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Analog Devices Inc. LTC2281IUP#PBF
- Part No.:
- LTC2281IUP#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2281IUP#PBF.pdf
- Description:
- IC ADC 10BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,149
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Product details
Overview
LTC2281IUP#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, 640 MHz full-power bandwidth, and 110 dB channel isolation at 100 MHz - optimized for high-fidelity digitization in broadband communications and imaging systems.
For engineers reviewing the LTC2281IUP#PBF datasheet, LTC2281IUP#PBF pinout, LTC2281IUP#PBF application, or LTC2281IUP#PBF equivalent, key selection criteria include dual-channel synchronization capability, flexible input range (±0.5 V to ±1 V), clock duty cycle stabilization, data-ready CLKOUT timing, and QFN-64 package compatibility with thermal management via exposed pad soldering.
Technical Context
The LTC2281IUP#PBF implements a six-stage pipelined ADC architecture per channel, achieving 5-cycle pipeline latency with simultaneous sampling on independent CLKA/CLKB inputs or synchronized operation when tied. Its internal 1.5 V common-mode reference (VCMA/VCMB) and programmable SENSEA/SENSEB pins enable precise ±0.5 V or ±1 V differential input ranges without external components.
It integrates a clock duty cycle stabilizer (enabled via MODE pin), shutdown/nap modes reducing power to 2 mW or 15 mW per channel, and multiplexed or independent digital output busses (DA0–DA9/DB0–DB9) controlled by MUX pin. The OF pin provides shared overflow/underflow detection across both channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit with no missing codes - guarantees monotonic transfer function for accurate signal reconstruction. |
| Sample Rate | 125 Msps maximum - supports real-time digitization of signals up to 62.5 MHz (Nyquist) in wideband applications. |
| SNR / SFDR | 61.6 dB SNR and 82 dB SFDR at 70 MHz input - enables high dynamic range capture in spectral analysis and wireless receivers. |
| Power Dissipation | 790 mW typical at 125 Msps - low-power operation enabled by single 3V analog supply and separate 0.5–3.6V output supply (OVDD). |
| Input Bandwidth | 640 MHz full-power bandwidth - preserves fidelity of fast-rising RF and IF signals without attenuation. |
| Channel Isolation | 110 dB at 100 MHz - prevents crosstalk between A/B channels in time-interleaved or dual-path architectures. |
| Transition Noise | 0.08 LSBRMS - minimizes quantization uncertainty in precision measurement and test equipment. |
Pinout & Package
Package: 64-lead (9 mm × 9 mm) plastic QFN with exposed thermal 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− AINB+, AINB− |
Differential analog inputs (Ch A & Ch B) | Accept ±0.5 V to ±1 V differential signals; require matched 100 Ω source impedance for optimal SFDR. |
| CLKA, CLKB | Independent sample clock inputs | Positive-edge triggered; can be tied for synchronous dual-channel sampling or driven separately for staggered acquisition. |
| DA0–DA9, DB0–DB9 | Parallel digital outputs (10-bit, MSB-first) | Configurable bus assignment via MUX pin; support independent or multiplexed readout onto one data bus. |
| CLKOUT | Data-ready strobe output | Derived from CLKB; falling edge latches valid output data - eliminates setup/hold timing uncertainty in FPGA/ASIC interfaces. |
| SHDNA, SHDNB OEA, OEB |
Per-channel shutdown & output enable | Four combinations: normal, high-Z, nap mode (15 mW/ch), sleep mode (2 mW/ch) - enables dynamic power scaling. |
| SENSEA, SENSEB | Input range programming pins | Select ±0.5 V (tie to VCMA/VCMB), ±1 V (tie to VDD), or custom range (external 0.5–1 V reference) - no external resistors needed. |
| MODE | Output format & duty cycle control | GND = offset binary + DCS off; 1/3 VDD = offset binary + DCS on; 2/3 VDD = 2's complement + DCS on - configures interface logic and jitter tolerance. |
| OF | Shared overflow/underflow flag | Active-high pulse indicates saturation on either channel - simplifies error handling in real-time DSP pipelines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent ADC cores | Enables true simultaneous sampling or time-interleaved operation without inter-channel skew or calibration overhead. |
| Programmable input range (±0.5 V / ±1 V) | Eliminates need for external gain stages or level-shifting circuits - reduces BOM count and layout complexity. |
| Integrated clock duty cycle stabilizer | Compensates for >30%–70% input clock duty cycle variation - ensures consistent aperture jitter and SNR at full 125 Msps rate. |
| Low-latency 5-cycle pipeline | Minimizes processing delay in closed-loop systems (e.g., adaptive RF front-ends, real-time beamforming). |
| Flexible output supply (0.5–3.6 V OVDD) | Direct interfacing to 1.8 V, 2.5 V, or 3.3 V logic families without level shifters - simplifies FPGA/CPLD integration. |
| 110 dB channel isolation at 100 MHz | Supports high-fidelity dual-path architectures (e.g., I/Q demodulation, diversity receivers) without cross-coupling artifacts. |
Applications
| Wireless Base Station Receiver | Medical Ultrasound Imaging |
|---|---|
|
Use Scenario: Digitizing dual-channel IF signals (e.g., I/Q paths) from zero-IF or low-IF radio architectures in LTE/5G macrocells. IC Role / Device Role / Timing Role: Dual-channel ADC capturing synchronized 125 Msps samples with <0.6 ns data-to-CLKOUT skew for deterministic FPGA-based demodulation. Use Value: 110 dB channel isolation prevents I/Q crosstalk-induced EVM degradation; 640 MHz bandwidth preserves wideband modulation fidelity. |
Use Scenario: High-speed beamforming in portable ultrasound systems requiring real-time echo signal digitization from multiple transducer elements. IC Role / Device Role / Timing Role: Dual ADC acquiring parallel RF echo returns with sub-ns timing alignment to enable coherent summation and spatial resolution enhancement. Use Value: 61.6 dB SNR at 70 MHz enables detection of weak tissue echoes; low 0.08 LSBRMS transition noise improves contrast resolution. |
