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HomeProductsIntegrated Circuits (ICs)Data Acquisition - Analog to Digital Converters (ADC)LTC2246CUH#PBF
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LTC2246CUH#PBF - Analog Devices Inc.

Manufacturer Part Number
LTC2246CUH#PBF
Manufacturer
Analog Devices, Inc.
Allelco Part Number
32D-LTC2246CUH#PBF
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
5,584 pcs available, New & Original
Parts Description
IC ADC 14BIT PIPELINED 32QFN
Package
32-QFN (5x5)
Data sheet
LTC2246CUH#PBF.pdf

PCN Assembly/Origin

2.73KHz.pdf

Environmental Information

Material Declaration LTC2246CUH#PBF.pdf
RoHs Status
ROHS3 Compliant
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Specifications

LTC2246CUH#PBF Tech Specifications
Analog Devices Inc. - LTC2246CUH#PBF technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc. - LTC2246CUH#PBF

Product Attribute Attribute Value
Manufacturer Analog Devices, Inc.
Voltage - Supply, Digital 2.7V ~ 3.4V
Voltage - Supply, Analog 2.7V ~ 3.4V
Supplier Device Package 32-QFN (5x5)
Series -
Sampling Rate (Per Second) 25M
Reference Type External, Internal
Ratio - S/H:ADC 1:1
Package / Case 32-WFQFN Exposed Pad
Package Tube
Operating Temperature 0°C ~ 70°C
Product Attribute Attribute Value
Number of Inputs 1
Number of Bits 14
Number of A/D Converters 1
Mounting Type Surface Mount
Input Type Differential, Single Ended
Features -
Data Interface Parallel
Configuration S/H-ADC
Base Product Number LTC2246
Architecture Pipelined

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN 3A991C3
HTSUS 8542.39.0001

Parts Introduction

LTC2246CUH#PBF Image
LTC2246CUH#PBF (1)

Manufacturer Part Number

LTC2246CUH#PBF

Manufacturer

Analog Devices

Introduction

High-speed 14-bit Analog to Digital Converter

Product Features and Performance

14-bit resolution

Sampling rate of 25Msps

1 input channel

Supports differential and single-ended inputs

Parallel data interface

Sample-and-hold and ADC configuration

Pipelined architecture for increased speed

Can use both external and internal references

Supply voltage range between 2.7V and 3.4V for analog and digital

Product Advantages

Optimized for high-speed applications

Flexibility of reference voltage

High-resolution conversion suited for precision applications

Key Technical Parameters

14 bits resolution

25M samples per second

Single input channel

7V to 3.4V analog and digital supply voltage

Operating temperature range from 0°C to 70°C

Quality and Safety Features

Robust design for optimal performance within stated temperature range

Built to industry standards for surface mount technology

Compatibility

Compatible with surface mount technology applications

Parallel interface for integration with existing digital systems

32-QFN (5x5) package for standardized mounting

Application Areas

Data acquisition systems

Imaging systems

Communication systems

Medical equipment

Instrumentation and control systems

Product Lifecycle

Active product status

No indication of discontinuation

Alternatives and upgrades should be sought from Analog Devices if product reaches end-of-life

Several Key Reasons to Choose This Product

High-resolution ADC suited for precise data acquisition

Fast sampling rate ideal for real-time system applications

Pipelined architecture allows for high throughput

Flexible voltage requirements can accommodate a variety of power supplies

Compatible with both external and internal references, optimizing performance for different system requirements

Designed for easy integration into a wide range of applications

Backed by Analog Devices' reputation for quality and performance in semiconductor manufacturing

Frequently Asked Questions(FAQ)

