Analog Devices Inc. LTC2328HMS-16#PBF

Overview

LTC2328HMS-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 1 Msps successive approximation register (SAR) analog-to-digital converter with pseudo-differential inputs and true bipolar ±10.24V input range. It delivers 93.5 dB SNR, ±1.5 LSB INL (max), and no missing codes at 16 bits, operating from a single 5 V supply with integrated 2.048 V reference and reference buffer. It is engineered for high-voltage industrial data acquisition requiring wide dynamic range and low distortion.

For engineers reviewing the LTC2328HMS-16#PBF datasheet, LTC2328HMS-16#PBF pinout, LTC2328HMS-16#PBF application, or LTC2328HMS-16#PBF equivalent, key selection criteria include guaranteed operation to +125°C, SPI-compatible daisy-chain interface supporting 1.8–5 V I/O, zero-cycle latency, internal conversion clock, and nap/sleep power management (50 mW typical / 300 µW sleep).

Technical Context

The LTC2328HMS-16#PBF implements a charge-redistribution SAR architecture with a 16-bit CDAC and differential comparator, sampling the attenuated/level-shifted pseudo-differential input (IN+, IN–) during acquisition and performing binary-weighted voltage comparisons against VREFBUF/2ⁿ during conversion. Its internal oscillator eliminates external timing dependencies, and the onboard reference buffer provides 4.096 V output from the 2.048 V bandgap reference.

It supports three reference configurations: internal reference + internal buffer (±10.24 V range), externally overdriven REFIN + internal buffer (±6.25 V to ±12 V), or externally overdriven REFBUF with REFIN grounded (±6.25 V to ±12.5 V). The 7 MHz –3 dB input linear bandwidth and 4 psRMS aperture jitter enable high-fidelity signal capture up to Nyquist.

Key Specifications

Pinout & Package

Package: 16-lead plastic MSOP (3 mm × 4.9 mm, 0.5 mm pitch), thermally enhanced with exposed pad (not electrically connected per datasheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7960BCPZ-RL7 and ADS8860IDRCT, the LTC2328HMS-16#PBF uniquely integrates true ±10.24 V bipolar input, internal 2.048 V reference + buffer, and guaranteed +125°C operation in a single 16-lead MSOP-reducing bill-of-materials, layout complexity, and qualification effort for industrial and automotive test systems.

Availability

LTC2328HMS-16#PBF is available at Aetrix Electronics and suitable for industrial process control, high-speed data acquisition, and automotive test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2328HMS-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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.

The LTC2328 family was designed specifically for high-accuracy, high-speed industrial and instrumentation applications demanding true bipolar input, low noise, and extended temperature reliability-addressing gaps left by generic SAR ADCs in harsh-environment signal chains.

FAQ

What is the maximum operating temperature rating for the LTC2328HMS-16#PBF?

The LTC2328HMS-16#PBF is rated for operation from –40°C to +125°C, making it suitable for under-hood automotive, downhole oil & gas, and industrial motor drive applications. This H-grade qualification is explicitly defined in the Absolute Maximum Ratings table and confirmed across all electrical specifications marked with the "l" symbol in the datasheet.

Does the LTC2328HMS-16#PBF require an external reference, or does it include one?

The LTC2328HMS-16#PBF includes a factory-trimmed 2.048 V bandgap reference and a 2× gain reference buffer delivering 4.096 V at REFBUF. This enables immediate operation with ±10.24 V input range. External references may optionally overdrive REFIN (1.25–2.4 V) or REFBUF (2.5–5 V) for improved accuracy or different input ranges-but are not required for basic functionality.

How does the nap mode function in the LTC2328HMS-16#PBF, and what power savings does it provide?

The LTC2328HMS-16#PBF automatically enters nap mode between conversions when idle, reducing supply current from 16 mA (1 Msps, typical) to 10 mA (conversion done state) and further to 0.4 mA in nap mode. At lower sampling rates, average power scales linearly-e.g., at 100 ksps, typical dissipation drops to ~5 mW. Sleep mode reduces current to 300 µA for deep power-down.

Can multiple LTC2328HMS-16#PBF devices be synchronized for simultaneous sampling?

Yes-the LTC2328HMS-16#PBF supports hardware-synchronized sampling via shared CNV and BUSY signals. In daisy-chain mode (CHAIN = high), multiple devices can share one SCK and CNV line while maintaining independent SDO outputs or cascading data. The absence of pipeline delay ensures deterministic, cycle-accurate alignment across channels without software compensation.

What is the input impedance and recommended drive capability for the IN+ and IN– pins of the LTC2328HMS-16#PBF?

The LTC2328HMS-16#PBF analog inputs present a 2 kΩ Thevenin-equivalent resistance (from resistor divider network) and 45 pF sampling capacitance. For optimal performance-especially at full 1 Msps-a low-output-impedance buffer (e.g., LT1468) is recommended to settle the 45 pF load within the 460 ns acquisition window and minimize distortion. Direct connection is acceptable only for low-impedance, DC-coupled sources.