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Analog Devices Inc. LTC2351HUH-14#PBF
- Part No.:
- LTC2351HUH-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2351HUH-14#PBF.pdf
- Description:
- IC ADC 14BIT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
LTC2351HUH-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 1.5Msps simultaneous-sampling analog-to-digital converter with six differential input channels, 75dB SINAD at 100kHz, 83dB common-mode rejection, and operation over –40°C to +125°C. It draws only 6mA active current from a single 3V supply and supports unipolar (0V–2.5V) or bipolar (±1.25V) differential inputs - ideal for high-accuracy multiphase power monitoring in industrial motor drives.
For engineers reviewing the LTC2351HUH-14#PBF datasheet, LTC2351HUH-14#PBF pinout, LTC2351HUH-14#PBF application, or LTC2351HUH-14#PBF equivalent, key selection criteria include channel-to-channel aperture skew (200ps), sleep-mode power (12μW), SPI-compatible serial interface timing, and guaranteed performance across extended temperature range.
Technical Context
The LTC2351HUH-14#PBF integrates six independent sample-and-hold circuits triggered simultaneously on the rising edge of CONV, enabling true phase-coherent acquisition across all channels. Conversion proceeds at 250ksps per channel using a single 14-bit successive-approximation ADC core with internal 2.5V bandgap reference.
Its architecture supports programmable channel count (1–6) via SEL2/SEL1/SEL0, bipolar/unipolar mode selection via BIP, and three power states: active (6mA), NAP (1.8mA), and sleep (12μW). The 32-pin QFN package features dedicated analog/digital grounds (GND, DGND, OGND), separate analog/digital supplies (VCC/VDD/OVDD), and rail-to-rail compatible digital I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - ensures monotonic transfer function and full 16,384-code dynamic range. |
| Sampling Rate | 1.5Msps aggregate / 250ksps per channel - enables synchronized capture of six waveforms at 4μs minimum inter-conversion interval. |
| SINAD | 75dB at 100kHz (H-grade) - supports >11.5 effective bits for precision measurement in noisy industrial environments. |
| CMRR | 83dB at 100kHz - rejects ground-loop noise and common-mode interference in differential sensor interfaces. |
| Aperture Skew | 200ps max between channels - preserves phase alignment critical for vector control and power quality analysis. |
| Supply Current | 6mA active, 1.8mA NAP, 12μW sleep - enables low-power wake-on-event architectures in battery-backed systems. |
| Input Range | 0V–2.5V unipolar or ±1.25V bipolar differential - configurable via BIP pin; output format matches mode (straight binary / two's complement). |
Pinout & Package
Package: 32-pin (5mm × 5mm) plastic QFN with exposed thermal pad (Pin 33 = GND). Requires soldering exposed pad to solid ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0+ to CH5+ | Noninverting analog inputs (6 pairs) | Differential inputs support rail-to-rail common-mode (0V to VDD); each pair sampled simultaneously with ≤200ps skew. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Paired with corresponding CHx+; differential swing must stay within 0–2.5V (unipolar) or ±1.25V (bipolar). |
| CONV | Conversion start trigger | Rising edge initiates simultaneous sampling; multiple pulses enter NAP/sleep modes - no external timing controller needed. |
| SCK / SDO | Serial clock and data output | 3-wire SPI-compatible interface; 96 clocks required for full 6-channel readout; SDO is three-state with OVDD-referenced logic levels. |
| SEL2/SEL1/SEL0 | Channel selection control | Binary-encoded selection of 1–6 active channels; determines conversion sequence length (16–96 SCK cycles) and throughput per channel. |
| BIP | Bipolar/unipolar mode select | Static logic level sets input range and output coding format; requires full acquisition time before next conversion if changed. |
| VREF | Internal 2.5V reference output | Stable 15ppm/°C tempco; bypassed with 10μF + 0.1μF; can be overdriven by external 2.55V–VDD reference for improved accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits triggered by single CONV edge - eliminates inter-channel phase error in power electronics feedback loops. |
| Programmable channel count | SEL2/SEL1/SEL0 configure 1–6 active channels - enables flexible trade-off between per-channel throughput (up to 500ksps for 3 channels) and system latency. |
| Low-power sleep mode | 12μW shutdown with 2ms VREF wake-up settling - suitable for energy-conscious data loggers and predictive maintenance sensors. |
| Differential input architecture | 83dB CMRR + rail-to-rail common-mode range - allows direct connection to isolated current/voltage transducers without level-shifting. |
| Robust industrial rating | –40°C to +125°C operating range (H-grade) - qualified for under-hood automotive, solar inverters, and factory automation equipment. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
|
Use Scenario: Real-time monitoring of line voltage and current in 3-phase AC systems for power quality analysis and fault detection. IC Role / Device Role / Timing Role: Simultaneous sampling of six differential inputs captures instantaneous voltage/current vectors with <200ps channel skew for accurate RMS, THD, and harmonic calculations. Use Value: Enables compliance with IEC 61000-4-30 Class A power analyzers using a single IC instead of multiple synchronized converters. |
Use Scenario: Closed-loop field-oriented control (FOC) of permanent magnet synchronous motors (PMSM) in industrial drives. IC Role / Device Role / Timing Role: Captures back-EMF and phase currents synchronously to compute rotor position and torque commands with deterministic 4μs conversion period. Use Value: Eliminates need for external synchronization circuitry while maintaining <0.1° electrical angle error across temperature and supply variation. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
|
Use Scenario: High-channel-count vibration and thermal monitoring in predictive maintenance gateways for rotating machinery. IC Role / Device Role / Timing Role: Six differential inputs acquire accelerometer, thermocouple, and strain gauge signals simultaneously with 75dB SINAD at 100kHz bandwidth. Use Value: Reduces BOM count and PCB area versus discrete ADC solutions while preserving phase coherence for FFT-based spectral analysis. |
