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Analog Devices Inc. LTC2351IUH-14#PBF
- Part No.:
- LTC2351IUH-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2351IUH-14#PBF.pdf
- Description:
- IC ADC 14BIT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:447
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Product details
Overview
LTC2351IUH-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 and supports both unipolar (0 V to 2.5 V) and bipolar (±1.25 V) differential input ranges, making it ideal for multiphase power measurement and motor control systems requiring synchronized acquisition.
For engineers reviewing the LTC2351IUH-14#PBF datasheet, LTC2351IUH-14#PBF pinout, LTC2351IUH-14#PBF application, or LTC2351IUH-14#PBF equivalent, key selection criteria include simultaneous sampling capability, rail-to-rail input swing compatibility, 32-pin QFN package thermal performance, low-power shutdown modes (12 μW sleep), and SPI-compatible serial interface timing compliance at 1.5 Msps aggregate rate.
Technical Context
The LTC2351IUH-14#PBF integrates six independent sample-and-hold circuits triggered synchronously on the rising edge of the CONV signal, enabling true simultaneous sampling across all channels. Its internal 2.5 V bandgap reference (15 ppm/°C tempco) supports overdrive by external references up to VDD.
Conversion sequencing is controlled via SEL2–SEL0 pins, allowing dynamic selection of 1–6 active channels per cycle (e.g., 000 = CH0 only; 101 = all six). Output data is serialized MSB-first over a 3-wire SPI-compatible interface in 96 clock cycles for full six-channel reads, with SDO tri-state control enabled by OVDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonic transfer function and deterministic LSB step size for precision measurement. |
| Sampling Rate | 1.5 Msps aggregate / 250 ksps per channel - enables synchronized capture of fast transients across six phases without inter-channel skew. |
| SINAD | 75 dB at 100 kHz - ensures ≥12.2 ENOB for high-fidelity signal reconstruction in power quality monitoring. |
| CMRR | 83 dB at 100 kHz - suppresses ground-loop noise and common-mode interference in noisy industrial environments. |
| Power Dissipation | 16.5 mW active mode - allows battery-powered portable DAQ designs with minimal thermal management overhead. |
| Input Range | 0 V to 2.5 V unipolar or ±1.25 V bipolar differential - supports direct connection to current-sense amplifiers and isolation amplifiers without level-shifting. |
| Aperture Skew | 200 ps max between channels - preserves phase coherence critical for vector control in servo drives. |
Pinout & Package
Package: 32-pin (5 mm × 5 mm) plastic QFN with exposed pad (Pin 33 = GND), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0+ to CH5+ | Noninverting analog inputs (6 pairs) | Differential input terminals supporting rail-to-rail common-mode range (0 V to VDD) and ±1.25 V/0–2.5 V differential swing. |
| CONV | Convert start trigger | Rising-edge synchronous sampling initiator; multiple pulses enable nap (4.5 mW) and sleep (12 μW) modes. |
| SCK, SDO | Serial clock and data output | 3-wire SPI-compatible interface; SDO is three-state with OVDD-controlled logic-high level for voltage-level translation. |
| SEL2–SEL0 | Channel count selector | Binary-coded input selecting 1–6 active channels per conversion cycle (e.g., 101 = all six); must remain static during conversion. |
| BIP | Bipolar/unipolar mode control | Logic-level input setting input range and output coding format (2's complement for bipolar, straight binary for unipolar). |
| VREF | Internal 2.5 V reference output | Bypassed with 10 μF capacitor; can be overdriven by external reference (2.55 V to VDD) for improved accuracy or temperature stability. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S&H circuits acquire all channels at identical instants-eliminates phase error in multi-sensor feedback loops. |
| Low-power shutdown | 12 μW sleep mode reduces system standby power without losing configuration state or reference calibration. |
| Differential input architecture | 83 dB CMRR and 13 pF input capacitance enable robust noise immunity and simplified front-end filtering for high-impedance sensors. |
| Flexible channel sequencing | Hardware-selectable 1–6 channel conversion via SEL pins-enables adaptive throughput scaling (e.g., 500 ksps/ch for 3 channels) without firmware changes. |
| Reference flexibility | Internal 2.5 V reference with 15 ppm/°C tempco or external overdrive support-allows optimization for accuracy, drift, or supply rejection in mission-critical applications. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
Use Scenario: Real-time monitoring of voltage and current waveforms across three-phase AC distribution systems with harmonic analysis up to 50th order. IC Role / Device Role / Timing Role: Simultaneous sampling ADC capturing synchronized line-to-line voltages and phase currents at 250 ksps/channel to preserve phase relationships for RMS, THD, and power factor calculation. Use Value: 200 ps channel-to-channel aperture skew ensures sub-degree phase error at 50 Hz, enabling IEC 61000-4-30 Class A compliance in power analyzers. | Use Scenario: Closed-loop field-oriented control (FOC) of PMSM or induction motors using rotor position and back-EMF sensing. IC Role / Device Role / Timing Role: Six-channel simultaneous acquisition of motor phase currents and DC bus voltage to compute instantaneous torque and flux vectors without interpolation delay. Use Value: 75 dB SINAD at 100 kHz supports >12-bit effective resolution for precise current loop regulation at switching frequencies up to 20 kHz. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
Use Scenario: Portable vibration and thermal monitoring in predictive maintenance equipment with battery life constraints. IC Role / Device Role / Timing Role: Low-power 14-bit ADC acquiring sensor data from accelerometers, thermistors, and strain gauges across six channels with synchronized timestamps. Use Value: 16.5 mW active power and 12 μW sleep mode extend battery runtime while maintaining 14-bit fidelity for FFT-based fault detection algorithms. | Use Scenario: Input/output voltage and current supervision in online double-conversion UPS units during grid failure and battery transition events. IC Role / Device Role / Timing Role: Simultaneous capture of AC input, DC link, and AC output waveforms to detect zero-crossing anomalies, waveform distortion, and load imbalance within 4 μs sampling period. Use Value: 250 ksps/channel throughput enables 4 μs minimum sampling period-critical for detecting sub-cycle faults (<100 μs) before inverter protection triggers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar simultaneous-sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8686SIPWR | 16-bit, 1 MSPS, integrated programmable gain amplifier (PGA), SPI interface, but no sleep mode below 100 μW | Higher resolution suits precision sensor conditioning; lacks 12 μW ultra-low-power sleep for battery-critical systems | Select when 16-bit resolution and on-chip PGA outweigh need for sub-μA shutdown current. |
| AD7606C-16BSTZ | 16-bit, 1 MSPS, 8-channel, parallel/serial interface, ±4.096 V input range, 250 mW active power | Higher channel count and wider input range suit industrial PLC analog input modules; higher power limits portable use | Select for 8-channel systems requiring ±4.096 V range and parallel readout, accepting higher thermal and power budget. |
Compared with ADS8686SIPWR and AD7606C-16BSTZ, the LTC2351IUH-14#PBF uniquely balances 14-bit precision, six-channel simultaneity, 12 μW sleep power, and 5 mm × 5 mm QFN footprint-making it optimal for space- and energy-constrained embedded power electronics where phase coherence and low quiescent power are non-negotiable.
