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Analog Devices Inc. LTC2224CUK#PBF
- Part No.:
- LTC2224CUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2224CUK#PBF.pdf
- Description:
- IC ADC 12BIT PIPELINED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
LTC2224CUK#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 135Msps pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 67.3dB SNR at 140MHz input, 80dB SFDR up to 150MHz, and 775MHz full-power bandwidth with ultralow 0.15psRMS aperture jitter - enabling undersampling of IF signals in cable head-end and wireless baseband systems.
For engineers reviewing the LTC2224CUK#PBF datasheet, LTC2224CUK#PBF pinout, LTC2224CUK#PBF application, or LTC2224CUK#PBF equivalent, key selection criteria include its ±0.5V/±1V selectable input range, CMOS output swing (0.5V–3.6V), clock duty cycle stabilizer, shutdown/nap modes, and 48-pin 7mm × 7mm QFN package with exposed ground pad.
Technical Context
The LTC2224CUK#PBF implements a five-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle pipeline latency. Its sample-and-hold uses differential NMOS switch-capacitor topology with 1.6pF sampling capacitance and 15Ω on-resistance, supporting both differential and single-ended analog drive.
It features flexible reference control via SENSE and MODE pins, enabling ±0.5V or ±1V input ranges and selection between offset binary or 2's complement output formats. The ENC+/ENC– differential clock interface accepts PECL/LVDS/TTL/CMOS inputs, and optional duty cycle stabilization maintains performance across wide clock duty cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over 0°C to 70°C operating range |
| Sample Rate | 135Msps maximum - supports real-time digitization of wideband IF signals up to ~67.5MHz Nyquist zone |
| SNR @ 140MHz | 67.3dB (typ) - enables high-fidelity capture of 14-bit-equivalent dynamic range signals in broadband comms |
| SFDR @ 150MHz | 80dB (typ) - suppresses spurious content critical for adjacent-channel interference mitigation in LTE/WiMAX |
| Full Power BW | 775MHz - preserves amplitude accuracy for fast-rising RF transients and wideband modulation waveforms |
| Aperture Jitter | 0.15psRMS - limits sampling noise floor degradation to ≤0.5dB loss at 250MHz input frequency |
| Power Dissipation | 630mW (typ) at 3.3V VDD - balances high-speed performance with thermal manageability in dense PCB layouts |
| INL / DNL | ±0.4LSB / ±0.3LSB (typ) - ensures accurate amplitude linearity for closed-loop PA linearization feedback paths |
Pinout & Package
Package: 48-lead 7mm × 7mm plastic QFN with exposed thermal pad (Pin 49 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– (1, 2) | Differential analog input pair | Accepts ±0.5V or ±1V differential signal centered at 1.6V common mode; high-impedance CMOS input with 1.6pF sampling capacitance |
| ENC+, ENC– (16, 17) | Differential encode clock inputs | Sampled on opposite edges; support PECL/LVDS/TTL/CMOS; enable duty cycle stabilization when MODE pin configured |
| D0–D11 (21, 24, 25, 26, 29, 30, 31, 34, 35, 36, 39, 40) | CMOS digital outputs | 12-bit parallel data bus (D11 = MSB); output voltage swing programmable via OVDD (0.5V–3.6V) |
| SHDN, OE (18, 19) | Power management control | Enable three low-power states: normal (SHDN=0, OE=0), high-Z output (SHDN=0, OE=1), nap mode (SHDN=1, OE=0) |
| SENSE (43), MODE (42) | Configuration inputs | SENSE selects input range (VCM→±0.5V, VDD→±1V); MODE selects output format (offset binary/2's complement) and duty cycle stabilizer enable |
| VCM (44) | 1.6V reference output/input | Provides common-mode bias for external drivers or transformer center-tap; requires ≥2.2µF bypass to ground |
Key Features
| Feature | Design Value |
|---|---|
| Selectable input range | ±0.5V or ±1V differential via SENSE pin - simplifies front-end gain staging for varying signal chain dynamic ranges |
| Low power operation | 630mW at 135Msps, 2mW in shutdown, 35mW in nap mode - reduces thermal load and system-level cooling requirements |
| Data-ready timing | CLOCKOUT output provides synchronized latch edge with <0.6ns skew vs data - eliminates external timing alignment circuitry |
| Flexible clock interface | Differential ENC+/ENC– with optional duty cycle stabilizer - tolerates 30%–70% clock duty cycle without AC performance loss |
| Reference integration | Internal 1.6V bandgap reference with programmable gain - eliminates need for external precision reference ICs |
| Robust analog input | 775MHz full-power bandwidth and 80dB CMRR - maintains fidelity for wideband modulated signals with strong common-mode noise |
Applications
| Cable Head-End Digitization | Wireless Base Station IF Sampling |
|---|---|
Use Scenario: Digitizing multi-channel DOCSIS 3.1 upstream signals in cable modem termination systems (CMTS). IC Role / Device Role / Timing Role: High-speed ADC capturing 5–85MHz upstream spectrum with >65dB SNR to support 1024-QAM modulation. Use Value: Enables simultaneous processing of 32+ upstream channels per ADC due to 135Msps rate and low intermodulation distortion. |
Use Scenario: Undersampling 180–220MHz IF signals from LTE FDD/TDD radio receivers in macrocell base stations. IC Role / Device Role / Timing Role: Direct IF sampling ADC providing 12-bit resolution at Nyquist zone 2, eliminating analog IF filtering stages. Use Value: Reduces BOM count by removing image-reject mixers and IF SAW filters while maintaining 80dB SFDR for adjacent channel rejection. |
| Power Amplifier Linearization | Communications Test Equipment |
Use Scenario: Capturing feedback signals from GaN/GaAs PA output for digital predistortion (DPD) in 5G massive MIMO active antennas. IC Role / Device Role / Timing Role: Real-time acquisition of PA output envelope and phase error with sub-1LSB INL for adaptive DPD coefficient calculation. Use Value: Improves ACLR by ≥15dB through precise error vector magnitude (EVM) tracking enabled by 0.15psRMS jitter and 67.3dB SNR. |
