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Analog Devices Inc. LTC2321HUFD-14
- Part No.:
- LTC2321HUFD-14
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321HUFD-14.pdf
- Description:
- IC ADC 14BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,980
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Product details
Overview
LTC2321HUFD-14 from Analog Devices is a dual, 14-bit + sign, 2Msps differential input successive approximation register (SAR) analog-to-digital converter with wide input common mode range (0V to VDD), onboard 2.048V/4.096V temperature-compensated reference, and CMOS/LVDS serial interface. It achieves ±0.5LSB typical INL, 73dB SNR at 500kHz, and operates from –40°C to +125°C in a 28-lead 4mm × 5mm QFN package - ideal for high-speed industrial data acquisition and motor control.
For engineers reviewing the LTC2321HUFD-14 datasheet, LTC2321HUFD-14 pinout, LTC2321HUFD-14 application, or LTC2321HUFD-14 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply support for high-reliability embedded systems requiring extended temperature operation.
Technical Context
The LTC2321HUFD-14 implements two independent SAR ADC cores with fully differential sampling architecture, each supporting 14-bit + sign resolution (13-bit effective) across ±REFOUT1/2 voltage spans. Its internal reference buffers deliver 4.096V (±0.2% initial accuracy, 20ppm/°C max drift) and support external reference override via REFINT pin.
It features zero-cycle latency conversion timing, simultaneous dual-channel sampling, and flexible digital I/O: selectable CMOS (1.8V–2.5V OVDD) or LVDS (2.5V OVDD) serial interface with skew-matched CLKOUT output, SDO1/SDO2 differential outputs, and SCK+/SCK– differential clock input - all operating at up to 64MHz SCK frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign (13-bit effective), enabling 8192-level full-scale quantization with sign bit for bipolar signal capture. |
| Sampling Rate | 2Msps per channel, supporting real-time acquisition of signals up to 10MHz linear bandwidth without aliasing. |
| INL (Typ) | ±0.5LSB, ensuring <0.006% full-scale linearity error critical for closed-loop control and precision instrumentation. |
| SNR (Typ) | 73dB at fIN = 500kHz, delivering >12-bit effective resolution for dynamic signal fidelity in noisy environments. |
| Operating Temp | –40°C to +125°C, qualified for under-hood automotive, industrial PLC, and aerospace edge-sensing applications. |
| Reference | Internal 4.096V (or 2.048V) buffered reference with 20ppm/°C max drift, eliminating need for external precision reference in most designs. |
| Power (2Msps) | 30mW per channel (CMOS mode, VDD = 5V), enabling low-power high-speed data acquisition in thermally constrained systems. |
Pinout & Package
Package: 28-lead (4mm × 5mm) plastic QFN (UFD) with exposed thermal pad (Pin 29 = GND). Pinout validated per Linear Technology (Analog Devices) LTC2321-12 datasheet Rev. FB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1, 8) | Analog power supply | Single 3.3V or 5V rail powering ADC core and internal LDOs; requires local 10µF + 0.1µF bypassing. |
| AIN1+, AIN1– (6, 7) | Channel 1 differential analog input | Accepts ±4.096V differential span with 0V–VDD common mode; supports pseudo-differential unipolar/bipolar without configuration. |
| AIN2+, AIN2– (2, 3) | Channel 2 differential analog input | Independent second channel with identical electrical specs and timing as Channel 1. |
| CNV (9) | Conversion start trigger | Falling-edge–sensitive; initiates sample-and-hold and conversion with zero-cycle latency - critical for deterministic timing in control loops. |
| SCK+, SCK– (21, 22) | Differential serial clock input | LVDS-mode only; enables jitter-immune clock distribution; CMOS mode uses SCK+ only (SCK– NC). |
| SDO1+, SDO1– (15, 16) | Channel 1 serial data output | MSB-first 13-bit two's complement code; LVDS mode requires 100Ω differential termination at FPGA/CPLD receiver. |
| CLKOUT+, CLKOUT– (17, 18) | Skew-matched output clock | Provides phase-aligned clock to latch SDO data at receiver - eliminates setup/hold violations in high-speed interfaces. |
| REFOUT1, REFOUT2 (12, 26) | Internal reference outputs | Nominally 4.096V buffered references; decoupled with 10µF + 0.1µF ceramics; disabled when REFINT = GND for external reference use. |
| REFINT (28) | Reference enable control | Pull-up to VDD enables internal buffers; grounding disables both REFOUT1/2 to accept external 1.25V–5V references. |
| CMOS/LVDS (25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS - configures driver strength and termination behavior. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 14-bit + sign SAR ADCs | Enables synchronous sampling of two high-bandwidth signals (e.g., current/voltage in motor phase) without inter-channel skew. |
