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Analog Devices Inc. LTC2285IUP#PBF
- Part No.:
- LTC2285IUP#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2285IUP#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,503
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Product details
Overview
LTC2285IUP#PBF from Analog Devices (formerly Linear Technology) is a dual 14-bit, 125Msps low-power ADC operating from a single 3V supply, delivering 72.2dB SNR and 82dB SFDR at Nyquist for high-fidelity signal digitization in wideband communications and imaging systems. It features independent analog input channels (AINA±/AINB±), flexible ±0.5V to ±1V input range selection via SENSE pins, and integrated clock duty cycle stabilizer for robust timing.
For engineers reviewing the LTC2285IUP#PBF datasheet, LTC2285IUP#PBF pinout, LTC2285IUP#PBF application, or LTC2285IUP#PBF equivalent, key selection criteria include dual-channel 14-bit resolution at 125Msps, 640MHz full-power bandwidth, channel isolation of –110dB at 100MHz, and support for offset binary or 2's complement output formats with programmable MODE pin.
Technical Context
The LTC2285IUP#PBF implements a six-stage CMOS pipelined architecture with digital correction logic, achieving five-cycle pipeline latency and 1.3LSBRMS transition noise. Each channel operates independently with dedicated reference inputs (REFHA/REFLA, REFLB/REFHB), common-mode bias (VCMA/VCMB), and shutdown control (SHDNA/SHDNB).
It supports simultaneous or multiplexed dual-output operation via MUX pin, data-ready CLKOUT derived from CLKB, and overflow/underflow flag (OF). The clock duty cycle stabilizer enables high AC performance across wide input clock duty cycles without external conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full code coverage for precision measurement applications. |
| Sample Rate | 125Msps - enables real-time digitization of signals up to 62.5MHz Nyquist bandwidth per channel. |
| SNR @ 70MHz | 72.2dB - ensures high dynamic range for detecting weak signals amid strong interferers in spectral analysis. |
| SFDR @ 70MHz | 82dB - minimizes spurious content critical for multi-carrier wireless baseband processing. |
| Channel Isolation | –110dB at 100MHz - prevents crosstalk-induced distortion when digitizing independent high-frequency signals on A/B channels. |
| Power Dissipation | 790mW at 125Msps - balances performance and thermal management in compact, power-constrained systems like portable instrumentation. |
| Input Bandwidth | 640MHz full-power - supports direct RF sampling of L-band and lower microwave frequencies without external downconversion. |
Pinout & Package
Package: 64-lead (9mm × 9mm) plastic QFN with exposed pad (Pin 65 = GND), rated for –40°C to +85°C industrial temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AINA+, AINA– | Channel A differential analog input | Accepts ±0.5V to ±1V differential signal; requires matched 100Ω source impedance for optimal SFDR. |
| AINB+, AINB– | Channel B differential analog input | Independent second channel with identical specs; enables time-synchronized dual acquisition. |
| CLKA, CLKB | Channel A/B clock inputs | Single-ended positive-edge-triggered clocks; tie together for synchronous sampling. |
| DA0–DA13, DB0–DB13 | Digital output buses (14-bit MSB-first) | Parallel CMOS outputs with separate OVDD (0.5V–3.6V) for interfacing to FPGA/ASIC logic families. |
| CLKOUT | Data-ready output clock | Falling-edge-aligned strobe synchronized to CLKB; used to latch valid output data in external logic. |
| SHDNA, SHDNB | Per-channel shutdown control | Configures nap/sleep modes to reduce power to 15mW or 2mW per channel when inactive. |
| SENSEA, SENSEB | Input range programming pins | Select ±0.5V (tie to VCMA/VCMB), ±1V (tie to VDD), or custom range (external voltage 0.5–1V). |
| MODE | Output format & duty cycle stabilizer control | Configures offset binary/2's complement output and enables/disables internal clock conditioner. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 14-bit ADC cores | Enables simultaneous sampling of two analog signals-e.g., I/Q demodulation or stereo sensor inputs-without interleaving artifacts. |
| 640MHz full-power analog bandwidth | Supports direct sampling of IF signals up to L-band (1–2GHz) with minimal front-end filtering, reducing system component count. |
| Programmable input range (±0.5V to ±1V) | Allows optimization of dynamic range for varying signal amplitudes without external gain stages or attenuators. |
| Integrated clock duty cycle stabilizer | Eliminates need for external clock conditioning circuits, enabling reliable operation with non-50% duty cycle clocks from PLLs or dividers. |
| Per-channel shutdown and nap modes | Reduces power by >98% per channel during idle periods-critical for battery-powered portable instrumentation and radar pulse sequencing. |
Applications
| Wireless Baseband Processing | Medical Ultrasound Imaging |
|---|---|
Use Scenario: Digitizing I/Q baseband signals from zero-IF receivers in LTE/5G small cells and massive MIMO radios. IC Role / Device Role / Timing Role: Dual-channel ADC captures in-phase and quadrature components simultaneously with <1ps aperture jitter, preserving phase coherence. Use Value: 82dB SFDR suppresses adjacent-channel interference; 125Msps sample rate supports 100MHz instantaneous bandwidth per antenna element. | Use Scenario: High-speed beamforming in phased-array ultrasound systems requiring parallel echo signal acquisition from multiple transducer elements. IC Role / Device Role / Timing Role: Two independent ADCs digitize echo returns from paired transducer channels with matched gain/offset (<±0.3%FS, <±2mV) for coherent summation. Use Value: –110dB channel isolation prevents cross-talk between adjacent beam paths; 72.2dB SNR enables detection of low-amplitude tissue reflections. |
| Spectral Monitoring Equipment | Portable Test & Measurement |
