Analog Devices Inc. LTC2321HUFD-12#PBF

Overview

LTC2321HUFD-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 operation up to 125°C. It integrates dual low-drift (20 ppm/°C max) internal references (2.048 V or 4.096 V), supports CMOS or LVDS serial interface, and targets high-speed data acquisition in harsh environments.

For engineers reviewing the LTC2321HUFD-12#PBF datasheet, LTC2321HUFD-12#PBF pinout, LTC2321HUFD-12#PBF application, or LTC2321HUFD-12#PBF 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 timing, and thermal robustness across –40°C to +125°C.

Technical Context

The LTC2321HUFD-12#PBF employs a dual SAR architecture with independent sample-and-hold circuits per channel, enabling simultaneous sampling and zero-latency conversion. Its differential input stage accepts ±REFOUT1,2 (±4.096 V or ±2.048 V) full-scale ranges while maintaining 85 dB CMRR at 2.2 MHz and 10 MHz –3 dB input linear bandwidth.

It features a flexible digital interface: CMOS or LVDS mode selectable via the CMOS/LVDS pin, with skew-matched CLKOUT outputs for deterministic timing, and supports 64 MHz SCK (15.6 ns min period). Internal reference buffers are disableable via REFINT for external reference use (1.25 V to 5 V).

Key Specifications

Pinout & Package

Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed pad (Pin 29) soldered 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, high-speed SAR ADC applications.

Compared with AD7322BRUZ and ADS8862IDRCT, the LTC2321HUFD-12#PBF uniquely combines dual 2 Msps sampling, integrated low-drift reference, LVDS capability, and H-grade temperature support - making it the only option for thermally demanding, high-bandwidth, synchronized acquisition tasks.

Availability

LTC2321HUFD-12#PBF is available at Aetrix Electronics and suitable for high-speed motor control, optical network monitoring, and automotive battery management requiring stable component supply across extended temperature and long production lifecycles.

Supply support for LTC2321HUFD-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 LTC2321HUFD-12#PBF belongs to the Linear Technology (acquired by Analog Devices) high-speed precision SAR ADC family, designed specifically for applications demanding simultaneous sampling, low latency, and operation in extreme thermal environments.

FAQ

What is the maximum operating temperature for the LTC2321HUFD-12#PBF?

The LTC2321HUFD-12#PBF is rated for continuous operation from –40°C to +125°C (H-grade), with thermal shutdown protection and validated performance across this full range. Its 20 ppm/°C max reference drift and guaranteed 12-bit no-missing-codes behavior make it suitable for under-hood automotive and downhole oilfield applications where ambient temperatures exceed 105°C.

Does the LTC2321HUFD-12#PBF require external reference components?

No - the LTC2321HUFD-12#PBF integrates dual temperature-compensated reference buffers delivering either 2.048 V or 4.096 V, eliminating the need for external reference ICs or trimming resistors. The REFINT pin allows disabling these buffers if an external reference (1.25 V to 5 V) is preferred, but default operation is fully self-contained.

Can the LTC2321HUFD-12#PBF interface directly with an FPGA using LVDS?

Yes - the LTC2321HUFD-12#PBF supports native LVDS I/O: SCK+, SCK–, SDO1+/–, SDO2+/–, and CLKOUT+/– all comply with ANSI TIA/EIA-644-A. Each differential pair requires 100 Ω termination at the FPGA receiver, and the CMOS/LVDS pin (Pin 25) must be tied to OVDD to enable LVDS mode.

How does the LTC2321HUFD-12#PBF achieve zero-cycle latency?

The LTC2321HUFD-12#PBF achieves zero-cycle latency by outputting the conversion result immediately after the CNV falling edge - no pipeline registers or additional clock cycles are inserted. The timing diagram confirms that SDO data becomes valid within 2.5 ns of CLKOUT↓, enabling real-time feedback in servo loops and RF envelope detection without added delay.

What is the significance of the "+ sign" in the LTC2321HUFD-12#PBF's 12-bit + sign resolution?

The "+ sign" denotes a 13-bit two's complement output format: 1 sign bit + 12 magnitude bits. This yields 8192 positive and 8192 negative codes (–4096 to +4095), enabling seamless bipolar signal digitization (e.g., ±4.096 V) with inherent sign handling - unlike unsigned 12-bit converters requiring external offset subtraction.