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Analog Devices Inc. LTC2321CUFD-16#TRPBF
- Part No.:
- LTC2321CUFD-16#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321CUFD-16#TRPBF.pdf
- Description:
- IC ADC 16BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,894
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Product details
Overview
LTC2321CUFD-16#TRPBF from Analog Devices is a dual, 16-bit, 2 Msps successive approximation register (SAR) analog-to-digital converter with differential inputs, ±4 LSB typical INL, 81 dB SNR at 500 kHz, and integrated 4.096 V temperature-compensated reference. It operates from a single 3.3 V or 5 V supply, supports CMOS or LVDS serial interface, and targets high-speed data acquisition in instrumentation and optical networking.
For engineers reviewing the LTC2321CUFD-16#TRPBF datasheet, LTC2321CUFD-16#TRPBF pinout, LTC2321CUFD-16#TRPBF application, or LTC2321CUFD-16#TRPBF equivalent, key selection considerations include guaranteed 16-bit no-missing-codes operation, wide input common mode range (0 V to VDD), low-power nap/sleep modes (5 µW), and dual-channel simultaneous sampling with no cycle latency.
Technical Context
The LTC2321CUFD-16#TRPBF implements two independent SAR ADC cores sharing a common reference architecture and clock control logic. Each channel achieves 2 Msps throughput with zero-cycle latency and aperture jitter of 1 ps RMS, enabling precise time-aligned sampling for multiphase motor control and imaging.
Its dual reference buffers (REFOUT1/REFOUT2) deliver 4.096 V ±0.2% with ≤20 ppm/°C drift, and internal LDOs power VBYP1/VBYP2 (1.6 V nominal). The CMOS/LVDS mode select pin (Pin 25) configures digital I/O for 1.8 V–2.5 V logic or differential signaling with 100 Ω termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees full 65,536-code dynamic range without missing codes across temperature. |
| Sampling Rate | 2 Msps per channel - enables real-time capture of signals up to 10 MHz linear bandwidth. |
| INL (Typ) | ±4 LSB - ensures <0.06% end-point linearity error for precision measurement systems. |
| SNR (Typ) | 81 dB at fIN = 500 kHz - delivers >13.4 effective number of bits (ENOB) for high-fidelity signal digitization. |
| Power (Typ) | 31 mW per channel at 5 V - supports thermally constrained embedded designs with active cooling not required. |
| Reference | 4.096 V internal, 20 ppm/°C max drift - eliminates external reference component count and layout sensitivity. |
| Interface | SPI-compatible CMOS or LVDS - provides noise-immune serial output for FPGA/DSP interfacing over >10 cm traces. |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN with exposed pad (Pin 29 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (1, 8) | Analog power supply | Single 3.3 V or 5 V rail powers both ADC cores and reference buffers; requires local 10 µF + 0.1 µF bypassing. |
| AIN1+, AIN1– (6, 7); AIN2+, AIN2– (2, 3) | Differential analog inputs | Each pair accepts ±4.096 V differential swing with 0 V to VDD common mode range; no configuration needed for unipolar/bipolar signals. |
| CNV (9) | Conversion start trigger | Falling edge initiates sample-and-hold and conversion; requires low-jitter source synchronized to system timing domain. |
| SDO1+/–, SDO2+/– (15–16, 19–20) | Channel 1 & 2 serial data outputs | Differential LVDS or single-ended CMOS outputs; MSB-first, falling-edge clocked; support FPGA direct connection without level shifters. |
| SCK+/– (21–22) | Serial clock input | Accepts single-ended CMOS or differential LVDS clock; 64 MHz max frequency enables full 2 Msps readout with margin. |
| REFOUT1/2 (12, 26) | Reference buffer outputs | 4.096 V buffered references for each channel; decoupled with 10 µF + 0.1 µF capacitors directly at pins. |
| CMOS/LVDS (25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS - configures drive strength and termination requirements. |
| REFINT (28) | Reference enable/disable | Tie to VDD for internal reference; tie to GND to disable buffers and use external 1.25 V–5 V reference. |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Enables phase-coherent acquisition across two channels for motor current sensing or I/Q demodulation without inter-channel skew. |
| No cycle latency | Each CNV edge triggers immediate conversion and readout - eliminates pipeline delay for closed-loop control timing predictability. |
| Wide input common mode range | 0 V to VDD allows direct interface to op-amp outputs, sensor bridges, or industrial transducers without level-shifting circuitry. |
| Low-power nap/sleep modes | Reduces total current to 5 µW in sleep mode - extends battery life in portable test equipment and remote monitoring nodes. |
| LVDS or CMOS configurable I/O | Eliminates need for external serializer/deserializer ICs; supports long-trace, noise-immune communication in dense PCB layouts. |
Applications
| High-Speed Data Acquisition | Optical Networking |
|---|---|
Use Scenario: Real-time digitization of multi-channel sensor arrays in automated test equipment with sub-ns timing alignment. IC Role / Device Role / Timing Role: Dual-channel SAR ADC providing simultaneous 2 Msps sampling with zero-latency readout for time-of-flight or phase-difference analysis. Use Value: Eliminates external sample-hold circuits and reduces BOM count by integrating reference and configurable I/O, lowering system cost and board area. | Use Scenario: Monitoring laser bias current and photodiode feedback in coherent optical transceivers operating at 10+ Gbps. IC Role / Device Role / Timing Role: Precision analog front-end digitizing DC-biased RF envelope signals with 81 dB SNR to support adaptive equalization algorithms. Use Value: Internal 4.096 V reference stability (≤20 ppm/°C) ensures consistent gain calibration across temperature, reducing firmware compensation overhead. |
| Multiphase Motor Control | Communications Baseband |
