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Analog Devices Inc. LTC2257CUJ-12#PBF
- Part No.:
- LTC2257CUJ-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2257CUJ-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,743
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Product details
Overview
LTC2257CUJ-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 systems. It delivers 70.9dB SNR and 90dB SFDR at 30MHz input, operates from a single 1.8V supply, supports CMOS/LVDS DDR outputs, and features 800MHz full-power bandwidth with 0.17psRMS jitter - enabling undersampling of IF signals in cellular base stations and portable medical imaging.
For engineers reviewing the LTC2257CUJ-12#PBF datasheet, LTC2257CUJ-12#PBF pinout, LTC2257CUJ-12#PBF application, or LTC2257CUJ-12#PBF equivalent, this page provides verified technical context, package mapping, output mode configuration details, SPI register control interface behavior, and validated alternative options for 12-bit, 40Msps ADC replacement in RF receiver chains and multi-channel data acquisition.
Technical Context
The LTC2257CUJ-12#PBF implements a pipelined ADC architecture with integrated sample-and-hold, correction logic, and configurable digital output drivers. Its ENC+/ENC– differential clock interface accepts sine wave, LVDS, or PECL inputs, and optional duty cycle stabilization maintains performance across wide clock duty cycles.
Digital outputs are selectable between full-rate CMOS, double-data-rate (DDR) CMOS, or DDR LVDS - with OVDD supporting 1.2V to 1.8V for CMOS swing control and on-chip 100Ω termination for LVDS. The SPI port enables runtime configuration of randomizer, nap/shutdown modes, and output phase alignment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in precision measurement. |
| Sampling Rate | 40Msps - matches mid-tier SDR and ultrasound front-end requirements without oversampling penalty. |
| SNR / SFDR | 70.9dB SNR and 90dB SFDR at 30MHz input - enables detection of weak signals adjacent to strong interferers in baseband receivers. |
| Power Consumption | 47mW at 40Msps (VDD = 1.8V, OVDD = 1.2V, CMOS DDR mode) - reduces thermal load in dense PCB layouts. |
| Analog Input Bandwidth | 800MHz full-power bandwidth - supports direct sampling of L-band and lower S-band RF signals. |
| Jitter Performance | 0.17psRMS aperture jitter - limits noise floor degradation when undersampling >100MHz IFs. |
| INL / DNL | ±0.3LSB typical INL and ±0.1LSB typical DNL - ensures accurate amplitude fidelity in spectral analysis applications. |
Pinout & Package
40-pin (6mm × 6mm) plastic QFN package (UJ), exposed pad soldered to PCB ground for thermal and EMI performance. Pin 41 is exposed pad (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts 1VP-P to 2VP-P input range; common-mode bias set by VCM (Pin 37); supports DC-coupled or AC-coupled RF/IF paths. |
| ENC+, ENC– | Differential encode clock inputs | Trigger conversion on rising/falling edges; support external LVDS/PECL clocks; enable duty cycle stabilizer via CS pin. |
| VDD (Pins 9,10,40) | Analog supply | Single 1.8V rail powers core ADC and reference; requires local 0.1µF ceramic bypass per pin. |
| OVDD (Pin 26) | Digital output supply | Configures CMOS output swing (1.2V–1.8V) or enables LVDS current mode (1.75mA/3.5mA); bypassed with 0.1µF capacitor. |
| D0–D11 | Data outputs | In DDR CMOS mode: paired outputs (e.g., D0_1, D2_3); in DDR LVDS mode: differential pairs (D0_1+, D0_1–) with internal 100Ω termination. |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO active); VDD = parallel mode (CS/SCK/SDI repurposed for hardware control). |
| CLKOUT+, CLKOUT– | Output clock pair | Source-synchronous timing for DDR data; phase adjustable via SPI register; used for FPGA capture clock alignment. |
| SENSE (Pin 39) | Reference programming | Determines input range: tied to VDD → ±1V; grounded → ±0.5V; external 0.625–1.3V → ±0.8×VSENSE - enables flexible signal scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 40Msps | 47mW total dissipation enables battery-powered or thermally constrained SDR platforms without forced cooling. |
| Selectable digital output interface | Hardware-selectable CMOS full-rate, DDR CMOS, or DDR LVDS - simplifies FPGA I/O bank assignment and reduces board-level termination complexity. |
| Integrated clock duty cycle stabilizer | Compensates for asymmetric clock sources (e.g., PLL outputs), preserving timing margin without external retiming ICs. |
| Configurable data randomizer | Reduces deterministic spurs in FFT-based spectrum analyzers by breaking periodic correlation in quantization noise. |
| SPI-controlled nap/sleep modes | Reduces power to 9mW (nap) or 0.5mW (sleep) during idle periods - critical for duty-cycled radar or IoT sensor nodes. |
| On-chip 100Ω LVDS termination | Eliminates need for external resistors in DDR LVDS mode, saving PCB area and improving signal integrity at 40Msps DDR rates. |
Applications
| Cellular Base Station Receiver | Portable Ultrasound Imaging |
|---|---|
|
Use Scenario: Digitizing 70MHz IF signals from zero-IF or low-IF radio architectures in LTE/5G small cells. IC Role / Device Role / Timing Role: High-fidelity ADC front-end capturing wide instantaneous bandwidth with minimal noise folding. Use Value: 90dB SFDR prevents intermodulation distortion from adjacent channel interference; 0.17psRMS jitter preserves EVM under 64-QAM modulation. |
Use Scenario: Sampling echo return signals from piezoelectric transducers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, low-power digitizer interfacing directly to analog beamformer outputs. Use Value: 70.9dB SNR resolves fine tissue contrast; 47mW power enables >2-hour battery life in Class II medical devices. |
| Software Defined Radio (SDR) | Multi-Channel Data Acquisition |
|
