-14#PBF features an 800MHz full-power bandwidth, allowing it to accurately digitize analog inputs up to that frequency. Measured performance shows 74dB SNR and 88dB SFDR at 70MHz input, with usable dynamic range maintained up to 140MHz in undersampling configurations - confirmed in the datasheet's typical performance graphs (G25–G27).
Does the LTC2257IUJ-14#PBF support external voltage reference operation?
Yes, the LTC2257IUJ-14#PBF supports external reference operation via the SENSE pin (Pin 39). Applying a voltage between 0.625V and 1.3V to SENSE selects an input range scaled to ±0.8×[SENSE], enabling custom full-scale ranges. Internal reference operation (±0.5V or ±1V) is selected by tying SENSE to GND or VDD respectively - all modes are fully characterized in the datasheet (Section 4, Analog Input).
What are the power supply requirements for the LTC2257IUJ-14#PBF?
The LTC2257IUJ-14#PBF requires two supplies: VDD (1.7–1.9V, analog core, 27–30mA typical at 40Msps) and OVDD (1.1–1.9V, digital outputs, current depends on output mode and voltage). Total power dissipation is 49mW in CMOS mode at 40Msps and 139mW in DDR-LVDS mode - values specified in the Power Requirements table (Section 6) under LTC2257-14 conditions.
How does the PAR/SER pin affect the functionality of CS, SCK, and SDI on the LTC2257IUJ-14#PBF?
When PAR/SER (Pin 8) is grounded, the LTC2257IUJ-14#PBF enters serial programming mode: CS becomes chip select, SCK is the SPI clock, and SDI/SDO handle register data. When PAR/SER is tied to VDD, it enters parallel mode: CS controls the clock duty cycle stabilizer, SCK selects output format (CMOS vs LVDS), and SDI enables sleep mode - detailed in the Pin Functions section (Section 15).
Is the LTC2257IUJ-14#PBF pin-compatible with other members of the LTC225x-14 family?
Yes, the LTC2257IUJ-14#PBF is pin-compatible with the LTC2258-14 (65Msps) and LTC2256-14 (25Msps) in the same UJ package. All share identical pinout, footprint, and power sequencing - enabling scalable sampling rate selection within the same PCB layout. This compatibility is explicitly stated in the datasheet's Features section and Order Information table.
LTC2257IUJ-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):
- 40M
- 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:
- -
LTC2257IUJ-14#PBF FAQ
1.How can I place an order for LTC2257IUJ-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2257IUJ-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 LTC2257IUJ-14#PBF reliable?
The price and inventory of LTC2257IUJ-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 LTC2257IUJ-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2257IUJ-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2257IUJ-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2257IUJ-14#PBF?
LTC2257IUJ-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2257IUJ-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 LTC2257IUJ-14#PBF?
For technical support, including LTC2257IUJ-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2257IUJ-14#PBF requirements.
6.How does Aetrix verify that LTC2257IUJ-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2257IUJ-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 LTC2257IUJ-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2257IUJ-14#PBF?
All LTC2257IUJ-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2257IUJ-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 LTC2257IUJ-14#PBF part is unused and in its original packaging.
Return procedure for LTC2257IUJ-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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