| Spectrum Analyzer Front-End | Test & Measurement Digitizer |
|
Use Scenario: Wideband signal acquisition in handheld spectrum analyzers covering DC–100 MHz with real-time FFT processing. IC Role / Device Role / Timing Role: Dual ADC providing 125 Msps sampling with programmable ±1 V input range to maximize dynamic range across frequency sweeps. Use Value: 82 dB SFDR suppresses harmonic spurs during multi-tone analysis; integrated CLKOUT eliminates external latch timing design. |
Use Scenario: Modular digitizer card in automated test equipment (ATE) requiring calibrated dual-channel acquisition with low power and thermal footprint. IC Role / Device Role / Timing Role: Precision ADC delivering ±0.1 LSB INL/DNL and stable 61.6 dB SNR over –40°C to +85°C industrial temperature range. Use Value: Guaranteed specs across full temp range reduce system-level calibration burden; QFN-64 package enables compact, thermally robust PCB layout. |
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 |
|---|---|---|---|
| AD9218BSTZ-105 | 10-bit, 105 Msps, 3.3 V supply, 60 dB SNR, no integrated clock stabilizer, 48-lead LQFP | Limited to 105 Msps; lower SNR and no DCS requires tight clock duty cycle control - less tolerant of FPGA-generated clocks. | Choose for cost-sensitive, lower-speed applications where 105 Msps suffices and board space allows larger LQFP package. |
| LTC2280IUP#PBF | Same family, 10-bit, 105 Msps, identical pinout/package, same features but lower max sample rate and power (620 mW) | Drop-in replacement with reduced speed/power - suitable when 105 Msps meets system requirements and thermal budget is constrained. | Choose for pin-compatible migration path when system does not require full 125 Msps, enabling lower power and simplified clock design. |
Compared with AD9218BSTZ-105 and LTC2280IUP#PBF, the LTC2281IUP#PBF uniquely delivers 125 Msps with integrated clock duty cycle stabilization and 110 dB channel isolation - critical for wideband, synchronized dual-channel systems where timing margin and crosstalk are design-limiting factors.
Availability
LTC2281IUP#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, spectrum analysis, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2281IUP#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 semiconductors for precision instrumentation, communications, and industrial applications.
The LTC2281IUP#PBF belongs to Linear's high-speed ADC product line, designed specifically for demanding digitization tasks in communications receivers, imaging systems, and portable test equipment where dynamic range, channel matching, and low power are essential.
FAQ
What is the operating temperature range of the LTC2281IUP#PBF?
The LTC2281IUP#PBF is rated for industrial operation from –40°C to +85°C, as confirmed by its "I" grade designation and Absolute Maximum Ratings table. This range covers most embedded, outdoor, and industrial environments without derating, and all key AC/DC specifications (e.g., SNR, INL, power) are guaranteed across this full span.
Does the LTC2281IUP#PBF support single-ended analog input drive?
Yes, the LTC2281IUP#PBF supports single-ended input drive: connect AIN+ to the signal and AIN– to 1.5 V (VCM) or a stable DC bias. However, harmonic distortion and INL degrade versus differential drive - SNR and DNL remain unchanged. For optimal performance, differential drive with matched 100 Ω source impedance is recommended.
How is the input voltage range configured on the LTC2281IUP#PBF?
The LTC2281IUP#PBF uses SENSEA and SENSEB pins to configure input range: tie SENSEA to VCMA for ±0.5 V range on Channel A, or to VDD for ±1 V range; similarly for SENSEB on Channel B. An external 0.5–1 V reference applied to SENSEA/B sets a custom ±VSENSE range - no external resistors or op amps required.
What is the purpose of the CLKOUT pin on the LTC2281IUP#PBF?
The CLKOUT pin on the LTC2281IUP#PBF is a data-ready strobe derived from CLKB. Its falling edge aligns precisely with valid output data (DA0–DA9/DB0–DB9), eliminating setup/hold timing uncertainty in FPGA or ASIC interfaces. This enables reliable high-speed latch timing without external delay elements or PLL-based clock deskew.
Can the LTC2281IUP#PBF operate with different output supply voltages (OVDD)?
Yes, the LTC2281IUP#PBF supports OVDD from 0.5 V to 3.6 V, allowing direct interface to 1.8 V, 2.5 V, or 3.3 V logic families. VOH/VOL levels scale accordingly - e.g., at OVDD = 1.8 V, VOH ≥ 1.79 V and VOL ≤ 0.09 V - ensuring clean signal integrity without level-shifting circuitry.
LTC2281IUP#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2281IUP#PBF FAQ
1.How can I place an order for LTC2281IUP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2281IUP#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 LTC2281IUP#PBF reliable?
The price and inventory of LTC2281IUP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2281IUP#PBF is usually 5 days.
3.What payment methods are accepted for LTC2281IUP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2281IUP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2281IUP#PBF?
LTC2281IUP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2281IUP#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 LTC2281IUP#PBF?
For technical support, including LTC2281IUP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2281IUP#PBF requirements.
6.How does Aetrix verify that LTC2281IUP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2281IUP#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 LTC2281IUP#PBF meets industry standards.
7.What is the process for return or replacement of LTC2281IUP#PBF?
All LTC2281IUP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2281IUP#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 LTC2281IUP#PBF part is unused and in its original packaging.
Return procedure for LTC2281IUP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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