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Analog Devices Inc. LTC2261CUJ-12#PBF
- Part No.:
- LTC2261CUJ-12#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
LTC2261CUJ-12#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 40QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,461
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Product details
Overview
LTC2261CUJ-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 125Msps ultralow-power analog-to-digital converter with 70.8dB SNR and 85dB SFDR, designed for high-frequency signal digitization in communications infrastructure. It operates from a single 1.8V supply, supports CMOS/DDR CMOS/DDR LVDS outputs, and features 800MHz full-power bandwidth, optional clock duty cycle stabilizer, and SPI configuration interface.
For engineers reviewing the LTC2261CUJ-12#PBF datasheet, LTC2261CUJ-12#PBF pinout, LTC2261CUJ-12#PBF application, or LTC2261CUJ-12#PBF equivalent, key selection criteria include sampling rate (125Msps), SNR at IF frequencies, power dissipation (124mW), output interface flexibility, and thermal performance in 6mm × 6mm QFN packages for space-constrained RF front ends.
Technical Context
The LTC2261CUJ-12#PBF implements a 12-bit pipelined ADC architecture with sample-and-hold stage featuring 0.17psRMS jitter and 800MHz full-power bandwidth, enabling undersampling of IF signals up to 140MHz. Its correction logic ensures ±0.3LSB INL and ±0.1LSB DNL over temperature.
Digital outputs are configurable as full-rate CMOS, double-data-rate CMOS, or double-data-rate LVDS, with separate OVDD supply (1.2V–1.8V for CMOS; 1.7V–1.9V for LVDS) and on-chip 100Ω LVDS termination. The ENC+/ENC– differential clock input accepts sine, PECL, LVDS, TTL, or CMOS signals, and the optional duty cycle stabilizer maintains performance across wide input duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and full dynamic range utilization. |
| Sampling Rate | 125Msps - supports real-time digitization of wideband IF signals in SDR and base station receivers. |
| SNR | 70.8dB at 70MHz input - enables high-fidelity signal capture in demanding RF applications. |
| SFDR | 85dB at 70MHz input - suppresses harmonics and spurs critical for multi-carrier cellular systems. |
| Power Dissipation | 124mW at 125Msps with CMOS outputs - achieves ultralow power for thermally constrained portable or dense-array designs. |
| Input Bandwidth | 800MHz full-power - allows direct sampling of L-band and lower S-band signals without external amplification. |
| Jitter | 0.17psRMS aperture jitter - minimizes noise floor degradation when undersampling high-frequency inputs. |
Pinout & Package
40-lead (6mm × 6mm) plastic QFN package (UJ) with exposed thermal pad (Pin 41, GND). Requires soldering of exposed pad to PCB for thermal and electrical integrity. θJA = 32°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input | Accepts 1VP-P to 2VP-P input range; common-mode bias set by VCM (Pin 37). |
| ENC+, ENC– | Differential encode clock input | Triggers conversion on rising/falling edges; supports sine, LVDS, TTL, or CMOS drive. |
| VDD (Pins 9,10,40) | Analog supply | Single 1.8V rail powers core ADC; bypassed locally with 0.1µF ceramics. |
| OVDD (Pin 26) | Digital output supply | Configurable 1.2V–1.9V rail sets CMOS/LVDS output swing and current mode. |
| D0–D11 | Data outputs | 12-bit parallel outputs; pin mapping differs between full-rate CMOS, DDR CMOS, and DDR LVDS modes. |
| PAR/SER (Pin 8) | Programming mode select | Ground = serial SPI interface; VDD = parallel control of key functions (duty cycle stabilizer, output mode). |
| CS, SCK, SDI, SDO | SPI interface | Serial configuration port; SDO is open-drain requiring 2kΩ pull-up if used. |
| SENSE (Pin 39) | Reference programming | Selects input range: VDD → ±1V; GND → ±0.5V; external 0.625–1.3V → ±0.8×VSENSE. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow power operation | 124mW at 125Msps enables battery-powered or fanless RF instrumentation and portable medical imaging. |
| Flexible digital output interface | Hardware-selectable CMOS/DDR CMOS/DDR LVDS modes reduce system-level signal integrity complexity and PCB layer count. |
| Optional clock duty cycle stabilizer | Compensates for non-50% clock duty cycles without external circuitry, preserving timing margin in noisy clock distribution networks. |
| Low-noise sample-and-hold | 0.17psRMS jitter and 800MHz bandwidth support undersampling of 140MHz IF signals with minimal SNR degradation. |
| Configurable input range and reference | SENSE pin enables ±0.5V, ±1V, or user-defined ±0.8×VSENSE ranges - simplifies front-end gain staging across diverse signal sources. |
Applications
| Cellular Base Stations | Software Defined Radios |
|---|---|
Use Scenario: Digitizing 70–140MHz IF signals from multi-carrier transceivers in LTE/5G macrocells. IC Role / Device Role / Timing Role: High-speed ADC front end providing 125Msps sampling with 85dB SFDR to resolve adjacent channel interference. Use Value: Enables single-chip digitization of wide instantaneous bandwidths without analog downconversion, reducing BOM and calibration overhead. | Use Scenario: Reconfigurable RF receiver in military or test equipment supporting multiple waveforms and bandwidths. IC Role / Device Role / Timing Role: Programmable ADC with SPI-controlled modes (output format, clock stabilization, power states) for adaptive signal chain tuning. Use Value: Reduces FPGA I/O count and routing complexity via DDR LVDS outputs while maintaining low latency (5.5-cycle pipeline). |
| Portable Medical Imaging | Multi-Channel Data Acquisition |
