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Analog Devices Inc. LTC2245IUH#PBF
- Part No.:
- LTC2245IUH#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2245IUH#PBF.pdf
- Description:
- IC ADC 14BIT PIPELINED 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:593
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Product details
Overview
LTC2245IUH#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 10Msps pipelined analog-to-digital converter operating from a single 3V supply (2.7V–3.4V), delivering 74.4dB SNR and 90dB SFDR at 5MHz input for high-fidelity signal digitization in imaging and broadband communications systems.
For engineers reviewing the LTC2245IUH#PBF datasheet, LTC2245IUH#PBF pinout, LTC2245IUH#PBF application, or LTC2245IUH#PBF equivalent, key selection criteria include its 32-pin QFN package, ±1LSB INL (typ), clock duty cycle stabilizer support, flexible 1VP-P to 2VP-P input range, and low 60mW power consumption at full sample rate.
Technical Context
The LTC2245IUH#PBF implements a six-stage CMOS pipelined ADC architecture with 5-cycle latency, enabling precise time-domain sampling of wideband signals up to 575MHz full-power bandwidth. Its internal 1.5V bandgap reference supports programmable input ranges via the SENSE pin, while the MODE pin selects between offset binary or 2's complement output formats and enables/disables the clock duty cycle stabilizer.
Operation requires differential analog input drive for optimal AC performance, with AIN+ and AIN− referenced to VCM (1.5V). Digital outputs are parallel, 14-bit (D0–D13), with separate OVDD (0.5V–3.6V) and OGND pins to interface with diverse logic families, and dedicated OF (overflow) and SHDN/OE control pins for system-level power management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit, no missing codes over temperature - guarantees monotonicity and full code coverage in precision measurement applications. |
| Sample Rate | 10Msps maximum - supports Nyquist-limited baseband capture up to 5MHz with sufficient margin for anti-alias filtering. |
| SNR | 74.4dB (typ) at 5MHz input - enables >12-bit effective resolution for dynamic signal analysis in spectral or imaging systems. |
| SFDR | 90dB (typ) at 5MHz input - suppresses spurious content critical for multi-tone communication receiver front-ends. |
| Power Dissipation | 60mW (typ) at 10Msps - allows thermal integration in space-constrained portable instrumentation without forced cooling. |
| Input Range | Programmable 1VP-P to 2VP-P differential - matches common RF/IF signal levels while preserving SNR/SFDR trade-offs per application need. |
| INL / DNL | ±1LSB (typ) / ±0.5LSB (typ) - ensures accurate amplitude fidelity in medical imaging or test equipment digitizers. |
Pinout & Package
Package: 32-lead (5mm × 5mm) plastic QFN with exposed pad (GND, Pin 33), requiring soldering to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN+, AIN− | Differential analog input | Accepts ±0.5V to ±1V differential signal centered at VCM (1.5V); mismatched source impedance degrades even-order harmonics. |
| REFH, REFL | Reference voltage terminals | Must be shorted in pairs and bypassed locally with 0.1µF + 2.2µF ceramics to stabilize internal reference buffer and minimize noise coupling. |
| VDD (Pins 7, 32) | Analog supply | 3V nominal (2.7V–3.4V); requires local 0.1µF ceramic bypass to GND for analog rail stability. |
| CLK | Sampling clock input | Single-ended CMOS/TTL-compatible; rising edge triggers sampling; duty cycle stabilizer active when MODE = 1/3VDD or 2/3VDD. |
| SHDN, OE | Power mode control | SHDN=H/OE=H → shutdown (2mW); SHDN=H/OE=L → nap mode (15mW); both=L → normal operation with output enabled. |
| D0–D13 | Parallel digital outputs | 14-bit MSB-first (D13 = MSB); output voltage swing referenced to OVDD (0.5V–3.6V); load capacitance ≤10pF recommended for full-speed timing. |
| MODE | Output format & stabilizer select | GND → offset binary, stabilizer off; 1/3VDD → offset binary, stabilizer on; 2/3VDD → 2's complement, stabilizer on; VDD → 2's complement, stabilizer off. |
| SENSE | Input range programming | Tie to VDD → ±1V range; tie to VCM → ±0.5V range; external voltage 0.5V–1V → ±VSENSE range; bypass with 1µF ceramic if driven externally. |