Use Scenario: Input/output voltage and current supervision in online UPS systems during grid transition events. IC Role / Device Role / Timing Role: Monitors AC input, battery DC bus, and inverter output with synchronized sampling to detect zero-crossing misalignment and waveform distortion. Use Value: Supports seamless transfer (<10ms) by correlating input/output phase relationships - critical for IT infrastructure protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8686SIRTVR | 16-bit, 1Msps, 6-channel SAR ADC; integrated PGA and reference; SPI interface; 4.5V–5.5V supply only. | Higher resolution but lower speed; lacks sleep mode (12mW active); requires external power sequencing for multi-rail systems. | Choose when 16-bit resolution outweighs 1.5Msps throughput and ultra-low sleep power requirements. |
| AD7606C-16BSTZ | 16-bit, 1Msps, 8-channel simultaneous-sampling ADC; ±10V/±5V input ranges; parallel/SPI interface; 2.3V–5.25V supply. | Wider input range and more channels; higher power (43mW active); larger 64-lead LQFP package; no sleep mode. | Choose for legacy industrial PLCs requiring ±10V inputs and parallel bus interfacing, not for space- or power-constrained designs. |
Compared with ADS8686SIRTVR and AD7606C-16BSTZ, the LTC2351HUH-14#PBF delivers optimal balance of speed (1.5Msps), ultra-low sleep power (12μW), compact 5mm × 5mm QFN packaging, and guaranteed –40°C to +125°C operation - making it uniquely suited for thermally demanding, battery-aware power electronics control.
Availability
LTC2351HUH-14#PBF is available at Aetrix Electronics and suitable for multiphase motor control, uninterruptible power supplies, and industrial data acquisition systems requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC2351HUH-14#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 LTC2351HUH-14#PBF belongs to ADI's high-speed precision ADC family, engineered specifically for phase-coherent, low-power, wide-temperature sensing in mission-critical power conversion and motor control systems.
FAQ
What is the operating temperature range of the LTC2351HUH-14#PBF?
The LTC2351HUH-14#PBF is rated for operation from –40°C to +125°C, meeting the H-grade specification. This extended range is validated across all key parameters including SINAD (75dB at 100kHz), offset error (±1mV), and supply current (6mA typical), making it suitable for under-hood automotive and industrial power electronics where ambient temperatures exceed 100°C.
How does the LTC2351HUH-14#PBF achieve simultaneous sampling across six channels?
The LTC2351HUH-14#PBF achieves true simultaneous sampling using six independent sample-and-hold (S&H) circuits, all triggered by the rising edge of the CONV signal. Each S&H captures its respective differential input (CHx+/CHx–) at the exact same instant, with channel-to-channel aperture skew guaranteed at ≤200ps - ensuring phase coherence essential for vector calculations in motor control and power metering.
Can the LTC2351HUH-14#PBF use an external reference, and what are the requirements?
Yes, the LTC2351HUH-14#PBF supports external reference override via the VREF pin. An external reference between 2.55V and VDD (max 3.6V) can be applied to improve accuracy or match system-level reference standards. When using an external reference, the internal 2.5V bandgap is disabled, and the external source must drive ≤0.2Ω output impedance with ≤2ms settling time to maintain specified dynamic performance.
What power-saving modes does the LTC2351HUH-14#PBF support, and how are they activated?
The LTC2351HUH-14#PBF supports two low-power states: NAP mode (1.8mA, entered with two CONV pulses while SCK is held static) and sleep mode (12μW, entered with four or more CONV pulses under same condition). Both modes retain register state and require only one SCK pulse to resume active conversion - enabling rapid wake-up for event-driven sampling in energy-sensitive applications.
Is the LTC2351HUH-14#PBF pin-compatible with other members of the LTC2351 family?
Yes, the LTC2351HUH-14#PBF shares identical pinout, package (32-pin 5mm × 5mm QFN), and electrical interface with LTC2351CUH-14#PBF (0°C–70°C) and LTC2351IUH-14#PBF (–40°C–85°C). All variants use the same CONV-triggered conversion protocol, SEL/BIP control logic, and SPI timing - allowing drop-in replacement across temperature grades without PCB or firmware changes.
LTC2351HUH-14#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):
- 1.5M
- Number of Inputs:
- 6
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- S/H-MUX-ADC
- Ratio - S/H:ADC:
- 6:1
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2351HUH-14#PBF FAQ
1.How can I place an order for LTC2351HUH-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2351HUH-14#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 LTC2351HUH-14#PBF reliable?
The price and inventory of LTC2351HUH-14#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2351HUH-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2351HUH-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2351HUH-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2351HUH-14#PBF?
LTC2351HUH-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2351HUH-14#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 LTC2351HUH-14#PBF?
For technical support, including LTC2351HUH-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2351HUH-14#PBF requirements.
6.How does Aetrix verify that LTC2351HUH-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2351HUH-14#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 LTC2351HUH-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2351HUH-14#PBF?
All LTC2351HUH-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2351HUH-14#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 LTC2351HUH-14#PBF part is unused and in its original packaging.
Return procedure for LTC2351HUH-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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