Use Scenario: Ultrasound beamformer digitizing echo returns from phased arrays with low power and high SNR. IC Role / Device Role / Timing Role: Low-jitter, low-power ADC capturing 10–20MHz bandwidth signals with 70.8dB SNR for improved image contrast resolution. Use Value: Extends battery life via 124mW dissipation and eliminates need for external clock cleanup circuits. | Use Scenario: Simultaneous sampling of multiple sensor channels in industrial vibration monitoring or seismic sensing. IC Role / Device Role / Timing Role: Precision ADC with ±0.3LSB INL and shutdown/nap modes for synchronized, low-noise acquisition across distributed nodes. Use Value: Ensures measurement consistency across channels while minimizing thermal drift and system-level power consumption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9226BCPZ-65 | 12-bit, 65Msps; 73.5dB SNR; 3.3V supply; parallel CMOS only; no SPI config or duty cycle stabilizer. | Lower speed and fixed interface limit use in modern SDR or dense base station architectures. | Select when cost sensitivity outweighs speed/power trade-offs and system clocking is stable. |
| LTC2262CUJ-12#PBF | 12-bit, 105Msps; identical pinout, package, and feature set except reduced max sampling rate and lower power (103mW). | Direct drop-in replacement where 105Msps suffices - e.g., legacy IF sampling or lower-bandwidth medical systems. | Choose for design reuse and guaranteed compatibility when full 125Msps is not required. |
Compared with AD9226BCPZ-65, LTC2261CUJ-12#PBF delivers +60Msps speed, -1.5V supply reduction, and flexible output modes; versus LTC2262CUJ-12#PBF, it provides +20Msps headroom and higher dynamic range at modest power increase - making it optimal for next-generation wideband receivers.
Availability
LTC2261CUJ-12#PBF is available at Aetrix Electronics and suitable for cellular base stations, software defined radios, and portable medical imaging requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2261CUJ-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 LTC2261CUJ-12#PBF belongs to ADI's high-speed precision ADC product line, engineered for RF and IF digitization in communications infrastructure where low jitter, high SFDR, and ultralow power are critical.
FAQ
What is the maximum sampling rate supported by the LTC2261CUJ-12#PBF?
The LTC2261CUJ-12#PBF supports a maximum sampling rate of 125Msps, as confirmed in the Absolute Maximum Ratings and Converter Characteristics tables. This rate is specified under recommended operating conditions (VDD = OVDD = 1.8V, differential ENC+/ENC– = 2VP-P sine wave, 2VP-P input range). Performance metrics including SNR and SFDR are characterized at this speed.
Does the LTC2261CUJ-12#PBF support both internal and external voltage references?
Yes, the LTC2261CUJ-12#PBF supports both internal and external references via the SENSE pin (Pin 39). Connecting SENSE to VDD selects the internal 1.25V reference with ±1V input range; connecting to GND selects ±0.5V range; applying 0.625V–1.3V externally sets ±0.8×VSENSE range. Internal reference specs include ±25ppm/°C drift and 1.225–1.275V output.
What digital output interfaces does the LTC2261CUJ-12#PBF support?
The LTC2261CUJ-12#PBF supports three digital output configurations: full-rate CMOS, double-data-rate CMOS, and double-data-rate LVDS. Output mode is selected via PAR/SER (Pin 8) and SCK (Pin 14) in parallel programming mode. LVDS mode includes on-chip 100Ω termination and supports 1.75mA or 3.5mA current modes with differential output voltage of 247–454mV.
How is the clock input handled on the LTC2261CUJ-12#PBF?
The LTC2261CUJ-12#PBF accepts differential clock inputs on ENC+ (Pin 11) and ENC– (Pin 12), supporting sine, PECL, LVDS, TTL, or CMOS signals. An optional clock duty cycle stabilizer (enabled via CS pin) compensates for non-50% duty cycles. Jitter is specified at 0.17psRMS, enabling high-fidelity undersampling of IF signals up to 140MHz.
What power-saving modes are available on the LTC2261CUJ-12#PBF?
The LTC2261CUJ-12#PBF offers Shutdown and Nap modes. Shutdown mode reduces power to 0.5mW, while Nap mode draws 9mW - both significantly lower than the 124mW active power. These modes are controlled via SDI (Pin 15) in parallel programming mode and preserve register settings, allowing rapid wake-up without reconfiguration.
LTC2261CUJ-12#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125M
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- LVDS - Parallel, Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.7V ~ 1.9V
- Voltage - Supply, Digital:
- 1.7V ~ 1.9V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 40-QFN (6x6)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2261CUJ-12#PBF FAQ
1.How can I place an order for LTC2261CUJ-12#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2261CUJ-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 LTC2261CUJ-12#PBF reliable?
The price and inventory of LTC2261CUJ-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 LTC2261CUJ-12#PBF is usually 5 days.
3.What payment methods are accepted for LTC2261CUJ-12#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2261CUJ-12#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2261CUJ-12#PBF?
LTC2261CUJ-12#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2261CUJ-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 LTC2261CUJ-12#PBF?
For technical support, including LTC2261CUJ-12#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2261CUJ-12#PBF requirements.
6.How does Aetrix verify that LTC2261CUJ-12#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2261CUJ-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 LTC2261CUJ-12#PBF meets industry standards.
7.What is the process for return or replacement of LTC2261CUJ-12#PBF?
All LTC2261CUJ-12#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2261CUJ-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 LTC2261CUJ-12#PBF part is unused and in its original packaging.
Return procedure for LTC2261CUJ-12#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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