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Analog Devices Inc. LTC2351CUH-14#PBF
- Part No.:
- LTC2351CUH-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2351CUH-14#PBF.pdf
- Description:
- IC ADC 14BIT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:211
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Product details
Overview
LTC2351CUH-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 1.5 Msps simultaneous-sampling analog-to-digital converter with six differential input channels, 75 dB SINAD, 83 dB common-mode rejection, and operation from a single 3 V supply. It delivers 250 ksps throughput per channel in a 32-pin 5 mm × 5 mm QFN package and supports unipolar (0 V to 2.5 V) or bipolar (±1.25 V) differential input ranges - ideal for multiphase power monitoring systems requiring synchronized voltage/current acquisition.
For engineers reviewing the LTC2351CUH-14#PBF datasheet, LTC2351CUH-14#PBF pinout, LTC2351CUH-14#PBF application, or LTC2351CUH-14#PBF equivalent, key selection criteria include simultaneous sampling integrity, channel-to-channel aperture skew (<200 ps), sleep-mode power (12 μW), SPI-compatible serial interface timing, and BIP/SELx-controlled channel selection flexibility.
Technical Context
The LTC2351CUH-14#PBF integrates six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous acquisition across all six differential pairs. Conversion proceeds at 250 ksps per channel using a 14-bit successive-approximation ADC core with internal 2.5 V 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 (5.5 mA), NAP (1.5 mA), and sleep (4 μA). The 3-wire SPI-compatible serial interface outputs 96-bit data frames (six 14-bit words, MSB-first) aligned to SCK rising edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonicity and full-scale linearity for precision measurement. |
| Sampling Rate | 1.5 Msps aggregate / 250 ksps per channel - enables synchronized capture of fast transients across six phases. |
| SINAD | 75 dB at 100 kHz - supports >11.5 effective bits for high-fidelity signal reconstruction in motor control feedback loops. |
| CMRR | 83 dB at 100 kHz - rejects ground-loop noise and common-mode interference in industrial sensor interfaces. |
| Aperture Skew | 200 ps max between channels - ensures sub-degree phase alignment critical for power quality analysis. |
| Power Consumption | 16.5 mW active, 12 μW sleep - enables battery-backed data loggers and portable energy meters. |
| Input Range | 0 V to 2.5 V (unipolar) or ±1.25 V (bipolar) differential - accommodates both DC-biased and AC-coupled sensor signals. |
Pinout & Package
Package: 32-pin plastic QFN (5 mm × 5 mm), exposed pad (Pin 33) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0+ to CH5+ | Noninverting analog inputs (6 pairs) | Differential voltage sensing nodes; each pair must maintain rail-to-rail common-mode range (0 V to VDD) and differential swing within spec. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Completes differential pair; referenced to corresponding CHx+; enables rejection of shared noise sources. |
| CONV | Conversion start trigger | Rising-edge synchronous sampling command; also controls NAP/sleep entry via pulse count with static SCK. |
| SCK | Serial clock input | Drives conversion sequencing and data output timing; 40 ns minimum pulse width; 96 cycles required for full 6-channel readout. |
| SDO | Three-state serial data output | MSB-first 14-bit words for CH0 through CH5; tri-stated when not actively shifting data. |
| BIP | Bipolar/unipolar mode select | Static logic level during conversion; determines output coding (2's complement vs. straight binary) and input voltage range. |
| SEL2/SEL1/SEL0 | Channel count selector | Binary-encoded control (000–111) to convert 1–6 channels per cycle; reduces latency for subset acquisitions. |
| VREF | 2.5 V internal reference output | Bypassed with 10 μF + 0.1 μF to GND; can be overdriven by external 2.55 V–VDD reference for improved accuracy/stability. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits acquire all channels at identical instant - eliminates inter-channel phase error in power vector calculations. |
| Programmable channel count | SEL2/SEL1/SEL0 enable dynamic reduction from 6 to 1 channel per conversion - increases per-channel throughput up to 1.5 Msps for prioritized signals. |
| Dual-range input support | BIP pin selects 0 V–2.5 V unipolar or ±1.25 V bipolar differential input - simplifies front-end design for mixed AC/DC sensor types. |
| Ultra-low sleep power | 12 μW shutdown state - extends battery life in intermittent-monitoring applications without sacrificing wake-up latency. |
| High CMRR | 83 dB at 100 kHz - preserves signal integrity in noisy industrial environments with long sensor cables or shared grounds. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
Use Scenario: Real-time monitoring of voltage and current waveforms across three-phase AC mains with neutral reference. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized line-to-line voltages and phase currents for RMS, THD, and power factor computation. Use Value: 200 ps channel skew ensures <0.01° phase error at 50 Hz - enabling Class 0.2 metering accuracy per IEC 62053-22. | Use Scenario: Closed-loop field-oriented control (FOC) of 3-phase PMSM/BLDC motors with current sensing on all phases. IC Role / Device Role / Timing Role: Six-channel simultaneous acquisition of motor phase currents and bus voltage for torque ripple minimization and overcurrent protection. Use Value: 250 ksps per channel supports >10 kHz current loop bandwidth while maintaining synchronization across torque-producing axes. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