Use Scenario: Simultaneous current and voltage sensing on three-phase inverter legs for field-oriented control in industrial drives. IC Role / Device Role / Timing Role: Dual ADC capturing phase currents with matched aperture delay (<500 ps) to preserve vector accuracy during PWM switching transitions. Use Value: Guaranteed 16-bit no-missing-codes operation ensures resolution integrity across torque ripple measurements, improving motor efficiency mapping. | Use Scenario: Digitizing baseband I/Q signals in software-defined radio receivers requiring high dynamic range and low distortion. IC Role / Device Role / Timing Role: High-SNR ADC delivering 81 dB SNR and –90 dB THD to preserve EVM performance in 256-QAM modulation schemes. Use Value: Differential input architecture with 85 dB CMRR rejects common-mode noise from shared power rails, enhancing receiver sensitivity in compact RF modules. |
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 |
|---|---|---|---|
| AD7606C-16 | 8-channel, parallel/serial interface, ±10 V input range, 1 MSPS per channel, no integrated reference | Better suited for multi-sensor DAQ with parallel bus host; lacks LVDS option and dual-channel simultaneity guarantee | Select when channel count >2 and system uses parallel interface; requires external reference and driver amplifiers |
| ADS8860 | Single-channel, 1 MSPS, SPI-only CMOS, 2.5 V supply only, no internal reference | Lower power (15 mW), smaller package (16-pin WQFN), but no dual-channel or LVDS capability | Select for space-constrained, single-signal monitoring where LVDS noise immunity is unnecessary |
Compared with AD7606C-16 and ADS8860, the LTC2321CUFD-16#TRPBF uniquely combines dual-channel simultaneity, integrated 4.096 V reference, LVDS/CMOS configurability, and 2 Msps throughput - making it optimal for time-critical, noise-sensitive dual-signal acquisition where board space and BOM count are constrained.
Availability
LTC2321CUFD-16#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical networking modules, and multiphase motor control applications requiring stable component supply, extended temperature validation, and long-term production continuity.
Supply support for LTC2321CUFD-16#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. 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 is designed for precision, high-speed data acquisition in thermally demanding environments - emphasizing low-noise SAR architecture, integrated references, and flexible digital interfaces for seamless FPGA/DSP integration.
FAQ
What is the operating temperature range of the LTC2321CUFD-16#TRPBF?
The LTC2321CUFD-16#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). Its absolute maximum junction temperature is 125°C, and thermal resistance θJA is 43°C/W. This rating is confirmed in the "ORDER INFORMATION" table and "ABSOLUTE MAXIMUM RATINGS" section of the official datasheet Rev. D.
Does the LTC2321CUFD-16#TRPBF require an external reference?
No, the LTC2321CUFD-16#TRPBF includes two onboard 4.096 V temperature-compensated reference buffers (REFOUT1 and REFOUT2) with ≤20 ppm/°C drift. An external reference is optional and enabled only when REFINT (Pin 28) is grounded, allowing input voltages from 1.25 V to 5 V.
How does the CMOS/LVDS pin (Pin 25) affect interface configuration for the LTC2321CUFD-16#TRPBF?
Pin 25 configures the digital I/O interface: grounding selects CMOS mode (single-ended, 1.8 V–2.5 V logic levels); tying to OVDD selects standard LVDS mode (differential, 100 Ω termination); leaving floating enables low-power LVDS mode. This setting determines drive strength, termination, and power consumption of SDO/CLKOUT/SCK lines.
Can the LTC2321CUFD-16#TRPBF perform simultaneous sampling on both channels?
Yes, the LTC2321CUFD-16#TRPBF supports true simultaneous sampling via a shared CNV signal that triggers both ADC cores identically. Aperture delay matching is specified at ≤500 ps, ensuring phase coherence critical for I/Q signal processing and motor current vector analysis.
What power-saving modes does the LTC2321CUFD-16#TRPBF support, and what are their current draws?
The LTC2321CUFD-16#TRPBF offers Nap Mode (2.55–5 mA) and Sleep Mode (1–5 µA), both reducing total supply current significantly versus active operation (11.8–15 mA at 2 Msps). These modes are entered via control register writes and maintain state retention, enabling rapid wake-up (<10 ms REFOUT stabilization).
LTC2321CUFD-16#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:
- 16
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321CUFD-16#TRPBF FAQ
1.How can I place an order for LTC2321CUFD-16#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321CUFD-16#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 LTC2321CUFD-16#TRPBF reliable?
The price and inventory of LTC2321CUFD-16#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2321CUFD-16#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2321CUFD-16#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321CUFD-16#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321CUFD-16#TRPBF?
LTC2321CUFD-16#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321CUFD-16#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 LTC2321CUFD-16#TRPBF?
For technical support, including LTC2321CUFD-16#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321CUFD-16#TRPBF requirements.
6.How does Aetrix verify that LTC2321CUFD-16#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2321CUFD-16#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 LTC2321CUFD-16#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2321CUFD-16#TRPBF?
All LTC2321CUFD-16#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321CUFD-16#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 LTC2321CUFD-16#TRPBF part is unused and in its original packaging.
Return procedure for LTC2321CUFD-16#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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