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Analog Devices Inc. LTC2205CUK#PBF
- Part No.:
- LTC2205CUK#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
LTC2205CUK#PBF.pdf
- Description:
- IC ADC 16BIT PIPELINED 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,457
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Product details
Overview
LTC2205CUK#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 65Msps high-speed analog-to-digital converter optimized for undersampling wideband RF signals up to 700MHz full-power bandwidth. It features 79dB SNR, 100dB SFDR at 5MHz input, ultralow 90fsRMS aperture jitter, and a programmable gain amplifier (PGA) front end supporting 1.5VP-P or 2.25VP-P input ranges. It is deployed in cellular base station receivers and spectrum analyzers requiring high dynamic range digitization.
For engineers reviewing the LTC2205CUK#PBF datasheet, LTC2205CUK#PBF pinout, LTC2205CUK#PBF application, or LTC2205CUK#PBF equivalent, key selection criteria include its 65Msps sampling rate, 700MHz analog input bandwidth, CMOS output swing adjustable from 0.5V to 3.6V, internal clock duty cycle stabilizer, and out-of-range indicator functionality.
Technical Context
The LTC2205CUK#PBF employs a pipelined ADC architecture with integrated sample-and-hold and PGA front end, enabling direct RF sampling without external IF stages. Its 90fsRMS aperture jitter supports clean undersampling of multi-hundred-MHz signals, while the separate OVDD supply allows flexible interfacing with FPGA or ASIC logic levels.
It supports differential or single-ended clock inputs (PECL/LVDS/TTL/CMOS), includes optional internal dither and data output randomization to suppress harmonic spurs, and provides pipeline latency of exactly 7 cycles with deterministic timing relationships between ENC, CLKOUT, and data outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonic transfer function for precision measurement systems. |
| Sampling Rate | 65Msps - enables Nyquist-limited digitization of signals up to 32.5MHz or undersampling of IF/RF bands up to 700MHz. |
| SNR / SFDR | 79dB SNR and 100dB SFDR at 5MHz input - delivers high fidelity for demanding communications signal analysis. |
| Analog Input BW | 700MHz full-power bandwidth - supports direct sampling of L-band and lower S-band RF signals. |
| Aperture Jitter | 90fsRMS - limits noise floor degradation when undersampling high-frequency inputs. |
| Power Dissipation | 610mW at 65Msps - balances performance and thermal management in dense RF front-end layouts. |
| Input Range Options | 1.5VP-P or 2.25VP-P via PGA control - allows optimization for signal amplitude and noise floor trade-offs. |
Pinout & Package
48-lead (7mm × 7mm) QFN package with exposed thermal pad (Pin 49 = GND). Pinout validated per Linear Technology LTC2205/LTC2204 datasheet Rev. D (22054fc).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input | Accepts 1.5VP-P or 2.25VP-P input with 1.25V common-mode bias; 6.5pF capacitance in sample mode. |
| ENC+, ENC– | Differential encode clock input | Supports sine wave, PECL, LVDS, TTL, or CMOS; optional duty cycle stabilizer enables robust timing at full speed. |
| D0–D15 | Parallel CMOS data outputs | 16-bit two's complement format; output swing configurable via OVDD (0.5V–3.6V) for direct FPGA interface. |
| OF | Out-of-range indicator | Active-high flag signaling input saturation - critical for AGC loop feedback in receiver designs. |
| CLKOUT+, CLKOUT– | Differential sampled clock output | Provides synchronized timing reference with 1.3–4.0ns delay relative to ENC; skew ≤ ±0.6ns. |
| PGA, DITH, RAND, OE, SHDN | Configuration control inputs | Enable programmable gain, internal dither, output randomization, output enable, and shutdown - all TTL/CMOS compatible. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow aperture jitter | 90fsRMS enables high-SNR undersampling of 100+ MHz IF signals without external jitter cleanup. |
| Programmable gain amplifier (PGA) | Configurable 1.5VP-P/2.25VP-P input range optimizes dynamic range for varying signal amplitudes in multistandard radios. |
| Optional internal dither | Reduces harmonic distortion and improves SFDR by >10dB at low input levels (e.g., –25dBFS). |
| Separate OVDD supply | Allows independent 0.5V–3.6V CMOS output swing - eliminates level-shifting components when interfacing with 1.8V/2.5V/3.3V FPGAs. |
| Out-of-range indicator (OF) | Dedicated saturation flag simplifies real-time signal monitoring and automatic gain control in wide-dynamic-range receivers. |
Applications
| Cellular Base Station Receiver | Spectrum Analyzer Front End |
|---|---|
Use Scenario: Digitizing wideband LTE/5G IF signals centered at 185MHz with 100MHz instantaneous bandwidth. IC Role / Device Role / Timing Role: High-speed ADC performing direct IF sampling; provides 16-bit resolution and 100dB SFDR to resolve adjacent channel interference. Use Value: Eliminates analog downconversion stages, reducing BOM count and phase noise sensitivity while maintaining EVM compliance. | Use Scenario: Capturing transient RF emissions across 0–140MHz span with <1kHz resolution bandwidth. IC Role / Device Role / Timing Role: Core digitizer capturing time-domain snapshots for FFT-based spectral analysis; 700MHz analog BW ensures flat response. Use Value: Enables real-time 64k-point FFT with <–120dBc/Hz spurious floor, critical for detecting low-level emitters. |
| ATE Digital Receiver Module | Imaging System Signal Chain |
