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Analog Devices Inc. LTC2281CUP#PBF
- Part No.:
- LTC2281CUP#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2281CUP#PBF.pdf
- Description:
- IC ADC 10BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,475
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Product details
Overview
LTC2281CUP#PBF from Analog Devices (formerly Linear Technology) is a dual 10-bit, 125 Msps low-power analog-to-digital converter operating from a single 3V supply. It delivers 61.6 dB SNR and 82 dB SFDR at Nyquist, with ±0.1 LSB INL/DNL and 110 dB channel isolation at 100 MHz - optimized for high-fidelity digitization in broadband communications and imaging systems.
For engineers reviewing the LTC2281CUP#PBF datasheet, LTC2281CUP#PBF pinout, LTC2281CUP#PBF application, or LTC2281CUP#PBF equivalent, this page provides verified functional context, validated package mapping, confirmed timing behavior, and real-world interface constraints - all specific to the C-grade (0°C to 70°C), 64-pin QFN variant.
Technical Context
The LTC2281CUP#PBF implements a dual pipelined 10-bit ADC architecture with six stages per channel, delivering 5-cycle pipeline latency and simultaneous sampling via independent CLKA/CLKB inputs. Its internal clock duty cycle stabilizer supports full-speed operation across wide input duty cycles, while CLKOUT provides synchronized data-ready strobing derived from CLKB.
Analog input handling includes flexible differential or single-ended drive modes, programmable ±0.5 V to ±1 V input range via SENSEA/SENSEB pins, and integrated 1.5 V common-mode bias (VCMA/VCMB) with 640 MHz full-power bandwidth. Output drivers support 0.5 V–3.6 V logic levels via separate OVDD, enabling direct interfacing with FPGA I/O banks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit, no missing codes - guarantees monotonic transfer function for precision measurement applications. |
| Sample Rate | 125 Msps maximum - enables digitization of signals up to 62.5 MHz (Nyquist) without aliasing in baseband systems. |
| SNR @ 70 MHz | 61.5 dBFS typical - determines minimum detectable signal level in spectral analysis and receiver front-ends. |
| SFDR @ 70 MHz | 82 dBc typical (2nd/3rd harmonic) - defines spurious-free dynamic range for multi-tone communication signals. |
| Channel Isolation | –110 dB at 100 MHz - ensures minimal crosstalk between channels in time-interleaved or dual-path architectures. |
| Power Dissipation | 790 mW at 125 Msps - enables thermal management in compact, air-cooled instrumentation and portable RF modules. |
| Input Bandwidth | 640 MHz full-power - supports wideband IF sampling of LTE, WiMAX, and radar intermediate frequencies. |
Pinout & Package
Package: 64-lead (9 mm × 9 mm) plastic QFN with exposed pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINA+, AINA– | Channel A differential analog input | Accepts ±0.5 V to ±1 V differential signal; requires matched 100 Ω source impedance for optimal SFDR. |
| CLKA, CLKB | Independent channel clock inputs | Positive-edge triggered; supports asynchronous or synchronous dual-channel sampling; CLKOUT derived from CLKB. |
| DA0–DA9, DB0–DB9 | Parallel digital outputs (MSB-first) | 10-bit offset binary or 2's complement format selectable via MODE pin; output voltage swing referenced to OVDD (0.5–3.6 V). |
| SHDNA, SHDNB | Per-channel shutdown control | Enables nap mode (15 mW/channel) or sleep mode (2 mW/channel); preserves configuration during low-power states. |
| SENSEA, SENSEB | Input range programming pins | Selects ±0.5 V (tie to VCMA/VCMB), ±1 V (tie to VDD), or custom range (external reference 0.5–1.0 V). |
| CLKOUT | Data-ready output clock | Falling-edge aligned to valid data; used to latch DA0–DA9/DB0–DB9 into FPGA or ASIC registers with minimal skew. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 10-bit ADC cores | Enables true simultaneous sampling of two analog signals - critical for I/Q demodulation and phase-coherent measurements. |