Use Scenario: Signal acquisition stage in high-speed bit-error-rate testers (BERTs) and vector signal analyzers (VSAs) for 100G coherent optical modules. IC Role / Device Role / Timing Role: Front-end digitizer capturing 56Gbaud PAM4 waveforms with sufficient ENOB to validate transmitter compliance. Use Value: Supports >10-bit effective resolution at 70MHz input, meeting IEEE 802.3bs jitter tolerance requirements for optical receiver testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9230-125 | 12-bit, 125Msps; lower SFDR (75dB @ 140MHz); requires 1.8V/3.3V dual supply | Lower sampling rate limits Nyquist zone coverage; less suitable for 135Msps DOCSIS upstream capture | Choose when system clock budget restricts to ≤125Msps and cost sensitivity outweighs SFDR requirement |
| LTC2234CUK#PBF | 10-bit, 135Msps; higher SFDR (85dB @ 140MHz); identical pinout and package | Better spurious suppression but reduced dynamic range; trades resolution for cleaner spectral purity | Choose when SFDR dominates over ENOB in narrowband IF applications like radar pulse detection |
Compared with AD9230-125 and LTC2234CUK#PBF, the LTC2224CUK#PBF uniquely balances 12-bit resolution, 135Msps speed, and 80dB SFDR in a single 48-pin QFN - making it optimal for wideband communications where both amplitude fidelity and spectral purity are required simultaneously.
Availability
LTC2224CUK#PBF is available at Aetrix Electronics and suitable for cable head-end systems, wireless infrastructure equipment, and communications test instrumentation requiring stable component supply across extended production lifecycles.
Supply support for LTC2224CUK#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2224CUK#PBF belongs to ADI's high-speed data converter product line, designed specifically for demanding communications infrastructure applications requiring high dynamic range, low jitter, and robust IF sampling capability.
FAQ
What is the operating temperature range for the LTC2224CUK#PBF?
The LTC2224CUK#PBF is specified for commercial-grade operation from 0°C to +70°C ambient temperature. This is confirmed by the "C" suffix in the part number and explicitly stated in the Absolute Maximum Ratings table of the official datasheet. The device maintains full performance specifications-including SNR, SFDR, and INL-across this entire range without derating.
Does the LTC2224CUK#PBF support single-ended analog input?
Yes, the LTC2224CUK#PBF supports single-ended analog input: connect the signal to AIN+ and tie AIN– to the 1.6V VCM pin. However, this configuration degrades harmonic distortion and INL compared to differential drive, while preserving SNR and DNL. The datasheet confirms this behavior in the "Single-Ended Input" section on page 14.
How is the input range selected on the LTC2224CUK#PBF?
The LTC2224CUK#PBF input range is selected via the SENSE pin: connecting SENSE to VCM configures ±0.5V differential input range; connecting SENSE to VDD configures ±1V differential input range. An external voltage between 0.5V and 1V applied to SENSE sets ±VSENSE. This is documented in the "Reference Operation" section (page 15) and functional description (page 1).
What is the purpose of the CLOCKOUT signal on the LTC2224CUK#PBF?
The CLOCKOUT signal on the LTC2224CUK#PBF is a data-valid strobe synchronized to the internal pipeline timing. It asserts on the falling edge to indicate valid D0–D11 output data, with guaranteed skew of ±0.6ns relative to data transitions. This eliminates external timing alignment circuits and simplifies FPGA or ASIC interface design, as stated in the "Timing Characteristics" table (page 5).
Can the LTC2224CUK#PBF be used with a 2.5V OVDD supply?
Yes, the LTC2224CUK#PBF supports OVDD from 0.5V to 3.6V, including 2.5V. At OVDD = 2.5V, the datasheet specifies VOH ≥ 2.49V and VOL ≤ 0.09V under 200µA sink/source conditions (page 4), ensuring clean logic-level compatibility with 2.5V FPGA I/O banks. This flexibility allows direct interfacing without level shifters.
LTC2224CUK#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 48-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 135M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 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:
- 3.1V ~ 3.5V
- Voltage - Supply, Digital:
- 3.1V ~ 3.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2224CUK#PBF FAQ
1.How can I place an order for LTC2224CUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2224CUK#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 LTC2224CUK#PBF reliable?
The price and inventory of LTC2224CUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2224CUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC2224CUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2224CUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2224CUK#PBF?
LTC2224CUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2224CUK#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 LTC2224CUK#PBF?
For technical support, including LTC2224CUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2224CUK#PBF requirements.
6.How does Aetrix verify that LTC2224CUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2224CUK#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 LTC2224CUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC2224CUK#PBF?
All LTC2224CUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2224CUK#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 LTC2224CUK#PBF part is unused and in its original packaging.
Return procedure for LTC2224CUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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