Analog Devices Inc. LTC2358CLX-16#PBF

Overview

LTC2358CLX-16#PBF from Analog Devices is a 16-bit, 8-channel simultaneous-sampling SAR ADC with buffered differential inputs, ±10.24V input range, 200ksps per channel throughput, and integrated 4.096V reference buffer. It operates from ±15V analog supplies and 5V digital supply, supports CMOS/LVDS serial interfaces, and targets high-voltage industrial data acquisition systems requiring wide common-mode range and rail-to-rail overdrive tolerance.

For engineers reviewing the LTC2358CLX-16#PBF datasheet, LTC2358CLX-16#PBF pinout, LTC2358CLX-16#PBF application, or LTC2358CLX-16#PBF equivalent, key selection criteria include per-channel SoftSpan configuration (±10.24V/0–10.24V/±5.12V/0–5.12V), 94.2dB SNR, ±1LSB INL, 128dB CMRR, and 48-lead LQFP package compatibility with industrial temperature range (0°C to 70°C).

Technical Context

The LTC2358CLX-16#PBF implements an 8-channel simultaneous sampling architecture using independent picoamp-input analog buffers per channel, enabling true differential operation with 30V_P-P common-mode range (VEE + 4V to VCC – 4V). Its SoftSpan™ technology allows per-conversion range selection without hardware reconfiguration.

It integrates a 4.096V reference buffer (REFBUF) with 13kΩ input impedance and supports dual serial I/O modes: SPI CMOS (1.8V–5V OVDD) with configurable lane count (1–8 SDO lines), and LVDS with differential clock/data pairs. Internal conversion clock eliminates cycle latency, and power-down mode reduces current to 0.68μA.

Key Specifications

Pinout & Package

48-lead (7mm × 7mm) plastic LQFP package (LX), RoHS-compliant, with exposed pad for thermal enhancement. Pinout validated per Analog Devices LTC2358-16 datasheet Rev A.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD7606C-16 and ADS8688, the LTC2358CLX-16#PBF uniquely combines per-channel SoftSpan configurability, 200ksps/channel simultaneous throughput, LVDS interface for noise immunity, and 94.2dB SNR - making it optimal for high-fidelity, multi-range industrial monitoring where timing coherence and dynamic range are critical.

Availability

LTC2358CLX-16#PBF is available at Aetrix Electronics and suitable for programmable logic controllers, industrial process control systems, and power line monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for LTC2358CLX-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 since 1965.

The LTC2358 product line was designed specifically for high-accuracy, high-channel-count industrial data acquisition-emphasizing simultaneous sampling, wide input voltage range, robust noise immunity, and flexible digital interfacing in harsh environments.

FAQ

What is the operating temperature range for the LTC2358CLX-16#PBF?

The LTC2358CLX-16#PBF is rated for 0°C to 70°C ambient operation, as indicated by the 'C' grade suffix. This makes it suitable for commercial and light-industrial environments where extended temperature extremes are not required. The device maintains specified performance-including ±1LSB INL and 94.2dB SNR-across this full range, with parameters such as zero-scale error drift (±4μV/°C) and full-scale error drift (±2.5ppm/°C) tightly controlled.

Does the LTC2358CLX-16#PBF support both CMOS and LVDS digital interfaces simultaneously?

No, the LTC2358CLX-16#PBF supports either CMOS or LVDS serial interface mode-not both concurrently. Interface selection is determined by the LVDS/CMOS pin state at power-up: logic high selects LVDS, logic low selects CMOS. Once configured, the mode remains fixed until reset. CMOS mode supports OVDD from 1.71V to 5.25V and up to eight SDO lanes; LVDS mode requires OVDD ≥ 2.375V and uses differential SCKI/SDO pairs with 100Ω termination.

How does the SoftSpan feature work on the LTC2358CLX-16#PBF?

The SoftSpan feature on the LTC2358CLX-16#PBF allows each of the eight analog input channels to be independently configured-on a per-conversion basis-for one of eight input ranges: ±10.24V, 0–10.24V, ±5.12V, 0–5.12V, ±12.5V, 0–12.5V, ±6.25V, or 0–6.25V. Range selection is controlled via dedicated configuration bits in the command word sent during each conversion cycle, enabling dynamic adaptation to varying sensor output levels without hardware changes or external multiplexing.

Can the LTC2358CLX-16#PBF operate with external reference sources?

Yes, the LTC2358CLX-16#PBF supports external reference operation via the REFIN pin. When REFIN is driven with a stable 1.25V to 2.2V source, the internal reference buffer (REFBUF) is disabled, and the ADC uses the external voltage scaled by the SoftSpan configuration. For example, applying 2.048V to REFIN yields ±10.24V full-scale range (×5 gain). This mode is essential for systems requiring traceable metrology references or tighter temperature stability than the internal 4.096V buffer provides.

What is the significance of the 128dB CMRR specification for the LTC2358CLX-16#PBF?

The 128dB CMRR (common-mode rejection ratio) at 200Hz means the LTC2358CLX-16#PBF attenuates 200Hz common-mode interference-such as 50/60Hz power-line coupling or ground-loop noise-by a factor of ~4 million. This enables accurate differential measurements in electrically noisy industrial settings without requiring matched external resistor networks or guard traces, directly improving signal fidelity in applications like motor current sensing or isolated sensor interfaces.