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Analog Devices Inc. LTC2249CUH#PBF
- Part No.:
- LTC2249CUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2249CUH#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:423
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Product details
Overview
LTC2249CUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 80Msps low-power pipelined analog-to-digital converter operating from a single 3V supply. It delivers 73dB SNR and 90dB SFDR at 70MHz input frequency, features a 575MHz full-power bandwidth sample-and-hold, clock duty cycle stabilizer, and shutdown/nap modes. It is used in high-dynamic-range signal digitization for ultrasound imaging and broadband communications.
For engineers reviewing the LTC2249CUH#PBF datasheet, LTC2249CUH#PBF pinout, LTC2249CUH#PBF application, or LTC2249CUH#PBF equivalent, key selection criteria include AC performance at Nyquist-plus frequencies, flexible 1VP-P–2VP-P input range configuration via SENSE pin, differential analog input interface with VCM bias, and QFN-32 package thermal and layout compatibility.
Technical Context
The LTC2249CUH#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 4pF sampling capacitors with linearized charging glitch design and supports both differential and single-ended analog drive topologies.
It integrates a 1.5V bandgap reference with programmable input range (±0.5V or ±1V differential), configurable output format (offset binary or 2's complement), and independent OVDD supply (0.5V–3.6V) for logic-level flexibility. Clock input accepts CMOS/TTL or sinusoidal signals with optional duty cycle stabilization to maintain AC performance across wide duty cycle variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with guaranteed no missing codes over 0°C to 70°C operating range |
| Sample Rate | 80Msps maximum - defines real-time bandwidth limit of 40MHz (Nyquist) with usable aliasing-tolerant operation beyond |
| SNR @ 70MHz | 73dBFS - enables detection of signals 107.3× smaller than full scale in noise-limited RF/IF receivers |
| SFDR @ 70MHz | 90dBc - suppresses spurious tones to –90dB relative to fundamental, critical for spectral purity in comms systems |
| Power Dissipation | 222mW typical at 80Msps - allows thermal management in dense mixed-signal PCBs without forced air |
| Input Bandwidth | 575MHz full-power - supports direct RF sampling of L-band and lower S-band signals without external IF stage |
| INL / DNL | ±1LSB / ±0.5LSB typical - ensures linearity-critical applications like medical imaging maintain pixel fidelity |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = 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 pair | Accepts ±0.5V or ±1V differential swing centered at 1.5V (VCM); high common-mode rejection (80dB) minimizes noise coupling |
| REFH, REFL | ADC reference voltage terminals | Internally generated high/low reference rails; must be bypassed with 0.1µF + 2.2µF ceramics per pin pair for stability |
| VDD (Pins 7, 32) | Analog supply | Single 2.7V–3.4V rail powers core ADC and S/H; requires local 0.1µF ceramic decoupling |
| CLK | Sampling clock input | Positive-edge-triggered; supports duty cycle stabilizer (enabled via MODE pin) to relax clock source requirements |
| SHDN, OE | Power mode control | Combination selects Normal (outputs enabled), Nap (15mW), or Shutdown (2mW); enables dynamic power scaling |
| D0–D13 | Parallel digital outputs | 14-bit offset binary or 2's complement data bus; OVDD-supplied (0.5V–3.6V) for interfacing to FPGA/CPLD I/O banks |
| SENSE | Input range programming | Setting to VCM selects ±0.5V range; to VDD selects ±1V range; intermediate voltages enable custom ranges (e.g., ±0.75V) |
| VCM | 1.5V common-mode bias output | Provides precise DC level for transformer center-tap bias or op-amp driver reference; requires ≥2.2µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| Flexible input range selection | Configurable ±0.5V or ±1V differential full-scale via SENSE pin voltage - optimizes SNR/SFDR trade-off per system requirement |
| Integrated clock duty cycle stabilizer | Enables high AC performance with non-50% clock sources - eliminates need for external clock conditioners in space-constrained designs |
| Low aperture jitter (0.2ps RMS) | Minimizes sampling-time uncertainty - preserves SNR at high input frequencies (e.g., >70MHz) where jitter dominates noise floor |
| Independent output supply (OVDD) | Supports 0.5V–3.6V logic interface - allows direct connection to 1.8V, 2.5V, or 3.3V FPGA I/O without level shifters |
| Multiple low-power operating modes | Reduces power to 15mW (Nap) or 2mW (Shutdown) - extends battery life in portable instrumentation and enables rapid wake-up |
Applications
| Ultrasound Imaging | Wireless Base Station Receivers |
|---|---|
|
Use Scenario: Digitizing echo return signals from piezoelectric transducers in portable and cart-based ultrasound systems. IC Role / Device Role / Timing Role: High-speed ADC capturing 5–15MHz RF echoes with minimal harmonic distortion to preserve tissue contrast resolution. Use Value: 73dB SNR enables detection of low-amplitude deep-tissue reflections; 90dB SFDR prevents ghost artifacts from intermodulation in multi-channel beamforming. |
Use Scenario: Direct RF sampling of LTE/WCDMA receive bands (e.g., 1.8–2.2GHz downconverted to 70–140MHz IF). IC Role / Device Role / Timing Role: Wideband IF digitizer in zero-IF or low-IF receiver architectures requiring high spurious-free dynamic range. Use Value: 575MHz input bandwidth supports wide IF channels; 14-bit resolution maintains EVM compliance for 256-QAM modulation schemes. |
| Spectral Analysis Equipment | Portable Test & Measurement |
|
