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Analog Devices Inc. LTC2145IUP-12#PBF
- Part No.:
- LTC2145IUP-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2145IUP-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,316
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Product details
Overview
LTC2145IUP-12#PBF from Analog Devices (acquired Linear Technology) is a 12-bit, dual-channel, simultaneously sampling analog-to-digital converter with 125Msps maximum sample rate, 70.6dB SNR, 89dB SFDR, and ultralow 0.08psRMS jitter-designed for high-fidelity IF digitization in software-defined radios and cellular base stations.
For engineers reviewing the LTC2145IUP-12#PBF datasheet, LTC2145IUP-12#PBF pinout, LTC2145IUP-12#PBF application, or LTC2145IUP-12#PBF equivalent, key selection criteria include its 750MHz full-power bandwidth, selectable CMOS/DDR-CMOS/DDR-LVDS outputs, 1.8V single-supply operation, and –40°C to +85°C industrial temperature grade.
Technical Context
The LTC2145IUP-12#PBF implements two independent 12-bit ADC cores with simultaneous sampling architecture and integrated sample-and-hold amplifiers featuring 750MHz full-power bandwidth. Its differential encode interface accepts PECL/LVDS/TTL/CMOS clocks, and optional duty cycle stabilizer ensures timing integrity across wide input duty cycles.
Digital output flexibility includes full-rate CMOS, double-data-rate CMOS, or DDR LVDS modes, with separate OVDD supply enabling 1.2V–1.8V CMOS swing control. Internal reference provides 1.25V ±25ppm/°C VREF and programmable common-mode bias (VCM1/VCM2), while SPI port enables configuration of randomizer, nap/sleep modes, and output formats.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature-ensures monotonicity and guaranteed code coverage in precision measurement systems. |
| Max Sample Rate | 125Msps-supports Nyquist-sampled IF signals up to 62.5MHz or undersampling of higher-frequency RF bands. |
| SNR @ 70MHz | 70.6dBFS-enables >11.5 effective bits for high-dynamic-range signal capture in communications receivers. |
| SFDR @ 70MHz | 89dBFS-suppresses spurious content critical for multi-tone LTE/WCDMA signal analysis. |
| Total Power @ 125Msps | 183mW (CMOS mode)-low power enables dense channel count in portable medical imaging and multi-channel DAQ systems. |
| Input Bandwidth | 750MHz full-power bandwidth-allows direct sampling of L-band and S-band IF signals without external amplification. |
| Jitter (ENC) | 0.08psRMS-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). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1,16,17,64) | Analog supply input | 1.7V–1.9V analog rail; bypassing with 0.1μF ceramic capacitors per group is mandatory for noise-sensitive ADC performance. |
| AIN1+/AIN1– (4,5) | Differential analog input CH1 | Accepts 1VP-P to 2VP-P differential signal; common-mode biased by VCM1 (Pin 2) at ~0.9V. |
| ENC+/ENC– (18,19) | Differential clock input | Rising edge on ENC+ initiates conversion; ENC– tied to GND enables single-ended mode. |
| PAR/SER (11) | Programming mode select | Ground = serial SPI mode; VDD = parallel logic mode-determines function of CS/SCK/SDI pins. |
| D1_11–D1_0 / D2_11–D2_0 (47–48,50–58,27–32) | Parallel data outputs | 12-bit DDR CMOS or LVDS outputs per channel; pin mapping differs between output modes (see datasheet Table 1). |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling dual ADC | Guarantees matched gain/offset (<±0.2%FS gain, <±1.5mV offset) and timing (<1ps skew) between channels for coherent I/Q or phased-array applications. |
| Configurable digital outputs | Runtime-selectable CMOS/DDR-CMOS/DDR-LVDS interfaces enable interoperability with FPGAs (LVDS) or low-voltage ASICs (1.2V CMOS) without level-shifting. |
| Optional data randomizer | Reduces deterministic spectral tones in FFT-based processing-critical for compliance testing in spectrum analyzers and EMI receivers. |
| Low-power nap/sleep modes | 16mW nap mode and 1mW sleep mode allow dynamic power scaling during idle periods in battery-powered SDR or portable ultrasound systems. |
| Internal reference with SENSE pin | 1.25V ±25ppm/°C reference with external voltage trimming via SENSE pin (0.625V–1.3V) enables calibration for system-level accuracy. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing dual-path receive signals (I/Q) from RF front-end in macrocell BTS with 20MHz LTE bandwidth. IC Role / Device Role / Timing Role: Simultaneous sampling dual ADC providing synchronized 125Msps I/Q data streams with <1ps inter-channel skew for accurate complex baseband reconstruction. Use Value: 89dB SFDR prevents adjacent-channel interference masking weak signals; 70.6dB SNR supports 16-QAM demodulation at -1dBFS input. | Use Scenario: Reconfigurable IF receiver in military SATCOM terminal supporting multiple waveforms (TDOA, CDMA, OFDM) across 2–100MHz bands. IC Role / Device Role / Timing Role: High-jitter-performance ADC enabling undersampling of 70MHz IF with 0.08psRMS aperture jitter-preserving ENOB under wideband modulation. Use Value: 750MHz full-power bandwidth allows direct digitization without image-reject filtering; DDR-LVDS outputs interface directly to Xilinx Kintex FPGA fabric. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer capturing echo returns from 128 transducer elements with time-aligned sampling for synthetic aperture focusing. IC Role / Device Role / Timing Role: Dual-channel ADC operating in parallel programming mode with nap mode cycling to reduce average power in handheld probe electronics. Use Value: 183mW total power at 125Msps enables high frame rates within thermal limits; 12-bit resolution preserves tissue contrast in B-mode imaging. | Use Scenario: 32-channel vibration monitoring system for predictive maintenance on industrial turbines, requiring synchronized acquisition across all channels. IC Role / Device Role / Timing Role: One LTC2145IUP-12#PBF per 2-channel pair, with external clock distribution ensuring sub-picosecond inter-device skew via shared ENC+ source. Use Value: ±0.3LSB INL and ±0.1LSB DNL ensure amplitude fidelity for FFT-based fault signature analysis; –40°C to +85°C rating supports deployment in uncontrolled environments. |
