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Analog Devices Inc. LTC2321IUFD-14#PBF
- Part No.:
- LTC2321IUFD-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321IUFD-14#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,311
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Product details
Overview
LTC2321IUFD-14#PBF from Analog Devices is a dual-channel, 14-bit + sign successive approximation register (SAR) analog-to-digital converter with differential inputs, 2 Msps per channel throughput, ±1 LSB typical INL, 80 dB SNR at 500 kHz, and integrated 2.048 V / 4.096 V temperature-compensated reference. It operates from single 3.3 V or 5 V supply and supports CMOS or LVDS serial interface - ideal for high-speed data acquisition in motor control and optical networking systems.
For engineers reviewing the LTC2321IUFD-14#PBF datasheet, LTC2321IUFD-14#PBF pinout, LTC2321IUFD-14#PBF application, or LTC2321IUFD-14#PBF equivalent, key selection criteria include guaranteed no-missing-codes operation at 14 bits, wide input common mode range (0 V to VDD), low-power nap/sleep modes (5 µW), and -40°C to +85°C industrial temperature grade.
Technical Context
The LTC2321IUFD-14#PBF implements two independent SAR ADC cores with fully differential sample-and-hold front-ends, each supporting 15-bit two's complement output (14-bit + sign). Its internal reference buffers deliver 2.048 V or 4.096 V with ≤20 ppm/°C drift, and its flexible analog input architecture accepts fully differential, pseudo-differential bipolar, or pseudo-differential unipolar signals without configuration.
Timing is synchronized via CNV falling edge initiation and features no-cycle latency; conversion completes in 220 ns, followed by immediate readout on SCK falling edges. The device supports skew-matched CLKOUT output for deterministic data capture and offers dual-mode digital I/O (CMOS/LVDS) selectable via CMOS/LVDS pin, with OVDD ranging from 1.71 V to 2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign (15-bit two's complement output); enables full-scale digitization of ±4.096 V differential inputs with 250 µV LSB step size. |
| Sampling Rate | 2 Msps per channel; supports real-time acquisition of signals up to 10 MHz bandwidth (-3 dB input linear bandwidth). |
| INL | ±1 LSB typical; ensures monotonic transfer function and accurate end-point linearity for precision closed-loop control. |
| SNR | 80 dB typical at fIN = 500 kHz; delivers >13 effective bits of dynamic resolution in high-frequency signal chains. |
| Reference | Internal 2.048 V / 4.096 V buffer with ≤20 ppm/°C drift; eliminates external reference component count and improves system thermal stability. |
| Power | 33 mW per channel at 2 Msps (5 V supply, CMOS mode); reduces thermal load in dense PCB layouts versus comparable high-speed ADCs. |
| Temperature Range | -40°C to +85°C (I-grade); qualified for industrial automation, remote sensing, and automotive under-hood auxiliary systems. |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed pad (Pin 29) soldered to ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 8) | Analog power supply | Single 3.3 V or 5 V rail powering SAR core and reference buffers; requires local 10 µF + 0.1 µF bypassing. |
| AIN1+, AIN1– (Pins 7, 6) | Channel 1 differential analog input | Accepts ±REFOUT1 voltage swing (±4.096 V max); supports fully differential, pseudo-differential bipolar/unipolar modes without external components. |
| AIN2+, AIN2– (Pins 2, 3) | Channel 2 differential analog input | Independent second channel with identical specs and interface; enables simultaneous sampling for phase-sensitive applications like motor current sensing. |
| CNV (Pin 9) | Conversion start trigger | Falling-edge–initiated acquisition; requires low-jitter source (e.g., FPGA clock) to minimize aperture jitter (1 ps RMS). |
| REFOUT1, REFOUT2 (Pins 12, 26) | Reference buffer outputs | Nominally 4.096 V (or 2.048 V); decoupled locally with 0.1 µF + 10 µF ceramics; disable via REFINT = GND for external reference use. |
| SCK+, SCK– (Pins 21, 22) | Serial clock input | Differential LVDS or single-ended CMOS clock input (up to 64 MHz); determines data rate and timing margin for SPI-compatible readout. |
| SDO1+, SDO1– / SDO2+, SDO2– (Pins 15–16, 19–20) | Channel 1 & 2 serial data outputs | MSB-first, 15-bit two's complement data; LVDS mode requires 100 Ω differential termination at receiver (e.g., FPGA I/O bank). |
