Analog Devices Inc. LTC2321IUFD-12#PBF

Overview

LTC2321IUFD-12#PBF from Analog Devices is a dual-channel, 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 for high-speed data acquisition in industrial control and optical networking systems.

For engineers reviewing the LTC2321IUFD-12#PBF datasheet, LTC2321IUFD-12#PBF pinout, LTC2321IUFD-12#PBF application, or LTC2321IUFD-12#PBF equivalent, key selection considerations include guaranteed 12-bit no-missing-codes performance, wide input common mode range (0 V to VDD), zero-cycle latency operation, and −40°C to +85°C industrial temperature rating.

Technical Context

The LTC2321IUFD-12#PBF implements two independent SAR ADC cores with shared timing control, each sampling differentially across AIN1± and AIN2± with 13-bit two's complement output resolution (12-bit + sign). Its internal reference buffers deliver stable 4.096 V outputs (REFOUT1/REFOUT2) with ≤20 ppm/°C drift and support external reference override via REFINT pin.

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 deterministic SDO timing. Conversion is initiated by CNV falling edge, achieving 220 ns conversion time and 500 ns minimum cycle time with zero latency between sample and readout.

Key Specifications

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.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel SAR ADC applications.

Compared with AD7903BRUZ and ADS8860IRGET, the LTC2321IUFD-12#PBF uniquely combines 2 Msps dual-channel throughput, LVDS/CMOS flexibility, and 0 V–VDD common mode range-enabling compact, noise-immune designs in high-speed industrial and communications systems without sacrificing precision or thermal robustness.

Availability

LTC2321IUFD-12#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical networking monitoring, and multiphase motor control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2321IUFD-12#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 series belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for applications demanding simultaneous sampling, low latency, and robust operation in electrically noisy, thermally demanding environments.

FAQ

What is the maximum sampling rate supported by the LTC2321IUFD-12#PBF?

The LTC2321IUFD-12#PBF supports a maximum sampling rate of 2 Msps per channel, with a minimum conversion cycle time of 500 ns. This rate is achievable in both CMOS and LVDS interface modes and is guaranteed across the full −40°C to +85°C operating temperature range specified for the I-grade part.

Does the LTC2321IUFD-12#PBF require an external reference voltage?

No, the LTC2321IUFD-12#PBF includes an onboard low-drift (≤20 ppm/°C) 4.096 V temperature-compensated reference buffer on both REFOUT1 and REFOUT2 pins. External reference is optional: grounding REFINT disables the internal buffers, allowing 1.25 V–5 V external references to be applied directly to REFOUT1/REFOUT2.

How does the LTC2321IUFD-12#PBF handle pseudo-differential unipolar inputs?

The LTC2321IUFD-12#PBF supports pseudo-differential unipolar operation without configuration: connect signal to AIN1+ and ground to AIN1−. The device digitizes the 0 V to REFOUT1 range into 0x0000–0x0FFF codes (12-bit unipolar span), retaining over/under-range detection capability per its 13-bit two's complement output format.

What is the purpose of the CMOS/LVDS pin (Pin 25) on the LTC2321IUFD-12#PBF?

The CMOS/LVDS pin (Pin 25) configures the digital interface mode: grounded for CMOS (single-ended SDO/SCK), tied to OVDD for standard LVDS (differential signaling), or left floating for low-power LVDS. This pin determines driver strength, termination requirements, and power consumption of the serial interface.

Can the LTC2321IUFD-12#PBF operate from a 3.3 V supply?

Yes, the LTC2321IUFD-12#PBF is fully specified for operation from a 3.3 V VDD supply (3.13 V–3.47 V range), delivering 2 Msps throughput, 73 dB SNR, and ±0.5 LSB INL. At 3.3 V, typical power dissipation is 37 mW per channel in CMOS mode and 52 mW in LVDS mode.