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Analog Devices Inc. LTC2254CUH#PBF
- Part No.:
- LTC2254CUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2254CUH#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,970
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Product details
Overview
LTC2254CUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 105 Msps low-power pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications and imaging systems. It operates from a single 3V supply (2.85V–3.4V), delivers 72.3 dB SNR and 84 dB SFDR at 70 MHz input, supports flexible ±0.5V to ±1V differential input range, and features integrated clock duty cycle stabilizer and shutdown/nap modes.
For engineers reviewing the LTC2254CUH#PBF datasheet, LTC2254CUH#PBF pinout, LTC2254CUH#PBF application, or LTC2254CUH#PBF equivalent, key selection considerations include its 105 Msps sampling rate, QFN-32 package with exposed thermal pad, 640 MHz full-power bandwidth, 1.3 LSBRMS transition noise, and compatibility with differential analog drive topologies using VCM bias and external reference configuration via SENSE pin.
Technical Context
The LTC2254CUH#PBF implements a six-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle pipeline latency and no missing codes over temperature. Its sample-and-hold uses 3.5 pF sampling capacitors with aperture jitter of 0.2 psRMS, enabling high-fidelity digitization up to Nyquist (52.5 MHz) and beyond via undersampling.
It supports dual output formats (offset binary or 2's complement) selected by MODE pin voltage, configurable input range via SENSE pin (±0.5V to ±1V), and independent OVDD supply (0.5V–3.6V) for interfacing with 1.8V/2.5V/3.3V logic. Clock input is single-ended with programmable duty cycle stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with guaranteed no missing codes across 0°C to 70°C operating range |
| Sampling Rate | 105 Msps - enables direct RF sampling of IF signals up to ~50 MHz with sufficient Nyquist margin |
| SNR @ 70 MHz | 72.3 dBFS - determines minimum detectable signal level in wideband receivers |
| SFDR @ 70 MHz | 84 dBc - defines spurious-free dynamic range for multi-tone communication signals |
| Power Dissipation | 320 mW typical at 105 Msps - allows thermal management in dense PCB layouts without forced air |
| Input Bandwidth | 640 MHz full-power - supports undersampling of L-band and S-band RF signals |
| INL / DNL | ±1 LSB / ±0.5 LSB typical - ensures linearity-critical applications like spectral analysis maintain amplitude fidelity |
Pinout & Package
Package: 32-lead (5 mm × 5 mm) plastic QFN with exposed thermal pad (Pin 33), RoHS-compliant, moisture sensitivity level 3. Exposed pad must be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN– | Differential analog input pair | Accepts ±0.5V to ±1V swing centered at 1.5V (VCM); requires matched 100Ω source impedance for optimal SFDR |
| REFH, REFL | ADC reference voltage terminals | Shorted pairs; require local 0.1 µF + 2.2 µF ceramic bypassing to GND for stable reference coupling |
| VDD (Pins 7, 32) | Analog supply | 3V ±0.15V supply; bypass each pin individually with 0.1 µF ceramic capacitor to GND |
| GND (Pin 8), GND (Pad 33) | Analog ground return | Separate internal ground plane connection; exposed pad must be soldered to system ground plane |
| CLK | Single-ended sampling clock input | Positive-edge triggered; supports duty cycle stabilization when MODE = 1/3 VDD or 2/3 VDD |
| SHDN, OE | Power mode control | SHDN=VDD + OE=GND → nap mode (15 mW); SHDN=VDD + OE=VDD → shutdown (2 mW) |
| D0–D13 | Parallel digital outputs | 14-bit MSB-first LVCMOS outputs; OVDD supplies output drivers independently (0.5V–3.6V) |
| SENSE | Input range and reference select | Voltage-programmable: 0.5V → ±0.5V range; VDD → ±1V range; external 0.5–1V → ±VSENSE range |
| VCM | 1.5V common-mode bias output | Provides precise 1.5V reference for transformer center-tap or op-amp driver bias; requires ≥2.2 µF bypass |
| OF | Over/underflow flag | Active-high open-drain output indicating saturation beyond full-scale input range |
Key Features
| Feature | Design Value |
|---|---|
| Flexible input range selection | Configurable ±0.5V to ±1V differential input via SENSE pin voltage, enabling optimization for signal chain dynamic range |
| Integrated clock duty cycle stabilizer | Compensates for non-50% clock duty cycles without external circuitry, preserving AC performance at full 105 Msps rate |
| Low 1.3 LSBRMS transition noise | Minimizes quantization uncertainty in time-domain measurements such as ultrasound pulse echo timing |
| Independent OVDD supply | Allows direct interface to 1.8V FPGA I/O banks or 3.3V microcontrollers without level shifters |
| 5-cycle deterministic pipeline latency | Enables precise timing alignment in closed-loop systems like digital predistortion feedback paths |
Applications
| Wireless Base Station Receivers | Medical Ultrasound Beamforming |
|---|---|
Use Scenario: Digitizing 20–40 MHz IF signals from quadrature downconverters in LTE/FDD-TDD base station transceivers. IC Role / Device Role / Timing Role: High-speed ADC front-end capturing complex baseband I/Q data with minimal harmonic distortion and jitter-induced noise floor degradation. Use Value: 84 dB SFDR at 70 MHz enables simultaneous reception of multiple adjacent channels without intermodulation masking. | Use Scenario: Sampling echo return signals from phased-array transducers operating at 2–15 MHz center frequencies. IC Role / Device Role / Timing Role: Precision digitizer in receive beamformer modules, where timing coherence across 64+ channels is critical. Use Value: 72.3 dB SNR and ±1 LSB INL preserve contrast resolution and tissue differentiation in B-mode imaging. |
| Spectral Monitoring Systems | Portable Test Equipment |