| VCM | Common-mode bias output | 1.5V ±25ppm/°C; supplies DC bias for differential drivers or transformer center taps; requires ≥2.2µF ceramic bypass to GND. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible input range selection | Hardware-programmable 1VP-P or 2VP-P differential input via SENSE pin, enabling optimization of SNR vs. SFDR per signal chain requirement. |
| Integrated clock duty cycle stabilizer | On-chip PLL-based circuit accepts non-50% input clock duty cycles (e.g., from FPGA or microcontroller) and generates internal 50% clock for consistent aperture jitter performance. |
| Low-noise 1.5V internal reference | Bandgap-derived reference with ±30ppm/°C drift (internal) or ±5ppm/°C (external), supporting stable full-scale accuracy across industrial temperature range (–40°C to +85°C). |
| Multi-mode power management | Three operational states-normal, nap (15mW), and shutdown (2mW)-allow dynamic power scaling in battery-powered portable instrumentation or burst-mode acquisition systems. |
| High-fidelity pipeline architecture | Six-stage pipelined core with 5-cycle latency and <1LSBRMS transition noise delivers deterministic timing and minimal code-dependent distortion in real-time processing loops. |
Applications
| Wireless Base Station Receivers | Medical Ultrasound Imaging |
|---|---|
Use Scenario: Digitizing IF signals from quadrature downconverters in LTE/FDD-TDD infrastructure radios operating at 70MHz input frequency. IC Role / Device Role / Timing Role: High-linearity ADC front-end capturing 14-bit samples at 10Msps to preserve adjacent channel power ratio (ACPR) and EVM in multi-carrier transmission. Use Value: 90dB SFDR at 70MHz prevents intermodulation distortion from masking weak adjacent channels, directly improving receiver sensitivity and spectral efficiency. | Use Scenario: Sampling echo return signals from piezoelectric transducers in portable ultrasound machines with real-time beamforming requirements. IC Role / Device Role / Timing Role: Low-latency (5-cycle) digitizer feeding FPGA-based digital beamformer, synchronized to pulsed transmit bursts with precise timing control. Use Value: 74.4dB SNR enables detection of low-amplitude tissue reflections, while ±1LSB INL ensures accurate B-mode grayscale rendering without pixel-level artifacts. |
| Spectral Analysis Instruments | Portable RF Test Equipment |
Use Scenario: Capturing wideband spectrum snapshots in handheld spectrum analyzers performing real-time FFT-based signal monitoring from 1MHz to 50MHz. IC Role / Device Role / Timing Role: High-dynamic-range ADC core converting analog IF output from superheterodyne front-end into time-domain samples for 8192-point FFT computation. Use Value: No missing codes and 72.3dB SNR (min) across temperature ensure reliable amplitude calibration and traceable dBm measurements without code dropout errors. | Use Scenario: Embedded digitization in battery-operated RF field strength meters used for EMC pre-compliance testing in industrial environments. IC Role / Device Role / Timing Role: Low-power ADC subsystem operating from single 3V Li-ion cell, entering nap mode between measurement intervals to extend runtime. Use Value: 60mW active power and 15mW nap mode reduce thermal load and enable continuous 8-hour operation without fan or heatsink, meeting IP54 enclosure constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS5273IPFP | 14-bit, 40Msps, 1.8V supply, LVDS outputs, no internal reference - requires external reference and level-shifting for 3V logic interfacing. | Better suited for higher sample-rate systems where oversampling improves noise floor; not drop-in due to different supply voltage and interface. | Select ADS5273IPFP only when migrating to 40Msps+ architectures with LVDS serialization and existing 1.8V infrastructure. |
| LTC2246IUH#PBF | 14-bit, 25Msps, identical 32-pin QFN package, same pinout and reference architecture - shares layout compatibility but draws higher current (100mW). | Enables upgrade path for systems requiring higher Nyquist bandwidth (>12.5MHz) while retaining same PCB footprint and firmware register map. | Choose LTC2246IUH#PBF when future-proofing for higher-frequency signal capture without board redesign, accepting increased power budget. |
Compared with ADS5273IPFP and LTC2246IUH#PBF, the LTC2245IUH#PBF provides optimal balance of ultra-low power (60mW), proven 10Msps stability, and integrated reference flexibility - making it ideal for cost-sensitive, thermally constrained, or battery-powered instrumentation where 10Msps suffices.
