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Analog Devices Inc. LTC2321IUFD-14#TRPBF
- Part No.:
- LTC2321IUFD-14#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321IUFD-14#TRPBF.pdf
- Description:
- IC ADC 14BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,771
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Product details
Overview
LTC2321IUFD-14#TRPBF 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 a single 3.3 V or 5 V supply and supports CMOS or LVDS serial interface for high-speed data acquisition in industrial control and optical networking systems.
For engineers reviewing the LTC2321IUFD-14#TRPBF datasheet, LTC2321IUFD-14#TRPBF pinout, LTC2321IUFD-14#TRPBF application, or LTC2321IUFD-14#TRPBF equivalent, key selection criteria 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 operation across –40°C to +85°C.
Technical Context
The LTC2321IUFD-14#TRPBF implements two independent SAR ADC cores with fully differential sample-and-hold circuits, each supporting 8 VP-P differential input range and 10 MHz –3 dB input linear bandwidth. Its internal reference buffers deliver 2.048 V or 4.096 V outputs with ≤20 ppm/°C drift and are disableable via REFINT for external reference use.
It features dual-mode digital I/O: CMOS-compatible (1.8 V–2.5 V OVDD) or LVDS (100 Ω differential termination), with skew-matched CLKOUT+/- for jitter-critical timing. Conversion is initiated by CNV falling edge, with no-cycle latency and 220 ns conversion time, enabling deterministic real-time sampling in multiphase motor control and remote DAQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign (15-bit two's complement output), enabling full-scale digitization of ±REFOUT with overrange capability |
| Sampling Rate | 2 Msps per channel, supporting real-time capture of signals up to 10 MHz bandwidth without aliasing |
| INL | ±1 LSB typical, ensuring monotonicity and precision in closed-loop feedback applications |
| SNR | 80 dB typical at fIN = 500 kHz, delivering 13.0 effective bits for high-fidelity signal reconstruction |
| Power Dissipation | 33 mW per channel at 2 Msps (CMOS mode, 5 V), scalable to 5 µW in sleep mode for intermittent sensing |
| Operating Temp | –40°C to +85°C (I-grade), qualified for industrial and automotive under-hood environments |
| Reference | Internal 2.048 V / 4.096 V buffer, <20 ppm/°C drift, externally bypassable with 10 µF + 0.1 µF decoupling |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed pad (Pin 29) soldered 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 | Support fully differential, pseudo-differential bipolar/unipolar modes with 0 V to VDD common mode range-no configuration required |
| CNV (Pin 9) | Conversion start trigger | Falling-edge–sensitive input initiating hold-and-convert sequence; demands low-jitter clock source for timing accuracy |
| SCK+, SCK– (Pins 21, 22) | Serial clock input | Differential LVDS or single-ended CMOS clock input; defines SDO data shift rate (up to 64 MHz) |
| SDO1+/–, SDO2+/– (Pins 15–16, 19–20) | Channel 1 & 2 serial data outputs | MSB-first, 15-bit two's complement output; LVDS mode requires 100 Ω differential termination at receiver |
| CLKOUT+/– (Pins 17–18) | Skew-matched output clock | Provides phase-aligned clock to latch SDO at FPGA/CPLD, eliminating setup/hold uncertainty in high-speed interfaces |
| REFOUT1/2 (Pins 12, 26) | Reference buffer outputs | Nominally 4.096 V (or 2.048 V) buffered references; each referenced to its own REFRTN pin (Pins 11, 27) |
| REFINT (Pin 28) | Reference enable/disable | Tie to VDD for internal reference; ground to disable buffers and accept external 1.25 V–VDD reference on REFOUT pins |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes at 14 bits | Guaranteed monotonic transfer function eliminates code ambiguities in safety-critical control loops |
| Wide input common mode range (0 V to VDD) | Eliminates need for level-shifting circuitry when interfacing with op-amp drivers or sensor front-ends |
| CMOS or LVDS selectable I/O | Enables direct connection to either FPGA I/O banks (1.8 V/2.5 V) or high-speed LVDS receivers without level translators |
| Onboard 2.048 V / 4.096 V reference with ≤20 ppm/°C drift | Reduces BOM count and layout area while maintaining system-level accuracy over industrial temperature range |
| 5 µW sleep mode power | Extends battery life in portable DAQ systems and enables wake-on-event architectures with microcontroller coordination |
Applications
| High-Speed Data Acquisition | Optical Networking |
|---|---|
Use Scenario: Simultaneous sampling of multiple sensor channels (e.g., strain gauges, accelerometers) in automated test equipment with real-time FFT analysis. IC Role / Device Role / Timing Role: Dual-channel 2 Msps SAR ADC providing synchronized, low-latency digitization with no cycle delay for deterministic timestamping. Use Value: 80 dB SNR and ±1 LSB INL ensure accurate amplitude and phase measurement of dynamic signals up to 10 MHz bandwidth. | Use Scenario: Monitoring laser bias current and photodiode feedback in 100G coherent transceivers requiring precise analog telemetry. IC Role / Device Role / Timing Role: High-common-mode-rejection ADC digitizing differential current-sense signals amid noisy power rails and RF interference. Use Value: 85 dB CMRR and wide 0 V–VDD common mode range reject supply noise without external instrumentation amplifiers. |
| Multiphase Motor Control | Remote Industrial Sensing |