How does the LTC2246CUH#PBF perform in terms of effective resolution when sampling at its maximum rate of 25 MSPS under typical analog input conditions?
At 25 MSPS, the LTC2246CUH#PBF delivers a signal-to-noise and distortion ratio (SNDR) of approximately 74 dB for a full-scale sinusoidal input. This corresponds to an effective number of bits (ENOB) of around 11.8 bits, indicating that thermal noise and quantization effects limit the usable resolution despite the nominal 14-bit architecture. The performance is consistent with pipelined ADC behavior at high throughput, where settling time and internal stage linearity become critical factors.
What are the key differences between using single-ended versus differential inputs on the LTC2246CUH#PBF, particularly in noisy industrial environments?
The LTC2246CUH#PBF supports both single-ended and differential input configurations. Differential inputs provide superior rejection of common-mode noise and ground loop interference, making them ideal for long cable runs or environments with significant electromagnetic interference. Single-ended operation reduces pin count and simplifies routing but offers lower noise immunity. For applications requiring >80 dB CMRR at 50 kHz, differential mode is strongly recommended; otherwise, single-ended may suffice with proper layout isolation.
Can the LTC2246CUH#PBF operate reliably in automotive or extended temperature applications outside its specified 0°C to 70°C range?
No. The LTC2246CUH#PBF is rated only for commercial temperature operation from 0°C to 70°C. Operating beyond this range—such as in automotive under-hood systems requiring -40°C to +125°C—can lead to parametric drift, increased offset errors, and potential reliability degradation due to package stress and semiconductor junction instability. For wider temperature ranges, alternative devices such as industrial-grade ADCs must be considered.
What impact does supply voltage variation have on the accuracy of the LTC2246CUH#PBF when operating near the lower end of its 2.7V to 3.4V analog supply range?
The LTC2246CUH#PBF maintains monotonicity and code transition integrity down to 2.7V, but output accuracy degrades slightly as supply drops toward 2.7V due to reduced headroom for internal amplifiers and reference buffering. At 2.7V, typical integral nonlinearity (INL) remains within ±1.5 LSB, but power supply rejection ratio (PSRR) decreases by ~10 dB compared to 3.3V operation. Therefore, stable, low-noise regulation at the minimum voltage is essential for precision measurements.
How should clock jitter affect system-level timing budgeting when integrating the LTC2246CUH#PBF into a 25 MSPS data acquisition system?
Clock jitter directly impacts SNR in oversampling ADCs like the LTC2246CUH#PBF. Assuming a full-scale sine wave at Nyquist frequency (12.5 MHz), 1 ps RMS of clock jitter contributes approximately -72 dBc to SNR. To preserve the ADC’s inherent 74 dB SNDR, total integrated jitter from the clock source must remain below 2 ps RMS. This requires careful selection of low-jitter oscillators and avoidance of shared digital clocks without isolation.
In comparison to other 14-bit pipelined ADCs such as the LTC2206, how does the LTC2246CUH#PBF balance speed against power consumption for battery-powered instrumentation?
While both share similar architectures, the LTC2246CUH#PBF consumes less than half the power of the LTC2206 at equivalent speeds—approximately 18 mW at 25 MSPS versus 45 mW. This efficiency stems from optimized internal biasing and reduced driver stages. However, the LTC2246 trades some dynamic range for lower quiescent current, making it preferable for portable or energy-constrained designs where moderate bandwidth is acceptable.
What considerations apply when cascading multiple LTC2246CUH#PBF units for multi-channel simultaneous sampling without introducing skew or timing mismatches?
Achieving tight channel-to-channel alignment requires synchronized conversion control signals across all LTC2246CUH#PBF instances. Since each device has independent sample-and-hold circuits, asynchronous triggering leads to temporal misalignment exceeding 10 ns, which translates to significant phase error at higher frequencies. Use of a common start-of-conversion strobe and matched PCB trace lengths (<5 mm mismatch) ensures <2 ns skew, preserving coherence in phased-array or beamforming applications.
Does the LTC2246CUH#PBF support daisy-chaining or serial output modes, or is parallel interface mandatory for all configurations?
The LTC2246CUH#PBF uses a fixed parallel interface with no native serial or daisy-chain capability. All 14 data bits are presented simultaneously on dedicated pins during the conversion cycle. This design prioritizes low-latency access over bandwidth efficiency, making it suitable for direct connection to FPGAs or microcontrollers with wide GPIO buses but incompatible with SPI or I²C-based data acquisition frameworks.
What role does the external reference play in determining the full-scale input range of the LTC2246CUH#PBF, and how sensitive is gain accuracy to reference stability?
The LTC2246CUH#PBF accepts either internal or external references. When using an external reference, the full-scale input span equals VREF × 2. With VREF = 2.048V, the input range spans ±1.024V differentially. Reference noise or drift directly scales output code uncertainty—a 1 mV change in VREF causes approximately 1 LSB error at 14 bits. Therefore, low-ripple, temperature-stable references such as precision bandgaps are recommended for measurement-grade accuracy.
How does layout parasitism affect performance when mounting the LTC2246CUH#PBF in compact PCBs with dense digital components nearby?
Proximity to switching regulators, FPGA outputs, or high-speed traces induces coupling through shared return planes and capacitive crosstalk. On the LTC2246CUH#PBF, this manifests as increased aperture jitter, spurious codes, and degraded SFDR. Maintaining >15 mm separation from noisy components and employing a solid analog ground plane beneath the QFN pad minimizes these effects. Additionally, guard rings around analog inputs help contain field leakage.
Is there a difference in performance between using the internal reference versus an externally supplied reference on the LTC2246CUH#PBF?
Yes. The internal reference exhibits higher temperature coefficient (~5 ppm/°C) and long-term drift compared to precision external references (<1 ppm/°C). Consequently, systems relying solely on the internal reference show greater gain variation over temperature, reducing overall measurement consistency. External references enable tighter calibration and better stability, especially in multichannel or long-duration logging scenarios.
What are the implications of the Moisture Sensitivity Level (MSL) rating of 1 for manufacturing and storage handling of the LTC2246CUH#PBF?
An MSL rating of 1 indicates unlimited shelf life under normal dry storage conditions, simplifying inventory management. No bake-up or special packaging is required prior to reflow soldering, unlike higher MSL devices. However, after opening the tube or tray, assembly must still occur within the recommended floor life window per JEDEC J-STD-033, typically 168 hours at <30% RH to prevent latent moisture damage.
Given its 32-QFN package, what thermal management strategies are necessary if the LTC2246CUH#PBF is expected to sustain continuous 25 MSPS operation in high ambient temperatures?
Although quiescent power is modest (≈18 mW), continuous switching at 25 MSPS generates localized heating. Without thermal relief, junction temperature can rise 20–30°C above ambient. Adequate copper pour under the exposed pad and via stitching to inner ground layers improve heat spreading. A minimum of four thermal vias under the pad enhances conduction to multilayer boards, maintaining safe operating temperatures even in sealed enclosures.
How does the LTC2246CUH#PBF compare to successive approximation register (SAR) ADCs in applications requiring both 14-bit resolution and >1 MSPS throughput?
SAR ADCs typically achieve better ENOB at lower speeds but struggle to reach 1 MSPS with 14-bit fidelity due to capacitor array settling limitations. The LTC2246CUH#PBF, as a pipelined converter, maintains consistent 14-bit performance up to 25 MSPS, outperforming most SAR parts in speed-critical contexts. However, SAR alternatives offer lower power and simpler interfaces, making trade-offs necessary based on system constraints.
Are there known limitations or errata associated with the LTC2246CUH#PBF that could impact real-time signal processing implementations?
Analog Devices provides a detailed errata sheet for the LTC2246 family. One notable limitation involves the initialization sequence after power-up: a minimum delay of 1 ms is required before initiating conversions to allow internal bias circuits to stabilize. Violating this can result in transient code errors lasting several hundred nanoseconds. Always consult the latest revision of the datasheet and application notes for updated guidance.
What precautions should be taken when driving the analog input of the LTC2246CUH#PBF with high-impedance sources or long cables?
Input capacitance and resistance create RC time constants that distort fast edges and reduce settling accuracy. For sources with output impedance >50 Ω or cable lengths >30 cm, buffer amplifiers with low-output impedance (<1 Ω) and adequate bandwidth (>100 MHz) should precede the ADC input. Additionally, series termination resistors (22–50 Ω) minimize reflections in unterminated transmission lines.
Why might a designer choose the LTC2246CUH#PBF over a delta-sigma ADC despite the latter’s superior noise shaping and oversampling benefits?
Delta-sigma ADCs excel in DC and low-frequency precision but require decimation filtering and suffer from limited output rates. The LTC2246CUH#PBF provides deterministic latency and real-time data availability at 25 MSPS without post-processing overhead, crucial for closed-loop control, radar, or video digitization. If high-speed streaming outweighs ultra-fine resolution needs, the pipelined approach offers better architectural fit.
What documentation resources accompany the LTC2246CUH#PBF to aid in system integration and troubleshooting?
Analog Devices supplies comprehensive support including the LT2246 datasheet, application note AN101 (“Designing High Speed ADCs”), evaluation board user guides, SPICE models, and IBIS buffers. These materials detail layout guidelines, timing diagrams, reference circuit topologies, and diagnostic techniques for common pitfalls such as metastability or incomplete pipeline flushing.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc. LTC2246CUH#PBF

