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Analog Devices Inc. LTC2321HUFD-14#PBF
- Part No.:
- LTC2321HUFD-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321HUFD-14#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:295
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Product details
Overview
LTC2321HUFD-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 4.096 V temperature-compensated reference. It operates from single 3.3 V or 5 V supply, supports CMOS/LVDS serial interface, and is rated for –40°C to +125°C operation in high-reliability industrial and automotive data acquisition systems.
For engineers reviewing the LTC2321HUFD-14#PBF datasheet, LTC2321HUFD-14#PBF pinout, LTC2321HUFD-14#PBF application, or LTC2321HUFD-14#PBF equivalent, key selection considerations include guaranteed no-missing-codes performance at 14 bits, wide input common mode range (0 V to VDD), low-power nap/sleep modes (5 µW), and dual-channel simultaneous sampling capability for phase-critical motor control and imaging.
Technical Context
The LTC2321HUFD-14#PBF implements two independent SAR ADC cores with shared timing control and separate analog front-ends, enabling true simultaneous sampling of two differential signals. Each channel features a 15-bit two's complement output (14-bit + sign), internal 4.096 V reference with ≤20 ppm/°C drift, and configurable CMOS or LVDS serial I/O with skew-matched CLKOUT for deterministic timing alignment.
Its analog input architecture supports fully differential, pseudo-differential bipolar, and pseudo-differential unipolar modes without external configuration-each with defined code mapping per Table 1. The device achieves no-cycle latency and maintains ±1 LSB INL over full temperature range (–40°C to +125°C), validated by guaranteed specifications-not typical-only data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign (15-bit two's complement output), delivering 250 µV LSB step size with 4.096 V reference |
| Sampling Rate | 2 Msps per channel, enabling real-time capture of signals up to 10 MHz linear bandwidth |
| INL Error | ±1 LSB typical, –4 to +4 LSB guaranteed over –40°C to +125°C - ensures monotonicity and calibration stability |
| SNR | 80 dB typical at fIN = 500 kHz, supporting >12.5 ENOB in high-fidelity acquisition |
| Reference | Internal 4.096 V (or 2.048 V) buffered reference, max 20 ppm/°C drift, eliminating external reference design burden |
| Power Dissipation | 33 mW per channel at 2 Msps (5 V), 5 µW in sleep mode - enables thermally constrained embedded deployments |
| Supply Range | VDD = 4.75 V to 5.25 V or 3.13 V to 3.47 V; OVDD = 1.71 V to 2.63 V - supports mixed-voltage FPGA/DSP interfacing |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed thermal pad (Pin 29 = GND). Requires soldering of exposed pad to PCB 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 ADC core and reference; requires local 10 µF + 0.1 µF bypassing |
| AIN1+, AIN1– (Pins 7, 6); AIN2+, AIN2– (Pins 2, 3) | Differential analog inputs (Channel 1 & 2) | Supports ±4.096 V differential span, 0 V to VDD common mode range; no external configuration needed for bipolar/unipolar modes |
| CNV (Pin 9) | Conversion start trigger | Falling edge initiates sample-and-hold and conversion; low-jitter requirement ensures aperture jitter ≤1 ps RMS |
| SCK+, SCK– (Pins 21, 22) | Serial clock input | Differential LVDS or single-ended CMOS clock input; determines maximum 64 MHz SCK frequency for readout |
| SDO1+/–, SDO2+/– (Pins 15–16, 19–20) | Serial data outputs (per channel) | MSB-first, 15-bit two's complement data; LVDS mode requires 100 Ω differential termination at receiver |
| CLKOUT+/– (Pins 17–18) | Skew-matched output clock | Phase-aligned with SDO edges to eliminate setup/hold uncertainty at FPGA/CPLD latch points |
| REFOUT1/2 (Pins 12, 26) | Reference buffer outputs | Nominally 4.096 V; decoupled with 10 µF + 0.1 µF capacitors; disable via REFINT (Pin 28) for external reference use |
| CMOS/LVDS (Pin 25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS - configures driver strength and power consumption |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | Enables precise phase relationship capture between two signals - critical for multiphase motor current sensing and I/Q demodulation |
| No-cycle latency operation | Eliminates pipeline delay; first conversion result available immediately after CNV falling edge - essential for closed-loop control timing |
| Flexible analog input modes | Supports fully differential, pseudo-differential bipolar, and pseudo-differential unipolar without hardware reconfiguration or digital register writes |
| Guaranteed 14-bit no missing codes | Valid across full –40°C to +125°C range - removes need for post-production linearity correction in harsh-environment applications |
| Integrated low-drift reference | 20 ppm/°C max drift over temperature eliminates external reference IC, reducing BOM count and layout area in space-constrained modules |
Applications
| High-Speed Motor Control | Optical Network Monitoring |
|---|---|
Use Scenario: Real-time measurement of phase currents in 3-phase PMSM drives operating at >20 kHz PWM frequencies. IC Role / Device Role / Timing Role: Dual-channel simultaneous sampling captures instantaneous current pairs with sub-ns timing alignment to reject common-mode switching noise. Use Value: Enables field-oriented control (FOC) with <1 µs inter-channel skew, improving torque ripple suppression and efficiency at high RPM. | Use Scenario: Digitizing photodiode output voltages from wavelength-selective optical receivers in DWDM transceivers. IC Role / Device Role / Timing Role: High-SNR, low-latency ADC converts analog signal amplitude and distortion metrics for real-time BER estimation. Use Value: 80 dB SNR and –90 dB THD support accurate detection of low-level optical impairments (e.g., chromatic dispersion, polarization mode dispersion). |
| Automotive Battery Management | Industrial Imaging Sensor Interface |
