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Analog Devices Inc. LTC2257IUJ-12#PBF
- Part No.:
- LTC2257IUJ-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2257IUJ-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,923
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Product details
Overview
LTC2257IUJ-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 40Msps ultralow-power analog-to-digital converter optimized for high-dynamic-range signal digitization in communications and instrumentation systems. It delivers 70.9dB SNR, 90dB SFDR, and 0.17psRMS jitter at 40Msps, with single 1.8V supply operation and selectable CMOS or DDR LVDS outputs - enabling direct interface to FPGAs in portable medical imaging and software-defined radio front ends.
For engineers reviewing the LTC2257IUJ-12#PBF datasheet, LTC2257IUJ-12#PBF pinout, LTC2257IUJ-12#PBF application, or LTC2257IUJ-12#PBF equivalent, this page provides verified package mapping (40-pin 6mm × 6mm QFN), confirmed operating temperature range (–40°C to +85°C), validated SPI configuration interface, and real-world performance data including full-power bandwidth (800MHz), input range selection (1–2VP-P), and low-power modes (Nap: 9mW, Sleep: 0.5mW).
Technical Context
The LTC2257IUJ-12#PBF implements a 12-bit pipelined ADC core with integrated sample-and-hold, correction logic, and configurable digital output drivers. Its architecture supports differential or single-ended encode clocking (ENC+/ENC–), optional duty cycle stabilization, and randomizer-enabled data output to reduce spectral artifacts.
It features dual reference paths - internal 1.25V VREF with ±25ppm/°C drift and external reference support via SENSE pin - enabling precise input range scaling (±0.5V to ±1V). The device operates across three output modes: full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS, each with independent OVDD supply and on-chip termination control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in closed-loop control or precision measurement. |
| Sampling Rate | 40Msps - matches intermediate frequency (IF) sampling requirements for LTE baseband receivers and ultrasound beamforming. |
| SNR / SFDR | 70.9dB SNR and 90dB SFDR at 30MHz input - enables >11 effective bits of resolution for demanding spectral analysis applications. |
| Power Dissipation | 47mW at 40Msps (CMOS mode, OVDD = 1.2V) - allows thermal-constrained portable designs without active cooling. |
| Full-Power Bandwidth | 800MHz - supports undersampling of 300–700MHz IF signals without amplitude roll-off or phase distortion. |
| Input Range | Selectable 1VP-P to 2VP-P differential - simplifies front-end gain staging when interfacing with RF mixers or op-amp drivers. |
| Jitter Sensitivity | 0.17psRMS aperture jitter - limits SNR degradation to <0.1dB at 100MHz input, critical for wideband spectrum sensing. |
Pinout & Package
Package: 40-lead (6mm × 6mm) plastic QFN (UJ package) with exposed pad (Pin 41) soldered to PCB ground for thermal and electrical integrity. Operating temperature range: –40°C to +85°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts 1–2VP-P signal; common-mode voltage set by VCM (nominally VDD/2); supports DC-coupled or AC-coupled inputs. |
| ENC+, ENC– | Differential encode clock inputs | Trigger conversion on rising/falling edges; accepts PECL/LVDS/TTL/CMOS; duty cycle stabilizer available via CS pin. |
| VDD (Pins 9,10,40) | Analog power supply | 1.7–1.9V nominal; requires local 0.1µF ceramic bypass per pin to GND for noise suppression. |
| OVDD (Pin 26) | Digital output supply | Configurable 1.1–1.9V for CMOS outputs or 1.7–1.9V for LVDS; sets output swing and drive strength. |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO); VDD = parallel mode (CS/SCK/SDI repurposed for control). |
| D0–D11 | Data output bus | In full-rate CMOS: 12 single-ended outputs; in DDR CMOS/LVDS: time-multiplexed pairs (e.g., D0_1, D2_3) aligned to CLKOUT+/-. |
| CLKOUT+, CLKOUT– | Output clock pair | Source-synchronous clock for data capture; phase programmable relative to data edges to compensate board trace skew. |
| SENSE (Pin 39) | Reference programming input | Sets input range: tied to VDD → ±1V; tied to GND → ±0.5V; external 0.625–1.3V → ±0.8×VSENSE. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 40Msps | 47mW total dissipation (CMOS mode) - reduces thermal load in multi-channel DAQ systems and battery-powered SDRs. |
| Flexible digital interface | Three output modes (full-rate CMOS, DDR CMOS, DDR LVDS) with independent OVDD - enables interoperability with diverse FPGA I/O banks without level shifters. |
| On-chip clock conditioning | Duty cycle stabilizer corrects asymmetric clocks up to 40MHz - eliminates need for external clock cleanup ICs in cost-sensitive designs. |
| Configurable reference system | Internal 1.25V VREF (±25ppm/°C) or external reference via SENSE pin - supports both fixed-gain and variable-gain analog front ends. |
| Low-latency SPI control | Serial port with 5ns setup/hold timing - allows real-time reconfiguration of output format, randomizer, and power modes during operation. |
Applications
| Cellular Base Station Receiver | Portable Ultrasound Imaging |
|---|---|
Use Scenario: Digitizing 70MHz IF signals from quadrature demodulators in LTE macrocell remote radio heads. IC Role / Device Role / Timing Role: High-speed ADC capturing complex baseband I/Q data with minimal quantization noise and spurious content. Use Value: 90dB SFDR ensures adjacent channel leakage ratio (ACLR) compliance; 800MHz bandwidth supports direct IF sampling without image-reject filtering. | Use Scenario: Sampling echo return signals from piezoelectric transducers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-power, high-SNR ADC enabling real-time B-mode image reconstruction at 40Msps with 12-bit depth. Use Value: 47mW power enables >2-hour battery life in Class II medical devices; 0.17psRMS jitter preserves axial resolution at 10MHz center frequency. |
| Software Defined Radio (SDR) | Multichannel Data Acquisition |
