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Analog Devices Inc. LTC2145IUP-14#PBF
- Part No.:
- LTC2145IUP-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2145IUP-14#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,846
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Product details
Overview
LTC2145IUP-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, dual-channel, simultaneously sampling analog-to-digital converter with 125Msps maximum sample rate, 73.1dB SNR, 90dB SFDR, and ultralow 0.08psRMS jitter-designed for high-dynamic-range IF digitization in cellular base stations and software-defined radios.
For engineers reviewing the LTC2145IUP-14#PBF datasheet, LTC2145IUP-14#PBF pinout, LTC2145IUP-14#PBF application, or LTC2145IUP-14#PBF equivalent, this page delivers verified electrical specs, package mapping, real-world use cases, and validated alternative options for RF receiver front-end design, multi-channel data acquisition, and portable medical imaging systems.
Technical Context
The LTC2145IUP-14#PBF implements two independent 14-bit ADC cores sharing a common clock domain, enabling true simultaneous sampling with ±1.5mV offset matching and ±0.2%FS gain matching across channels. Its 750MHz full-power bandwidth sample-and-hold supports undersampling of IF signals up to 140MHz.
Digital outputs support three configurable modes-full-rate CMOS, DDR CMOS, or DDR LVDS-with separate OVDD supply (1.1–1.9V) for level-shifting flexibility. An integrated SPI port enables runtime configuration of input range, output mode, randomizer, duty cycle stabilizer, and power modes (Nap/Sleep).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes over temperature-ensures monotonicity and guaranteed code coverage in precision measurement. |
| Max Sample Rate | 125Msps-supports Nyquist sampling of signals up to 62.5MHz or undersampling of higher IFs (e.g., 70MHz LTE carriers). |
| SNR @ 70MHz | 73.1dBFS-enables >12 effective bits at RF input frequencies critical for cellular and radar receivers. |
| SFDR @ 70MHz | 90dBc-suppresses harmonics sufficiently to resolve weak signals adjacent to strong interferers in dense spectral environments. |
| Total Power @ 125Msps | 189mW (CMOS mode)-low enough for thermally constrained portable SDRs and multi-channel DAQ systems without forced air cooling. |
| Input Bandwidth | 750MHz full-power-allows direct digitization of wideband IF signals without external amplification or filtering degradation. |
| Jitter (ENC) | 0.08psRMS differential encode-minimizes aperture uncertainty, preserving SNR when undersampling GHz-range carriers. |
Pinout & Package
64-pin (9mm × 9mm) plastic QFN package with exposed thermal pad (Pin 65 = GND), requiring soldering to PCB ground plane for thermal and EMI performance. Pin functions are identical across all digital output modes (CMOS/LVDS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1,16,17,64) | Analog supply input | 1.7–1.9V rail powering ADC cores and reference circuitry; requires local 0.1μF ceramic bypass per group. |
| AIN1+/AIN1– (4,5) | Channel 1 differential analog input | Accepts 1–2VP-P differential signal; biased by VCM1 (Pin 2) at VDD/2 for optimal dynamic range. |
| ENC+/ENC– (18,19) | Differential encode clock input | Triggers conversion on both edges; supports PECL/LVDS/TTL/CMOS; ENC– tied to GND enables single-ended mode. |
| PAR/SER (11) | Programming interface mode select | Ground = serial SPI control; VDD = parallel logic control-determines function of CS/SCK/SDI/SDO pins. |
| D1_0–D1_13 / D2_0–D2_13 (45–48,50–58,25–32) | Dual-channel parallel data outputs | 14-bit CMOS outputs per channel; pin assignment differs between full-rate and DDR modes-see datasheet Table 1. |
| OVDD (42) | Digital output supply | 1.1–1.9V adjustable swing for CMOS outputs; 1.8V required for LVDS mode-decouples output drive from analog supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling dual ADC | Eliminates inter-channel skew and phase mismatch-critical for I/Q demodulation and beamforming applications. |
| Selectable input range (1–2VP-P) | Configured via SENSE pin voltage (0.625–1.3V); enables optimal full-scale utilization across varying signal chain gains. |
| Optional data output randomizer | Reduces deterministic spectral spurs caused by periodic patterns-improves SFDR in repetitive waveform capture. |
| Integrated clock duty cycle stabilizer | Compensates for >40%–60% input clock duty cycle variation-maintains timing margin without external PLL cleanup. |
| Low-power Nap/Sleep modes | 16mW Nap and 1mW Sleep states-enables rapid wake-up for burst-mode operation in battery-powered instrumentation. |
Applications
| Cellular Base Station Receiver | Software Defined Radio (SDR) |
|---|---|
Use Scenario: Digitizing dual-path 70MHz LTE IF signals with 20MHz channel bandwidth in macrocell remote radio heads. IC Role / Device Role / Timing Role: Simultaneously sampled dual ADC providing matched I/Q data streams with <1ps inter-channel skew for coherent demodulation. Use Value: 90dB SFDR rejects adjacent-channel interference; 73.1dB SNR ensures >12 ENOB for 256-QAM decoding under low-SNR conditions. | Use Scenario: Reconfigurable wideband receiver in military/commercial SDR platforms supporting multiple waveforms (FM, AM, OFDM) from HF to 2GHz. IC Role / Device Role / Timing Role: High-fidelity IF sampling engine with programmable input range and output format-enabling flexible front-end architecture without hardware changes. Use Value: 750MHz input bandwidth allows direct sampling of L-band GPS/GNSS and UHF tactical comms; DDR LVDS outputs reduce FPGA pin count and EMI. |
| Portable Ultrasound Imaging | Multi-Channel Data Acquisition |
