Analog Devices Inc. LTC2355IMSE-12#PBF

Overview

LTC2355IMSE-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 3.5 Msps serial successive-approximation ADC with differential inputs, 3.3V single-supply operation, 71.1 dB SINAD at 100 kHz, and 80 dB common-mode rejection. It features an internal 2.5V bandgap reference, Sleep mode (13 µW), Nap mode (4 mW), and operates across –40°C to +85°C in a 10-lead MSOP package - ideal for portable high-speed data acquisition systems.

For engineers reviewing the LTC2355IMSE-12#PBF datasheet, LTC2355IMSE-12#PBF pinout, LTC2355IMSE-12#PBF application, or LTC2355IMSE-12#PBF equivalent, key selection considerations include its 3.5 Msps sampling rate with 39 ns acquisition time, SPI-compatible 3-wire interface timing, unipolar 0 V to 2.5 V differential input range, and low-power shutdown modes for battery-constrained embedded signal chains.

Technical Context

The LTC2355IMSE-12#PBF implements a fully differential sample-and-hold front-end paired with a 12-bit SAR core, enabling rejection of ground-loop noise and common-mode interference up to 100 MHz. Its timing logic synchronizes conversion start (CONV↑) with a 16-cycle SCK-driven serial output sequence, supporting full 3.5 Msps throughput when two extra clock cycles are allocated between conversions.

It integrates a factory-trimmed 2.5 V bandgap reference with ±15 ppm/°C tempco and supports external overdrive (2.55 V to VDD). Input voltage compliance spans 0 V to VDD on both AIN+ and AIN–, while differential swing is strictly limited to 0 V to 2.5 V - ensuring monotonicity and no missing codes across temperature.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE) with exposed pad (Pin 11), rated for –40°C to +85°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.

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 LTC2355IMSE-12#PBF delivers optimal balance of speed (3.5 Msps), ultra-low sleep power (13 µW), integrated reference, and compact MSOP packaging - making it uniquely suitable for space- and energy-constrained portable DAQ where 12-bit fidelity is sufficient.

Availability

LTC2355IMSE-12#PBF is available at Aetrix Electronics and suitable for portable data acquisition systems, uninterruptible power supplies, and multiphase motor control applications requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term production continuity.

Supply support for LTC2355IMSE-12#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 LTC2355IMSE-12#PBF belongs to ADI's legacy Linear Technology precision data converter portfolio, designed specifically for high-speed, low-power, single-supply applications where differential input noise immunity and small-footprint integration are critical.

FAQ

What is the maximum sampling rate of the LTC2355IMSE-12#PBF and what clock frequency is required?

The LTC2355IMSE-12#PBF achieves a maximum sampling rate of 3.5 Msps. This requires a 63 MHz SCK clock when two additional clock cycles are allowed after the 16-bit data stream for acquisition time between conversions. At lower rates, slower clocks may be used without performance loss, as analog performance is guaranteed down to 15.872 ns minimum SCK period (≈63 MHz).

Does the LTC2355IMSE-12#PBF require an external reference voltage?

No, the LTC2355IMSE-12#PBF includes a factory-trimmed 2.5 V internal bandgap reference with ±15 ppm/°C tempco. The VREF pin (Pin 3) must be bypassed with ≥10 µF capacitance to ground. An external reference (2.55 V to VDD) may optionally overdrive VREF for improved accuracy or calibration traceability - but it is not required for basic operation of the LTC2355IMSE-12#PBF.

How does the Sleep mode of the LTC2355IMSE-12#PBF operate and what is its wake-up time?

Sleep mode is entered after four or more CONV pulses with SCK held static (high or low), reducing supply current to 4 µA and total power to 13 µW. Wake-up occurs on the first SCK rising edge, initiating VREF re-stabilization. The internal reference settles in 2 ms (with 10 µF load), after which valid conversions resume - meaning the LTC2355IMSE-12#PBF is fully operational within 2 ms of wake-up.

What are the absolute voltage limits for AIN+ and AIN– on the LTC2355IMSE-12#PBF?

Per Absolute Maximum Ratings, AIN+ and AIN– must remain within –0.3 V to (VDD + 0.3 V), i.e., –0.3 V to 3.6 V for VDD = 3.3 V. However, for proper linear operation, the differential voltage (AIN+ – AIN–) must stay within 0 V to 2.5 V, and the common-mode voltage on each input must stay between 0 V and VDD. Exceeding these functional ranges causes saturation (all zeros or all ones) but does not damage the LTC2355IMSE-12#PBF.

Can the LTC2355IMSE-12#PBF interface directly with a microcontroller GPIO without level-shifting?

Yes - the LTC2355IMSE-12#PBF digital interface (CONV, SCK, SDO) is compatible with 3.3 V CMOS and TTL logic levels: VIH = 2.4 V min, VIL = 0.6 V max at VDD = 3.3 V. When interfaced with a 3.3 V microcontroller, no level-shifting is needed. For 1.8 V or 5 V controllers, level translation is required on all three signal lines to avoid violating input voltage ratings of the LTC2355IMSE-12#PBF.