Use Scenario: Real-time current and voltage sampling in three-phase inverter drives for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Dual ADC capturing synchronized phase currents with sub-ns aperture matching to minimize torque ripple calculation error. Use Value: 500 ps aperture delay matching and 1 ps RMS jitter preserve phase coherence between CH1/CH2 for accurate vector math. | Use Scenario: Low-power environmental monitoring node measuring temperature, pressure, and vibration over LoRaWAN or NB-IoT links. IC Role / Device Role / Timing Role: Precision ADC operating in nap mode between triggered acquisitions, reducing average system power to <100 µW. Use Value: 5 µW sleep current and fast wake-up (<10 ms REFOUT stabilization) enable multi-year battery operation with periodic high-fidelity sampling. |
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 and driver | Better ENOB for metrology; lacks on-chip reference and LVDS option, increasing BOM and layout complexity | Select when absolute precision >16 bits is required and system can accommodate external reference design |
| ADS8860IDRCT | 16-bit, 1 Msps, single-channel, SPI-only CMOS interface, no LVDS or internal reference | Lower power (3.5 mW), smaller 3 mm × 3 mm WSON package; lacks dual-channel sync and wide common mode | Select for space-constrained, single-signal applications where dual-channel correlation is unnecessary |
Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2321IUFD-14#TRPBF uniquely balances 14-bit precision, dual-channel synchronization, integrated reference, and LVDS/CMOS flexibility-making it optimal for industrial DAQ and real-time control where BOM reduction and timing determinism are critical.
Availability
LTC2321IUFD-14#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical transceiver telemetry, and multiphase motor control applications requiring stable component supply across extended temperature ranges.
Supply support for LTC2321IUFD-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 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 for high-fidelity, low-latency data acquisition in demanding real-time systems-emphasizing noise performance, timing accuracy, and ease of integration through flexible I/O and integrated references.
FAQ
What is the operating temperature range for the LTC2321IUFD-14#TRPBF?
The LTC2321IUFD-14#TRPBF is rated for –40°C to +85°C (Industrial grade). This specification is guaranteed across all electrical parameters in the datasheet, including INL, SNR, and reference drift, making it suitable for deployment in factory automation, outdoor telecom infrastructure, and vehicle ECUs without derating.
Does the LTC2321IUFD-14#TRPBF require external reference components?
No-the LTC2321IUFD-14#TRPBF integrates two temperature-compensated reference buffers (2.048 V / 4.096 V) with ≤20 ppm/°C drift. Each REFOUT pin (12, 26) must be decoupled with 10 µF + 0.1 µF ceramics. External references are optional: grounding REFINT (Pin 28) disables internal buffers, allowing 1.25 V–VDD external sources on REFOUT pins.
How does the LTC2321IUFD-14#TRPBF support both CMOS and LVDS interfaces?
The LTC2321IUFD-14#TRPBF uses the CMOS/LVDS pin (Pin 25) to select interface mode: grounded for CMOS (1.8 V–2.5 V OVDD), tied to OVDD for LVDS, or floating for low-power LVDS. SCK, SDO, and CLKOUT pins auto-configure accordingly-no external resistors needed for CMOS, but 100 Ω differential termination is mandatory for LVDS operation.
What is the significance of "no-cycle latency" in the LTC2321IUFD-14#TRPBF?
No-cycle latency means the conversion result is available immediately after the CNV falling edge completes-there is zero dead time between conversions. For the LTC2321IUFD-14#TRPBF, this enables deterministic, back-to-back sampling at full 2 Msps rate, critical for real-time control loops and time-of-flight measurements where timing jitter directly impacts system accuracy.
Can the LTC2321IUFD-14#TRPBF digitize single-ended signals?
Yes-the LTC2321IUFD-14#TRPBF supports pseudo-differential unipolar and bipolar configurations without hardware changes. For single-ended signals, connect the reference (e.g., system ground or mid-rail) to AIN– and the signal to AIN+, leveraging the device's 0 V–VDD common mode range and 85 dB CMRR to reject shared noise-eliminating need for dedicated instrumentation amps.
LTC2321IUFD-14#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2321IUFD-14#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321IUFD-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 LTC2321IUFD-14#TRPBF reliable?
The price and inventory of LTC2321IUFD-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 LTC2321IUFD-14#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2321IUFD-14#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321IUFD-14#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321IUFD-14#TRPBF?
LTC2321IUFD-14#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321IUFD-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 LTC2321IUFD-14#TRPBF?
For technical support, including LTC2321IUFD-14#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321IUFD-14#TRPBF requirements.
6.How does Aetrix verify that LTC2321IUFD-14#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2321IUFD-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 LTC2321IUFD-14#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2321IUFD-14#TRPBF?
All LTC2321IUFD-14#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321IUFD-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 LTC2321IUFD-14#TRPBF part is unused and in its original packaging.
Return procedure for LTC2321IUFD-14#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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