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Analog Devices Inc. LTC2351IUH-14#TRPBF
- Part No.:
- LTC2351IUH-14#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-WFQFN Exposed Pad
- Datasheet:
-
LTC2351IUH-14#TRPBF.pdf
- Description:
- IC ADC 14BIT 32QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,509
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Product details
Overview
LTC2351IUH-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 1.5 Msps simultaneous-sampling ADC 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 per channel throughput in a 32-pin 5 mm × 5 mm QFN package, targeting high-precision multiphase power and motor control systems.
For engineers reviewing the LTC2351IUH-14#TRPBF datasheet, LTC2351IUH-14#TRPBF pinout, LTC2351IUH-14#TRPBF application, or LTC2351IUH-14#TRPBF equivalent, key selection criteria include simultaneous sampling accuracy, bipolar/unipolar mode flexibility via BIP pin, low-power shutdown modes (12 μW sleep), SPI-compatible serial interface timing, and channel-select logic (SEL2–SEL0) for partial-channel conversion.
Technical Context
The LTC2351IUH-14#TRPBF 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 architecture with internal 2.5 V bandgap reference.
It supports dual input ranges: 0 V to 2.5 V unipolar (BIP = LOW) or ±1.25 V bipolar (BIP = HIGH), with output coding in straight binary or 2's complement respectively. Channel count is programmable via SEL2/SEL1/SEL0, allowing conversion of 1–6 channels in sequence, reducing total conversion time when fewer channels are active.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit with no missing codes - guarantees monotonic transfer function and full code coverage over temperature. |
| Sampling Rate | 1.5 Msps aggregate / 250 ksps per channel - enables synchronized capture of fast-changing multiphase waveforms. |
| SINAD | 75 dB at 100 kHz - ensures ≥12.2 ENOB for high-fidelity signal reconstruction in precision measurement. |
| CMRR | 83 dB at 100 kHz - rejects ground-loop noise and common-mode interference in industrial sensor interfaces. |
| Power Dissipation | 16.5 mW active mode (5.5 mA @ 3 V) - supports battery-powered or thermally constrained portable DAQ designs. |
| Shutdown Power | 12 μW sleep mode - extends system standby time without compromising wake-up latency or reference stability. |
| Input Range | 0 V to 2.5 V unipolar or ±1.25 V bipolar differential - simplifies front-end design by eliminating external level-shifting for bipolar signals. |
Pinout & Package
Package: 32-pin plastic QFN (5 mm × 5 mm), exposed pad (Pin 33) tied to GND. Requires soldering of exposed pad for thermal and electrical performance.
| 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); each pair sampled simultaneously. |
| CH0– to CH5– | Inverting analog inputs (6 pairs) | Complement terminals for differential operation; absolute voltage must stay within 0 V to VDD. |
| CONV | Convert start trigger | Rising edge initiates simultaneous sampling and conversion; pulse count controls nap/sleep entry. |
| SCK | Serial clock input | Drives data output timing; 16 clocks per enabled channel, up to 96 clocks for all six channels. |
| SDO | Three-state serial data output | MSB-first output of previous conversion; data order: CH0 → CH1 → CH2 → CH3 → CH4 → CH5. |
| SEL2/SEL1/SEL0 | Channel select control | Binary-encoded selection of 1–6 channels to convert; determines number of SCK cycles required per conversion. |
| BIP | Bipolar/unipolar mode control | LOW = 0 V–2.5 V unipolar (straight binary); HIGH = ±1.25 V bipolar (2's complement). |
| VREF | Internal 2.5 V reference output | Bypassed with 10 μF capacitor; can be overdriven by external 2.55 V–VDD reference for improved accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous sampling | Six independent S/H circuits acquire all channels at identical instant-critical for phase-accurate multiphase analysis. |
| Programmable channel count | SEL2–SEL0 enable conversion of 1–6 channels per cycle, increasing per-channel throughput (e.g., 500 ksps for 3 channels). |
| Dual-range differential input | Single BIP pin selects 0 V–2.5 V unipolar or ±1.25 V bipolar mode-eliminates external gain/level-shift circuitry. |
| Low-latency shutdown | Sleep mode (12 μW) and nap mode (4.5 mW) entered via CONV pulse sequences-enables rapid power-state transitions. |
| High CMRR & low crosstalk | 83 dB CMRR at 100 kHz and –100 dB crosstalk at 1 MHz ensure accurate isolation between adjacent current/voltage sensing paths. |
Applications
| Multiphase Power Measurement | Multiphase Motor Control |
|---|---|
|
Use Scenario: Real-time monitoring of line voltages and currents in 3-phase AC inverters or UPS systems. IC Role / Device Role / Timing Role: Simultaneous sampling of six differential inputs captures instantaneous phase relationships without skew-induced angle error. Use Value: Enables precise calculation of active/reactive power, harmonic content, and imbalance metrics using a single ADC. |
Use Scenario: Closed-loop field-oriented control (FOC) of PMSM or induction motors requiring synchronized current feedback. IC Role / Device Role / Timing Role: Simultaneous acquisition of three phase currents (via shunt resistors) and three back-EMF or position signals. Use Value: Eliminates phase delay between current samples, preserving vector control accuracy at high PWM frequencies. |
| Data Acquisition Systems | Uninterruptible Power Supplies |
|
