Analog Devices Inc. LTC2321HUFD-16#PBF

Overview

LTC2321HUFD-16#PBF 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 guaranteed no missing codes over –40°C to +125°C. It integrates dual 4.096 V temperature-compensated references, supports CMOS or LVDS serial I/O, and delivers 2 Msps per channel with zero cycle latency-ideal for high-speed motor control and optical networking data acquisition.

For engineers reviewing the LTC2321HUFD-16#PBF datasheet, LTC2321HUFD-16#PBF pinout, LTC2321HUFD-16#PBF application, or LTC2321HUFD-16#PBF equivalent, key selection criteria include guaranteed operation to 125°C, 8 V_P-P differential input range with wide common-mode support, low-power nap/sleep modes (5 µW), and dual-channel simultaneous sampling with matched aperture delay (≤500 ps).

Technical Context

The LTC2321HUFD-16#PBF implements two independent SAR ADC cores sharing a single reference architecture and clocking system, enabling true simultaneous sampling of two channels without inter-channel skew. Its internal 4.096 V reference buffer exhibits ≤20 ppm/°C drift and supports external reference override via REFINT pin grounding.

It features dual-mode digital interface: CMOS mode (1.8 V–2.5 V OVDD) or LVDS mode (2.5 V OVDD), with dedicated SDO1/SDO2 and CLKOUT1/CLKOUT2 differential pairs, and configurable SCK input (single-ended or differential). Conversion is initiated by CNV falling edge, with 220 ns conversion time and no pipeline latency.

Key Specifications

Pinout & Package

Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed pad (Pin 29 = GND), rated for –40°C to +125°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606C-16 and ADS8900B, the LTC2321HUFD-16#PBF uniquely delivers guaranteed simultaneous dual-channel 2 Msps sampling with LVDS noise immunity and ultra-low sleep current-making it optimal for thermally demanding, real-time control systems requiring phase coherence and EMI resilience.

Availability

LTC2321HUFD-16#PBF is available at Aetrix Electronics and suitable for high-speed motor control, optical network monitoring, and industrial data acquisition requiring stable component supply across extended temperature ranges.

Supply support for LTC2321HUFD-16#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.

The LTC2321HUFD-16#PBF belongs to the LTC2321 family of high-speed, precision SAR ADCs designed specifically for demanding real-time data acquisition in thermally extreme and noise-prone environments.

FAQ

What is the maximum operating temperature of the LTC2321HUFD-16#PBF?

The LTC2321HUFD-16#PBF is rated for continuous operation from –40°C to +125°C, with absolute maximum junction temperature of 125°C and thermal resistance θ_JA = 43°C/W. This H-grade qualification makes it suitable for under-hood automotive and industrial edge computing applications where ambient temperatures exceed 105°C.

Does the LTC2321HUFD-16#PBF support external reference inputs?

Yes, the LTC2321HUFD-16#PBF supports external references via REFOUT1 and REFOUT2 pins. When REFINT is grounded, the internal reference buffers are disabled, allowing an external voltage (1.25 V to 5 V) to drive these pins directly-enabling higher-precision or custom-ratio reference configurations.

How does the LVDS interface of the LTC2321HUFD-16#PBF improve noise immunity?

The LTC2321HUFD-16#PBF's LVDS interface uses differential signaling (SDO1+/–, CLKOUT+/–, SCK+/–) with 100 Ω termination, providing >30 dB common-mode noise rejection. This allows reliable high-speed data transfer (>64 MHz SCK) in electrically noisy environments such as motor drives or RF subsystems where CMOS interfaces would suffer bit errors.

What is the significance of "no cycle latency" in the LTC2321HUFD-16#PBF?

"No cycle latency" means the LTC2321HUFD-16#PBF outputs the conversion result for the CNV-triggered sample immediately after the readout phase-without pipeline delay. This enables deterministic, sub-microsecond feedback timing essential for real-time control loops, unlike pipelined or sigma-delta ADCs that introduce fixed or variable latency.

Can the LTC2321HUFD-16#PBF perform simultaneous sampling on both channels?

Yes, the LTC2321HUFD-16#PBF performs true simultaneous sampling using independent sample-and-hold circuits for AIN1 and AIN2. Aperture delay matching is ≤500 ps, ensuring phase coherence between channels-critical for applications like I/Q demodulation, power quality analysis, and multiphase motor current sensing.