Analog Devices Inc. LTC2321HUFD-14#TRPBF

Overview

LTC2321HUFD-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 single 3.3 V or 5 V supply and supports CMOS or LVDS serial interface for high-speed data acquisition in automotive and industrial control systems.

For engineers reviewing the LTC2321HUFD-14#TRPBF datasheet, LTC2321HUFD-14#TRPBF pinout, LTC2321HUFD-14#TRPBF application, or LTC2321HUFD-14#TRPBF equivalent, key selection criteria include guaranteed no-missing-codes operation at 14 bits, –40°C to +125°C extended temperature range, low-power nap/sleep modes (5 µW), wide input common mode range (0 V to VDD), and dual-channel simultaneous sampling capability.

Technical Context

The LTC2321HUFD-14#TRPBF implements two independent SAR ADC cores sharing a common reference architecture and clocking system. Each channel features fully differential input sampling with 10 pF input capacitance and 15 Ω switch on-resistance, enabling high-fidelity acquisition of bipolar, pseudo-differential, or unipolar signals without external configuration.

Its timing architecture delivers true no-cycle latency conversion: a falling edge on CNV initiates hold-and-convert, and digital output begins shifting on the first SCK falling edge after conversion completion. The device supports skew-matched CLKOUT output synchronized to SDO for jitter-immune FPGA/DSP interfacing in high-density PCB layouts.

Key Specifications

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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7960BCPZ-RL7 and ADS8860IRGET, the LTC2321HUFD-14#TRPBF uniquely balances 14-bit precision, dual-channel simultaneity, integrated reference, LVDS/CMOS flexibility, and ultra-low sleep power - making it optimal for space- and power-constrained embedded control systems requiring guaranteed operation to 125°C.

Availability

LTC2321HUFD-14#TRPBF is available at Aetrix Electronics and suitable for high-speed motor control, automotive battery monitoring, and industrial data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

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

The LTC2321HUFD-14#TRPBF belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for demanding real-time control and instrumentation applications requiring simultaneous dual-channel acquisition, low latency, and robust operation in harsh thermal environments.

FAQ

What is the operating temperature range of the LTC2321HUFD-14#TRPBF?

The LTC2321HUFD-14#TRPBF is rated for –40°C to +125°C operation (H-grade), validated across this full range for parameters including INL, SNR, and reference stability. This makes the LTC2321HUFD-14#TRPBF suitable for under-hood automotive applications and industrial motor drives where ambient temperatures exceed 105°C.

Does the LTC2321HUFD-14#TRPBF support both CMOS and LVDS digital interfaces?

Yes, the LTC2321HUFD-14#TRPBF supports both CMOS and LVDS serial I/O via the CMOS/LVDS pin (Pin 25): grounding selects CMOS mode, tying to OVDD enables standard LVDS, and leaving it floating activates low-power LVDS. Both modes use the same SCK/SDO/CLKOUT pin pairs but differ in drive strength, termination, and power consumption.

Can the LTC2321HUFD-14#TRPBF operate with an external reference?

Yes, the LTC2321HUFD-14#TRPBF can use an external reference by grounding the REFINT pin (Pin 28), which disables both internal REFOUT1 and REFOUT2 buffers. External references between 1.25 V and VDD (max 5.25 V) may then be applied directly to REFOUT1 and REFOUT2 pins, enabling custom full-scale ranges or improved reference performance.

What is the significance of "no-cycle latency" in the LTC2321HUFD-14#TRPBF?

No-cycle latency means the LTC2321HUFD-14#TRPBF outputs conversion results immediately after conversion completes - with zero pipeline delay. Unlike pipelined or sigma-delta ADCs, there is no fixed number of clock cycles between CNV trigger and first valid SDO bit, enabling deterministic timing essential for fast feedback loops in motor control and power conversion systems using the LTC2321HUFD-14#TRPBF.

How does the LTC2321HUFD-14#TRPBF handle pseudo-differential input configurations?

The LTC2321HUFD-14#TRPBF natively supports pseudo-differential bipolar (e.g., AIN1+ = VREF/2, AIN1– = signal) and unipolar (e.g., AIN1– = GND, AIN1+ = signal) modes without external switches or configuration registers. Its wide common mode range (0 V to VDD) and high CMRR (85 dB) ensure accurate digitization while rejecting noise common to both inputs - a core capability built into the LTC2321HUFD-14#TRPBF analog front-end.