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Analog Devices Inc. LTC2145CUP-12#PBF
- Part No.:
- LTC2145CUP-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 64-WFQFN Exposed Pad
- Datasheet:
-
LTC2145CUP-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 64QFN
- Quantity:
- Payment:
- Shipping:
Inventory:153
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Product details
Overview
LTC2145CUP-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, dual-channel, simultaneously sampling analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications systems. It delivers 70.6dB SNR, 89dB SFDR, and ultralow 0.08psRMS aperture jitter at 125Msps sampling rate, operating from a single 1.8V supply with CMOS, DDR CMOS, or DDR LVDS output interfaces. It is deployed in cellular base stations and software-defined radios requiring precise IF undersampling.
For engineers reviewing the LTC2145CUP-12#PBF datasheet, LTC2145CUP-12#PBF pinout, LTC2145CUP-12#PBF application, or LTC2145CUP-12#PBF equivalent, key selection criteria include simultaneous dual-channel sampling integrity, 750MHz full-power bandwidth, selectable 1–2VP-P input range, low-power operation (183mW total), and SPI-configurable clock duty cycle stabilization and data randomization.
Technical Context
The LTC2145CUP-12#PBF integrates two matched 12-bit ADC cores sharing a common sample-and-hold with 750MHz full-power bandwidth and 0.3LSBRMS transition noise. Its differential encode interface accepts PECL, LVDS, TTL, or CMOS clocks, and optional duty cycle stabilizer ensures performance across non-50% clock duty cycles.
Digital outputs support three modes-full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS-with separate OVDD supply enabling 1.2–1.8V CMOS swing or 3.5mA/1.75mA LVDS current modes. Configuration is performed via a 4-wire SPI port supporting serial or parallel programming modes selected by the PAR/SER pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full code coverage in demanding measurement applications. |
| Sampling Rate | 125Msps - enables direct digitization of IF signals up to ~60MHz without aliasing in wideband receivers. |
| SNR / SFDR | 70.6dB / 89dB at 70MHz input - provides high-fidelity signal capture for multi-carrier cellular and radar waveforms. |
| Aperture Jitter | 0.08psRMS (differential encode) - minimizes sampling uncertainty, critical for undersampling >100MHz IFs with low noise floor. |
| Power Consumption | 183mW total at 125Msps (92mW per channel) - enables dense multi-channel data acquisition with thermal manageability. |
| Input Bandwidth | 750MHz full-power - supports wideband analog front-ends without external anti-alias filtering for many IF-sampling architectures. |
| Supply Voltage | Single 1.8V analog (VDD) + independent 1.2–1.8V digital output (OVDD) - simplifies power delivery and enables I/O voltage flexibility. |
Pinout & Package
64-lead (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 power supply | 1.7–1.9V supply for ADC core and reference; requires local 0.1μF ceramic bypassing. |
| AIN1+/AIN1– (4,5), AIN2+/AIN2– (12,13) | Differential analog inputs | Two fully independent 1–2VP-P input channels with 750MHz bandwidth and >80dB CMRR. |
| ENC+/ENC– (18,19) | Encode clock inputs | Differential or single-ended (ENC– tied to GND) sampling trigger; supports 0.08psRMS jitter performance. |
| PAR/SER (11) | Programming mode select | Hardwired to GND (serial SPI) or VDD (parallel logic control); not driven dynamically. |
| D1_11–D1_0, D2_11–D2_0 (47–48,58–65,27–32) | Digital data outputs | Configurable as CMOS (full/DDR) or DDR LVDS; output format and timing controlled via SPI registers. |
| CS/SCK/SDI/SDO (20–22,61) | SPI configuration interface | 4-wire serial port for real-time register access; SDO is open-drain requiring 2kΩ pull-up if used. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Guarantees phase-matched acquisition between channels for coherent beamforming and I/Q demodulation. |
| Optional data output randomizer | Reduces deterministic spectral spurs caused by periodic digital switching, improving SFDR in narrowband systems. |
| Configurable clock duty cycle stabilizer | Enables full-speed operation with clock sources having 30–70% duty cycle, relaxing clock generation requirements. |
| Shutdown and Nap modes | Reduces power to 1mW (Sleep) or 16mW (Nap) - preserves state while minimizing idle consumption in burst-mode systems. |
| Selectable input common-mode voltage | VCM1/VCM2 pins provide 0.7–1.25V programmable bias, simplifying interface to AC-coupled or DC-coupled front-ends. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing multiple RF receive paths in macrocell and small-cell LTE/5G base stations. IC Role / Device Role / Timing Role: Dual-channel ADC capturing synchronized I/Q samples at 125Msps for digital predistortion and MIMO processing. Use Value: 70.6dB SNR and 89dB SFDR enable high-order modulation (256-QAM) demodulation with low EVM in crowded spectrum. | Use Scenario: Reconfigurable wideband receiver in military/commercial SDR platforms supporting multiple waveform standards. IC Role / Device Role / Timing Role: Simultaneously sampled front-end ADC feeding FPGA-based digital downconverters with programmable decimation and filtering. Use Value: 750MHz input bandwidth and ultralow jitter allow direct undersampling of UHF/VHF bands without analog mixers or tuners. |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer digitizing echo return signals from phased-array transducers. IC Role / Device Role / Timing Role: High-fidelity dual ADC acquiring time-aligned RF echoes from adjacent transducer elements for synthetic aperture processing. Use Value: Matched gain/offset (<±0.2%FS/<±1.5mV) and low crosstalk (–110dBc) preserve spatial resolution and dynamic contrast in B-mode imaging. | Use Scenario: High-channel-count test equipment capturing transient waveforms across industrial sensors and power electronics. IC Role / Device Role / Timing Role: Precision dual ADC enabling interleaved or parallel acquisition across multiple sensor inputs with synchronized timestamps. Use Value: 12-bit resolution with no missing codes and ±0.3LSB INL ensures accurate amplitude measurement across full temperature range (0°C to 70°C). |
