Analog Devices Inc. LTC2281IUP#TRPBF

Overview

LTC2281IUP#TRPBF from Analog Devices (acquired Linear Technology) is a dual 10-bit, 125 Msps low-power 3V analog-to-digital converter optimized for high-frequency signal digitization in communications and imaging systems. It delivers 61.6 dB SNR and 82 dB SFDR at Nyquist, ±0.1 LSB INL/DNL, and 110 dB channel isolation at 100 MHz - enabling precise wide-dynamic-range acquisition in wireless base stations and spectral analyzers.

For engineers reviewing the LTC2281IUP#TRPBF datasheet, LTC2281IUP#TRPBF pinout, LTC2281IUP#TRPBF application, or LTC2281IUP#TRPBF equivalent, key selection criteria include dual-channel timing alignment, 640 MHz full-power bandwidth, flexible 1–2 V_P-P input range, and independent shutdown control per channel - all within a thermally enhanced 64-pin QFN package.

Technical Context

The LTC2281IUP#TRPBF implements a six-stage CMOS pipelined ADC architecture with integrated sample-and-hold, clock duty cycle stabilizer, and dual independent analog front-ends. Each channel features differential input S/H with 0.2 ps RMS aperture jitter, programmable reference via SENSEA/SENSEB pins, and separate OVDD output supply (0.5–3.6 V) supporting LVCMOS/LVTTL logic interfacing.

It operates from a single 2.85–3.4 V analog supply (790 mW typical power), supports offset binary or 2's complement output format via MODE pin, and provides CLKOUT for synchronous data capture. Pipeline latency is fixed at 5 cycles, and crosstalk remains ≤ –110 dB at 100 MHz - critical for time-interleaved or I/Q sampling systems.

Key Specifications

Pinout & Package

64-lead (9 mm × 9 mm) plastic QFN package with exposed thermal pad (Pin 65 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity. Pin pitch: 0.5 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-channel, 10-bit, high-speed ADC applications.

Compared with AD9236BCPZ-125 and LTC2280IUP#TRPBF, the LTC2281IUP#TRPBF uniquely combines dual 10-bit channels, 125 Msps throughput, on-chip clock stabilization, and programmable input range - making it optimal for space-constrained, high-fidelity I/Q sampling systems where channel matching and timing integrity are critical.

Availability

LTC2281IUP#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, medical ultrasound, and portable test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for LTC2281IUP#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 aerospace, industrial, automotive, and communications markets.

The LTC2281IUP#TRPBF belongs to ADI's high-speed data converter product line, designed specifically for demanding communications and instrumentation applications requiring dual-channel synchronization, low power, and wide input bandwidth.

FAQ

What is the operating temperature range for the LTC2281IUP#TRPBF?

The LTC2281IUP#TRPBF is specified for industrial operation from –40°C to +85°C. This rating is confirmed by the "I" grade in the part number and matches the Absolute Maximum Ratings table in the official datasheet. The device maintains full performance specifications across this range, including SNR, SFDR, and INL/DNL, when operated within recommended supply and input conditions.

Does the LTC2281IUP#TRPBF support single-ended analog input?

Yes, the LTC2281IUP#TRPBF supports single-ended analog input per channel. As documented in the Applications Information section, AIN+ can be driven with the signal while AIN– is tied to 1.5 V (VCMA/VCMB). However, this degrades harmonic distortion and INL - though SNR and DNL remain unchanged - so differential drive is recommended for optimal AC performance.

How does the MODE pin configure output format and clock stabilization on the LTC2281IUP#TRPBF?

The MODE pin on the LTC2281IUP#TRPBF selects both output coding and clock duty cycle stabilizer state: GND = offset binary + stabilizer off; 1/3 VDD = offset binary + stabilizer on; 2/3 VDD = 2's complement + stabilizer on; VDD = 2's complement + stabilizer off. This dual-function control is explicitly defined in the Pin Functions section of the datasheet and applies identically to both channels.

What is the purpose of the OF (overflow/underflow) pin on the LTC2281IUP#TRPBF?

The OF pin on the LTC2281IUP#TRPBF is an active-high open-drain output that asserts when either Channel A or Channel B experiences overflow or underflow - i.e., input exceeds the selected full-scale range. It shares logic between both channels and is intended for real-time signal integrity monitoring in closed-loop AGC or clipping-detection systems.

Can the LTC2281IUP#TRPBF operate with different supply voltages for analog and digital outputs?

Yes, the LTC2281IUP#TRPBF uses separate supplies: VDD (2.85–3.4 V) powers the analog core and clocks, while OVDD (0.5–3.6 V) independently powers the digital output drivers. This separation allows interfacing with diverse logic families (e.g., 1.8 V FPGA I/O or 3.3 V microcontroller buses) without level-shifting, and minimizes digital switching noise coupling into the analog section.