Analog Devices Inc. LTC2353ILX-18#PBF

Overview

LTC2353ILX-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, dual-channel simultaneous-sampling SAR ADC with buffered differential inputs, ±10.24V input range, 550ksps/ch throughput, and integrated 4.096V reference buffer. It operates from ±15V analog supplies and 5V digital supply, supports pin-selectable CMOS or LVDS serial interface, and targets high-voltage industrial data acquisition where common-mode rejection and picoamp input leakage are critical.

For engineers reviewing the LTC2353ILX-18#PBF datasheet, LTC2353ILX-18#PBF pinout, LTC2353ILX-18#PBF application, or LTC2353ILX-18#PBF equivalent, key selection criteria include guaranteed no-missing-codes at 18 bits, 124dB CMRR at 200Hz, ±3.5LSB INL over ±10.24V range, rail-to-rail input overdrive tolerance, and per-channel SoftSpan™ reconfigurable input ranges (±10.24V/0–10.24V/±5.12V/0–5.12V).

Technical Context

The LTC2353ILX-18#PBF implements a true simultaneous sampling architecture using two independent SAR cores with shared internal conversion clock and synchronized CNV control. Its picoamp-input analog buffers enable direct connection to high-impedance sources while maintaining 124dB CMRR and 96.4dB SNR in ±10.24V mode.

SoftSpan™ configuration is controlled per-conversion via SPI/LVDS command register, allowing dynamic range switching between bipolar and unipolar modes without hardware change. The device supports both CMOS (1.8V–5V OVDD) and LVDS I/O, with selectable one- or two-lane data output for throughput optimization.

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic LQFP package (LX) with exposed pad; thermal resistance θ_JA = 53°C/W. Pin functions validated per Linear Technology LTC2353-18 datasheet Rev. F.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606C-18 and ADS8900B, the LTC2353ILX-18#PBF uniquely combines simultaneous dual-channel operation, on-chip reference buffer, 124dB CMRR, and per-conversion SoftSpan™ range selection - making it optimal for space-constrained, high-EMI industrial systems requiring adaptive input scaling and synchronized acquisition.

Availability

LTC2353ILX-18#PBF is available at Aetrix Electronics and suitable for power line monitoring, industrial process control, and test and measurement applications requiring stable component supply, long-term lifecycle support, and guaranteed performance across –40°C to +85°C.

Supply support for LTC2353ILX-18#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2353 family was designed specifically for high-voltage, high-precision industrial data acquisition - emphasizing simultaneous sampling integrity, wide common-mode rejection, and robustness in electrically noisy environments.

FAQ

What is the operating temperature range for the LTC2353ILX-18#PBF?

The LTC2353ILX-18#PBF is rated for industrial temperature operation from –40°C to +85°C. This grade is confirmed in the order information table of the datasheet, distinguishing it from the C-grade (0°C to 70°C) and H-grade (–40°C to 125°C) variants. All electrical specifications in the datasheet marked with "l" apply across this full range.

Does the LTC2353ILX-18#PBF require an external reference voltage?

No, the LTC2353ILX-18#PBF includes an integrated 4.096V reference buffer (REFBUF) and internal 2.048V reference (VREFIN). When using the internal reference, REFIN is left unconnected or tied to GND, and REFBUF provides the buffered 4.096V output. An external reference can be applied to REFIN (1.25–2.2V range) if higher accuracy or custom scaling is needed, but it is not required for standard operation of the LTC2353ILX-18#PBF.

How does the SoftSpan™ feature work on the LTC2353ILX-18#PBF?

The SoftSpan™ feature on the LTC2353ILX-18#PBF allows per-conversion configuration of each channel's input range via SPI or LVDS command register. Valid settings include ±10.24V, 0–10.24V, ±5.12V, and 0–5.12V - all derived from the internal 4.096V reference. This eliminates hardware gain-switching components and enables dynamic adaptation to varying sensor output levels within a single acquisition sequence.

What is the maximum common-mode voltage the LTC2353ILX-18#PBF can handle?

The LTC2353ILX-18#PBF supports a 30V_P-P common-mode input range, with absolute input common-mode voltage specified from (VEE + 4V) to (VCC – 4V). For typical ±15V supplies (VCC = +15V, VEE = –15V), this yields a usable common-mode range of –11V to +11V - sufficient to reject noise from industrial motor drives and switch-mode power supplies without signal degradation.

Can the LTC2353ILX-18#PBF operate with only one channel enabled?

Yes, the LTC2353ILX-18#PBF supports single-channel operation, increasing throughput to 800ksps on the active channel. This is achieved by disabling one channel via the configuration register, reducing conversion time and power consumption. In single-channel mode, the device maintains full 18-bit resolution, ±3.5LSB INL, and all other specified dynamic performance parameters.