Use Scenario: Beamformed echo digitization in handheld ultrasound probes with 128+ transducer elements and real-time B-mode rendering. IC Role / Device Role / Timing Role: Dual-channel ADC capturing time-aligned RF echoes from adjacent transducer pairs-supporting synthetic aperture processing. Use Value: ±1.5mV offset matching and ±0.2%FS gain matching ensure consistent amplitude response across channels; low 189mW power enables battery operation. | Use Scenario: High-precision vibration monitoring in industrial predictive maintenance systems using 8–16 synchronized sensor inputs. IC Role / Device Role / Timing Role: Precision timing reference for distributed ADC synchronization-leveraging simultaneous sampling and low-jitter ENC inputs. Use Value: 0.08psRMS jitter minimizes time-domain smearing; SPI-configurable Nap mode reduces average power during idle sensing intervals. |
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 |
|---|---|---|---|
| AD9253BCPZ-125 | 12-bit, 125Msps, 69dB SNR, 85dB SFDR, 1.8V-only supply, no internal reference | Lower resolution and dynamic range; requires external reference and bias circuitry | Choose when cost sensitivity outweighs ENOB requirements and system already provides precision reference infrastructure. |
| LTC2268IUJ-14#PBF | 14-bit, 125Msps, 73.2dB SNR, 88dB SFDR, 1.8V analog/digital supply, no duty cycle stabilizer | Similar resolution but lower SFDR; lacks clock duty cycle correction and randomizer features | Choose when ultra-low harmonic distortion is less critical than minimizing external component count in compact layouts. |
Compared with AD9253BCPZ-125 and LTC2268IUJ-14#PBF, the LTC2145IUP-14#PBF delivers superior SFDR (90dB vs ≤88dB) and integrated features (duty cycle stabilizer, randomizer, internal reference) that reduce BOM count and improve robustness in RF-intensive environments.
Availability
LTC2145IUP-14#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio development, and portable medical imaging systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2145IUP-14#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 communications, industrial, automotive, and healthcare markets.
The LTC2145IUP-14#PBF belongs to ADI's high-speed precision ADC product line, engineered specifically for demanding RF receiver applications where simultaneous sampling, low jitter, and high SFDR are essential for spectral purity and signal fidelity.
FAQ
What is the operating temperature range for the LTC2145IUP-14#PBF?
The LTC2145IUP-14#PBF is rated for industrial temperature operation from –40°C to +85°C, as indicated by the "I" grade in the part number. This makes it suitable for outdoor base station equipment, ruggedized SDR platforms, and portable medical devices deployed in variable ambient conditions. The device maintains full AC and DC specifications-including 73.1dB SNR and ±1LSB INL-across this entire range.
Does the LTC2145IUP-14#PBF support differential analog inputs?
Yes, the LTC2145IUP-14#PBF supports fully differential analog inputs on both channels (AIN1± and AIN2±), with common-mode bias provided by VCM1 and VCM2 outputs. It accepts 1–2VP-P differential signals and achieves optimal performance with differential drive-delivering 73.1dB SNR and 90dB SFDR at 70MHz input frequency. Single-ended drive is also supported but degrades SNR by ~1.5dB.
How does the SENSE pin configure input range on the LTC2145IUP-14#PBF?
The SENSE pin on the LTC2145IUP-14#PBF sets the full-scale input range: grounding SENSE selects ±0.5V, connecting to VDD selects ±1V, and applying 0.625–1.3V selects ±0.8×VSENSE. This allows precise matching to downstream amplifier gains without external attenuators or level shifters-e.g., 0.9375V on SENSE yields ±0.75V range, ideal for interfacing with 1.5VP-P op-amp outputs.
Can the LTC2145IUP-14#PBF operate with LVDS outputs?
Yes, the LTC2145IUP-14#PBF supports DDR LVDS outputs with 100Ω differential termination, 247–454mV differential swing, and 1.125–1.375V common-mode voltage. LVDS mode requires OVDD = 1.7–1.9V and consumes more power (315mW typical at 125Msps) than CMOS modes-but offers lower EMI, better noise immunity, and reduced FPGA pin loading for high-density designs.
What power-saving modes does the LTC2145IUP-14#PBF offer?
The LTC2145IUP-14#PBF provides two low-power states: Nap mode (16mW) suspends ADC conversion while retaining register settings and reference bias, and Sleep mode (1mW) powers down all analog circuitry except wake-up logic. Both modes support sub-microsecond wake-up-enabling burst-mode acquisition in battery-powered test equipment and IoT edge sensors without sacrificing timing accuracy upon resumption.
LTC2145IUP-14#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
- Data Interface:
- LVDS - Parallel, 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:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2145IUP-14#PBF FAQ
1.How can I place an order for LTC2145IUP-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2145IUP-14#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 LTC2145IUP-14#PBF reliable?
The price and inventory of LTC2145IUP-14#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2145IUP-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2145IUP-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2145IUP-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2145IUP-14#PBF?
LTC2145IUP-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2145IUP-14#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 LTC2145IUP-14#PBF?
For technical support, including LTC2145IUP-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2145IUP-14#PBF requirements.
6.How does Aetrix verify that LTC2145IUP-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2145IUP-14#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 LTC2145IUP-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2145IUP-14#PBF?
All LTC2145IUP-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2145IUP-14#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 LTC2145IUP-14#PBF part is unused and in its original packaging.
Return procedure for LTC2145IUP-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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