Use Scenario: Reconfigurable RF front-end in military/commercial SDRs requiring dynamic bandwidth and resolution switching. IC Role / Device Role / Timing Role: Core ADC with SPI-configurable modes (randomizer, nap, output format) for adaptive signal processing. Use Value: Pin-compatible family (LTC2256/57/58) allows same PCB layout across 25/40/65Msps variants - reducing NRE and qualification effort. |
Use Scenario: Simultaneous sampling of multiple sensor channels (vibration, acoustic emission) in industrial condition monitoring. IC Role / Device Role / Timing Role: High-linearity ADC with ±0.3LSB INL ensuring accurate amplitude calibration across channels. Use Value: 800MHz input bandwidth supports anti-aliasing filter relaxation; DDR LVDS outputs reduce routing congestion in 8+ channel systems. |
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 |
|---|---|---|---|
| AD9226ASTZ-RL7 | 12-bit, 65Msps; 7.5mW/MSPS vs LTC2257's 1.175mW/MSPS; no integrated duty cycle stabilizer or randomizer. | Higher speed but higher power; lacks SPI configurability and low-power nap/sleep modes. | Choose AD9226 only if 65Msps is mandatory and system-level power budget permits ~2× higher dissipation. |
| MAX11270ETX+ | 12-bit, 40Msps delta-sigma architecture; 94dB SNR at 10kHz BW but <60dB SNR above 1MHz; no LVDS output. | Optimized for precision DC/low-frequency sensing, not wideband RF or IF sampling. | Choose MAX11270 only for high-resolution DC-coupled sensor interfaces - not for communications or ultrasound. |
Compared with AD9226ASTZ-RL7 and MAX11270ETX+, the LTC2257CUJ-12#PBF uniquely balances 40Msps throughput, 70.9dB SNR, sub-50mW power, and hardware/SPI configurability - making it optimal for portable RF receivers where thermal headroom and feature flexibility are design constraints.
Availability
LTC2257CUJ-12#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, portable medical imaging, software-defined radio, and multi-channel data acquisition requiring stable component supply across extended production lifecycles.
Supply support for LTC2257CUJ-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving aerospace, communications, and industrial markets with precision signal chain solutions.
The LTC2257CUJ-12#PBF belongs to Linear's ultralow-power, high-SFDR pipeline ADC family designed specifically for undersampling-capable RF receiver front-ends in space-constrained, thermally sensitive applications.
FAQ
What is the operating temperature range for the LTC2257CUJ-12#PBF?
The LTC2257CUJ-12#PBF is rated for 0°C to 70°C ambient operation (C-grade). This is confirmed in the Order Information table on page 3 of the datasheet, where "LTC2257CUJ-12#PBF" is explicitly listed with "0°C to 70°C" under Temperature Range. Industrial-grade alternatives (e.g., LTC2257IUJ-12#PBF) extend to –40°C to 85°C.
Does the LTC2257CUJ-12#PBF support both CMOS and LVDS digital outputs?
Yes, the LTC2257CUJ-12#PBF supports three output modes: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Mode selection is controlled by the PAR/SER pin and SCK level in parallel mode, or via SPI register writes in serial mode. DDR LVDS mode enables on-chip 100Ω termination and 1.75mA/3.5mA current drive.
How is the input voltage range configured on the LTC2257CUJ-12#PBF?
The LTC2257CUJ-12#PBF input range is set by the SENSE pin (Pin 39): tying SENSE to VDD selects ±1V; grounding SENSE selects ±0.5V; applying 0.625V–1.3V externally configures ±0.8×VSENSE. This is documented in the Pin Functions section (page 15) and Analog Input table (page 4), with 1VP-P to 2VP-P range specified for all configurations.
What is the purpose of the PAR/SER pin on the LTC2257CUJ-12#PBF?
The PAR/SER pin (Pin 8) selects the programming interface mode: grounded for serial SPI control (CS/SCK/SDI/SDO active), or tied to VDD for parallel hardware control (CS/SCK/SDI repurposed for duty cycle stabilizer, output mode, and sleep enable). This dual-mode flexibility allows either firmware-driven configuration or fixed-function hardware setup without microcontroller dependency.
Can the LTC2257CUJ-12#PBF be used with a single-ended clock input?
Yes, the LTC2257CUJ-12#PBF supports single-ended clock operation: tie ENC– (Pin 12) to GND and drive ENC+ (Pin 11) with a 1.8V square wave or sine wave. The Absolute Maximum Ratings table (page 2) and Digital Inputs section (page 5) confirm VIH/VIL thresholds and input voltage ranges for this configuration.
LTC2257CUJ-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 40-QFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2257CUJ-12#PBF FAQ
1.How can I place an order for LTC2257CUJ-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2257CUJ-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 LTC2257CUJ-12#PBF reliable?
The price and inventory of LTC2257CUJ-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 LTC2257CUJ-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2257CUJ-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2257CUJ-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2257CUJ-12#PBF?
LTC2257CUJ-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2257CUJ-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 LTC2257CUJ-12#PBF?
For technical support, including LTC2257CUJ-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2257CUJ-12#PBF requirements.
6.How does Aetrix verify that LTC2257CUJ-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2257CUJ-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 LTC2257CUJ-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2257CUJ-12#PBF?
All LTC2257CUJ-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2257CUJ-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 LTC2257CUJ-12#PBF part is unused and in its original packaging.
Return procedure for LTC2257CUJ-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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