Analog Devices Inc. LTC2345IUK-16#TRPBF

Overview

LTC2345IUK-16#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, octal-channel simultaneous-sampling SAR ADC with differential SoftSpan™ inputs, 200ksps per channel throughput, ±1.25LSB INL, 91dB SNR, and integrated 4.096V reference buffer. It operates from a 5V supply, supports CMOS (1.8V–5V) and LVDS serial interfaces, and is rated for –40°C to +85°C industrial operation - ideal for high-precision multichannel data acquisition in PLCs and medical imaging systems.

For engineers reviewing the LTC2345IUK-16#TRPBF datasheet, LTC2345IUK-16#TRPBF pinout, LTC2345IUK-16#TRPBF application, or LTC2345IUK-16#TRPBF equivalent, key selection criteria include per-channel SoftSpan range configurability (±4.096V/0–4.096V/±2.048V/0–2.048V), 102dB CMRR at 200Hz, rail-to-rail input overdrive tolerance, and guaranteed no missing codes at 16 bits across temperature.

Technical Context

The LTC2345IUK-16#TRPBF implements an 8-channel simultaneous sampling architecture using independent SAR conversion engines per channel, each with programmable SoftSpan input ranges selected via SPI register writes. Its analog front-end features wide common-mode input range (0V to VDD) and 102dB CMRR, enabling direct digitization of bipolar, unipolar, and fully differential signals without external level-shifting circuitry.

Digital interface flexibility includes pin-selectable CMOS (1.8V–5V I/O) or LVDS output modes, with 1–8 parallel data lanes in CMOS mode to scale throughput versus bus width. Internal conversion clock eliminates cycle latency, and the integrated reference buffer (4.096V, ±5ppm/°C TC) reduces BOM count while maintaining ±0.025% full-scale accuracy.

Key Specifications

Pinout & Package

48-lead 7mm × 7mm QFN package (UK) with exposed thermal pad (Pin 49 = GND). All GND pins (15, 16, 17, 18, 20, 30, 41, 44, 45, 46, 49) must be soldered to a solid ground plane for optimal noise performance and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multichannel SAR ADC applications.

Compared with AD7606C-16 and ADS8688, the LTC2345IUK-16#TRPBF uniquely combines per-channel SoftSpan configurability, LVDS/CMOS dual-interface support, and 102dB CMRR - making it optimal for mixed-signal industrial systems where input signal diversity, EMI resilience, and timing integrity are co-constrained.

Availability

LTC2345IUK-16#TRPBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and medical imaging equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 13485 and IEC 61508 compliance.

Supply support for LTC2345IUK-16#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC2345IUK-16#TRPBF belongs to Linear's precision SAR ADC product line, engineered specifically for high-channel-count, high-accuracy data acquisition in electrically noisy industrial environments where simultaneous sampling, flexible input scaling, and robust reference integrity are mandatory.

FAQ

What is the operating temperature range of the LTC2345IUK-16#TRPBF?

The LTC2345IUK-16#TRPBF is specified for industrial operation from –40°C to +85°C. This grade ('I' suffix) is validated across the full range for parameters including INL (±1.25LSB), SNR (≥87.2dB), and CMRR (≥84dB), ensuring reliable performance in factory-floor and outdoor control cabinets without thermal derating.

Does the LTC2345IUK-16#TRPBF require an external reference?

No, the LTC2345IUK-16#TRPBF includes an integrated 2.048V bandgap reference (REFIN) and a buffered 4.096V master reference (REFBUF). External bypassing with a 0.1µF capacitor on REFIN and 47µF on REFBUF is required, but no external reference IC is needed unless higher initial accuracy or lower temperature coefficient is required.

How does the SoftSpan feature work on the LTC2345IUK-16#TRPBF?

The SoftSpan feature on the LTC2345IUK-16#TRPBF allows each of the eight channels to be independently configured via SPI register writes for ±4.096V, 0–4.096V, ±2.048V, or 0–2.048V input ranges on a per-conversion basis - enabling dynamic adaptation to varying sensor outputs without hardware changes or multiplexing delays.

Can the LTC2345IUK-16#TRPBF interface directly with an FPGA using LVDS?

Yes, the LTC2345IUK-16#TRPBF supports pin-selectable LVDS serial output with differential voltage swing of 275–425mV and common-mode voltage of 1.1–1.3V. It meets ANSI TIA/EIA-644-A LVDS specifications and requires only 100Ω differential termination at the FPGA receiver - no level-shifting or AC-coupling is needed.

What is the power consumption of the LTC2345IUK-16#TRPBF in active and power-down modes?

In active CMOS mode (200ksps, 8 channels), the LTC2345IUK-16#TRPBF draws 15.3mA from VDD and 1.8mA from OVDD, totaling 81mW typical. In power-down mode, it consumes just 0.33mW (65µA on VDD, 1µA on OVDD), with a 200ms wake-up time required for REFBUF stabilization before valid conversions resume.