Availability
LTC2351IUH-14#PBF is available at Aetrix Electronics and suitable for multiphase motor control, uninterruptible power supplies, and portable data acquisition systems requiring stable component supply, guaranteed long-term availability, and traceable sourcing from authorized channels.
Supply support for LTC2351IUH-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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2351IUH-14#PBF belongs to ADI's high-speed precision ADC product line, engineered specifically for applications demanding synchronized multi-channel acquisition, low power, and robust noise immunity in harsh electrical environments.
FAQ
What is the operating temperature range for the LTC2351IUH-14#PBF?
The LTC2351IUH-14#PBF is rated for –40°C to +85°C operation, matching the "I" grade specification defined in the official datasheet. This extended industrial temperature range ensures reliable performance in motor drives, power converters, and outdoor instrumentation where ambient conditions exceed commercial-grade limits. The LTC2351IUH-14#PBF maintains full parametric compliance-including 75 dB SINAD and 250 ksps/channel throughput-across this entire range.
How does the LTC2351IUH-14#PBF achieve simultaneous sampling across six channels?
The LTC2351IUH-14#PBF achieves true simultaneous sampling using six independent sample-and-hold (S&H) circuits, each tied to one differential input pair (CH0+/- through CH5+/-). All six S&H units capture their respective analog inputs at the exact same instant-the rising edge of the CONV signal-ensuring zero inter-channel aperture skew beyond the specified 200 ps maximum. This architecture eliminates phase-induced errors in time-critical applications like vector-controlled motor drives, where the LTC2351IUH-14#PBF's hardware-synchronized acquisition is essential.
Can the LTC2351IUH-14#PBF operate with an external reference voltage?
Yes, the LTC2351IUH-14#PBF supports external reference overdrive via the VREF pin, accepting voltages from 2.55 V up to VDD (max 3.6 V). When an external reference is applied, the internal 2.5 V bandgap is disabled, and the converter uses the external source for full-scale definition. This enables improved accuracy, lower tempco, or better power supply rejection than the internal reference-critical in metrology-grade LTC2351IUH-14#PBF implementations where reference stability directly impacts measurement integrity.
What are the power consumption modes of the LTC2351IUH-14#PBF and how are they activated?
The LTC2351IUH-14#PBF offers three power states: active (5.5 mA @ 3 V), nap (1.5 mA), and sleep (4 μA). Nap mode is entered after two consecutive CONV pulses with SCK held static; sleep mode requires four or more such pulses. Both low-power modes retain register settings and reference calibration. Recovery to full operation takes ≤2 ms due to VREF settling time. These modes make the LTC2351IUH-14#PBF suitable for duty-cycled measurement systems where average power must be minimized without sacrificing startup latency.
Does the LTC2351IUH-14#PBF support partial-channel conversion, and how is it configured?
Yes, the LTC2351IUH-14#PBF supports partial-channel conversion via the SEL2–SEL0 pins, allowing selection of 1–6 active channels per cycle (e.g., SEL=000 → CH0 only; SEL=101 → all six). This reduces total conversion time proportionally-three channels require only 48 SCK cycles instead of 96-increasing per-channel throughput (e.g., 500 ksps/ch for three channels). The LTC2351IUH-14#PBF maintains simultaneous sampling for all enabled channels, preserving phase coherence regardless of count.
LTC2351IUH-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 ~ 85°C
- Supplier Device Package:
- 32-QFN (5x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2351IUH-14#PBF FAQ
1.How can I place an order for LTC2351IUH-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2351IUH-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 LTC2351IUH-14#PBF reliable?
The price and inventory of LTC2351IUH-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 LTC2351IUH-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2351IUH-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2351IUH-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2351IUH-14#PBF?
LTC2351IUH-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2351IUH-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 LTC2351IUH-14#PBF?
For technical support, including LTC2351IUH-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2351IUH-14#PBF requirements.
6.How does Aetrix verify that LTC2351IUH-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2351IUH-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 LTC2351IUH-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2351IUH-14#PBF?
All LTC2351IUH-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2351IUH-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 LTC2351IUH-14#PBF part is unused and in its original packaging.
Return procedure for LTC2351IUH-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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