Analog Devices Inc. LTC2351IUH-12#TRPBF

Overview

LTC2351IUH-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, 83 dB common-mode rejection, and operation from a single 3 V supply. It delivers 250 ksps per channel throughput in a 32-pin 5 mm × 5 mm QFN package, targeting high-precision multiphase power and motor control systems.

For engineers reviewing the LTC2351IUH-12#TRPBF datasheet, LTC2351IUH-12#TRPBF pinout, LTC2351IUH-12#TRPBF application, or LTC2351IUH-12#TRPBF equivalent, key selection criteria include simultaneous sampling integrity, bipolar/unipolar mode flexibility via BIP pin, low-power Nap (4.5 mW) and Sleep (12 μW) modes, SPI-compatible serial interface timing, and ±1.25 V / 0–2.5 V differential input range compatibility.

Technical Context

The LTC2351IUH-12#TRPBF integrates six independent sample-and-hold circuits triggered synchronously on the rising edge of CONV, enabling true simultaneous acquisition across all channels. Its internal 2.5 V bandgap reference supports external overdrive (2.55 V to VDD), and conversion results are output MSB-first via a 3-wire SPI-compatible interface requiring up to 96 SCK cycles for full 6-channel readout.

Channel selection is controlled by SEL2/SEL1/SEL0, allowing programmable conversion of 1–6 channels per cycle - e.g., SELx = 001 enables CH0 and CH1 at 500 ksps each. The BIP pin configures data format (2's complement for ±1.25 V bipolar, straight binary for 0–2.5 V unipolar) and input range, with mandatory fixed-state maintenance during conversion and readout.

Key Specifications

Pinout & Package

Package: 32-pin plastic QFN (5 mm × 5 mm), exposed pad (Pin 33) soldered to PCB ground 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 LTC2351IUH-12#TRPBF offers optimal balance of 12-bit precision, simultaneous sampling integrity, 5 mm × 5 mm QFN size, and industry-leading 12 μW Sleep mode - making it uniquely suitable for space- and power-constrained industrial control nodes.

Availability

LTC2351IUH-12#TRPBF is available at Aetrix Electronics and suitable for multiphase power measurement, motor control, and uninterruptible power supply designs requiring stable component supply, guaranteed temperature range (–40°C to +85°C), and long-term production continuity.

Supply support for LTC2351IUH-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 LTC2351IUH-12#TRPBF belongs to ADI's precision data acquisition portfolio, designed specifically for real-time, multi-channel synchronized sampling in harsh electromagnetic environments such as factory automation and energy infrastructure.

FAQ

What is the operating temperature range of the LTC2351IUH-12#TRPBF?

The LTC2351IUH-12#TRPBF is rated for –40°C to +85°C operation, matching the "I" grade specification defined in the official datasheet. This extended industrial temperature range ensures reliable performance in motor drives, power converters, and outdoor industrial controllers where ambient temperatures fluctuate widely. The device maintains full parametric compliance-including 72 dB SINAD and 83 dB CMRR-across this entire range when powered from a 3 V supply.

How does the BIP pin affect output data format and input range in the LTC2351IUH-12#TRPBF?

When BIP is logic-low, the LTC2351IUH-12#TRPBF operates in unipolar mode: differential input range is 0 V to 2.5 V, and output data is in straight binary format. When BIP is logic-high, it switches to bipolar mode: input range becomes ±1.25 V, and output data uses 2's complement format. The BIP state must remain fixed during conversion and readout; changing it mid-sequence invalidates prior data and requires full acquisition time before next valid conversion.

Can the LTC2351IUH-12#TRPBF convert fewer than six channels, and how does that affect throughput?

Yes - the LTC2351IUH-12#TRPBF supports 1–6 channel conversion via SEL2/SEL1/SEL0 pins. For example, setting SELx = 001 converts only CH0 and CH1, requiring 32 SCK cycles instead of 96, resulting in 500 ksps per enabled channel. This increases per-channel throughput linearly with reduced channel count, enabling prioritized sampling of critical signals without sacrificing synchronization or resolution.

What is the minimum acquisition time required for full-speed operation of the LTC2351IUH-12#TRPBF?

The LTC2351IUH-12#TRPBF specifies a minimum sample-and-hold acquisition time (tACQ) of 39 ns at TA = 25°C and VDD = 3 V. This value applies when driving from low-impedance sources (<100 Ω). With higher source impedance, acquisition time increases; a buffer amplifier is recommended to maintain full 1.5 Msps aggregate sampling rate. The timing window begins after the 96th SCK rising edge and ends at the next CONV rising edge.

Does the LTC2351IUH-12#TRPBF include an internal voltage reference, and can it be overdriven?

Yes, the LTC2351IUH-12#TRPBF integrates a 2.5 V internal bandgap reference accessible at Pin 23 (VREF), with 15 ppm/°C tempco and 600 μV/V line regulation. It can be overdriven by an external reference voltage between 2.55 V and VDD, enabling improved accuracy or system-level reference sharing. When overdriven, the internal reference is disabled, and external reference settling time (2 ms with 10 μF load) must be accounted for after Sleep mode wake-up.