Analog Devices Inc. LTC1741IFW#PBF

Overview

LTC1741IFW#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 65 Msps pipelined analog-to-digital converter optimized for high-frequency, wide dynamic range signal digitization in communications infrastructure. It delivers 72 dB SNR and 85 dB SFDR at 3.2 V input range, operates from a single 5 V supply, and features ±1 V or ±1.6 V differential input range selection via the SENSE pin. It is deployed in cellular base station receivers and spectrum analysis equipment where undersampling of IF signals up to 70 MHz is required.

For engineers reviewing the LTC1741IFW#PBF datasheet, LTC1741IFW#PBF pinout, LTC1741IFW#PBF application, or LTC1741IFW#PBF equivalent, key selection considerations include its 0.15 psRMS aperture jitter, flow-through TSSOP-48 pinout, resistor-programmable input range, LVDS/CMOS/TTL-compatible digital interface, and separate OVDD output supply (0.5 V to 5 V) for direct interfacing with low-voltage DSPs or FIFOs.

Technical Context

The LTC1741IFW#PBF implements a four-stage CMOS pipelined ADC architecture with digital correction logic, achieving 5-cycle data latency. Its differential sample-and-hold amplifier provides 240 MHz full-power bandwidth and supports undersampling via ultralow jitter (0.15 psRMS), enabling clean digitization of IF signals up to 70 MHz without external clock cleanup.

It uses a 2.35 V internal bandgap reference to generate differential reference levels (REFHA/REFHB, REFLA/REFLB) and provides a buffered VCM output for common-mode biasing of external drivers. Input range is selected by SENSE pin voltage (GND = ±1 V, VDD = ±1.6 V), and output format (offset binary or 2's complement) is controlled by MSBINV.

Key Specifications

Pinout & Package

Package: 48-lead plastic TSSOP (FW), 7.0 mm × 12.0 mm, exposed pad (GND-connected), moisture sensitivity level 3. Flow-through pinout simplifies high-speed analog/digital partitioning and reduces crosstalk.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9226ASTZ-65 and LTC2245IUP#PBF, the LTC1741IFW#PBF uniquely integrates input range selection, VCM bias, and dual-supply digital outputs in a single TSSOP package - reducing BOM count and layout complexity for IF-sampling receivers where 12-bit fidelity suffices.

Availability

LTC1741IFW#PBF is available at Aetrix Electronics and suitable for cellular infrastructure, test instrumentation, and medical imaging systems requiring stable component supply, long-term manufacturability, and guaranteed lot traceability.

Supply support for LTC1741IFW#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 semiconductors, serving communications, industrial, automotive, and healthcare markets.

The LTC1741IFW#PBF belongs to ADI's legacy Linear Technology high-speed ADC product line, designed specifically for demanding wireless infrastructure and instrumentation applications requiring excellent AC performance, flexible interfacing, and robust operation across industrial temperature ranges (–40°C to +85°C).

FAQ

What is the operating temperature range for the LTC1741IFW#PBF?

The LTC1741IFW#PBF is rated for industrial operation from –40°C to +85°C (I-grade). This is confirmed in the Absolute Maximum Ratings table and applies to all DC and AC specifications unless otherwise noted. The "I" suffix in the part number explicitly denotes this extended temperature range, distinguishing it from the commercial-grade C-version (0°C to 70°C).

Does the LTC1741IFW#PBF require an external reference, or does it have an internal one?

The LTC1741IFW#PBF includes an internal 2.35 V bandgap reference used to generate both the VCM bias and internal differential reference levels (REFHA/REFHB, REFLA/REFLB). No external reference is required for basic operation. However, the SENSE pin allows selection between ±1 V and ±1.6 V input ranges using only internal circuitry - eliminating need for external reference ICs in most implementations.

Can the LTC1741IFW#PBF interface directly with a 1.8 V FPGA?

Yes. The LTC1741IFW#PBF supports independent OVDD supply from 0.5 V to 5 V. Setting OVDD to 1.8 V configures the D[11:0], CLKOUT, OE, and OF outputs to be fully compatible with 1.8 V FPGA I/O standards - no level-shifting circuitry is needed, simplifying interconnect and reducing signal integrity risk.

What is the purpose of the SENSE pin on the LTC1741IFW#PBF?

The SENSE pin on the LTC1741IFW#PBF selects the full-scale differential input range: tying SENSE to GND configures ±1 V range; tying it to VDD configures ±1.6 V range. Intermediate voltages enable custom ranges (e.g., ±1.2 V) using external resistors. This eliminates external gain-setting components and allows dynamic range optimization per signal chain stage.

How does the flow-through pinout of the LTC1741IFW#PBF benefit PCB layout?

The flow-through pinout of the LTC1741IFW#PBF physically separates analog inputs (Pins 4–5), reference pins (Pins 10–11, 14–15), power/ground (Pins 3, 6, 7, 8, etc.), and digital outputs (Pins 30–46) along opposite edges. This enables straightforward partitioning of analog and digital ground planes, minimizes trace crosstalk, and simplifies routing of high-speed differential signals like ENC/ENC and AIN+/AIN– without layer swaps.