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Analog Devices Inc. LTC2257CUJ-12#TRPBF
- Part No.:
- LTC2257CUJ-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2257CUJ-12#TRPBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,331
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Product details
Overview
LTC2257CUJ-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 40Msps ultralow-power analog-to-digital converter with 70.7dB SNR and 84dB SFDR at 70MHz input, operating from a single 1.8V supply and supporting CMOS, DDR CMOS, or DDR LVDS digital outputs. It serves as the front-end digitizer in high-dynamic-range RF signal chains for software-defined radios and portable medical imaging systems.
For engineers reviewing the LTC2257CUJ-12#TRPBF datasheet, LTC2257CUJ-12#TRPBF pinout, LTC2257CUJ-12#TRPBF application, or LTC2257CUJ-12#TRPBF equivalent, key selection criteria include its 40Msps sampling rate, 800MHz full-power bandwidth, 0.17psRMS aperture jitter, selectable 1–2VP-P input range, and SPI-configurable clock duty cycle stabilizer and output randomizer.
Technical Context
This ADC employs a pipelined architecture with integrated sample-and-hold and correction logic to achieve 70.7dB SNR and ±0.3LSB INL over temperature. Its 800MHz full-power bandwidth enables undersampling of IF signals up to 140MHz while maintaining spurious-free performance.
Digital interface flexibility includes full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS outputs, with separate OVDD supply enabling 1.2–1.8V CMOS swing control. The ENC+/ENC– differential clock inputs accept PECL, LVDS, TTL, or CMOS signals, and optional clock duty cycle stabilization ensures consistent timing across wide input duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Sampling Rate | 40Msps - supports real-time digitization of wideband IF signals in SDR and test equipment. |
| SNR @ 70MHz | 70.7dB (typ) - enables high-fidelity capture of low-level signals embedded in noise floor. |
| SFDR @ 70MHz | 84dB (typ, 2nd/3rd harmonic) - suppresses distortion artifacts critical in multi-tone communication systems. |
| Aperture Jitter | 0.17psRMS - minimizes sampling uncertainty, preserving SNR when undersampling GHz-range carriers. |
| Power Dissipation | 47mW (typ, sine input, CMOS mode) - allows battery-powered portable instrumentation without thermal throttling. |
| Input Bandwidth | 800MHz full-power - permits direct digitization of L-band and S-band RF signals without external downconversion. |
| Supply Voltage | Single 1.8V analog (VDD) + independent 1.2–1.9V digital (OVDD) - simplifies power delivery and reduces noise coupling between analog and digital domains. |
Pinout & Package
40-pin (6mm × 6mm) plastic QFN package (UJ), exposed pad soldered to PCB ground for thermal and electrical integrity. Pin 41 is exposed pad (GND).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input | Accepts 1–2VP-P signal with 800MHz bandwidth; common-mode bias set by VCM pin. |
| ENC+, ENC– | Differential encode clock input | Triggers conversion on both edges; supports 1.8V–3.3V logic families and enables duty cycle stabilization via CS pin. |
| VDD (Pins 9,10,40) | Analog supply | 1.8V ±0.1V supply requiring local 0.1µF ceramic bypassing per pin group. |
| OVDD (Pin 26) | Digital output supply | Configurable 1.2–1.9V rail sets CMOS output swing or enables LVDS termination (100Ω internal). |
| D0–D11 | Data outputs | In full-rate CMOS mode: 12 single-ended outputs; in DDR modes: paired outputs (e.g., D0_1) synchronized to CLKOUT±. |
| CLKOUT+, CLKOUT– | Output clock pair | LVDS or CMOS clock aligned to data transitions; phase programmable via SPI to manage setup/hold timing margins. |
| PAR/SER | Programming mode select | Ground = serial SPI interface (CS/SCK/SDI/SDO active); VDD = parallel control (CS/SCK/SDI repurposed for functional configuration). |
| SENSE | Reference programming | Defines input range: VDD → ±1V, GND → ±0.5V, external 0.625–1.3V → ±0.8×VSENSE - enables precise gain matching in multi-channel systems. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power at 40Msps | 47mW typical dissipation enables dense channel count in multi-ADC arrays without forced air cooling. |
| Selectable output interface | Hardware-selectable CMOS / DDR CMOS / DDR LVDS eliminates need for external level translators or serializers. |
| Integrated clock duty cycle stabilizer | Compensates for asymmetric clock sources without external PLLs, ensuring stable timing margins across process/voltage/temperature. |
| SPI-configurable features | Enables runtime adjustment of output randomizer, clock delay, and power modes - critical for adaptive receiver calibration. |
| 800MHz analog input bandwidth | Supports direct RF sampling of cellular, WiFi, and radar IF bands without external amplifiers or filters. |
| 0°C to 70°C operating range | Industrial-grade temperature rating suitable for base station remote radio units and portable diagnostic equipment. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing 20–40MHz wide LTE/5G IF signals at 70–140MHz center frequency in remote radio heads. IC Role / Device Role / Timing Role: Primary ADC front-end with 800MHz bandwidth and 0.17psRMS jitter enabling clean undersampling and high adjacent-channel rejection. Use Value: 84dB SFDR prevents intermodulation distortion from masking weak adjacent channels in crowded spectrum environments. | Use Scenario: Reconfigurable wideband receiver in military comms or spectrum monitoring systems requiring real-time FFT analysis. IC Role / Device Role / Timing Role: High-linearity digitizer interfaced to FPGA via DDR LVDS for low-skew, high-throughput data streaming. Use Value: SPI-configurable output randomizer and clock delay reduce deterministic jitter and simplify FPGA timing closure. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer digitizing 5–15MHz echo signals in handheld Doppler or B-mode scanners. IC Role / Device Role / Timing Role: Low-power 12-bit ADC with 70.7dB SNR capturing microvolt-level tissue reflections while minimizing battery drain. Use Value: 47mW power consumption extends battery life beyond 8 hours per charge in Class II medical devices. | Use Scenario: Simultaneous sampling of 8+ sensor channels (vibration, acoustic emission, strain) in industrial condition monitoring. IC Role / Device Role / Timing Role: Channel-matched ADC with ±0.3LSB INL and programmable SENSE pin enabling calibrated gain scaling across all inputs. Use Value: Selectable 1–2VP-P input range allows optimal dynamic range allocation per sensor type without external PGA reconfiguration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS52J90IRGCT | 12-bit, 80Msps, JESD204B serial output, 1.25V supply, 110mW power | Targets high-channel-count systems using FPGA JESD204B receivers; lacks analog input bandwidth (500MHz) and requires external clock conditioning | Choose for JESD204B-based systems needing >40Msps; avoid if analog simplicity, low power, or 800MHz bandwidth are required |
| AD9226ASTZ | 12-bit, 65Msps, parallel CMOS output, 5V supply, 1.1W power, no SPI config | Legacy industrial ADC with higher power and fixed 2.5V input range; no clock stabilizer or output randomizer | Choose only for legacy 5V designs where SPI configurability and ultralow power are not needed |
Compared with ADS52J90IRGCT and AD9226ASTZ, the LTC2257CUJ-12#TRPBF delivers superior power efficiency (47mW vs 110mW/1100mW), wider analog bandwidth (800MHz vs 500MHz/-), and on-chip configurability - making it optimal for portable, thermally constrained, or undersampling-centric designs.
Availability
LTC2257CUJ-12#TRPBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging requiring stable component supply and long-term production continuity.
Supply support for LTC2257CUJ-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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and DSP technologies, serving communications, industrial, automotive, and healthcare markets.
The LTC2257 series belongs to Linear's ultralow-power, high-SFDR pipeline ADC family designed specifically for demanding communications and instrumentation applications requiring exceptional dynamic range at minimal power.
FAQ
What is the maximum sampling rate supported by the LTC2257CUJ-12#TRPBF?
The LTC2257CUJ-12#TRPBF supports a maximum sampling rate of 40Msps, as specified in its part number suffix "-12" and confirmed in the Absolute Maximum Ratings and Dynamic Accuracy tables. This rate is optimized for 70.7dB SNR and 84dB SFDR performance at 70MHz input frequency, with power consumption held to 47mW typical in CMOS output mode.
Does the LTC2257CUJ-12#TRPBF support differential analog input?
Yes, the LTC2257CUJ-12#TRPBF is designed for true differential analog input operation via AIN+ (Pin 1) and AIN– (Pin 2). Its specifications - including ±0.3LSB INL, 70.7dB SNR, and 84dB SFDR - are all measured under differential input conditions with 1–2VP-P range and common-mode bias provided by the VCM pin.
What digital output interfaces does the LTC2257CUJ-12#TRPBF support?
The LTC2257CUJ-12#TRPBF supports three configurable digital output interfaces: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Interface selection is determined by hardware configuration (SCK pin state in parallel mode) and can be further refined via SPI register writes, allowing flexible integration with FPGAs, ASICs, or processors with varying I/O voltage and timing requirements.
How is the input voltage range configured on the LTC2257CUJ-12#TRPBF?
The input voltage range of the LTC2257CUJ-12#TRPBF is configured via the SENSE pin (Pin 39): tying SENSE to VDD selects ±1V range, grounding it selects ±0.5V, and applying an external 0.625–1.3V reference sets ±0.8×VSENSE. This hardware-programmable range enables precise signal scaling without external gain stages, directly supporting the device's 1–2VP-P specification.
Is the LTC2257CUJ-12#TRPBF pin-compatible with other members of the LTC225x-12 family?
Yes, the LTC2257CUJ-12#TRPBF is pin-compatible with the LTC2258-12 and LTC2256-12, sharing identical 40-pin QFN (UJ) packaging, pin functions, and layout footprint. This allows drop-in substitution across 65/40/25Msps variants, simplifying design reuse and scalability while maintaining identical power, thermal, and routing constraints.
LTC2257CUJ-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):
- 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#TRPBF FAQ
1.How can I place an order for LTC2257CUJ-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2257CUJ-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 LTC2257CUJ-12#TRPBF reliable?
The price and inventory of LTC2257CUJ-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 LTC2257CUJ-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2257CUJ-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2257CUJ-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2257CUJ-12#TRPBF?
LTC2257CUJ-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2257CUJ-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 LTC2257CUJ-12#TRPBF?
For technical support, including LTC2257CUJ-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2257CUJ-12#TRPBF requirements.
6.How does Aetrix verify that LTC2257CUJ-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2257CUJ-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 LTC2257CUJ-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2257CUJ-12#TRPBF?
All LTC2257CUJ-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2257CUJ-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 LTC2257CUJ-12#TRPBF part is unused and in its original packaging.
Return procedure for LTC2257CUJ-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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