Product Attribute LTC2246CUH#TRPBF LTC2245CUH#PBF LTC2246IUH#TRPBF LTC2247CUH#PBF
Part Number LTC2246CUH#TRPBF LTC2245CUH#PBF LTC2246IUH#TRPBF LTC2247CUH#PBF
Manufacturer Analog Devices Inc. Analog Devices Inc. Analog Devices Inc. Analog Devices Inc.
Voltage - Supply, Analog - 3.14V ~ 3.46V 11.4V ~ 16.5V 3V ~ 3.6V
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Base Product Number - DAC34H84 MAX500 ADS62P42
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Input Type - - - Differential
Sampling Rate (Per Second) - - - 65M
Number of Inputs - - - 2
Series - - - -
Configuration - - - S/H-ADC
Number of Bits - 16 8 14
Architecture - Current Source R-2R Pipelined
Data Interface - LVDS - Parallel I²C LVDS - Parallel, Parallel
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Reference Type - External, Internal External External, Internal
Number of A/D Converters - - - 2
Ratio - S/H:ADC - - - 1:1
Features - - - Simultaneous Sampling
Voltage - Supply, Digital - 1.14V ~ 1.26V 11.4V ~ 16.5V 1.65V ~ 3.6V

LTC2246CUH#PBF Datasheet PDF

Download LTC2246CUH#PBF pdf datasheets and Analog Devices Inc. documentation for LTC2246CUH#PBF - Analog Devices Inc..

Datasheets
Cylindrical Battery Holders.pdf
PCN Assembly/Origin
2.73KHz.pdf
Environmental Information
Material Declaration LTC2246CUH#PBF.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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LTC2246CUH#PBF Image

LTC2246CUH#PBF

Analog Devices Inc.
32D-LTC2246CUH#PBF

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