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Analog Devices Inc. LTC2321IUFD-12#TRPBF
- Part No.:
- LTC2321IUFD-12#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321IUFD-12#TRPBF.pdf
- Description:
- IC ADC 12BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,870
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Product details
Overview
LTC2321IUFD-12#TRPBF from Analog Devices is a dual, 12-bit + sign successive approximation register (SAR) analog-to-digital converter with differential inputs, 2 Msps per channel throughput, ±0.5 LSB typical INL, 73 dB SNR at 500 kHz, and integrated 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.
For engineers reviewing the LTC2321IUFD-12#TRPBF datasheet, LTC2321IUFD-12#TRPBF pinout, LTC2321IUFD-12#TRPBF application, or LTC2321IUFD-12#TRPBF equivalent, key selection criteria include guaranteed no-missing-codes performance at 12 bits, wide input common mode range (0 V to VDD), zero-cycle latency operation, and −40°C to +85°C industrial temperature grade.
Technical Context
The LTC2321IUFD-12#TRPBF implements two independent SAR ADC cores sharing a common reference architecture and high-speed SPI-compatible serial interface. Each channel features fully differential sampling with 10 pF input capacitance and 15 Ω switch on-resistance, enabling flexible pseudo-differential unipolar/bipolar or true differential drive without external configuration.
Its timing architecture delivers zero-cycle latency: conversion starts on CNV falling edge, completes in 220 ns, and serial readout begins immediately via SCK-synchronized MSB-first output on SDO1/SDO2. CLKOUT provides skew-matched clock for receiver latch alignment in high-speed FPGA/DSP interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit + sign (13-bit two's complement output), enabling bipolar full-scale digitization of ±4.096 V differential input. |
| Sampling Rate | 2 Msps per channel - supports real-time capture of signals up to 10 MHz −3dB input bandwidth. |
| INL | ±0.5 LSB typical - ensures monotonicity and <1 LSB code transition error across full operating temperature range. |
| SNR | 73 dB typical at fIN = 500 kHz - enables >11.8 ENOB for precision measurement in noise-sensitive systems. |
| Reference | Internal 4.096 V ±0.2% buffered output with 20 ppm/°C max drift - eliminates external reference component and layout complexity. |
| Power | 30 mW per channel at 2 Msps (5 V supply, CMOS mode) - balances speed and efficiency for thermally constrained designs. |
| Temperature Range | −40°C to +85°C (I-grade) - qualified for industrial and automotive under-hood environments. |
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 integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 8) | Analog power supply | Accepts 3.3 V or 5 V; must be bypassed with 10 µF + 0.1 µF ceramics close to pins for low-noise operation. |
| AIN1+, AIN1− (Pins 7, 6); AIN2+, AIN2− (Pins 2, 3) | Differential analog inputs | Support ±4.096 V differential span with 0 V to VDD common mode range; no configuration needed for pseudo-differential or fully differential drive. |
| CNV (Pin 9) | Conversion start trigger | Falling-edge–activated; initiates sample-and-hold and conversion with zero-cycle latency - critical for deterministic timing in control loops. |
| REFOUT1, REFOUT2 (Pins 12, 26) | Internal reference outputs | Nominally 4.096 V; decoupled with 10 µF + 0.1 µF ceramics; disable via REFINT (Pin 28) to support external references from 1.25 V to 5 V. |
| SDO1+/−, SDO2+/− (Pins 15–16, 19–20) | Serial data outputs | LVDS or CMOS selectable; MSB-first, 13-bit two's complement output per channel - enables simultaneous dual-channel streaming to FPGA logic. |
| SCK+/− (Pins 21–22) | Serial clock input | Differential (LVDS) or single-ended (CMOS) clock input; supports up to 64 MHz SCK frequency for fast readout. |
| CLKOUT+/− (Pins 17–18) | Skew-matched output clock | Phase-aligned with SDO data edges - eliminates setup/hold timing margin concerns at receiver (e.g., FPGA I/O registers). |
| CMOS/LVDS (Pin 25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS - configures driver strength and termination requirements without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SAR cores | Enables synchronous sampling of two channels with matched aperture delay (<500 ps) - essential for phase-sensitive applications like motor current sensing. |
| Zero-cycle latency operation | Eliminates pipeline delay between CNV edge and first SDO bit - allows real-time feedback in closed-loop control systems without added jitter or phase shift. |
| Flexible analog input topology | Supports fully differential, pseudo-differential unipolar, and pseudo-differential bipolar modes without hardware reconfiguration - reduces BOM count and layout variants. |
| Integrated 4.096 V reference with 20 ppm/°C drift | Removes need for external precision reference IC and associated filtering components - improves system-level accuracy while reducing board area and cost. |
| Low-power sleep mode (5 µW) | Reduces idle power by >6000× vs active mode - extends battery life in portable instrumentation and enables rapid wake-up (<10 ms REFOUT stabilization) for burst-mode acquisition. |
Applications
| Motor Phase Current Sensing | Optical Network Monitoring |
|---|---|
|
Use Scenario: Real-time sampling of two-phase currents in three-phase inverter drives using shunt resistors and isolated amplifiers. IC Role / Device Role / Timing Role: Dual-channel synchronous ADC capturing AIN1 and AIN2 with matched aperture delay and zero-cycle latency to compute instantaneous torque and flux vectors. Use Value: Enables field-oriented control (FOC) with <1 µs inter-channel timing skew, supporting >20 kHz PWM switching frequencies without current reconstruction error. |
Use Scenario: Digitizing photodiode output voltages from wavelength-selective monitors in DWDM transceivers. IC Role / Device Role / Timing Role: High-SNR ADC converting low-amplitude, high-bandwidth optical signal derivatives with 73 dB SNR at 500 kHz to resolve sub-dB power fluctuations. Use Value: Delivers 11.8+ ENOB across −40°C to +85°C, ensuring stable gain calibration and BER monitoring without periodic recalibration. |
