Analog Devices Inc. LTC2356CMSE-12#TRPBF

Overview

LTC2356CMSE-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 3.5 Msps serial successive-approximation ADC with differential inputs, single 3.3V supply operation, ±1.25V bipolar input range, and 80 dB common-mode rejection. It delivers 71.1 dB SINAD at 100 kHz and draws only 5.5 mA active current - ideal for high-speed portable data acquisition and multiphase motor control systems requiring precision analog front ends in space-constrained designs.

For engineers reviewing the LTC2356CMSE-12#TRPBF datasheet, LTC2356CMSE-12#TRPBF pinout, LTC2356CMSE-12#TRPBF application, or LTC2356CMSE-12#TRPBF equivalent, key selection criteria include its 10-lead MSOP package, SPI-compatible 3-wire interface, Sleep mode (13 µW), Nap mode (4 mW), and guaranteed no missing codes over 0°C to 70°C industrial temperature range.

Technical Context

The LTC2356CMSE-12#TRPBF employs a fully differential sample-and-hold architecture that accepts AIN+ and AIN– inputs simultaneously, enabling true differential measurement independent of common-mode voltage (0 V to VDD). Its internal 2.5 V bandgap reference supports ±1.25 V input span and can be overdriven by an external 2.55 V to 3.3 V reference.

Conversion is triggered on the rising edge of CONV; output data appears on SDO over 16 clock cycles following that edge, compatible with standard SPI timing. Full 3.5 Msps throughput requires two additional clock cycles between conversions for acquisition, supported by a maximum 63 MHz SCK frequency and 39 ns acquisition time.

Key Specifications

Pinout & Package

Package: 10-lead plastic MSOP (MSE) with exposed thermal pad (Pin 11), rated for 0°C to 70°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 LTC2356CMSE-12#TRPBF uniquely balances 3.5 Msps speed, 12-bit precision, 3.3 V single-supply operation, integrated reference, and ultra-low Sleep power - making it optimal for embedded industrial systems where size, power, and interface simplicity are critical.

Availability

LTC2356CMSE-12#TRPBF is available at Aetrix Electronics and suitable for motor control, portable data acquisition, and uninterruptible power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for LTC2356CMSE-12#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.

The LTC2356 family was designed by Linear Technology (acquired by ADI in 2017) to deliver high-speed, low-power, small-footprint SAR ADCs for portable and space-constrained instrumentation - emphasizing ease of use, robust noise immunity, and minimal external component count.

FAQ

What is the operating temperature range for the LTC2356CMSE-12#TRPBF?

The LTC2356CMSE-12#TRPBF is specified for 0°C to 70°C ambient operation (Commercial grade, denoted by 'C' in part number). This range is validated across all electrical parameters including SINAD, INL, and power consumption. The device uses internal thermal protection and is rated for TJMAX = 125°C. For extended temperature applications, the 'I' grade variant LTC2356IMSE-12#TRPBF supports –40°C to 85°C.

Does the LTC2356CMSE-12#TRPBF require an external reference?

No - the LTC2356CMSE-12#TRPBF includes a factory-trimmed 2.5 V internal bandgap reference with ±15 ppm/°C tempco, enabling immediate operation with only a 10 µF bypass capacitor on VREF (Pin 3). However, the VREF pin can be overdriven by an external 2.55 V to 3.3 V reference for improved absolute accuracy or custom full-scale adjustment, as documented in the datasheet's Internal Reference Characteristics table.

How does the Sleep mode of the LTC2356CMSE-12#TRPBF activate and recover?

Sleep mode (13 µW) activates after four or more CONV pulses while SCK is held static (high or low); recovery requires one SCK pulse to re-enable the internal reference and sample-and-hold, followed by a 2 ms VREF settling time before valid conversions resume. During this wake-up period, the device remains responsive to CONV edges but outputs invalid data until VREF stabilizes - a behavior explicitly characterized in the Timing Characteristics table (Note 14).

Can the LTC2356CMSE-12#TRPBF interface directly with a 3.3 V microcontroller SPI port?

Yes - the LTC2356CMSE-12#TRPBF supports 3-wire SPI communication with TTL/3.3 V CMOS logic levels: VIH = 2.4 V min, VOL = 0.1 V max at 160 µA, and SDO is three-state. No level-shifting is needed. Its timing aligns with standard SPI masters: data is clocked out on SCK rising edges starting one cycle after CONV, and the interface tolerates arbitrary SCK periods - simplifying integration with ARM Cortex-M or RISC-V MCUs.

What is the maximum source impedance the LTC2356CMSE-12#TRPBF analog inputs can drive without external buffering?

The LTC2356CMSE-12#TRPBF analog inputs exhibit 13 pF total capacitance and draw only leakage current (<1 µA) during conversion, but require 39 ns acquisition time for full 3.5 Msps throughput. With source impedances above ~100 Ω, acquisition time increases significantly; therefore, direct connection is recommended only for low-impedance sources (e.g., op-amp outputs or transformer secondaries). For higher impedances, a buffer such as LT1813 or LT6200 is required to meet the 39 ns settling specification.