Use Scenario: Real-time spectrum analysis in handheld analyzers performing FFT-based signal monitoring up to 40MHz span. IC Role / Device Role / Timing Role: High-fidelity digitizer feeding FPGA-based FFT engines with deterministic 5-cycle latency for time-domain triggering. Use Value: No missing codes and ±1LSB INL ensure amplitude accuracy across full frequency sweep; low power enables battery operation. |
Use Scenario: Embedded digitization in field-deployable oscilloscopes, signal generators, and protocol analyzers. IC Role / Device Role / Timing Role: Core ADC in compact instruments requiring high SNR, low thermal footprint, and fast power-state transitions. Use Value: 222mW typical dissipation reduces heatsink requirements; QFN-32 package enables <1000mm² PCB area for handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC2248CUH#PBF | 14-bit, 65Msps; 20% lower sample rate; identical pinout and feature set | Better power efficiency (180mW) but reduced Nyquist bandwidth (32.5MHz) | Select when system bandwidth ≤32.5MHz and lower power or cost is prioritized over speed |
| AD9246BCPZ-80 | 14-bit, 80Msps; 72.5dB SNR @ 70MHz; 3.3V-only OVDD; no internal VCM or SENSE-based range control | Requires external common-mode bias and reference circuitry; higher board complexity | Select when existing design uses ADI ecosystem tools or when external reference precision outweighs integrated flexibility |
Compared with LTC2249CUH#PBF, LTC2248CUH#PBF trades speed for lower power and cost in bandwidth-constrained systems, while AD9246BCPZ-80 offers comparable speed but demands more external components for biasing and range setting-increasing BOM count and layout sensitivity.
Availability
LTC2249CUH#PBF is available at Aetrix Electronics and suitable for ultrasound imaging systems, wireless infrastructure receivers, portable test equipment, and spectral analysis instruments requiring stable component supply across extended production lifecycles.
Supply support for LTC2249CUH#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 LTC2249CUH#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding digitization tasks in communications, medical imaging, and instrumentation where wide bandwidth, low noise, and flexible interface are essential.
FAQ
What is the operating temperature range for the LTC2249CUH#PBF?
The LTC2249CUH#PBF is specified for commercial-grade operation from 0°C to 70°C. This is indicated by the "C" suffix in the part number and confirmed in the Absolute Maximum Ratings table. The device maintains full performance-including ±1LSB INL, 73dB SNR, and 90dB SFDR-across this entire range when operated within recommended supply and input conditions.
How does the SENSE pin configure the input range on the LTC2249CUH#PBF?
The SENSE pin on the LTC2249CUH#PBF sets the full-scale differential input range: tying SENSE to VCM selects ±0.5V (1VP-P), tying it to VDD selects ±1V (2VP-P). Intermediate voltages (e.g., 0.75V) yield proportional ranges like ±0.75V. This configuration directly scales the internal reference and affects both SNR (higher at 2VP-P) and SFDR (slightly better at 1VP-P).
Does the LTC2249CUH#PBF support single-ended analog input?
Yes, the LTC2249CUH#PBF supports single-ended input: drive AIN+ with the signal and tie AIN– to VCM (1.5V). However, this degrades harmonic distortion and INL versus differential drive, while preserving SNR and DNL. The datasheet explicitly states that SNR and DNL remain unchanged under single-ended operation, making it viable for cost-sensitive applications where linearity is less critical.
What is the purpose of the exposed thermal pad (Pin 33) on the LTC2249CUH#PBF?
The exposed pad (Pin 33) on the LTC2249CUH#PBF is internally connected to GND and serves dual thermal and electrical functions. It must be soldered to a PCB copper pour tied to system ground to achieve θJA = 34°C/W and prevent junction temperature exceedance. Omitting this connection risks thermal runaway and violates the absolute maximum rating for TJMAX = 125°C.
Can the LTC2249CUH#PBF operate with a 1.8V OVDD supply?
Yes, the LTC2249CUH#PBF supports OVDD from 0.5V to 3.6V, including 1.8V. At OVDD = 1.8V, the digital outputs meet VOH ≥ 1.79V and VOL ≤ 0.09V under load (IO = –200µA / 1.6mA), enabling direct interface to 1.8V FPGA or ASIC I/O banks without level translation. This is verified in the Digital Inputs and Outputs section of the datasheet.
LTC2249CUH#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):
- 80M
- 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:
- 2.7V ~ 3.4V
- Voltage - Supply, Digital:
- 2.7V ~ 3.4V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2249CUH#PBF FAQ
1.How can I place an order for LTC2249CUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2249CUH#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 LTC2249CUH#PBF reliable?
The price and inventory of LTC2249CUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2249CUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC2249CUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2249CUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2249CUH#PBF?
LTC2249CUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2249CUH#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 LTC2249CUH#PBF?
For technical support, including LTC2249CUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2249CUH#PBF requirements.
6.How does Aetrix verify that LTC2249CUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2249CUH#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 LTC2249CUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC2249CUH#PBF?
All LTC2249CUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2249CUH#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 LTC2249CUH#PBF part is unused and in its original packaging.
Return procedure for LTC2249CUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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