| CLKOUT+, CLKOUT– (Pins 17–18) | Skew-matched output clock | Phase-aligned with SDO data edges; enables synchronous latch at receiver to eliminate setup/hold violations in high-speed interfaces. |
| CMOS/LVDS (Pin 25) | I/O mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS; configures driver strength and termination requirements. |
| REFINT (Pin 28) | Reference buffer enable | Tie to VDD for internal reference; tie to GND to disable REFOUT1/2 buffers and allow external reference injection (1.25 V to VDD). |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 14 bits | Guaranteed monotonicity across full operating temperature range (-40°C to +85°C), eliminating code ambiguities in safety-critical feedback loops. |
| Wide input common mode range (0 V to VDD) | Enables direct interfacing with op-amp outputs, isolated amplifiers, or sensor bridges without level-shifting circuitry or rail-to-rail input stages. |
| 80 dB SNR at 500 kHz | Supports high-fidelity digitization of RF IF signals, ultrasound echoes, or vibration spectra without requiring external anti-alias filtering beyond Nyquist. |
| 5 µW sleep mode power | Reduces standby power in battery-operated remote DAQ nodes; wake-up time <10 ms ensures rapid reacquisition after idle periods. |
| LVDS and CMOS interface compatibility | Eliminates need for level translators when connecting to FPGAs or ASICs with mixed I/O standards; simplifies board layout and signal integrity validation. |
Applications
| High-Speed Motor Control | Optical Network Monitoring |
|---|---|
|
Use Scenario: Simultaneous sampling of phase currents and DC bus voltage in three-phase inverters for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual-channel SAR ADC providing synchronized 2 Msps acquisition with no-cycle latency to capture transient overcurrent events and commutation timing. Use Value: Enables precise torque ripple suppression and fast overcurrent protection response (<1 µs detection latency) using internal reference stability and 85 dB CMRR. |
Use Scenario: Real-time monitoring of laser diode bias current and photodiode feedback in coherent optical transceivers. IC Role / Device Role / Timing Role: High-SNR ADC digitizing low-amplitude, high-frequency modulation sidebands (up to 500 kHz) with minimal quantization noise floor impact. Use Value: Delivers 80 dB SNR and –90 dB THD to resolve sub-microamp current variations critical for maintaining wavelength lock and minimizing bit error rates. |
| Industrial Remote Data Acquisition | Automotive ADAS Sensor Fusion |
|
Use Scenario: Compact, low-power edge node acquiring vibration, temperature, and pressure from rotating machinery over long cable runs. IC Role / Device Role / Timing Role: Dual ADC with wide common mode range accepting signals referenced to noisy local grounds or floating sensor supplies. Use Value: Eliminates external instrumentation amplifiers by supporting pseudo-differential unipolar/bipolar inputs directly, reducing BOM cost and board area by >30%. |
Use Scenario: Front-end digitization of radar IF outputs and camera sensor analog video streams in centralized domain controllers. IC Role / Device Role / Timing Role: Dual-channel, 2 Msps ADC with LVDS interface enabling noise-immune transmission across automotive harnesses to SoC processing units. Use Value: LVDS mode provides >60 dB common-mode rejection against EMI in 12 V vehicle environments while maintaining 14-bit accuracy at 85°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8864IDRCT | 16-bit, 1 Msps, single-supply 3 V only, no internal reference, SPI-only CMOS interface | Higher resolution but half the speed; requires external reference and level-shifting for 5 V systems | Select for precision DC-coupled measurements where speed <1 Msps suffices and external reference calibration is acceptable. |
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, 5 V supply, no internal reference, LVDS-only interface, larger 48-lead LFCSP package | Higher speed/resolution but higher power (45 mW/ch), no nap/sleep modes, and no integrated reference | Select for ultra-high-resolution applications (e.g., medical imaging) where board space and power budget permit larger footprint and external reference design. |
Compared with ADS8864IDRCT and AD7960BCPZ-RL7, the LTC2321IUFD-14#PBF uniquely balances 2 Msps throughput, integrated reference, low-power sleep modes, and flexible CMOS/LVDS I/O in a compact 4 mm × 5 mm QFN - making it optimal for space-constrained industrial and automotive edge nodes requiring rapid deployment without reference or interface redesign.
