Analog Devices Inc. LTC1741CFW#PBF

Overview

LTC1741CFW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 65Msps pipelined analog-to-digital converter optimized for high-frequency, wide-dynamic-range signal digitization in communications infrastructure. It delivers 72dB SNR and 85dB SFDR at 3.2V input range, features ±1V/±1.6V pin-selectable differential input, and operates from a single 5V supply with 1.275W power dissipation. It is deployed in cellular base station receivers and spectrum analyzers requiring undersampling of IF signals up to 70MHz.

For engineers reviewing the LTC1741CFW#PBF datasheet, LTC1741CFW#PBF pinout, LTC1741CFW#PBF application, or LTC1741CFW#PBF equivalent, key selection criteria include aperture jitter (0.15psRMS), ±1 LSB INL over temperature, flow-through TSSOP-48 layout compatibility, and dual-voltage digital output support (0.5V–5V OVDD) for direct interfacing with low-voltage DSPs and FIFOs.

Technical Context

The LTC1741CFW#PBF implements a 4-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle data latency and enabling stable conversion at 65Msps. Its differential S/H front-end provides 240MHz full-power bandwidth and 80dB common-mode rejection, while ultralow aperture jitter ensures clean undersampling of 70MHz IF signals without significant SNR degradation.

Dual reference configuration supports both internal 2.35V bandgap bias (VCM pin) and external resistor-programmable input ranges. The ENC/ENC differential encode interface accepts PECL, GTL, TTL, CMOS, or sinusoidal drive, and the MSBINV pin selects between offset binary and 2's complement output formats - critical for baseband processing alignment in multi-ADC systems.

Key Specifications

Pinout & Package

Package: 48-lead plastic TSSOP (FW), 7.6mm × 12.5mm body, 0.5mm pitch, flow-through pinout optimized for high-speed analog/digital partitioning and controlled-impedance routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226BCPZ-65 and LTC2261IUP-14, the LTC1741CFW#PBF uniquely balances 65Msps throughput, 85dB SFDR, and flexible 0.5V–5V digital I/O - making it optimal for cost-sensitive, high-density RF receiver designs where board space and analog simplicity are constrained.

Availability

LTC1741CFW#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, spectrum analysis equipment, and high-speed data acquisition systems requiring stable component supply, long-term obsolescence management, and consistent parametric performance across production lots.

Supply support for LTC1741CFW#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 communications, industrial, automotive, and healthcare markets.

The LTC1741CFW#PBF belongs to ADI's legacy Linear Technology high-speed ADC product line, engineered specifically for demanding wireless infrastructure applications requiring exceptional dynamic range, low jitter, and robust operation in thermally variable environments.

FAQ

What is the operating temperature range for the LTC1741CFW#PBF?

The LTC1741CFW#PBF is specified for commercial operation from 0°C to 70°C (C-grade). This range is validated per the Absolute Maximum Ratings table and applies to all AC and DC specifications unless otherwise noted. For extended temperature operation, the LTC1741IFW variant supports –40°C to +85°C and shares identical pinout and functionality with the LTC1741CFW#PBF.

Does the LTC1741CFW#PBF require an external clock source, or can it generate its own sampling clock?

The LTC1741CFW#PBF does not include an internal oscillator and requires an external differential encode signal applied to ENC and ENC pins. It accepts sinusoidal, PECL, GTL, TTL, or CMOS clock sources - no internal clock generation capability exists. The CLKOUT pin provides a synchronized data-valid strobe but is not a clock output for sampling control.

How is the input range configured on the LTC1741CFW#PBF, and what are the implications for dynamic performance?

The LTC1741CFW#PBF input range is set via the SENSE pin: grounded for ±1V (2V range), tied to VDD for ±1.6V (3.2V range). At 3.2V range, SNR reaches 72dB and SFDR 85dB for 5MHz inputs; at 2V range, SFDR improves to 87dB but SNR drops to 70.5dB. Selection directly impacts trade-offs between noise floor and harmonic suppression in RF receiver design.

Can the LTC1741CFW#PBF interface directly with a 1.8V FPGA I/O bank without level shifters?

Yes - the LTC1741CFW#PBF supports OVDD from 0.5V to 5V. Setting OVDD = 1.8V configures D11–D0, CLKOUT, OE, and OF outputs to 1.8V logic levels with guaranteed VOH ≥ 1.71V and VOL ≤ 0.1V under load, enabling direct connection to 1.8V FPGA I/O banks without external level translation circuitry.

What is the purpose of the VCM pin on the LTC1741CFW#PBF, and how must it be decoupled?

The VCM pin on the LTC1741CFW#PBF outputs a precision 2.35V common-mode bias used to center the differential analog input signal. It must be bypassed to AGND with a minimum 4.7µF ceramic capacitor placed within 2mm of the pin - this capacitor serves as both high-frequency noise shunt and stability compensation for the internal bandgap reference amplifier.