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; lacks simultaneous dual sampling and internal reference matching. | Requires external synchronization and calibration for dual-path use; higher system-level complexity. | Choose when single-channel density or lower cost outweighs need for intrinsic channel matching. |
| LTC2265IUJ-12#PBF | 12-bit, 105Msps, dual-channel; lower sampling rate and 69.5dB SNR; no DDR LVDS output option. | Less suitable for 125Msps IF sampling in 5G NR or wideband radar; limited output interface flexibility. | Choose for cost-sensitive, lower-bandwidth applications where 105Msps suffices and LVDS is unnecessary. |
Compared with AD9233BCPZ-125 and LTC2265IUJ-12#PBF, the LTC2145CUP-12#PBF uniquely combines true simultaneous dual-channel sampling, 125Msps rate, 70.6dB SNR, and configurable DDR LVDS outputs - making it optimal for coherent multi-antenna and wideband undersampling systems where channel matching and jitter performance are critical.
Availability
LTC2145CUP-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 and long-term production continuity.
Supply support for LTC2145CUP-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 industrial, automotive, communications, and healthcare markets.
The LTC2145 family was designed specifically for high-dynamic-range, multi-channel communications receivers - emphasizing simultaneous sampling accuracy, low jitter, and flexible digital interfacing to simplify wideband IF digitization in base stations and SDRs.
FAQ
What is the maximum sampling rate supported by the LTC2145CUP-12#PBF?
The LTC2145CUP-12#PBF supports a maximum sampling rate of 125Msps, as specified in its part number suffix "-12" and confirmed in the Absolute Maximum Ratings and Dynamic Accuracy sections of the official datasheet. This rate applies to both channels simultaneously, with guaranteed AC performance including 70.6dB SNR and 89dB SFDR at 70MHz input frequency under standard conditions (VDD = OVDD = 1.8V, differential encode, 2VP-P input range).
Does the LTC2145CUP-12#PBF include an internal voltage reference?
Yes, the LTC2145CUP-12#PBF includes an internal 1.25V reference (VREF) with ±25ppm/°C drift and 1.225–1.275V output tolerance at 0mA load. It also provides internal VCM outputs (VCM1/VCM2) nominally at VDD/2 (±25mV) for analog input biasing. External reference mode is supported via the SENSE pin, accepting 0.625–1.3V with ±3μA leakage.
What digital output interface options does the LTC2145CUP-12#PBF support?
The LTC2145CUP-12#PBF supports three digital output interface configurations: full-rate CMOS, double-data-rate (DDR) CMOS, and DDR LVDS. Output mode is selected via SPI registers or parallel control pins (SCK, CS). CMOS outputs operate with OVDD = 1.2–1.8V; DDR LVDS uses 100Ω on-chip termination and supports 1.75mA or 3.5mA current modes with defined VOD and VOS ranges.
How is channel matching characterized for the LTC2145CUP-12#PBF?
Channel matching for the LTC2145CUP-12#PBF is specified as ±0.2%FS gain matching and ±1.5mV offset matching across temperature. These values are measured between Channel 1 and Channel 2 under identical conditions and ensure minimal amplitude and timing skew in coherent dual-path applications such as I/Q demodulation and phased-array beamforming.
What power-saving modes are available on the LTC2145CUP-12#PBF?
The LTC2145CUP-12#PBF offers two low-power states: Nap mode (16mW total power) and Sleep mode (1mW total power). Both retain register settings and can be exited rapidly via ENC edge or SPI command. Nap mode maintains bias stability for faster wake-up; Sleep mode disables most circuitry except wake-up logic, ideal for extended idle periods in battery-powered or burst-mode systems.
LTC2145CUP-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 64-QFN (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2145CUP-12#PBF FAQ
1.How can I place an order for LTC2145CUP-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2145CUP-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 LTC2145CUP-12#PBF reliable?
The price and inventory of LTC2145CUP-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 LTC2145CUP-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2145CUP-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2145CUP-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2145CUP-12#PBF?
LTC2145CUP-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2145CUP-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 LTC2145CUP-12#PBF?
For technical support, including LTC2145CUP-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2145CUP-12#PBF requirements.
6.How does Aetrix verify that LTC2145CUP-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2145CUP-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 LTC2145CUP-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2145CUP-12#PBF?
All LTC2145CUP-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2145CUP-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 LTC2145CUP-12#PBF part is unused and in its original packaging.
Return procedure for LTC2145CUP-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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