Availability
LTC2321IUFD-14#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical network monitoring equipment, and industrial motor control applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2321IUFD-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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC2321IUFD-14#PBF belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for applications demanding simultaneous dual-channel sampling, low-latency conversion, and robust operation in electrically noisy, thermally demanding environments.
FAQ
What is the operating temperature range of the LTC2321IUFD-14#PBF?
The LTC2321IUFD-14#PBF is rated for industrial operation from –40°C to +85°C (I-grade), verified across all electrical specifications including INL, SNR, and reference drift. This range supports deployment in factory automation PLCs, outdoor telecom equipment, and under-hood automotive subsystems without derating.
Does the LTC2321IUFD-14#PBF require external reference components?
No - the LTC2321IUFD-14#PBF integrates two low-drift (≤20 ppm/°C) reference buffers delivering 2.048 V or 4.096 V. External decoupling (0.1 µF + 10 µF ceramics) is required per REFOUT pin, but no external reference IC or resistor network is needed unless REFINT is grounded to enable external reference injection.
How does the LTC2321IUFD-14#PBF handle pseudo-differential input configurations?
The LTC2321IUFD-14#PBF natively supports pseudo-differential bipolar (e.g., AIN+ = signal, AIN– = VREF/2) and unipolar (AIN+ = signal, AIN– = GND) modes without hardware configuration. Its wide 0 V to VDD common mode range allows direct connection to op-amps or sensors without level-shifting, and output remains in 15-bit two's complement format.
Can the LTC2321IUFD-14#PBF operate with both CMOS and LVDS digital interfaces simultaneously?
No - the LTC2321IUFD-14#PBF uses a single CMOS/LVDS pin (Pin 25) to configure I/O mode: grounded for CMOS, tied to OVDD for LVDS, or floating for low-power LVDS. Both SCK and SDO/CLKOUT interfaces switch together; mixed-mode operation is not supported.
What is the minimum power consumption of the LTC2321IUFD-14#PBF in inactive states?
In Sleep Mode, the LTC2321IUFD-14#PBF draws just 5 µW (typical) with both IVDD and IOVDD combined - verified at 3.3 V and 5 V supplies. This ultra-low state is entered via command sequence and maintains register settings, enabling wake-up and resumption of conversion within 10 ms.
LTC2321IUFD-14#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- 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, 5V
- Voltage - Supply, Digital:
- 3.13V ~ 3.47V, 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321IUFD-14#PBF FAQ
1.How can I place an order for LTC2321IUFD-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321IUFD-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 LTC2321IUFD-14#PBF reliable?
The price and inventory of LTC2321IUFD-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 LTC2321IUFD-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2321IUFD-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321IUFD-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321IUFD-14#PBF?
LTC2321IUFD-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321IUFD-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 LTC2321IUFD-14#PBF?
For technical support, including LTC2321IUFD-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321IUFD-14#PBF requirements.
6.How does Aetrix verify that LTC2321IUFD-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2321IUFD-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 LTC2321IUFD-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2321IUFD-14#PBF?
All LTC2321IUFD-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321IUFD-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 LTC2321IUFD-14#PBF part is unused and in its original packaging.
Return procedure for LTC2321IUFD-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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