Use Scenario: Real-time spectrum analysis of 0–50 MHz RF emissions in EMI compliance testing and signal intelligence platforms. IC Role / Device Role / Timing Role: Wideband digitizer feeding FFT engines in embedded DSP subsystems requiring high spurious-free resolution. Use Value: 640 MHz full-power bandwidth supports first-Nyquist sampling of wide instantaneous bandwidths without aliasing filters. | Use Scenario: Core ADC in handheld oscilloscopes and vector signal analyzers targeting ≤50 MHz analog bandwidth. IC Role / Device Role / Timing Role: Low-power, thermally efficient digitizer enabling battery operation while maintaining >70 dB SNR performance. Use Value: 320 mW power consumption and QFN-32 package allow compact, fanless instrument designs with minimal thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9246BCPZ-105 | 14-bit, 105 Msps; requires dual 1.8V/3.3V supplies; no integrated clock stabilizer; 71.5 dB SNR @ 70 MHz | Higher layout complexity due to dual-supply routing; less tolerant of asymmetric clock duty cycles | Select when existing design already uses ADI's JESD204B ecosystem or requires lower voltage digital interface |
| LTC2252CUH#PBF | 12-bit, 105 Msps; same pinout and package; 310 mW power; 69.5 dB SNR @ 70 MHz | Lower resolution suitable for cost-sensitive comms where 12-bit ENOB suffices | Select when system SNR budget permits 2.8 dB lower SNR and reduced BOM cost is prioritized |
Compared with AD9246BCPZ-105, LTC2254CUH#PBF offers superior SNR and integrated clock conditioning but requires only one analog supply; compared with LTC2252CUH#PBF, it delivers 2 extra bits of resolution at modest power increase, making it optimal for precision spectral and medical imaging applications.
Availability
LTC2254CUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, spectral monitoring, and portable instrumentation requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC2254CUH#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 LTC2254CUH#PBF belongs to Linear Technology's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications receivers, medical imaging, and test equipment where AC performance, low power, and small footprint are essential.
FAQ
What is the operating temperature range for the LTC2254CUH#PBF?
The LTC2254CUH#PBF is specified for the commercial temperature range of 0°C to 70°C. This is indicated by the "C" grade suffix in the part number and confirmed in the Absolute Maximum Ratings table, where LTC2254C devices are explicitly rated for 0°C to 70°C operation. The device maintains full performance-including SNR, SFDR, and linearity-across this range.
Does the LTC2254CUH#PBF support single-ended analog input?
Yes, the LTC2254CUH#PBF supports single-ended analog input, though with degraded harmonic distortion and INL performance. Per the datasheet, AIN+ should be driven with the signal while AIN– is tied to 1.5V (VCM). SNR and DNL remain unchanged, but second- and third-harmonic distortion increases, making differential drive preferred for high-fidelity applications.
How is the input full-scale range configured on the LTC2254CUH#PBF?
The input full-scale range of the LTC2254CUH#PBF is configured via the SENSE pin voltage: connecting SENSE to VCM selects ±0.5V range; to VDD selects ±1V range; and applying an external 0.5V–1V voltage sets ±VSENSE. This is a hardware-programmed setting-not register-controlled-and directly scales the differential input span without changing reference voltages.
What is the purpose of the exposed thermal pad (Pin 33) on the LTC2254CUH#PBF?
The exposed thermal pad (Pin 33) on the LTC2254CUH#PBF serves as the primary analog ground return and thermal dissipation path. It must be soldered to a PCB ground plane to ensure proper electrical performance (reducing noise and improving PSRR) and thermal management (θJA = 34°C/W). Leaving it unconnected degrades SNR, increases junction temperature, and risks reliability failure.
Can the LTC2254CUH#PBF interface directly with a 1.8V FPGA I/O bank?
Yes, the LTC2254CUH#PBF can interface directly with a 1.8V FPGA I/O bank by setting OVDD = 1.8V. Its digital outputs are LVCMOS-compatible with rail-to-rail swing, and the datasheet specifies VOH = 1.79V and VOL = 0.09V at IO = –200µA / 1.6mA under OVDD = 1.8V-fully meeting 1.8V logic thresholds. No external level shifters are required.
LTC2254CUH#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 105M
- 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:
- 2.85V ~ 3.4V
- Voltage - Supply, Digital:
- 2.85V ~ 3.4V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2254CUH#PBF FAQ
1.How can I place an order for LTC2254CUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2254CUH#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 LTC2254CUH#PBF reliable?
The price and inventory of LTC2254CUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2254CUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC2254CUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2254CUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2254CUH#PBF?
LTC2254CUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2254CUH#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 LTC2254CUH#PBF?
For technical support, including LTC2254CUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2254CUH#PBF requirements.
6.How does Aetrix verify that LTC2254CUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2254CUH#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 LTC2254CUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC2254CUH#PBF?
All LTC2254CUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2254CUH#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 LTC2254CUH#PBF part is unused and in its original packaging.
Return procedure for LTC2254CUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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