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Analog Devices Inc. DC854D-A
- Part No.:
- DC854D-A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC854D-A.pdf
- Description:
- EVAL BOARD FOR LTC2208
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Product details
Overview
LTC2208 from Analog Devices (acquired Linear Technology) is a 16-bit, 130Msps analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization up to 700MHz full-power bandwidth. It features a programmable gain amplifier (PGA) front end, 70fs RMS aperture jitter, 78dBFS noise floor, and 100dB spurious-free dynamic range (SFDR), enabling undersampling in cellular base station receivers and spectrum analyzers.
For engineers reviewing the LTC2208 datasheet, LTC2208 pinout, LTC2208 application, or LTC2208 equivalent, this page delivers verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative ADCs with documented functional trade-offs for RF receiver and ATE system design.
Technical Context
The LTC2208 employs a pipelined ADC core with integrated sample-and-hold and correction logic, supporting differential analog inputs (AIN+/AIN–) and flexible clocking via ENC+/ENC– with optional duty cycle stabilization. Its architecture enables direct RF sampling at input frequencies up to 700MHz while maintaining ±4LSB INL and ±1LSB DNL over temperature.
Digital output flexibility includes LVDS (standard or low-power), full-rate CMOS, or demultiplexed CMOS modes-configured via LVDS and MODE pins-with separate OVDD supply (0.5V–3.6V) allowing interface voltage scaling. Internal dither and output randomization (RAND pin) are available to suppress harmonic artifacts and digital coupling noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution & Sample Rate | 16-bit resolution at 130Msps-enables high-fidelity capture of wideband IF/RF signals without decimation loss. |
| Noise Floor | 78dBFS typical-supports detection of weak signals buried in noise, critical for spectrum analysis and radar receivers. |
| SFDR | 100dBc at 5MHz, >83dBc at 250MHz (1.5VP-P)-ensures clean digitization of multi-tone signals in dense spectral environments. |
| Aperture Jitter | 70fs RMS-limits SNR degradation at high input frequencies, enabling reliable undersampling up to 250MHz. |
| Input Bandwidth | 700MHz full-power bandwidth-allows direct sampling of L-band and S-band RF signals without external amplification. |
| Power Dissipation | 1.25W typical (CMOS mode)-balances performance and thermal management in dense PCB layouts. |
| Supply Voltage | Single 3.3V analog supply (VDD), with independent 0.5V–3.6V digital output supply (OVDD)-simplifies power rail design and supports mixed-voltage FPGA interfacing. |
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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input | Accepts 1.5VP-P or 2.25VP-P differential signal; common-mode voltage set by internal VCM (1.25V) or external bias. |
| ENC+, ENC– | Differential encode clock input | Sampling edge defined by ENC+ rising / ENC– falling; supports PECL, LVDS, TTL, CMOS, or sine wave drive. |
| LVDS (Pin 61) | Output mode select | Configures LVDS (VDD), low-power LVDS (2/3VDD), demux CMOS (1/3VDD), or full-rate CMOS (GND). |
| PGA (Pin 64) | Front-end gain control | Low = 1× gain (2.25VP-P input range); high = 1.5× gain (1.5VP-P input range)-optimizes SNR for varying signal levels. |
| D0–/D0+ to D15–/D15+ | LVDS data outputs | 16-bit parallel LVDS bus (MSB = D15); requires 100Ω differential termination at receiver for signal integrity. |
| CLKOUT+/CLKOUT– | LVDS data valid strobe | Edge-aligned with data; use rising CLKOUT+ or falling CLKOUT– to latch sampled data reliably. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Gain Amplifier (PGA) | Switches between 2.25VP-P and 1.5VP-P input ranges to maximize SNR across varying RF signal amplitudes. |
| Optional internal dither | Reduces harmonic distortion and improves SFDR by >10dB at –25dBFS input when enabled via DITH pin. |
| Digital output randomizer (RAND) | EXCLUSIVE-ORs LSB with all other bits to spread digital switching energy, minimizing EMI coupling into analog sections. |
| Clock duty cycle stabilizer | Enables high-performance sampling with non-50% clock duty cycles-critical when using PLL-based or divided clocks. |
| Flexible output interface | Four configurable output modes (LVDS standard/LP, full-rate/demux CMOS) simplify integration with diverse FPGA I/O standards. |
Applications
| Cellular Base Station Receiver | Spectrum Analyzer Front End |
|---|---|
Use Scenario: Digitizing 70MHz–250MHz IF signals from RF downconverters in macrocell and small-cell BTS. IC Role / Device Role / Timing Role: High-speed ADC capturing wide instantaneous bandwidth with minimal SFDR degradation under strong interferers. Use Value: 100dB SFDR at 5MHz and >83dB at 250MHz enables simultaneous detection of weak and strong channels in crowded LTE/5G bands. |
Use Scenario: Real-time FFT-based frequency domain analysis requiring low-noise, high-linearity digitization of swept or broadband inputs. IC Role / Device Role / Timing Role: Primary digitizer feeding FPGA-based signal processing pipeline with deterministic latency (7 cycles). Use Value: 78dBFS noise floor and 70fs jitter preserve dynamic range for detecting signals >100dB below carrier in narrow RBW measurements. |
| High-Speed ATE Test Instrumentation | Imaging System Data Acquisition |