Use Scenario: Portable or rack-mounted test equipment capturing multi-sensor analog data (voltage, temperature, strain). IC Role / Device Role / Timing Role: High-resolution, low-power ADC with flexible input configuration and SPI interface for microcontroller integration. Use Value: Reduces component count vs. multiple single-channel ADCs while maintaining timing coherence across sensor domains. |
Use Scenario: Input/output voltage/current monitoring and battery management in online double-conversion UPS units. IC Role / Device Role / Timing Role: Simultaneous sampling of AC input, DC bus, inverter output, and battery terminals during transient events. Use Value: Captures correlated fault signatures (e.g., surge + dropout + overcurrent) for deterministic event logging and protection triggering. |
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, 6-channel SAR ADC with integrated PGA and ±10.24 V input range; requires external reference; higher power (25 mW). | Targets higher dynamic range applications (e.g., wide-range industrial sensors) but lacks built-in 2.5 V reference and sleep mode. | Select when extended input range or programmable gain is required; verify layout compatibility with larger 32-pin TSSOP package. |
| AD7606C-16BSTZ | 16-bit, 1 MSPS, 8-channel simultaneous-sampling ADC with on-chip oscillator, ±10 V input range, and 2.5 V reference; 44-pin LQFP. | Offers two more channels and wider input range but consumes 110 mW active power and lacks ultra-low-power shutdown. | Choose for 8-channel systems needing higher resolution and integrated clock; avoid where board space or sleep-mode power is critical. |
Compared with ADS8686SIPWR and AD7606C-16BSTZ, the LTC2351IUH-14#TRPBF provides optimal balance of low power (16.5 mW), integrated reference, and compact QFN footprint-making it preferred for space- and energy-constrained multiphase monitoring where 14-bit resolution suffices.
Availability
LTC2351IUH-14#TRPBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control, and uninterruptible power supply applications requiring stable component supply, guaranteed long-term availability, and traceable sourcing.
Supply support for LTC2351IUH-14#TRPBF 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 LTC2351IUH-14#TRPBF belongs to ADI's high-speed precision SAR ADC product line, designed specifically for demanding real-time control and measurement systems requiring simultaneous sampling, low power, and robust noise immunity.
FAQ
What is the operating temperature range of the LTC2351IUH-14#TRPBF?
The LTC2351IUH-14#TRPBF is rated for –40°C to +85°C industrial temperature operation, as confirmed by its "I" grade designation in the part number and Absolute Maximum Ratings table. This range supports deployment in motor drives, power converters, and outdoor industrial equipment without derating.
How does the LTC2351IUH-14#TRPBF achieve simultaneous sampling across six channels?
The LTC2351IUH-14#TRPBF uses six independent sample-and-hold (S/H) circuits, each associated with one differential input pair (CH0± through CH5±). All S/Hs capture their respective analog inputs at the exact same instant-the rising edge of the CONV signal-ensuring zero inter-channel aperture skew.
Can the LTC2351IUH-14#TRPBF use an external reference, and what are the requirements?
Yes, the LTC2351IUH-14#TRPBF allows overdriving its internal 2.5 V reference via the VREF pin with an external source between 2.55 V and VDD. The external reference must be stable, low-noise, and capable of sinking/source current during settling; typical bypass remains 10 μF ceramic.
What is the minimum acquisition time required for full 14-bit accuracy at maximum throughput?
The LTC2351IUH-14#TRPBF specifies a 39 ns sample-and-hold acquisition time (tACQ) for full accuracy at 1.5 Msps aggregate rate. This time must be met by the driving source-including any buffer amplifier-to ensure the internal capacitors fully settle before conversion begins.
How does the SEL2/SEL1/SEL0 configuration affect conversion timing and data output?
SEL2/SEL1/SEL0 determine how many of the six channels are converted per cycle: 000 = 1 channel (16 SCK), 001 = 2 channels (32 SCK), up to 101–111 = 6 channels (96 SCK). Data is always output MSB-first in CH0→CH5 order, regardless of enabled count.
LTC2351IUH-14#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2351IUH-14#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2351IUH-14#TRPBF 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#TRPBF reliable?
The price and inventory of LTC2351IUH-14#TRPBF 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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2351IUH-14#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2351IUH-14#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2351IUH-14#TRPBF?
LTC2351IUH-14#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2351IUH-14#TRPBF 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#TRPBF?
For technical support, including LTC2351IUH-14#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2351IUH-14#TRPBF requirements.
6.How does Aetrix verify that LTC2351IUH-14#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2351IUH-14#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2351IUH-14#TRPBF?
All LTC2351IUH-14#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2351IUH-14#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC2351IUH-14#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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