Analog Devices Inc. LTC2351HUH-12#PBF

Overview

LTC2351HUH-12#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.5 Msps simultaneous-sampling analog-to-digital converter with six fully differential input channels, 72 dB SINAD at 100 kHz, 83 dB common-mode rejection, and operation over –40°C to +125°C. It delivers 250 ksps per channel throughput with rail-to-rail analog input capability and supports unipolar (0 V to 2.5 V) or bipolar (±1.25 V) differential ranges via the BIP pin - ideal for high-accuracy multiphase power measurement in industrial motor drives.

For engineers reviewing the LTC2351HUH-12#PBF datasheet, LTC2351HUH-12#PBF pinout, LTC2351HUH-12#PBF application, or LTC2351HUH-12#PBF equivalent, this page provides verified technical context, package mapping, real-world timing behavior, validated alternative options, and supply-chain support details specific to the H-grade automotive/industrial variant.

Technical Context

The LTC2351HUH-12#PBF implements six independent sample-and-hold circuits synchronized to a single rising-edge CONV signal, enabling true simultaneous acquisition across all channels before sequential 12-bit conversion at 250 ksps per channel. Its internal 2.5 V bandgap reference (15 ppm/°C tempco) supports external overdrive between 2.55 V and VDD, and the 3-wire SPI-compatible serial interface outputs six 12-bit words in 96 SCK cycles.

Channel-to-channel aperture skew is specified at 200 ps, and full linear bandwidth is 5 MHz with 50 MHz full-power bandwidth. The device features three power modes: Active (6 mA typical), NAP (1.8 mA), and SLEEP (12 μA), with mode selection controlled by CONV pulse count while SCK is held static.

Key Specifications

Pinout & Package

Package: 32-pin (5 mm × 5 mm) QFN with exposed thermal pad (Pin 33 = GND). Requires soldering exposed pad to solid ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8686SIPWR and AD7606C-18BSTZ, the LTC2351HUH-12#PBF offers optimal balance of speed (250 ksps/ch), power efficiency (6 mA), and integration (on-chip reference, single 3 V supply, QFN footprint) for space-constrained industrial motor controllers requiring deterministic timing and robust noise immunity.

Availability

LTC2351HUH-12#PBF is available at Aetrix Electronics and suitable for multiphase motor control, uninterruptible power supplies, and industrial data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LTC2351HUH-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 LTC2351HUH-12#PBF belongs to ADI's high-speed precision ADC product line, designed specifically for demanding real-time control and measurement applications where simultaneous sampling, low power, and wide temperature operation are essential.

FAQ

What is the maximum sampling rate per channel for the LTC2351HUH-12#PBF?

The LTC2351HUH-12#PBF achieves 250 ksps per channel when all six differential inputs are enabled. This is derived from its 1.5 Msps aggregate sampling rate divided across six simultaneously acquired channels. The device maintains this rate across its full –40°C to +125°C operating range, with timing validated in the H-grade specification table.

Does the LTC2351HUH-12#PBF require an external reference voltage?

No, the LTC2351HUH-12#PBF includes an internal 2.5 V bandgap reference with 15 ppm/°C tempco, which is fully functional out-of-the-box. However, it supports external reference overdrive between 2.55 V and VDD, allowing users to improve accuracy or match system-level reference standards without redesigning the analog front-end.

How does the LTC2351HUH-12#PBF enter and exit Sleep mode?

The LTC2351HUH-12#PBF enters Sleep mode when four or more CONV pulses are issued while SCK is held static (high or low). It exits Sleep mode upon receiving any SCK pulse, after which the internal reference requires 2 ms to settle before valid conversions resume. This behavior is explicitly defined in the Timing Characteristics table and confirmed in the Nap/Sleep Mode Waveforms diagram.

Can the LTC2351HUH-12#PBF interface directly with a 1.8 V logic MCU?

Yes - the LTC2351HUH-12#PBF supports level-shifting via the OVDD pin (Pin 3), which powers the SDO output driver. By tying OVDD to 1.8 V (within 300 mV of VDD), the SDO output swings between 0 V and 1.8 V, enabling direct connection to 1.8 V I/O domains without external level translators.

What is the significance of the exposed thermal pad (Pin 33) on the LTC2351HUH-12#PBF?

The exposed pad (Pin 33) is electrically and thermally connected to GND. It must be soldered to a solid PCB ground plane to ensure proper thermal dissipation (θJA = 34°C/W) and low-impedance return path for analog and digital ground currents. Omitting this connection degrades both thermal performance and noise immunity, particularly in high-SINAD applications.