Analog Devices Inc. LTC2351HUH-12#TRPBF

Overview

LTC2351HUH-12#TRPBF from Analog Devices (formerly Linear Technology) is a 12-bit, 1.5 Msps simultaneous-sampling analog-to-digital converter with six 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 3 V single-supply operation and supports unipolar (0 V to 2.5 V) or bipolar (±1.25 V) differential input ranges-ideal for high-accuracy multiphase power monitoring in industrial motor drives.

For engineers reviewing the LTC2351HUH-12#TRPBF datasheet, LTC2351HUH-12#TRPBF pinout, LTC2351HUH-12#TRPBF application, or LTC2351HUH-12#TRPBF equivalent, key selection criteria include simultaneous sampling integrity, channel-to-channel aperture skew (200 ps), internal 2.5 V reference tempco (±15 ppm/°C), sleep mode power (12 μW), and SPI-compatible 3-wire serial interface timing compliance.

Technical Context

The LTC2351HUH-12#TRPBF implements six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous acquisition across all six differential pairs. Conversion proceeds at 250 ksps per channel using a successive-approximation architecture with internal 12-bit latches per channel and 96-clock serial output framing.

Its analog front-end supports rail-to-rail common-mode input (0 V to VDD) while maintaining strict differential range limits (±1.25 V or 0–2.5 V), and features 13 pF input capacitance with 39 ns acquisition time. The device integrates a 2.5 V bandgap reference with 2 ms settling after wake-up from Sleep mode and accepts external references between 2.55 V and VDD.

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#TRPBF uniquely balances 12-bit precision, six-channel simultaneity, ultra-low power, and compact 5 mm × 5 mm QFN packaging-making it optimal for thermally dense, multi-phase embedded control where per-channel latency and board area are critical.

Availability

LTC2351HUH-12#TRPBF 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#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 LTC2351HUH-12#TRPBF belongs to ADI's high-speed precision SAR ADC product line, engineered specifically for demanding industrial automation applications requiring simultaneous multi-channel sampling, wide temperature operation, and low power in compact form factors.

FAQ

What is the maximum operating temperature range for the LTC2351HUH-12#TRPBF?

The LTC2351HUH-12#TRPBF is rated for operation from –40°C to +125°C (H-grade), verified per manufacturer specifications in the Absolute Maximum Ratings table. This extended range supports deployment in engine compartments, industrial inverters, and sealed outdoor enclosures without derating. The LTC2351HUH-12#TRPBF maintains full parametric performance-including 72 dB SINAD and 200 ps aperture skew-across this entire range.

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

No, the LTC2351HUH-12#TRPBF includes a precision 2.5 V internal bandgap reference with ±15 ppm/°C tempco and 2 ms wake-up settling time. An external reference is optional and only needed if tighter initial accuracy (<±0.1%) or lower tempco (<±5 ppm/°C) is required. When used, the external reference must be between 2.55 V and VDD and applied to the VREF pin.

How does the SEL2–SEL0 pin configuration affect conversion throughput in the LTC2351HUH-12#TRPBF?

The SEL2–SEL0 pins configure the number of active channels (1–6), directly scaling per-channel throughput: 1 channel yields 1.5 Msps, 3 channels yield 500 ksps, and all 6 channels deliver 250 ksps each. This is achieved by reducing the total serial clock cycles from 16 (1 channel) to 96 (6 channels), preserving the 4 μs minimum sampling period. The LTC2351HUH-12#TRPBF maintains simultaneous sampling regardless of SELx setting.

Can the LTC2351HUH-12#TRPBF interface directly with 1.8 V logic systems?

Yes-the LTC2351HUH-12#TRPBF supports mixed-voltage I/O via the OVDD pin (Pin 3), which powers the SDO output driver. OVDD may be set as low as 1.7 V (≥300 mV below VDD) to drive 1.8 V logic families directly, while VDD/VCC remain at 3 V for analog performance. The SDO output high level tracks OVDD, and VIH/VIL thresholds scale accordingly per the Digital Inputs and Outputs table.

What is the purpose of the exposed thermal pad (Pin 33) on the LTC2351HUH-12#TRPBF QFN package?

The exposed pad (Pin 33) is electrically and thermally connected to GND and must be soldered to a solid PCB ground plane. It reduces thermal resistance (θJA = 34°C/W) and improves power dissipation reliability-critical for sustained operation at 125°C ambient. Leaving it unconnected degrades thermal performance by >40% and risks parametric shift or premature failure. The LTC2351HUH-12#TRPBF datasheet explicitly mandates soldering this pad.