Use Scenario: Real-time spectrum analyzers monitoring wide RF bands (e.g., 10MHz–1GHz) for EMI compliance and signal intelligence. IC Role / Device Role / Timing Role: ADC serves as front-end digitizer feeding FFT engines; CLKOUT synchronizes data capture to processing pipelines. Use Value: 640MHz analog bandwidth allows direct sampling without image-reject filters; 1.3LSBRMS transition noise ensures clean spectral lines. | Use Scenario: Handheld oscilloscopes and signal analyzers requiring high-resolution waveform capture in compact, battery-operated form factors. IC Role / Device Role / Timing Role: Dual ADC provides 2-channel scope functionality with hardware-triggered simultaneous acquisition and low-latency data streaming. Use Value: 790mW total power enables extended runtime; nap mode reduces idle consumption to 30mW for quick wake-up response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9250BCPZ-125 | 14-bit, 125Msps dual ADC with JESD204B serial interface; higher power (1.2W); no internal reference. | Requires external serializer and clocking IC; better suited for FPGA-based systems with high-speed serial backplanes. | Choose AD9250BCPZ-125 when JESD204B interface and deterministic latency are required over parallel CMOS outputs. |
| LTC2284IUP#PBF | 14-bit, 105Msps dual ADC in same 64-QFN package; 71.5dB SNR; lower power (650mW); identical pinout and feature set except reduced speed. | Used where 105Msps suffices-e.g., narrower bandwidth comms standards or cost-sensitive medical devices. | Choose LTC2284IUP#PBF for drop-in replacement where 125Msps is not required, offering lower power and thermal load. |
Compared with AD9250BCPZ-125, LTC2285IUP#PBF offers simpler parallel CMOS interfacing and integrated reference, while LTC2284IUP#PBF provides identical footprint and software compatibility at reduced speed and power-enabling scalable design reuse across product tiers.
Availability
LTC2285IUP#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical imaging, and portable test equipment requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and consistent parametric performance across production lots.
Supply support for LTC2285IUP#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 LTC2285IUP#PBF belongs to ADI's high-speed data converter product line, designed specifically for demanding wide-dynamic-range digitization in communications infrastructure, instrumentation, and imaging systems where AC performance and low power are critical.
FAQ
What is the operating temperature range for the LTC2285IUP#PBF?
The LTC2285IUP#PBF is specified for industrial operation from –40°C to +85°C, as indicated by the "I" grade in the part number. This rating is validated across all electrical parameters in the datasheet, including SNR, SFDR, and INL/DNL, ensuring reliability in harsh environments such as outdoor wireless base stations or portable diagnostic equipment where ambient temperatures fluctuate widely.
Does the LTC2285IUP#PBF require external reference components?
The LTC2285IUP#PBF includes an internal 1.5V reference buffer (VCM) and supports both internal and external reference configurations. When using the internal reference, external bypass capacitors (0.1μF + 2.2μF ceramic) are mandatory on REFHA/REFLA and REFLB/REFHB pins. An external reference can be applied directly to SENSEA/SENSEB for custom input ranges, but the internal reference remains active unless explicitly disabled via external circuitry.
How does the MODE pin affect the LTC2285IUP#PBF's output behavior?
The MODE pin on the LTC2285IUP#PBF controls two functions simultaneously: output data format (offset binary or 2's complement) and clock duty cycle stabilizer enable/disable. Ground selects offset binary with stabilizer off; 1/3 VDD selects offset binary with stabilizer on; 2/3 VDD selects 2's complement with stabilizer on; VDD selects 2's complement with stabilizer off. This dual function simplifies board layout by eliminating separate control lines.
Can the LTC2285IUP#PBF operate with only one channel active?
Yes, the LTC2285IUP#PBF supports independent per-channel shutdown via SHDNA/SHDNB pins. Setting SHDNA = VDD and OEA = VDD places Channel A in sleep mode (2mW), while Channel B remains fully operational. This capability allows dynamic power scaling in systems like multi-channel spectrum analyzers where only subset of channels process data at any given time-preserving timing alignment and minimizing inter-channel noise coupling.
What is the significance of the exposed pad (Pin 65) on the LTC2285IUP#PBF package?
The exposed pad (Pin 65) on the LTC2285IUP#PBF is electrically connected to GND and must be soldered to a solid ground plane on the PCB. It serves as the primary thermal path, contributing significantly to the device's θJA of 20°C/W. Proper thermal vias under the pad are essential to maintain junction temperature below 150°C under full-load conditions (790mW), especially in enclosed or convection-limited enclosures used in portable instrumentation.
LTC2285IUP#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:
- 14
- 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:
- -
LTC2285IUP#PBF FAQ
1.How can I place an order for LTC2285IUP#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2285IUP#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 LTC2285IUP#PBF reliable?
The price and inventory of LTC2285IUP#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2285IUP#PBF is usually 5 days.
3.What payment methods are accepted for LTC2285IUP#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2285IUP#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2285IUP#PBF?
LTC2285IUP#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2285IUP#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 LTC2285IUP#PBF?
For technical support, including LTC2285IUP#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2285IUP#PBF requirements.
6.How does Aetrix verify that LTC2285IUP#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2285IUP#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 LTC2285IUP#PBF meets industry standards.
7.What is the process for return or replacement of LTC2285IUP#PBF?
All LTC2285IUP#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2285IUP#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 LTC2285IUP#PBF part is unused and in its original packaging.
Return procedure for LTC2285IUP#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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