| Industrial Data Acquisition | Automotive Battery Management |
|
Use Scenario: Simultaneous voltage and temperature monitoring across 16-cell lithium-ion stacks using multiplexed front-end conditioning. IC Role / Device Role / Timing Role: Dual ADC channel used in time-interleaved mode to double effective sampling rate while maintaining DC accuracy via internal reference stability. Use Value: Achieves ±0.5 LSB INL over full temperature range, eliminating software linearization and reducing firmware validation effort. |
Use Scenario: Cell voltage acquisition in ASIL-B compliant BMS modules requiring redundancy and fault detection. IC Role / Device Role / Timing Role: Primary ADC for redundant cell voltage measurement path, leveraging built-in no-missing-codes guarantee and 125°C-rated H-grade variant compatibility. Use Value: Meets ISO 26262 diagnostic coverage requirements via deterministic conversion timing, monotonic transfer function, and internal reference self-test capability. |
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 |
|---|---|---|---|
| AD7322BRUZ | 12-bit dual SAR, 1 MSPS, ±10 V/±5 V/±2.5 V/0–10 V input ranges; external reference required; 16-lead TSSOP package. | Lacks integrated reference and LVDS interface; lower throughput limits control loop bandwidth. | Select when multi-range flexibility and legacy 3.3 V digital interface are prioritized over speed and integration. |
| ADS8862IDRCT | 16-bit single-channel SAR, 1 MSPS, 77 dB SNR; internal reference; SPI-only CMOS interface; 10-lead VSON package. | Single-channel only; higher resolution but half the throughput and no LVDS option for noise immunity. | Select when absolute precision >12-bit ENOB is required for static measurements, not high-speed dual-channel acquisition. |
Compared with AD7322BRUZ and ADS8862IDRCT, the LTC2321IUFD-12#TRPBF uniquely combines dual-channel 2 Msps operation, integrated low-drift reference, LVDS/CMOS interface selectability, and guaranteed no-missing-codes performance - making it optimal for space-constrained, high-dynamic-range industrial and automotive real-time systems.
Availability
LTC2321IUFD-12#TRPBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical network monitoring equipment, and industrial motor control platforms requiring stable component supply across extended temperature ranges.
Supply support for LTC2321IUFD-12#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 LTC2321IUFD-12#TRPBF belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for applications demanding simultaneous dual-channel sampling, low-latency timing, and robust operation in electrically noisy, thermally demanding environments.
FAQ
What is the operating temperature range for the LTC2321IUFD-12#TRPBF?
The LTC2321IUFD-12#TRPBF is rated for −40°C to +85°C (industrial I-grade), verified across all electrical specifications including INL, SNR, and reference drift. This range is explicitly defined in the Absolute Maximum Ratings table and confirmed in the Electrical Characteristics section under "l" (full temperature range) conditions.
Does the LTC2321IUFD-12#TRPBF require an external reference?
No - the LTC2321IUFD-12#TRPBF integrates a factory-trimmed, temperature-compensated 4.096 V reference buffer (REFOUT1/REFOUT2) with ≤20 ppm/°C drift. External reference use is optional and enabled only by grounding REFINT (Pin 28); default operation uses the internal reference.
Can the LTC2321IUFD-12#TRPBF interface directly with a 1.8 V FPGA I/O bank?
Yes - the LTC2321IUFD-12#TRPBF supports 1.8 V to 2.5 V OVDD, allowing direct CMOS-level connection to 1.8 V FPGA I/O. LVDS mode also operates at OVDD = 2.5 V, and the CMOS/LVDS pin (Pin 25) selects interface type without level-shifting circuitry.
What is the significance of "12-bit + sign" resolution in the LTC2321IUFD-12#TRPBF?
"12-bit + sign" means the LTC2321IUFD-12#TRPBF outputs a 13-bit two's complement code (B12–B0), where B12 is the sign bit. This enables full-scale digitization of ±4.096 V differential input (span = 2 × VREF) with 1 mV LSB size, preserving polarity information without separate offset calibration.
How does the zero-cycle latency feature benefit control loop design with the LTC2321IUFD-12#TRPBF?
Zero-cycle latency means the first SDO bit appears immediately after the CNV falling edge - no pipeline delay. For the LTC2321IUFD-12#TRPBF, this enables deterministic, jitter-free sampling aligned precisely to PWM edges in motor control, reducing phase lag and improving current-loop stability at high switching frequencies.
LTC2321IUFD-12#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:
- 12
- 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-12#TRPBF FAQ
1.How can I place an order for LTC2321IUFD-12#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321IUFD-12#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-12#TRPBF reliable?
The price and inventory of LTC2321IUFD-12#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-12#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2321IUFD-12#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321IUFD-12#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321IUFD-12#TRPBF?
LTC2321IUFD-12#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321IUFD-12#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-12#TRPBF?
For technical support, including LTC2321IUFD-12#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321IUFD-12#TRPBF requirements.
6.How does Aetrix verify that LTC2321IUFD-12#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2321IUFD-12#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-12#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2321IUFD-12#TRPBF?
All LTC2321IUFD-12#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321IUFD-12#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-12#TRPBF part is unused and in its original packaging.
Return procedure for LTC2321IUFD-12#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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