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 |
|---|---|---|---|
| AD9233BCPZ-125 | 12-bit, 125Msps, single-channel; requires two devices for dual-channel operation; 69.5dB SNR, 86dB SFDR; 1.8V/3.3V dual supply. | No simultaneous sampling-inter-channel skew must be managed externally; lacks internal reference and SENSE calibration. | Select when board space permits discrete channel routing and external clock synchronization is acceptable. |
| ADS52J90IRGCT | 10-bit, 100Msps, 8-channel; 68.5dB SNR, 85dB SFDR; JESD204B serial interface; 1.8V/1.2V supplies. | Higher channel density but lower resolution and SNR; serial interface reduces PCB routing complexity but adds FPGA JESD204B IP overhead. | Select for compact multi-channel systems where 10-bit resolution suffices and FPGA resources support JESD204B decoding. |
Compared with AD9233BCPZ-125 and ADS52J90IRGCT, the LTC2145IUP-12#PBF uniquely delivers true simultaneous sampling, superior 70.6dB SNR, and integrated reference trimming-making it optimal for coherent dual-channel applications demanding phase-matched acquisition and minimal external components.
Availability
LTC2145IUP-12#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.
Supply support for LTC2145IUP-12#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 LTC2145 family was designed by Linear Technology (now ADI) specifically for high-dynamic-range, low-power, dual-channel digitization in communications and instrumentation-emphasizing simultaneous sampling integrity, jitter immunity, and flexible digital interfacing.
FAQ
What is the operating temperature range for the LTC2145IUP-12#PBF?
The LTC2145IUP-12#PBF is rated for industrial operation from –40°C to +85°C, as confirmed by the "I" grade designation in its part number and validated in the Absolute Maximum Ratings table. This range supports deployment in base station outdoor units, portable test equipment, and industrial DAQ enclosures without forced cooling.
Does the LTC2145IUP-12#PBF support both differential and single-ended analog inputs?
Yes, the LTC2145IUP-12#PBF supports fully differential analog inputs (AIN1+/AIN1–, AIN2+/AIN2–) with common-mode bias provided by VCM1/VCM2 pins. Single-ended drive is not recommended due to degraded CMRR (80dB typical) and SNR; the device requires differential signaling for specified AC performance including 70.6dB SNR.
How does the SENSE pin function on the LTC2145IUP-12#PBF?
The SENSE pin on the LTC2145IUP-12#PBF enables external trimming of the internal 1.25V reference voltage, accepting 0.625V–1.3V inputs to adjust VREF output across ±2.5% range. This allows system-level calibration to compensate for PCB trace resistance, temperature drift, or sensor nonlinearity-directly improving end-to-end measurement accuracy in precision DAQ applications.
Can the LTC2145IUP-12#PBF operate with a 1.2V OVDD supply for CMOS outputs?
Yes, the LTC2145IUP-12#PBF supports OVDD from 1.1V to 1.9V, including 1.2V. At 1.2V OVDD, CMOS outputs deliver VOH ≥1.185V and VOL ≤0.010V into 500μA load-enabling direct interface with 1.2V FPGA I/O banks without level shifters, reducing BOM cost and signal integrity risk in space-constrained designs.
What is the pipeline latency of the LTC2145IUP-12#PBF in DDR CMOS mode?
The LTC2145IUP-12#PBF exhibits 6.5 clock cycles of pipeline latency in DDR CMOS output mode, as specified in the Timing Characteristics table. This fixed latency enables deterministic timing alignment in FPGA-based digital downconverters and simplifies buffer management in real-time signal processing pipelines.
LTC2145IUP-12#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:
- 12
- 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-12#PBF FAQ
1.How can I place an order for LTC2145IUP-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2145IUP-12#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-12#PBF reliable?
The price and inventory of LTC2145IUP-12#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-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2145IUP-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2145IUP-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2145IUP-12#PBF?
LTC2145IUP-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2145IUP-12#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-12#PBF?
For technical support, including LTC2145IUP-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2145IUP-12#PBF requirements.
6.How does Aetrix verify that LTC2145IUP-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2145IUP-12#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-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2145IUP-12#PBF?
All LTC2145IUP-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2145IUP-12#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-12#PBF part is unused and in its original packaging.
Return procedure for LTC2145IUP-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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