Analog Devices Inc. LTC1742IFW#PBF

Overview

LTC1742IFW#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 65Msps pipelined analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications systems. It delivers 76.5dB SNR and 90dB SFDR at 3.2V input range, features ±1V/±1.6V pin-selectable differential input ranges, 240MHz full-power bandwidth sample-and-hold, and operates from a single 5V supply with 1.275W power dissipation.

For engineers reviewing the LTC1742IFW#PBF datasheet, LTC1742IFW#PBF pinout, LTC1742IFW#PBF application, or LTC1742IFW#PBF equivalent, key selection criteria include its 65Msps sampling rate, differential ENC/ENC clock interface, flow-through TSSOP-48 layout, 0.15psRMS aperture jitter, and support for 0.5V–5V OVDD output voltage compatibility with low-voltage DSPs and FIFOs.

Technical Context

The LTC1742IFW#PBF implements a four-stage CMOS pipelined ADC architecture with digital correction logic, delivering five-cycle data latency and no missing codes across temperature. Its differential analog input (AIN+/AIN–) and differential encode inputs (ENC/ENC) provide high common-mode noise immunity and enable ultralow-jitter sampling of IF signals up to 70MHz.

Internal reference configuration is controlled via the SENSE pin (ground = ±1V, VDD = ±1.6V), while VCM provides a stable 2.35V common-mode bias. The digital output drivers support 5V, 3V, 2V, and LVDS logic levels via programmable OVDD (0.5V–5V), and feature OE-controlled three-state outputs with CLKOUT-synchronized latching.

Key Specifications

Pinout & Package

Package: 48-lead plastic TSSOP (FW package) with flow-through pinout optimized for high-speed PCB layout and signal integrity.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9246BCPZ-65 and LTC2264IUP-14, the LTC1742IFW#PBF offers superior SFDR (90dB vs ≤87dB), wider OVDD flexibility (0.5V–5V), and pin-selectable input range - making it preferred for demanding IF sampling where spurious-free dynamic range and supply interoperability are critical.

Availability

LTC1742IFW#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum monitoring, medical imaging, and high-speed test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1742IFW#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 acquired Linear Technology in 2017 and continues to develop and support its high-performance signal chain portfolio.

The LTC1742IFW#PBF belongs to Linear's precision high-speed ADC family, designed specifically for communications infrastructure and instrumentation applications demanding high SFDR, low jitter, and flexible interfacing in harsh RF environments.

FAQ

What is the operating temperature range for the LTC1742IFW#PBF?

The LTC1742IFW#PBF is rated for industrial operation from –40°C to +85°C (I-grade). This extended range ensures reliable performance in base station outdoor units, spectrum analyzers deployed in variable environments, and industrial DAQ systems where ambient temperatures exceed commercial limits. The device's thermal resistance (θJA = 35°C/W) and 150°C junction limit support sustained operation under full load within this range.

Does the LTC1742IFW#PBF require an external reference, or does it have an internal one?

The LTC1742IFW#PBF includes a precision internal 2.35V bandgap reference used for both common-mode bias (VCM) and ADC core reference generation. No external reference is required - the SENSE pin selects between ±1V and ±1.6V input ranges using this internal reference. External references are not supported; all specifications assume use of the internal reference unless otherwise noted in the datasheet.

Can the LTC1742IFW#PBF interface directly with a 1.8V FPGA I/O bank?

Yes, the LTC1742IFW#PBF can interface directly with a 1.8V FPGA I/O bank by setting OVDD = 1.8V. Its digital outputs are fully specified from 0.5V to 5V, and output voltage levels (VOH/VOL) meet 1.8V logic thresholds across temperature and load. This eliminates level shifters and simplifies interconnect in mixed-voltage systems - a key advantage over many competing ADCs limited to 2.5V or 3.3V outputs.

What is the purpose of the MSBINV pin on the LTC1742IFW#PBF?

The MSBINV pin on the LTC1742IFW#PBF controls output data format: logic low selects 2's complement (for signed baseband processing), while logic high selects offset binary (for unsigned signal chain interfaces). This hardware-selectable format avoids software conversion overhead and ensures bit-aligned compatibility with downstream DSPs, FPGAs, or ASICs expecting either representation without firmware modification.

How does the LTC1742IFW#PBF achieve 0.15psRMS aperture jitter?

The LTC1742IFW#PBF achieves 0.15psRMS aperture jitter through a combination of proprietary low-noise sample-and-hold circuitry, differential ENC/ENC clock inputs with high-gain, low-threshold comparators, and on-chip clock distribution optimized for phase stability. This jitter specification is measured under standard conditions (65MHz sine-wave encode, ±1.6V input) and enables <76dB SNR when undersampling 70MHz IF signals - a critical capability for zero-IF and direct-conversion receiver architectures.