| Zero-cycle latency conversion | Eliminates pipeline delay - output data available immediately after conversion completes, essential for real-time feedback control. |
| Onboard 4.096V/2.048V reference with 20ppm/°C drift | Reduces BOM count and layout area; meets stability requirements for Class I industrial sensors without external trimming. |
| CMOS or LVDS serial interface with CLKOUT | Supports direct connection to FPGA I/O banks (1.8V/2.5V) or high-noise immunity over longer traces using differential signaling. |
| –40°C to +125°C guaranteed operation | Qualified per AEC-Q100 stress test conditions; suitable for engine control units, inverters, and downhole instrumentation. |
| Flexible analog input modes (fully diff / pseudo-diff bipolar/unipolar) | No external resistor networks or configuration registers needed - simplifies firmware and reduces PCB layer count. |
Applications
| Motor Phase Current & Voltage Sensing | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Simultaneous sampling of phase current (shunt-based) and bus voltage in a 3-phase inverter for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel ADC providing synchronized, zero-latency 14-bit + sign samples at 2Msps to compute instantaneous torque and flux vectors. Use Value: Enables <1µs current loop update rates and <0.1% THD in motor drive output - directly improving efficiency and acoustic noise performance. | Use Scenario: High-density analog input card in modular PLC handling 16 channels of 4–20mA or ±10V sensor inputs across multiple racks. IC Role / Device Role / Timing Role: Dual ADC per slot provides oversampling capability and channel redundancy while maintaining isolation barrier timing integrity. Use Value: Reduces per-channel component count by eliminating external references and op-amp signal conditioning stages - cutting board cost by ~$1.20/channel. |
| Automotive Battery Management System (BMS) | Optical Network Transceiver Monitoring |
Use Scenario: Cell voltage and temperature monitoring in high-voltage EV battery packs operating at –40°C to +85°C ambient (junction up to 125°C). IC Role / Device Role / Timing Role: Precision ADC capturing 16-cell stack voltages with 1mV resolution and guaranteed spec compliance across full automotive temperature range. Use Value: Eliminates need for external temperature compensation algorithms - improves SoC estimation accuracy by ±0.5% over lifetime. | Use Scenario: Real-time monitoring of laser diode bias current, TEC voltage, and photodiode feedback in 400G coherent optical modules. IC Role / Device Role / Timing Role: Dual ADC digitizing fast transient events (e.g., laser turn-on overshoot) and slow thermal drift on same die with matched gain/offset. Use Value: Enables closed-loop power stabilization within 50ns response time - meeting IEEE 802.3bs eye diagram mask requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5Msps, single-channel, no integrated reference, requires external 5V reference and driver op-amps. | Higher resolution but lacks dual-channel sync and onboard reference - increases BOM and layout complexity. | Select when absolute precision >16-bit and throughput >3Msps are required; not drop-in due to pinout, power, and interface differences. |
| ADS8860IRGET | 16-bit, 1Msps, single-channel, SPI-only (CMOS), 2.5V supply only, no LVDS or extended temp grade. | Lower speed and no high-temp option limits use in real-time control; no differential clock or skew-matched CLKOUT. | Consider for cost-sensitive, non-automotive applications where 1Msps and commercial temp suffice - requires redesign for thermal and timing robustness. |
Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2321HUFD-14 uniquely combines dual-channel synchronization, integrated reference, LVDS timing robustness, and AEC-Q100–compatible temperature range - reducing system-level validation effort and enabling faster time-to-market for industrial and automotive edge nodes.
Availability
LTC2321HUFD-14 is available at Aetrix Electronics and suitable for high-reliability industrial automation, automotive powertrain sensing, and aerospace telemetry systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2321HUFD-14 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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2321 family was designed specifically for high-speed, high-accuracy data acquisition in thermally demanding environments - emphasizing zero-latency timing, integrated reference stability, and dual-channel coherence for real-time control systems.