Use Scenario: Modular test equipment acquiring vibration, temperature, and strain signals from distributed sensors in rotating machinery. IC Role / Device Role / Timing Role: High-resolution, low-latency digitizer for time-correlated multi-sensor analysis with deterministic sampling jitter (<0.3 ps). Use Value: 75 dB SINAD enables detection of sub-millivolt fault signatures in 24-bit-equivalent dynamic range applications. | Use Scenario: Input/output monitoring and battery management in online UPS units during grid failure and inverter switchover. IC Role / Device Role / Timing Role: Simultaneous capture of AC input, DC bus, and inverter output waveforms to detect zero-crossing misalignment and harmonic distortion buildup. Use Value: Sleep mode (12 μW) allows continuous background monitoring without depleting backup batteries during extended outages. |
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, 1 MSPS, 6-channel SAR ADC; integrated PGA and reference; requires external clock; higher power (25 mW active) | Higher resolution but lower sampling rate; better suited for DC-precision sensor arrays than high-speed power analysis | Select when absolute accuracy >1 LSB and programmable gain are required over simultaneous transient fidelity. |
| AD7606C-18 | 18-bit, 1 MSPS, 8-channel simultaneous-sampling ADC; ±10 V/±5 V input range; 2.5 V reference; 45 mW active power | Wider input range and higher resolution; larger 64-lead LQFP package; no sleep mode | Select when measuring higher-voltage industrial signals and 18-bit resolution outweighs power and size constraints. |
Compared with ADS8686SIRTVR and AD7606C-18, the LTC2351CUH-14#PBF offers superior channel-to-channel timing alignment (200 ps skew vs. ≥5 ns), lowest sleep power (12 μW vs. none), and smallest footprint (5 mm × 5 mm QFN), making it optimal for space-constrained, battery-aware, high-synchronization applications.
Availability
LTC2351CUH-14#PBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control feedback, and uninterruptible power supply monitoring requiring stable component supply, guaranteed lead-free compliance, and production-ready traceability.
Supply support for LTC2351CUH-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 LTC2351CUH-14#PBF belongs to ADI's precision data acquisition portfolio, engineered specifically for applications demanding synchronized multi-channel sampling, low power, and robust noise immunity in harsh electrical environments.
FAQ
What is the operating temperature range of the LTC2351CUH-14#PBF?
The LTC2351CUH-14#PBF is rated for 0°C to 70°C ambient operation, as indicated by the "UH" suffix in its part number. This commercial-grade temperature range suits indoor industrial control panels, test equipment, and consumer-grade energy monitors where ambient thermal conditions remain stable and controlled.
Does the LTC2351CUH-14#PBF require an external reference voltage?
No - the LTC2351CUH-14#PBF includes an internal 2.5 V bandgap reference with 15 ppm/°C tempco and 600 μV/V line regulation. However, it supports overdriving with an external reference between 2.55 V and VDD for improved accuracy, stability, or system-level reference sharing - the LTC2351CUH-14#PBF automatically disables its internal reference when an external voltage is applied to VREF.
How does the LTC2351CUH-14#PBF enter and exit sleep mode?
The LTC2351CUH-14#PBF enters sleep mode after four or more CONV pulses with SCK held static (HIGH or LOW); it wakes on the first SCK edge thereafter. VREF requires 2 ms to settle post-wake, and the first conversion after wake-up must allow full acquisition time - the LTC2351CUH-14#PBF maintains this behavior consistently across all operating conditions.
Can the LTC2351CUH-14#PBF convert fewer than six channels per cycle?
Yes - the LTC2351CUH-14#PBF uses SEL2/SEL1/SEL0 to select 1–6 channels per conversion cycle. For example, SELx = 001 converts only CH0 and CH1, completing in 32 SCK cycles instead of 96, thereby increasing per-channel throughput to 500 ksps. All six channels remain simultaneously sampled regardless of SELx setting - the LTC2351CUH-14#PBF discards unused channel data internally.
What is the significance of the "#PBF" suffix in LTC2351CUH-14#PBF?
The "#PBF" suffix denotes lead-free (Pb-free) finish and RoHS-compliant packaging - confirming that the LTC2351CUH-14#PBF meets EU Directive 2011/65/EU requirements. It also indicates tape-and-reel packaging optimized for automated SMT assembly, with the "CUH" prefix specifying the 0°C to 70°C temperature grade and 32-pin QFN package.
LTC2351CUH-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:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2351CUH-14#PBF FAQ
1.How can I place an order for LTC2351CUH-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2351CUH-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 LTC2351CUH-14#PBF reliable?
The price and inventory of LTC2351CUH-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 LTC2351CUH-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2351CUH-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2351CUH-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2351CUH-14#PBF?
LTC2351CUH-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2351CUH-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 LTC2351CUH-14#PBF?
For technical support, including LTC2351CUH-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2351CUH-14#PBF requirements.
6.How does Aetrix verify that LTC2351CUH-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2351CUH-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 LTC2351CUH-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2351CUH-14#PBF?
All LTC2351CUH-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2351CUH-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 LTC2351CUH-14#PBF part is unused and in its original packaging.
Return procedure for LTC2351CUH-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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