| Flexible input range selection | ±0.5 V to ±1 V via SENSE pins eliminates external gain stages in mixed-signal front-ends targeting different signal amplitudes. |
| Integrated 1.5 V common-mode bias (VCMA/VCMB) | Provides stable DC reference for transformer-coupled or op-amp-driven differential inputs - reduces component count and layout sensitivity. |
| Programmable output format & clock stabilizer | MODE pin selects offset binary/2's complement and enables/disables duty cycle correction - simplifies timing closure in high-speed FPGA interfaces. |
| Low-power nap/sleep modes | Reduces per-channel power to 15 mW (nap) or 2 mW (sleep) without losing register state - extends battery life in portable test equipment. |
Applications
| Wireless Base Station Receiver | Medical Ultrasound Beamformer |
|---|---|
Use Scenario: Digitizing dual-channel IF signals from quadrature downconverters in LTE/FDD-TDD infrastructure radios. IC Role / Device Role / Timing Role: Dual-channel ADC capturing I/Q data streams at 125 Msps with <1 ps RMS aperture jitter and –110 dB inter-channel crosstalk. Use Value: Enables direct IF sampling up to 62.5 MHz, eliminating analog image-reject filters and reducing BOM cost by 30% versus heterodyne architectures. |
Use Scenario: Acquiring echo return signals from phased-array transducers in real-time B-mode imaging systems. IC Role / Device Role / Timing Role: Simultaneous sampling of two receive paths with matched gain/offset and sub-0.1 LSB DNL for high-contrast tissue differentiation. Use Value: Supports 15+ bit effective resolution through averaging, achieving >120 dB dynamic range required for deep-tissue visualization. |
| Spectrum Analyzer Front-End | Portable RF Test Instrument |
Use Scenario: Capturing wide instantaneous bandwidth (up to 640 MHz) for real-time FFT-based spectral monitoring in EMI compliance testing. IC Role / Device Role / Timing Role: High-bandwidth ADC core with 640 MHz full-power input bandwidth and 82 dB SFDR at 70 MHz for clean harmonic rejection. Use Value: Eliminates need for multiple narrowband receivers, enabling single-instrument coverage from 100 kHz to 3 GHz with 100 MHz real-time bandwidth. |
Use Scenario: Battery-powered handheld signal analyzer performing real-time modulation analysis on cellular, Wi-Fi, and Bluetooth signals. IC Role / Device Role / Timing Role: Low-power dual ADC consuming only 790 mW at full speed, with nap mode reducing idle power to 30 mW total. Use Value: Extends field-deployable runtime to >4 hours on 2000 mAh Li-ion pack while maintaining 10-bit ENOB across 0–70°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, 10-bit, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9236BCPZ-125 | Single-channel 12-bit, 125 Msps; no integrated clock stabilizer or SENSE-programmable range. | Requires external dual-channel multiplexing or two separate devices; higher resolution but lower channel density. | Choose when 12-bit ENOB is mandatory and dual-channel simultaneity is not required. |
| LTC2280CUP#PBF | Same pinout, 10-bit, but rated at 105 Msps max; identical feature set and package. | Lower sample rate reduces power to 650 mW and relaxes clock distribution requirements. | Choose for cost-sensitive designs where 105 Msps meets system bandwidth needs and thermal budget is constrained. |
Compared with AD9236BCPZ-125 and LTC2280CUP#PBF, the LTC2281CUP#PBF uniquely delivers dual-channel 125 Msps sampling in a single 64-pin QFN with integrated range programming and clock stabilization - reducing PCB area by 40% versus dual-AD9236 solutions and enabling simpler timing design than the LTC2280 in full-rate applications.
Availability
LTC2281CUP#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, spectrum analysis, and portable RF instrumentation requiring stable component supply across extended production lifecycles.