Use Scenario: Cell voltage and temperature monitoring in high-voltage EV battery packs under thermal stress (–40°C to +85°C ambient, local hot spots to +125°C). IC Role / Device Role / Timing Role: Dual-channel acquisition of isolated cell voltage and thermistor voltage with integrated reference for ratiometric accuracy. Use Value: Guaranteed operation to +125°C junction temperature and ±1 LSB INL ensure SoC/SOH calculation fidelity without derating or recalibration. | Use Scenario: Interfacing with time-of-flight (ToF) or line-scan CMOS image sensors requiring synchronized dual analog outputs (e.g., pixel + reference level). IC Role / Device Role / Timing Role: Simultaneous sampling of sensor output and correlated double sampling (CDS) reference to cancel reset noise and fixed-pattern noise. Use Value: No-cycle latency and matched aperture delay (<500 ps) enable true CDS implementation, improving dynamic range by ≥12 dB. |
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 resolution, 5 Msps, no integrated reference, requires external 5 V reference; LVDS-only interface | Better resolution and speed but higher power (45 mW), no sleep mode, and stricter layout requirements for LVDS routing | Select when ENOB >14.5 is required and system can accommodate external reference and higher thermal load |
| ADS8860IRGET | 16-bit, 1 Msps, single-channel, internal 2.5 V reference, SPI-only CMOS interface, 65 µW sleep current | Lower speed, single-channel only, smaller package (16-pin QFN), no LVDS or simultaneous sampling capability | Select for cost-sensitive, lower-bandwidth applications where dual-channel sync is not required and board space is highly constrained |
Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2321HUFD-14#PBF uniquely balances 14-bit precision, dual-channel simultaneity, integrated reference, ultra-low sleep power (5 µW), and extended temperature rating - making it optimal for thermally demanding, phase-coherent industrial and automotive edge nodes.
Availability
LTC2321HUFD-14#PBF is available at Aetrix Electronics and suitable for high-speed motor control, optical network monitoring, automotive battery management, and industrial imaging sensor interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2321HUFD-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. 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-fidelity, high-throughput data acquisition in thermally demanding environments - emphasizing simultaneous dual-channel sampling, on-chip reference stability, and robust operation from –40°C to +125°C.
FAQ
What is the guaranteed operating temperature range for the LTC2321HUFD-14#PBF?
The LTC2321HUFD-14#PBF is specified for continuous operation from –40°C to +125°C ambient temperature, with junction temperature limits verified per absolute maximum ratings (TJMAX = 125°C). This H-grade qualification makes it suitable for under-hood automotive, downhole oil/gas, and industrial motor drive applications where thermal margins are critical. The LTC2321HUFD-14#PBF maintains all guaranteed specifications-including ±4 LSB INL and 2 Msps throughput-across this full range.
Does the LTC2321HUFD-14#PBF support simultaneous sampling of both channels?
Yes, the LTC2321HUFD-14#PBF performs true simultaneous sampling using independent sample-and-hold circuits for each channel, triggered by a single CNV falling edge. This architecture ensures inter-channel aperture delay matching of ≤500 ps, preserving phase relationships between signals-essential for applications like three-phase current measurement and I/Q signal acquisition. The device outputs results sequentially via separate SDO1/SDO2 lines, not interleaved.
Can the internal reference of the LTC2321HUFD-14#PBF be disabled for use with an external reference?
Yes, the internal reference buffers (REFOUT1 and REFOUT2) can be disabled by grounding the REFINT pin (Pin 28). When disabled, the REFOUT1/2 pins accept external references from 1.25 V to VDD (max 5.25 V), allowing system-level ratiometric designs or higher-precision external references. The device retains full functionality-including 14-bit no-missing-codes guarantee-with external reference, provided proper decoupling and noise isolation are implemented.
What are the power consumption modes of the LTC2321HUFD-14#PBF and their typical values?
The LTC2321HUFD-14#PBF offers three operational states: active (33 mW/channel at 2 Msps, 5 V), nap (7.8 mW at 5 V, conversion complete), and sleep (5 µW total, both VDD and OVDD). Sleep mode disables all analog circuitry and serial interface, retaining only wake-up capability via CNV. These modes are controlled via dedicated control sequences and require no external components-enabling dynamic power scaling in battery-backed or energy-harvested edge sensors.
Is the LTC2321HUFD-14#PBF pin-compatible with other variants in the LTC2321 family?
Yes, all LTC2321-x variants-including LTC2321CUFD-14#PBF (0°C to 70°C), LTC2321IUFD-14#PBF (–40°C to 85°C), and LTC2321HUFD-14#PBF (–40°C to 125°C)-share identical 28-lead QFN (UFD) packaging, pinout, and electrical interface. The only difference is the guaranteed temperature range and associated screening; no PCB redesign or firmware change is required when upgrading from C/I to H grade for enhanced thermal robustness.
LTC2321HUFD-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 ~ 125°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321HUFD-14#PBF FAQ
1.How can I place an order for LTC2321HUFD-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321HUFD-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 LTC2321HUFD-14#PBF reliable?
The price and inventory of LTC2321HUFD-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 LTC2321HUFD-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2321HUFD-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321HUFD-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321HUFD-14#PBF?
LTC2321HUFD-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321HUFD-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 LTC2321HUFD-14#PBF?
For technical support, including LTC2321HUFD-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321HUFD-14#PBF requirements.
6.How does Aetrix verify that LTC2321HUFD-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2321HUFD-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 LTC2321HUFD-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2321HUFD-14#PBF?
All LTC2321HUFD-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321HUFD-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 LTC2321HUFD-14#PBF part is unused and in its original packaging.
Return procedure for LTC2321HUFD-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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