Availability
LTC2245IUH#PBF is available at Aetrix Electronics and suitable for wireless infrastructure receivers, portable ultrasound systems, handheld spectrum analyzers, and battery-powered RF test equipment requiring stable component supply across industrial temperature grades.
Supply support for LTC2245IUH#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 LTC2245IUH#PBF belongs to ADI's legacy Linear Technology high-speed ADC product line, engineered specifically for precision digitization of wide-dynamic-range analog signals in demanding communications and imaging applications.
FAQ
What is the operating temperature range for the LTC2245IUH#PBF?
The LTC2245IUH#PBF is rated for industrial operation from –40°C to +85°C (I-grade), validated across all AC and DC specifications including SNR, SFDR, INL, and power consumption - making it suitable for deployment in outdoor base stations or portable medical devices without derating.
Does the LTC2245IUH#PBF require an external reference?
No, the LTC2245IUH#PBF integrates a precision 1.5V bandgap reference and supports fully self-contained operation using its internal reference. External references are optional and only needed when tighter temperature drift (<±5ppm/°C) or custom full-scale voltage is required - the SENSE pin configures range accordingly.
How does the clock duty cycle stabilizer function in the LTC2245IUH#PBF?
The LTC2245IUH#PBF's clock duty cycle stabilizer uses an internal PLL to regenerate a precise 50% duty cycle clock from the input CLK signal, regardless of input duty cycle (e.g., 30%–70%). It activates when the MODE pin is biased to 1/3VDD or 2/3VDD, eliminating aperture jitter degradation caused by asymmetric clocks from microcontrollers or FPGAs.
Can the LTC2245IUH#PBF interface directly with 1.8V logic systems?
Yes - the LTC2245IUH#PBF features a separate OVDD supply pin (0.5V–3.6V) that can be set to 1.8V, allowing direct connection to 1.8V CMOS logic without level shifters. Output drive strength remains robust (±50mA), and VOL/VOH specs are guaranteed at OVDD = 1.8V per the datasheet's logic output table.
What is the minimum sample rate supported by the LTC2245IUH#PBF?
The LTC2245IUH#PBF supports a minimum sample rate of 1Msps, limited by sample-and-hold capacitor droop due to junction leakage. Below this rate, gain error and offset drift increase beyond specification; for low-frequency applications, the device must be operated within the 1–10Msps range to maintain ±0.5% gain error and ±2mV offset accuracy.
LTC2245IUH#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):
- 10M
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2245IUH#PBF FAQ
1.How can I place an order for LTC2245IUH#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2245IUH#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 LTC2245IUH#PBF reliable?
The price and inventory of LTC2245IUH#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2245IUH#PBF is usually 5 days.
3.What payment methods are accepted for LTC2245IUH#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2245IUH#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2245IUH#PBF?
LTC2245IUH#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2245IUH#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 LTC2245IUH#PBF?
For technical support, including LTC2245IUH#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2245IUH#PBF requirements.
6.How does Aetrix verify that LTC2245IUH#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2245IUH#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 LTC2245IUH#PBF meets industry standards.
7.What is the process for return or replacement of LTC2245IUH#PBF?
All LTC2245IUH#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2245IUH#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 LTC2245IUH#PBF part is unused and in its original packaging.
Return procedure for LTC2245IUH#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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