Analog Devices Inc. LTC2389CUK-16#PBF

Overview

LTC2389CUK-16#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 2.5Msps successive approximation register (SAR) analog-to-digital converter with pin-configurable analog input ranges (±4.096V fully differential, 0–4.096V pseudo-differential unipolar, ±2.048V pseudo-differential bipolar), 96.0dB SNR (fully differential), ±1LSB INL (max), and integrated 4.096V reference. It operates from a single 5V supply and targets high-speed, wide-dynamic-range data acquisition in medical imaging and industrial instrumentation.

For engineers reviewing the LTC2389CUK-16#PBF datasheet, LTC2389CUK-16#PBF pinout, LTC2389CUK-16#PBF application, or LTC2389CUK-16#PBF equivalent, key selection criteria include guaranteed no missing codes at 16 bits, internal reference accuracy (±0.5% initial, ±20ppm/°C max), parallel/serial interface flexibility, 48-pin QFN package thermal performance (θJA = 29°C/W), and operation across 0°C to 70°C.

Technical Context

The LTC2389CUK-16#PBF implements a true SAR architecture with no pipeline delay or cycle latency, enabling deterministic timing for real-time control loops. Its conversion time is fixed at 245–310ns, synchronized by an internal oscillator-eliminating external clock jitter sensitivity and simplifying system timing design.

Pin configuration via MODE0, OB/2C, and PD/FD selects between three analog input topologies and corresponding output data formats (offset binary or two's complement), while A1 enables byte-swapping on the 16-bit parallel bus. The device supports 1.8V–5V I/O voltage (OVDD), allowing direct interfacing with modern low-voltage FPGAs and microcontrollers without level shifters.

Key Specifications

Pinout & Package

Package: 48-lead 7mm × 7mm plastic QFN (UK package) with exposed thermal pad (Pin 49 = GND). θJA = 29°C/W enables high throughput without forced air cooling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7960BCPZ-RL and ADS8860IDRCT, the LTC2389CUK-16#PBF uniquely combines pin-selectable analog input topologies, integrated reference + buffer, parallel/serial dual-interface flexibility, and 2.5Msps throughput in a thermally optimized 7×7mm QFN-making it optimal for mid-speed, multi-signal-chain instrumentation where design reuse and layout simplicity are critical.

Availability

LTC2389CUK-16#PBF is available at Aetrix Electronics and suitable for medical imaging systems, industrial process controllers, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed commercial-temperature grade performance.

Supply support for LTC2389CUK-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 technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2389-16 product line was designed for high-speed, high-accuracy data acquisition systems demanding low latency, flexible signal interfacing, and minimal external components-targeting applications where traditional pipeline ADCs introduce unacceptable delay or complexity.

FAQ

What input voltage ranges does the LTC2389CUK-16#PBF support, and how are they selected?

The LTC2389CUK-16#PBF supports three pin-configurable analog input ranges: ±4.096V fully differential, 0V to 4.096V pseudo-differential unipolar, and ±2.048V pseudo-differential bipolar. Selection is achieved using the OB/2C (Pin 6) and PD/FD (Pin 30) logic inputs, as defined in Table 2 of the datasheet. No external components are required to switch between these ranges-configuration is purely digital and occurs at power-up or runtime.

Does the LTC2389CUK-16#PBF require an external reference, or is one integrated?

The LTC2389CUK-16#PBF includes a precision internal 4.096V reference with ±0.5% initial accuracy and ±20ppm/°C maximum temperature coefficient. It also integrates a reference buffer, allowing direct connection of REFOUT to REFIN. An external reference may be used instead by driving REFIN with a stable 4.096V source, but it is not required-the internal reference enables full functionality with zero external components.

What is the significance of "no cycle latency" in the LTC2389CUK-16#PBF specification?

"No cycle latency" means the LTC2389CUK-16#PBF is a true SAR ADC with deterministic, single-cycle conversion behavior: the result of a CNVST-triggered conversion is available immediately after BUSY deasserts, with no pipeline registers or delayed output stages. This enables real-time, time-critical applications such as motor control feedback loops where output timing must be precisely predictable and bounded within 310ns maximum conversion time.

Can the LTC2389CUK-16#PBF interface directly with a 1.8V FPGA I/O bank?

Yes. The LTC2389CUK-16#PBF supports OVDD from 1.71V to 5.25V, and all digital I/O pins (D0–D15, CS, BUSY, etc.) are referenced to OVDD. When OVDD = 1.8V, the device outputs valid 1.8V logic levels and accepts 1.8V-compatible input thresholds (VIH = 0.8×OVDD = 1.44V, VIL = 0.2×OVDD = 0.36V), enabling direct connection to 1.8V FPGA I/O without level translators.

What thermal considerations apply to the LTC2389CUK-16#PBF in continuous 2.5Msps operation?

In continuous 2.5Msps operation, the LTC2389CUK-16#PBF dissipates 162.5mW and has a junction-to-ambient thermal resistance (θJA) of 29°C/W in its 48-lead QFN package. With ambient temperature at 70°C, junction temperature rises to approximately 70°C + (0.1625W × 29°C/W) = 70°C + 4.7°C = 74.7°C-well below the 125°C maximum junction temperature. Proper PCB layout with the exposed pad soldered to a solid ground plane is essential to maintain this thermal performance.