Use Scenario: Automated test equipment capturing transient waveforms from DUTs with fast rise times and wide amplitude ranges. IC Role / Device Role / Timing Role: Precision ADC providing traceable, repeatable digitization for parametric testing and waveform validation. Use Value: ±4LSB INL and ±1LSB DNL ensure measurement accuracy across full scale; shutdown mode (SHDN) reduces power between tests. |
Use Scenario: Medical ultrasound or industrial X-ray systems digitizing echo return signals with microsecond timing precision. IC Role / Device Role / Timing Role: Time-of-flight ADC synchronizing with pulsed transducers and rejecting clock-induced jitter artifacts. Use Value: 70fs RMS aperture jitter minimizes time-domain uncertainty, improving axial resolution in echo-based imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9653BCPZ-125 | 16-bit, 125Msps; lower power (840mW); no PGA; 65dBFS SNR at 70MHz. | Better suited for portable or thermally constrained ATE; lacks input gain flexibility for variable-level RF signals. | Select when power budget is tighter than SFDR requirement and analog gain is handled externally. |
| LTC2207IUP | 16-bit, 105Msps; identical pinout and feature set; 95dB SFDR at 5MHz; 1.05W power. | Drop-in replacement for lower sample rate needs; same footprint and register compatibility simplifies redesign. | Choose when 105Msps suffices and reduced clock rate eases FPGA interface timing closure. |
Compared with AD9653BCPZ-125 and LTC2207IUP, the LTC2208 delivers higher sample rate (130Msps) and superior SFDR at RF frequencies-making it optimal for demanding communications and instrumentation where spectral purity and bandwidth are prioritized over power or cost.
Availability
LTC2208 is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum analysis, and high-speed ATE applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2208 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 LTC2208 belongs to ADI's high-speed precision ADC product line, engineered specifically for RF sampling, communications infrastructure, and test equipment where wide bandwidth, low jitter, and high SFDR are essential.
FAQ
What is the maximum analog input frequency supported by the LTC2208?
The LTC2208 supports a full-power analog input bandwidth of 700MHz, enabling direct RF sampling of signals in L-band and S-band without external amplification or filtering. This specification is validated under 3.3V supply and 130Msps operation with differential drive and proper PCB layout per the datasheet layout guidelines.
Does the LTC2208 require an external reference voltage?
No-the LTC2208 includes an internal 2.5V bandgap reference. The SENSE pin can be tied to VDD to enable it; alternatively, an external 2.5V or 1.25V reference may be applied to SENSE to set the same 2.25VP-P full-scale range (with PGA = 0). The LTC2208 does not require external reference circuitry for standard operation.
How does the PGA pin affect the LTC2208's input range and performance?
The PGA pin on the LTC2208 selects between two input ranges: low = 2.25VP-P (1× gain), high = 1.5VP-P (1.5× gain). This allows optimization of SNR for different signal amplitudes-higher gain improves small-signal resolution but reduces headroom for large transients. Performance metrics like SFDR and noise floor are specified for both settings.
Can the LTC2208 interface directly with a Xilinx Kintex-7 FPGA using LVDS?
Yes-the LTC2208 supports standard LVDS output mode (LVDS pin = VDD) with 247–454mV differential swing and 1.125–1.375V common-mode voltage, fully compliant with Xilinx Kintex-7 LVDS I/O standards. Proper 100Ω differential termination at the FPGA input is required, and the 7-cycle data latency must be accounted for in timing constraints.
What is the purpose of the RAND pin on the LTC2208?
The RAND pin enables digital output randomization: when asserted high, it XORs the LSB (D0) with all other data bits (D1–D15), spreading switching energy across frequency and reducing deterministic EMI coupling into sensitive analog sections. The data is fully recoverable by reapplying the same XOR operation at the receiver.
DC854D-A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 130M
- Data Interface:
- Parallel
- Input Range:
- 2.25Vpp
- Power (Typ) @ Conditions:
- 1.498W @ 130MSPS
- Utilized IC / Part:
- LTC2208
- Contents:
- Board(s)
DC854D-A FAQ
1.How can I place an order for DC854D-A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC854D-A 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 DC854D-A reliable?
The price and inventory of DC854D-A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC854D-A is usually 5 days.
3.What payment methods are accepted for DC854D-A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC854D-A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC854D-A?
DC854D-A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC854D-A 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 DC854D-A?
For technical support, including DC854D-A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC854D-A requirements.
6.How does Aetrix verify that DC854D-A is sourced from the original manufacturer or authorized distributors?
All DC854D-A 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 DC854D-A meets industry standards.
7.What is the process for return or replacement of DC854D-A?
All DC854D-A units undergo pre-shipment inspection (PSI). If there is an issue with DC854D-A, 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 DC854D-A part is unused and in its original packaging.
Return procedure for DC854D-A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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