Analog Devices Inc. LTC2355CMSE-14#PBF

Overview

LTC2355CMSE-14#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 3.5 Msps serial successive-approximation ADC with differential inputs, 3.3V single-supply operation, and integrated 2.5V bandgap reference. It delivers 74.2 dB SINAD at 100 kHz, 80 dB common-mode rejection, and operates in a 10-lead MSOP package. It is used in high-speed portable data acquisition where low power, small size, and differential noise immunity are critical.

For engineers reviewing the LTC2355CMSE-14#PBF datasheet, LTC2355CMSE-14#PBF pinout, LTC2355CMSE-14#PBF application, or LTC2355CMSE-14#PBF equivalent, key selection considerations include its 3.5 Msps sampling rate with 39 ns acquisition time, Sleep mode (13 µW), Nap mode (4 mW), SPI-compatible 3-wire interface, and 0 V to 2.5 V unipolar differential input range referenced to internal VREF.

Technical Context

The LTC2355CMSE-14#PBF implements a fully differential sample-and-hold architecture that accepts AIN+ and AIN– inputs with common-mode swing from 0 V to VDD (3.3 V) and differential span of 0 V to 2.5 V. Its timing logic synchronizes conversion on the rising edge of CONV and outputs 14-bit data over SDO during 16 SCK cycles, supporting full throughput at 63 MHz clock frequency.

It features three power states: Active (5.5 mA), Nap (1.1 mA), and Sleep (4 µA), entered via specific CONV pulse sequences without SCK activity. The internal 2.5 V reference has ±15 ppm/°C tempco and can be overdriven by an external 2.55 V to VDD reference, enabling precision scaling or improved noise performance.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE) with exposed pad (Pin 11), rated for 0°C to 70°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and AD7960BCPZ-RL7, the LTC2355CMSE-14#PBF uniquely balances 14-bit precision, 3.5 Msps throughput, sub-20 mW power, and integrated reference in a 10-lead MSOP - making it optimal for space- and energy-constrained portable DAQ and motor control.

Availability

LTC2355CMSE-14#PBF is available at Aetrix Electronics and suitable for communications baseband monitoring, portable data acquisition systems, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC2355CMSE-14#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 LTC2355 family was designed by Linear Technology (acquired by ADI in 2017) to deliver high-speed, low-power, precision SAR ADC performance in miniature packages for portable and space-constrained instrumentation applications.

FAQ

What is the maximum sampling rate of the LTC2355CMSE-14#PBF, and what clock frequency is required?

The LTC2355CMSE-14#PBF achieves a maximum sampling rate of 3.5 Msps. To sustain this rate, the SCK clock must run at ≥63 MHz, with two additional clock cycles allocated for acquisition time between consecutive conversions. At lower SCK frequencies, the effective throughput decreases proportionally due to longer conversion + acquisition periods.

Does the LTC2355CMSE-14#PBF require an external reference, or does it have an internal one?

The LTC2355CMSE-14#PBF includes a factory-trimmed 2.5 V internal bandgap reference (Pin 3, VREF) with ±15 ppm/°C tempco. It does not require an external reference for basic operation. However, the VREF pin can be overdriven with an external 2.55 V to 3.3 V reference to improve accuracy, stability, or noise performance in demanding applications.

How does the Sleep mode of the LTC2355CMSE-14#PBF work, and how is it activated?

Sleep mode reduces the LTC2355CMSE-14#PBF's supply current to 4 µA (13 µW). It is activated by applying four or more rising edges on the CONV pin while holding SCK static (high or low). Wake-up occurs on the first SCK rising edge after Sleep entry, with VREF settling in 2 ms - a delay that must be accounted for in low-duty-cycle sampling systems.

What is the analog input voltage range specification for the LTC2355CMSE-14#PBF?

The LTC2355CMSE-14#PBF accepts a differential input range of 0 V to 2.5 V (unipolar) between AIN+ and AIN–. Both inputs must remain within the common-mode range of 0 V to VDD (3.3 V). Exceeding either limit causes saturation: output code = 0x0000 for <0 V differential, or 0x3FFF for >2.5 V differential.

Can the LTC2355CMSE-14#PBF interface directly with a standard SPI microcontroller?

Yes - the LTC2355CMSE-14#PBF uses a 3-wire SPI-compatible interface (CONV, SCK, SDO) with no chip-select line. CONV replaces the typical CS# function: a rising edge initiates conversion and data output begins on the subsequent SCK edges. SDO is three-state, allowing bus sharing. No level-shifting is needed for 3.3 V MCU I/O.