Analog Devices Inc. DC2222A-C

Overview

LTC2512-24 from Analog Devices (formerly Linear Technology) is a 24-bit successive approximation register (SAR) analog-to-digital converter with integrated configurable digital filter, operating from a single 2.5V supply and supporting ±VREF differential input range up to 5.1V reference. It delivers dual simultaneous outputs: a 24-bit low-noise filtered code (117dB DR at 50ksps) and a 22-bit no-latency composite code (14-bit differential + 8-bit common-mode), in a 24-lead 7mm × 4mm DFN package. It is used in high-accuracy seismic data acquisition systems requiring ultra-low INL (±1ppm typ) and relaxed anti-aliasing.

For engineers reviewing the LTC2512-24 datasheet, LTC2512-24 pinout, LTC2512-24 application, or LTC2512-24 equivalent, key selection considerations include its dual-output architecture, pin-strappable down-sampling factor (4–32), guaranteed 24-bit no-missing-codes performance, SPI-compatible 1.8V–5V I/O, and synchronization capability across multiple devices via SYNC pin.

Technical Context

The LTC2512-24 implements a charge redistribution SAR core followed by a configurable flat-passband digital lowpass filter that performs decimation and noise shaping. Its dual-output path separates high-precision filtered data (SDOA) from real-time composite data (SDOB), enabling concurrent high-resolution measurement and fast control-loop feedback.

Filter configuration is set by SEL0/SEL1 pins, selecting down-sampling factors of 4, 8, 16, or 32 - directly determining output data rate (400ksps to 50ksps) and dynamic range (108dB to 117dB). Synchronization across multiple devices is achieved via the dedicated SYNC input, aligning digital filter phases without external timing coordination.

Key Specifications

Pinout & Package

Package: 24-lead plastic DFN (7mm × 4mm), exposed pad (Pin 25) connected to GND and required to be soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution SAR ADC applications.

Compared with ADS127L01 and AD7768-1, the LTC2512-24 uniquely combines true SAR architecture (no latency, no idle tones), pin-configurable digital filtering, and simultaneous high-precision + real-time outputs - making it optimal for hybrid measurement-and-control systems where both accuracy and responsiveness are mandatory.

Availability

LTC2512-24 is available at Aetrix Electronics and suitable for seismic monitoring, energy exploration instrumentation, and automated test equipment requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across temperature.

Supply support for LTC2512-24 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, automotive, and healthcare markets.

The LTC2512-24 belongs to ADI's precision data acquisition product line, designed specifically for applications demanding metrology-grade linearity, ultra-low noise, and flexible digital filtering - such as geophysical sensing, calibration infrastructure, and high-end test systems.

FAQ

What is the maximum sampling frequency of the LTC2512-24?

The LTC2512-24 supports a maximum sampling frequency of 1.6Msps. At this rate, the no-latency 22-bit output (SDOB) is fully available, while the 24-bit filtered output (SDOA) operates at up to 400ksps depending on the selected down-sampling factor. The device maintains guaranteed 24-bit no-missing-codes performance across its entire operating range, including at 1.6Msps acquisition.

How does the digital filter configuration affect the LTC2512-24's dynamic range and output data rate?

The LTC2512-24's digital filter down-sampling factor (DF) is set by SEL0/SEL1 pins and directly trades off output data rate against dynamic range: DF=4 yields 400ksps and 108dB DR; DF=8 gives 200ksps and 111dB; DF=16 gives 100ksps and 114dB; DF=32 gives 50ksps and 117dB. All configurations maintain the same 24-bit resolution and ±1ppm INL.

Can the LTC2512-24 operate with different reference voltages, and how does that impact LSB size?

Yes, the LTC2512-24 accepts reference voltages from 2.5V to 5.1V. LSB size scales linearly with VREF: at 5.0V reference, LSB = 596nV; at 2.5V, LSB = 298nV. This allows users to match input signal amplitude to full-scale range while preserving 24-bit resolution and maintaining >110dB DR across the supported VREF range.

What is the function of the SYNC pin on the LTC2512-24, and how is it used in multi-device systems?

The SYNC pin on the LTC2512-24 provides asynchronous phase alignment of the internal digital filter across multiple devices. A rising edge on SYNC resets the filter state, ensuring coherent sampling and synchronized output timing - critical for multi-channel systems like phased-array seismometers or synchronized ATE channels. No external clock distribution is required.

Does the LTC2512-24 require external anti-aliasing filters, and how does its digital filter relax those requirements?

The LTC2512-24's integrated digital lowpass filter significantly relaxes analog anti-aliasing requirements. With DF=32, its effective Nyquist bandwidth is ~25kHz, allowing use of simple first-order RC filters instead of steep 8th-order analog filters. This reduces component count, board area, and phase distortion - while still meeting stringent alias rejection specs due to the filter's flat passband and sharp roll-off.