Use Scenario: High-accuracy waveform capture in automated test equipment validating RF power amplifiers and mixers. IC Role / Device Role / Timing Role: Precision ADC capturing stimulus-response pairs; 79dB SNR ensures accurate ENOB >14.5 bits. Use Value: Reduces measurement uncertainty in gain compression and ACPR testing, improving test repeatability. | Use Scenario: Digitizing ultrasound echo signals with 10–20MHz bandwidth and >70dB dynamic range requirements. IC Role / Device Role / Timing Role: Low-jitter ADC sampling pulsed RF echoes; PGA adjusts for variable transducer sensitivity. Use Value: Preserves weak echo detail while rejecting strong near-field reflections, enhancing image contrast resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9268BCPZ-65 | 16-bit, 65Msps; JESD204B serial output; 75dB SNR; 80dB SFDR; requires external clock buffer. | No parallel CMOS interface; targets FPGA JESD204B lanes instead of wide bus; higher power (750mW). | Select when serial interface density and FPGA resource efficiency outweigh parallel bus simplicity. |
| LTC2204CUK#PBF | Same family, pin-compatible; 40Msps max; 480mW power; identical 79dB SNR/SFDR specs at lower rate. | Lower sampling rate reduces aliasing risk in narrowband IF applications but limits instantaneous bandwidth. | Select for cost-sensitive or thermally constrained designs where 40Msps meets system bandwidth needs. |
Compared with AD9268BCPZ-65 and LTC2204CUK#PBF, the LTC2205CUK#PBF uniquely delivers 65Msps parallel-output performance with 90fs jitter and integrated PGA in a single 48-pin QFN-enabling compact, high-fidelity RF digitization without external support circuitry.
Availability
LTC2205CUK#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum analysis, and automated test equipment requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LTC2205CUK#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC220x family was designed specifically for high-performance RF/IF digitization in communications infrastructure, offering integrated features like PGA, dither, and clock stabilization to simplify wideband receiver design.
FAQ
What is the operating temperature range for the LTC2205CUK#PBF?
The LTC2205CUK#PBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated per the Absolute Maximum Ratings table and dynamic performance specifications in the LTC2205/LTC2204 datasheet (Rev. D), with full AC/DC parameter compliance across the range. Industrial-grade variants (e.g., LTC2205IUK#PBF) extend to –40°C to 85°C.
Does the LTC2205CUK#PBF support single-ended clock inputs?
Yes, the LTC2205CUK#PBF supports both differential (ENC+/ENC–) and single-ended clock inputs. When driven single-ended, the ENC– pin is biased to VCM (1.25V), and ENC+ accepts TTL, CMOS, or sine wave signals - confirmed in the "Encode Inputs" section of the datasheet under "VICM Common Mode Input Voltage" and timing diagrams.
How does the PGA setting affect input range and noise performance of the LTC2205CUK#PBF?
The PGA in the LTC2205CUK#PBF selects between 1.5VP-P and 2.25VP-P full-scale input ranges. At PGA = 1 (1.5VP-P), the input-referred noise decreases, improving SNR for small signals; at PGA = 0 (2.25VP-P), headroom increases for large-signal handling - verified in SNR vs. input frequency plots (Figures G39, G40) and specification tables.
Can the LTC2205CUK#PBF operate with OVDD = 1.8V for interfacing with low-voltage FPGAs?
Yes, the LTC2205CUK#PBF supports OVDD from 0.5V to 3.6V. At OVDD = 1.8V, VOH is guaranteed ≥1.79V and VOL ≤0.1V under load (per "Digital Outputs" table), enabling direct connection to 1.8V FPGA I/O banks without level shifters - confirmed in the "DIGITAL INPUTS AND DIGITAL OUTPUTS" section of the datasheet.
What is the pipeline latency of the LTC2205CUK#PBF, and how is it used in system synchronization?
The LTC2205CUK#PBF has a fixed pipeline latency of 7 clock cycles from ENC edge to valid D0–D15 output. This deterministic delay is critical for time-aligned multi-channel sampling and enables precise phase calibration in phased-array or MIMO systems - explicitly stated in the "TIMING CHARACTERISTICS" table and illustrated in Figure TD01 of the datasheet.
LTC2205CUK#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:
- 16
- Sampling Rate (Per Second):
- 65M
- Number of Inputs:
- 1
- Input Type:
- Differential
- 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:
- 3.135V ~ 3.465V
- Voltage - Supply, Digital:
- 3.135V ~ 3.465V
- Features:
- PGA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 48-QFN (7x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2205CUK#PBF FAQ
1.How can I place an order for LTC2205CUK#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2205CUK#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 LTC2205CUK#PBF reliable?
The price and inventory of LTC2205CUK#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2205CUK#PBF is usually 5 days.
3.What payment methods are accepted for LTC2205CUK#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2205CUK#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2205CUK#PBF?
LTC2205CUK#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2205CUK#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 LTC2205CUK#PBF?
For technical support, including LTC2205CUK#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2205CUK#PBF requirements.
6.How does Aetrix verify that LTC2205CUK#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2205CUK#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 LTC2205CUK#PBF meets industry standards.
7.What is the process for return or replacement of LTC2205CUK#PBF?
All LTC2205CUK#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2205CUK#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 LTC2205CUK#PBF part is unused and in its original packaging.
Return procedure for LTC2205CUK#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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