FAQ
What is the maximum sampling rate supported by the LTC2321HUFD-14?
The LTC2321HUFD-14 supports a maximum sampling rate of 2Msps per channel, with guaranteed timing performance across its full –40°C to +125°C operating temperature range. This rate is maintained regardless of interface mode (CMOS or LVDS) and enables acquisition of signals with up to 10MHz linear bandwidth. The device achieves zero-cycle latency, meaning output data is available immediately after conversion completion - critical for deterministic control loops. At 2Msps, power dissipation remains at 30mW per channel in CMOS mode with 5V VDD.
Does the LTC2321HUFD-14 include an internal voltage reference?
Yes, the LTC2321HUFD-14 integrates two precision, temperature-compensated voltage references: REFOUT1 and REFOUT2, each programmable to nominally 4.096V or 2.048V. These buffers exhibit ≤20ppm/°C maximum drift and ±0.2% initial accuracy, eliminating the need for external references in most applications. The REFINT pin controls buffer enable/disable - tying it to ground disables both buffers, allowing external references from 1.25V to 5V to be applied directly to REFOUT1/REFOUT2 pins.
Can the LTC2321HUFD-14 operate in LVDS mode, and what are the requirements?
Yes, the LTC2321HUFD-14 supports LVDS mode via the CMOS/LVDS pin (Pin 25) tied to OVDD. In LVDS mode, SCK+, SCK–, SDO1+, SDO1–, SDO2+, SDO2–, CLKOUT+, and CLKOUT– become active differential pairs requiring 100Ω differential termination at the receiver (e.g., FPGA). OVDD must be 2.5V, and the interface draws higher current (7.1mA typical) than CMOS mode. LVDS operation provides superior noise immunity and timing margin for long-trace or high-noise industrial environments.
What is the significance of the "H" grade in LTC2321HUFD-14?
The "H" grade in LTC2321HUFD-14 denotes the highest industrial temperature rating: guaranteed operation from –40°C to +125°C ambient, with junction temperature compliance verified per AEC-Q100 stress test conditions. This grade includes enhanced process screening, extended burn-in, and tighter parametric testing across temperature - making it suitable for under-hood automotive, industrial motor drives, and downhole oil/gas equipment where thermal reliability is non-negotiable.
How does the LTC2321HUFD-14 handle pseudo-differential unipolar inputs?
The LTC2321HUFD-14 supports pseudo-differential unipolar inputs natively - for example, connecting AIN1– to ground and applying a 0V–4.096V signal to AIN1+. No external resistors or configuration bits are needed. The ADC automatically interprets the difference (AIN1+ – AIN1–) and outputs 13-bit two's complement codes spanning 0x0000 to 0x1FFF (0 to +4095), with 1LSB = 1mV when REFOUT = 4.096V. This mode preserves full 12-bit resolution across the unipolar span while leveraging the ADC's high CMRR (>85dB) to reject ground noise.
LTC2321HUFD-14 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 2
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- LVDS - Serial, Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3.13V ~ 3.47V, 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 3.13V ~ 3.47V, 4.75V ~ 5.25V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321HUFD-14 FAQ
1.How can I place an order for LTC2321HUFD-14 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321HUFD-14 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 LTC2321HUFD-14 reliable?
The price and inventory of LTC2321HUFD-14 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2321HUFD-14 is usually 5 days.
3.What payment methods are accepted for LTC2321HUFD-14?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321HUFD-14 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321HUFD-14?
LTC2321HUFD-14 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321HUFD-14 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 LTC2321HUFD-14?
For technical support, including LTC2321HUFD-14 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321HUFD-14 requirements.
6.How does Aetrix verify that LTC2321HUFD-14 is sourced from the original manufacturer or authorized distributors?
All LTC2321HUFD-14 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 LTC2321HUFD-14 meets industry standards.
7.What is the process for return or replacement of LTC2321HUFD-14?
All LTC2321HUFD-14 units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321HUFD-14, 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 LTC2321HUFD-14 part is unused and in its original packaging.
Return procedure for LTC2321HUFD-14:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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