Analog Devices Inc. LTC2351CUH-14#TRPBF

Overview

LTC2351CUH-14#TRPBF from Analog Devices (formerly Linear Technology) is a 14-bit, 1.5Msps simultaneous-sampling ADC with six differential input channels, 75dB SINAD, 83dB CMRR, and 250ksps throughput per channel. It operates from a single 3V supply, draws only 5.5mA active current, and supports unipolar (0V–2.5V) or bipolar (±1.25V) differential inputs-ideal for multiphase power measurement and motor control systems requiring synchronized acquisition.

For engineers reviewing the LTC2351CUH-14#TRPBF datasheet, LTC2351CUH-14#TRPBF pinout, LTC2351CUH-14#TRPBF application, or LTC2351CUH-14#TRPBF equivalent, key selection criteria include simultaneous sampling capability, rail-to-rail analog input swing compliance, 32-pin QFN thermal performance, and SPI-compatible serial interface timing at up to 25MHz SCK.

Technical Context

The LTC2351CUH-14#TRPBF integrates six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous capture across all channels. Conversion proceeds at 250ksps per channel using a 14-bit successive-approximation architecture with internal 2.5V bandgap reference.

Its analog front-end supports configurable input range via the BIP pin and channel selection via SEL2/SEL1/SEL0, allowing dynamic reduction of converted channels (1–6) without reconfiguration delay. The device implements three power states: active (16.5mW), NAP (4.5mW), and sleep (12μW), with wake-up initiated by SCK or CONV pulses.

Key Specifications

Pinout & Package

Package: 32-pin (5mm × 5mm) plastic QFN with exposed pad (Pin 33 = GND). Thermal resistance θ_JA = 34°C/W; 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 simultaneous-sampling ADC applications.

Compared with ADS8686SIRTVT and AD7606C-16BSTZ, the LTC2351CUH-14#TRPBF delivers the highest aggregate sampling rate (1.5Msps) in the smallest 5mm × 5mm QFN package with the lowest sleep power (12μW), making it optimal for portable, phase-critical, and power-constrained applications.

Availability

LTC2351CUH-14#TRPBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control systems, and portable data acquisition requiring stable component supply, guaranteed lead-free compliance, and full production traceability.

Supply support for LTC2351CUH-14#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 LTC2351CUH-14#TRPBF belongs to ADI's precision simultaneous-sampling ADC product line, designed specifically for applications demanding phase-coherent multi-channel acquisition-such as energy metering, servo drives, and power quality analyzers-where timing integrity and low power are critical.

FAQ

What is the operating temperature range for the LTC2351CUH-14#TRPBF?

The LTC2351CUH-14#TRPBF is rated for 0°C to 70°C ambient operation, as indicated by the "UH" grade suffix. This commercial-grade temperature range is validated across all electrical specifications including 75dB SINAD, 83dB CMRR, and 250ksps per-channel throughput-making it suitable for indoor industrial and test equipment environments where thermal management is controlled.

Does the LTC2351CUH-14#TRPBF require an external reference, or can it operate with its internal reference?

The LTC2351CUH-14#TRPBF can operate fully with its internal 2.5V bandgap reference, which features 15ppm/°C tempco and settles in 2ms after wake-up. An external reference (2.55V to VDD) may be applied to VREF (Pin 23) for improved system-level accuracy or calibration traceability-but is not required for baseline functionality of the LTC2351CUH-14#TRPBF.

How does the SEL2/SEL1/SEL0 pin configuration affect conversion throughput in the LTC2351CUH-14#TRPBF?

The SEL2/SEL1/SEL0 pins on the LTC2351CUH-14#TRPBF determine how many of the six channels are converted per cycle: 000 enables CH0 only (1.5Msps effective rate), while 101 enables all six (250ksps per channel). Each enabled channel consumes 16 SCK cycles, so reducing active channels proportionally increases per-channel throughput-e.g., three channels yield 500ksps each-without changing the LTC2351CUH-14#TRPBF's core timing architecture.

Can the LTC2351CUH-14#TRPBF interface directly with a 1.8V microcontroller SPI port?

Yes-the LTC2351CUH-14#TRPBF supports level-shifting via OVDD (Pin 3), which powers the SDO output driver. By tying OVDD to 1.8V (within 300mV of VDD), the SDO output swings between 0V and 1.8V, ensuring compatible logic levels with 1.8V microcontrollers-while VDD/VCC remain at 3V for analog performance. This eliminates external level shifters in the LTC2351CUH-14#TRPBF design.

What is the significance of the 200ps channel-to-channel aperture skew specification for the LTC2351CUH-14#TRPBF?

The 200ps maximum aperture skew across all six channels of the LTC2351CUH-14#TRPBF ensures phase alignment better than 0.01° at 100kHz-critical for vector-based calculations like active/reactive power or rotor position estimation. This tight skew is achieved through matched internal S&H circuitry and eliminates need for post-acquisition software skew correction in the LTC2351CUH-14#TRPBF signal chain.