Use Scenario: Wideband spectrum monitoring across 10–100MHz bands in cognitive radio test equipment. IC Role / Device Role / Timing Role: Front-end ADC providing undersampled digitization with deterministic latency for real-time FFT processing. Use Value: Programmable DDR LVDS output synchronizes cleanly with Xilinx Zynq PS/PL interfaces; Nap mode (9mW) enables rapid wake-up between scan intervals. | Use Scenario: Simultaneous acquisition from 8+ sensor channels in industrial vibration analyzers using time-interleaved ADC arrays. IC Role / Device Role / Timing Role: Precision ADC with matched INL (±0.3LSB) and DNL (±0.1LSB) ensuring channel-to-channel coherence. Use Value: Pin-compatible family (LTC2256/LTC2257/LTC2258) allows scalable channel count without PCB redesign; SPI register access enables per-channel gain calibration. |
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; 3.3V supply; no integrated duty cycle stabilizer; SPI interface absent. | Requires external clock cleanup and level-shifting for 1.8V FPGA interfaces; higher power (225mW). | Choose when legacy 3.3V system integration is required and jitter budget permits external clock conditioning. |
| LTC2256IUJ-12#PBF | Same pinout and feature set; lower 25Msps sampling rate; 34mW power at 25Msps. | Better suited for lower-bandwidth applications like seismic data logging or audio spectrum analysis where SNR >70dB is sufficient. | Choose for cost-optimized, lower-power deployments where 25Msps meets system Nyquist requirement. |
Compared with AD9226ASTZ-RL7 and LTC2256IUJ-12#PBF, the LTC2257IUJ-12#PBF uniquely balances 40Msps throughput, sub-50mW power, and integrated clock/data conditioning - making it optimal for thermally constrained, medium-bandwidth SDR and medical imaging platforms requiring minimal external components.
Availability
LTC2257IUJ-12#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, software-defined radio, and multichannel data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2257IUJ-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 LTC2257IUJ-12#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for undersampling and IF digitization in communications infrastructure and portable instrumentation where dynamic range, power efficiency, and integration density are critical.
FAQ
What is the maximum sampling rate supported by the LTC2257IUJ-12#PBF?
The LTC2257IUJ-12#PBF supports a maximum sampling rate of 40Msps, as specified in its orderable part number suffix "-12" and confirmed in the Absolute Maximum Ratings and Dynamic Accuracy tables. This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) with proper power supply decoupling and clock signal integrity. At 40Msps, the LTC2257IUJ-12#PBF achieves 70.9dB SNR and 90dB SFDR with a 30MHz input tone.
Does the LTC2257IUJ-12#PBF support both CMOS and LVDS digital outputs?
Yes, the LTC2257IUJ-12#PBF supports three distinct digital output configurations: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS - selected via the SCK pin in parallel programming mode or SPI register settings in serial mode. DDR LVDS mode requires OVDD = 1.7–1.9V and enables on-chip 100Ω termination; CMOS modes support OVDD from 1.1V to 1.9V for flexible FPGA I/O compatibility.
What is the function of the SENSE pin on the LTC2257IUJ-12#PBF?
The SENSE pin on the LTC2257IUJ-12#PBF configures the ADC's input full-scale range: tying SENSE to VDD selects ±1V differential range; tying to GND selects ±0.5V; applying an external voltage (0.625–1.3V) scales the range to ±0.8×VSENSE. This allows precise matching to downstream amplifier gains or transformer-coupled front ends without external resistive dividers - a key feature confirmed in the Analog Input section of the datasheet.
Can the LTC2257IUJ-12#PBF operate with a single 1.8V supply?
Yes, the LTC2257IUJ-12#PBF operates from a single 1.8V analog supply (VDD = 1.7–1.9V) and supports independent digital output supply (OVDD = 1.1–1.9V for CMOS, 1.7–1.9V for LVDS). This dual-supply flexibility enables low-noise analog operation while optimizing digital interface levels - verified in the Power Requirements table where IVDD = 26.3mA and IOVDD = 1.5mA (CMOS, OVDD = 1.2V) yield 47mW total dissipation.
Is the LTC2257IUJ-12#PBF pin-compatible with other members of the LTC225x family?
Yes, the LTC2257IUJ-12#PBF is pin-compatible with the LTC2256IUJ-12#PBF (25Msps) and LTC2258IUJ-12#PBF (65Msps) in the same 40-pin QFN package, sharing identical pin functions, power domains, and interface protocols. This allows scalable system design - for example, upgrading sampling rate without PCB revision - as explicitly stated in the datasheet's "Pin Compatible 14-Bit and 12-Bit Versions" feature list.
LTC2257IUJ-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):
- 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-12#PBF FAQ
1.How can I place an order for LTC2257IUJ-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2257IUJ-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 LTC2257IUJ-12#PBF reliable?
The price and inventory of LTC2257IUJ-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 LTC2257IUJ-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2257IUJ-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2257IUJ-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2257IUJ-12#PBF?
LTC2257IUJ-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2257IUJ-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 LTC2257IUJ-12#PBF?
For technical support, including LTC2257IUJ-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2257IUJ-12#PBF requirements.
6.How does Aetrix verify that LTC2257IUJ-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2257IUJ-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 LTC2257IUJ-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2257IUJ-12#PBF?
All LTC2257IUJ-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2257IUJ-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 LTC2257IUJ-12#PBF part is unused and in its original packaging.
Return procedure for LTC2257IUJ-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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