Analog Devices Inc. LTC2336CMS-18#PBF

Overview

LTC2336CMS-18#PBF from Analog Devices (formerly Linear Technology) is an 18-bit, 250ksps successive approximation register (SAR) analog-to-digital converter with fully differential, true bipolar ±10.24V inputs, 100dB SNR, ±4LSB INL max, and integrated 2.048V temperature-compensated reference. It operates from a single 5V supply and targets high-voltage industrial data acquisition where wide dynamic range and DC accuracy are critical.

For engineers reviewing the LTC2336CMS-18#PBF datasheet, LTC2336CMS-18#PBF pinout, LTC2336CMS-18#PBF application, or LTC2336CMS-18#PBF equivalent, key selection considerations include guaranteed 18-bit no-missing-codes operation, daisy-chain SPI interface compatibility across 1.8V–5V logic levels, internal conversion clock eliminating external timing constraints, and validated performance to 125°C in the H-grade variant.

Technical Context

The LTC2336CMS-18#PBF implements a charge redistribution SAR architecture with a 45pF sampling capacitor and 50Ω switch on-resistance, enabling 7MHz –3dB input linear bandwidth and 4ps aperture jitter. Its differential input stage uses resistor divider networks to level-shift ±10.24V signals to the ADC core's 0–4.096V range while maintaining common-mode rejection.

Conversion is initiated by a rising edge on CNV, triggering acquisition followed by a 1.9–3µs internal conversion phase with no pipeline delay or cycle latency. The onboard reference buffer delivers 4.096V (2×2.048V) to REFBUF, supporting ±5×REFBUF input ranges, and features 20ppm/°C max drift and 2.043–2.053V output tolerance over temperature.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP (3mm × 4.9mm), RoHS-compliant, surface-mountable with exposed pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and AD7606C-18BSTZ, the LTC2336CMS-18#PBF uniquely balances 18-bit DC accuracy, 250ksps throughput, integrated ±10.24V-compatible reference, and ultra-low 28mW active power - making it optimal for space-constrained, single-channel industrial DAQ nodes where thermal management and component count are critical.

Availability

LTC2336CMS-18#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and high-speed data acquisition requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for LTC2336CMS-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 LTC2336-18 belongs to ADI's precision SAR ADC product line, engineered for demanding industrial instrumentation applications requiring true bipolar input capability, low drift, and guaranteed 18-bit no-missing-codes performance across extended temperature ranges.

FAQ

What is the maximum operating temperature for the LTC2336CMS-18#PBF?

The LTC2336CMS-18#PBF is rated for 0°C to 70°C operation (C-grade). For extended temperature support, the LTC2336HMS-18#PBF variant is specified from –40°C to 125°C and shares identical pinout and functionality with the LTC2336CMS-18#PBF, enabling drop-in replacement in thermally demanding environments.

Does the LTC2336CMS-18#PBF require an external reference?

No, the LTC2336CMS-18#PBF includes a factory-trimmed 2.048V internal bandgap reference and a 2× gain reference buffer delivering 4.096V to REFBUF. This enables direct ±10.24V input operation without external components. An external reference can optionally overdrive REFIN (1.25–2.4V) for improved accuracy, but it is not required for basic functionality.

How does the daisy-chain mode work on the LTC2336CMS-18#PBF?

Daisy-chain mode is enabled by pulling CHAIN (Pin 10) high. In this mode, RDL/SDI becomes SDI, accepting serial data from the previous device in the chain, while SDO outputs the current device's 18-bit result plus upstream data. This allows multiple LTC2336CMS-18#PBF devices to share one SPI bus with minimal GPIO usage and synchronized CNV triggering.

What is the purpose of the VDDLBYP pin on the LTC2336CMS-18#PBF?

VDDLBYP (Pin 1) provides a regulated 2.5V supply derived internally from VDD, powering sensitive analog circuitry including the reference buffer and CDAC. It must be bypassed to GND with a 2.2µF ceramic capacitor to suppress noise and ensure stable reference performance - omitting this capacitor degrades SNR and increases INL error.

Can the LTC2336CMS-18#PBF interface directly with a 1.8V microcontroller?

Yes, the LTC2336CMS-18#PBF supports 1.8V logic levels via its OVDD pin (Pin 15). When OVDD = 1.8V, all digital I/O pins (CNV, BUSY, SCK, SDO, RDL/SDI, CHAIN) operate with VIH = 1.44V min and VIL = 0.36V max, enabling seamless, translator-free communication with 1.8V FPGAs or MCUs while maintaining full 250ksps throughput and timing compliance.