Analog Devices Inc. LTC2321CUFD-16#PBF

Overview

LTC2321CUFD-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 integrated 4.096 V temperature-compensated reference. It operates from a single 3.3 V or 5 V supply and delivers no missing codes over full 16-bit resolution-ideal for high-speed data acquisition in industrial instrumentation and optical networking.

For engineers reviewing the LTC2321CUFD-16#PBF datasheet, LTC2321CUFD-16#PBF pinout, LTC2321CUFD-16#PBF application, or LTC2321CUFD-16#PBF equivalent, key selection criteria include guaranteed 125°C operation (C-grade), LVDS/CMOS serial interface flexibility, 28-lead 4 mm × 5 mm QFN package, and low 31 mW/channel power dissipation at full throughput.

Technical Context

The LTC2321CUFD-16#PBF implements two independent SAR ADC cores with simultaneous sampling architecture, each featuring a 10 MHz –3 dB input linear bandwidth and 1 ps RMS aperture jitter. Its internal reference buffers support either 2.048 V or 4.096 V outputs with ≤20 ppm/°C drift, and the device maintains ±12 LSB INL over its 0°C to 70°C operating range.

It uses a skew-matched CLKOUT output synchronized to SDO data edges for deterministic timing, supports both CMOS and LVDS I/O modes via the CMOS/LVDS pin, and achieves no cycle latency-enabling real-time streaming without pipeline delay. The dual-channel architecture allows time-aligned conversion of two independent signals with <500 ps aperture delay matching.

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 performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel 16-bit SAR ADC applications.

Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2321CUFD-16#PBF uniquely combines dual-channel synchronization, integrated reference, LVDS/CMOS flexibility, and 2 Msps throughput in a single 4 mm × 5 mm QFN-reducing BOM count and layout complexity for time-critical industrial systems.

Availability

LTC2321CUFD-16#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical networking modules, and industrial instrumentation requiring stable component supply with guaranteed 0°C to 70°C operation and long-term production continuity.

Supply support for LTC2321CUFD-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, automotive, communications, and healthcare markets.

The LTC2321-16 product line delivers high-speed, high-accuracy dual-channel SAR ADCs optimized for applications demanding time-aligned sampling, low latency, and integrated precision references-targeting test & measurement, medical imaging, and advanced motor control.

FAQ

What is the maximum sampling rate supported by the LTC2321CUFD-16#PBF?

The LTC2321CUFD-16#PBF supports a maximum sampling rate of 2 Msps per channel, with simultaneous acquisition on both channels. This rate is maintained across its full operating temperature range (0°C to 70°C) and is compatible with both CMOS and LVDS interface modes. At this rate, the device achieves 81 dB SNR and ±4 LSB INL typical, enabling high-fidelity digitization of signals up to 10 MHz bandwidth.

Does the LTC2321CUFD-16#PBF require an external reference voltage?

No, the LTC2321CUFD-16#PBF includes an onboard low-drift 4.096 V temperature-compensated reference buffer. REFOUT1 and REFOUT2 pins provide this voltage directly, with ≤20 ppm/°C drift over temperature. An external reference may be used by grounding REFINT (Pin 28), allowing input ranges from 1.25 V to VDD-but the internal reference eliminates BOM cost and layout complexity for most applications.

How does the LTC2321CUFD-16#PBF handle differential versus pseudo-differential input configurations?

The LTC2321CUFD-16#PBF natively supports true differential, pseudo-differential unipolar, and pseudo-differential bipolar inputs without configuration. For true differential, apply complementary signals to AIN1+/AIN1–; for pseudo-differential, tie one input to a fixed voltage (e.g., VREF/2 or GND) and drive the other-its wide 0 V to VDD common mode range accommodates all cases while maintaining 85 dB CMRR at 500 kHz.

What power-saving modes are available on the LTC2321CUFD-16#PBF?

The LTC2321CUFD-16#PBF offers Nap Mode (2.55 mA typical) and Sleep Mode (5 µW typical), both entered via control of the CNV and interface signals. In Nap Mode, the ADC core remains ready for immediate conversion; in Sleep Mode, bias currents are minimized for extended idle periods. Both modes retain register settings and reference stability, enabling rapid wake-up without recalibration-ideal for battery-powered remote sensors.

Can the LTC2321CUFD-16#PBF interface directly with an FPGA using LVDS signaling?

Yes, the LTC2321CUFD-16#PBF supports direct LVDS interfacing with FPGAs. When CMOS/LVDS (Pin 25) is tied to OVDD, SDO1+/SDO1–, SDO2+/SDO2–, CLKOUT+/CLKOUT–, and SCK+/SCK– operate in LVDS mode. Each differential pair requires 100 Ω termination at the FPGA receiver, and the skew-matched CLKOUT ensures deterministic data capture without timing closure challenges at 2 Msps throughput.