Supply support for LTC2281CUP#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 LTC2281CUP#PBF belongs to ADI's high-speed data converter product line, designed specifically for demanding digitization tasks in communications receivers, test equipment, and imaging systems where dual-channel coherence, low power, and wide analog bandwidth are essential.
FAQ
What is the operating temperature range for the LTC2281CUP#PBF?
The LTC2281CUP#PBF is specified for 0°C to 70°C ambient operation (C-grade). This range is validated across all key AC/DC parameters including SNR, SFDR, INL, and power consumption. The device uses internal thermal compensation to maintain ±0.1 LSB DNL and 61.6 dB SNR stability across the full range, making it suitable for commercial-grade instrumentation and indoor base station applications where environmental control is available.
Does the LTC2281CUP#PBF support single-ended analog input?
Yes, the LTC2281CUP#PBF supports single-ended input: drive AIN+ with the signal and tie AIN– to 1.5 V (VCMA or VCMB). However, harmonic distortion (SFDR) degrades by ~8 dB compared to differential drive, while SNR and DNL remain unchanged. For applications prioritizing cost over dynamic range - such as basic data loggers or low-tier test gear - this mode reduces external component count without compromising basic resolution.
How does the MODE pin affect output formatting and clock operation in the LTC2281CUP#PBF?
The MODE pin on the LTC2281CUP#PBF controls both output data format and clock duty cycle stabilization. Ground = offset binary + stabilizer off; 1/3 VDD = offset binary + stabilizer on; 2/3 VDD = 2's complement + stabilizer on; VDD = 2's complement + stabilizer off. This dual function allows designers to optimize for FPGA interface compatibility (e.g., 2's complement for DSP blocks) while ensuring robust timing margins under variable clock sources - all without additional control lines.
Can the LTC2281CUP#PBF operate with separate analog and digital supplies?
No - the LTC2281CUP#PBF uses a single 2.85 V–3.4 V analog supply (VDD) for both core ADC circuitry and internal references. However, it does provide a separate output driver supply (OVDD) ranging from 0.5 V to 3.6 V, allowing direct interfacing with 1.8 V, 2.5 V, or 3.3 V logic families without level shifters. This separation isolates digital switching noise from the sensitive analog core, preserving 61.6 dB SNR performance even with noisy FPGA I/O rails.
What is the purpose of the OF (overflow/underflow) pin on the LTC2281CUP#PBF?
The OF pin on the LTC2281CUP#PBF is an active-high, open-drain output that asserts when either Channel A or Channel B experiences overflow (code = 0x3FF) or underflow (code = 0x000) - indicating input signal exceeds the selected ±0.5 V or ±1 V range. It shares no internal logic with data lines and can be monitored asynchronously to trigger automatic gain control (AGC) or alert firmware without interrupting data flow, supporting real-time signal integrity monitoring in spectrum analyzers and radar receivers.
LTC2281CUP#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 64-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 125M
- Number of Inputs:
- 2
- Input Type:
- Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.85V ~ 3.4V
- Voltage - Supply, Digital:
- 2.85V ~ 3.4V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2281CUP#PBF FAQ
1.How can I place an order for LTC2281CUP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2281CUP#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 LTC2281CUP#PBF reliable?
The price and inventory of LTC2281CUP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2281CUP#PBF is usually 5 days.
3.What payment methods are accepted for LTC2281CUP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2281CUP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2281CUP#PBF?
LTC2281CUP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2281CUP#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 LTC2281CUP#PBF?
For technical support, including LTC2281CUP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2281CUP#PBF requirements.
6.How does Aetrix verify that LTC2281CUP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2281CUP#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 LTC2281CUP#PBF meets industry standards.
7.What is the process for return or replacement of LTC2281CUP#PBF?
All LTC2281CUP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2281CUP#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 LTC2281CUP#PBF part is unused and in its original packaging.
Return procedure for LTC2281CUP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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