Analog Devices Inc. LTC1741CFW

Overview

LTC1741CFW 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 receivers and spectrum analysis systems. It delivers 72 dB SNR and 85 dB SFDR at 3.2 V input range, operates on a single 5 V supply, and features ±1 V or ±1.6 V pin-selectable differential input ranges with 240 MHz full-power bandwidth.

For engineers reviewing the LTC1741CFW datasheet, LTC1741CFW pinout, LTC1741CFW application, or LTC1741CFW equivalent, this page provides verified technical context, real-world timing and noise performance data, package-validated pin functions, and two confirmed alternative ADCs for 65 Msps, 12-bit sampling applications requiring low jitter (0.15 psRMS) and no missing codes.

Technical Context

The LTC1741CFW implements a four-stage CMOS pipelined architecture with digital error correction logic, achieving 5-cycle latency and supporting undersampling of IF signals up to 70 MHz. Its differential ENC/ENC encode interface accepts PECL, GTL, TTL, CMOS, or sinusoidal drive, enabling flexible clocking in mixed-signal RF front ends.

It integrates a 2.35 V bandgap reference with programmable input range selection via SENSE pin, dual-reference buffering (REFHA/REFHB and REFLA/REFLB), and separate OVDD output supply (0.5–5 V) for direct interfacing with low-voltage DSPs or FIFOs without level shifters.

Key Specifications

Pinout & Package

Package: 48-lead plastic TSSOP (FW), flow-through pinout optimized for analog/digital signal separation and minimal trace coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit, 65 Msps ADC applications.

Compared with AD9226ASTZ and MAX1186ETM+, the LTC1741CFW offers superior SNR/SFDR, integrated reference and range selection, and flexible OVDD-making it optimal for RF receiver designs where dynamic range, layout simplicity, and power supply flexibility are critical.

Availability

LTC1741CFW is available at Aetrix Electronics and suitable for cellular base station receivers, spectrum analyzer front ends, and imaging system data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LTC1741CFW 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 precision instrumentation, communications, and industrial markets.

The LTC1741CFW belongs to ADI's high-speed precision ADC product line, designed specifically for demanding communications infrastructure applications requiring low jitter, high SFDR, and robust DC accuracy across temperature.

FAQ

What is the operating temperature range for the LTC1741CFW?

The LTC1741CFW is specified for commercial-grade operation from 0°C to 70°C. This is indicated by the "C" suffix in the part number. For extended temperature applications (–40°C to 85°C), the pin-compatible LTC1741IFW variant is available. The LTC1741CFW's DC specifications-including ±1 LSB INL and ±0.8 LSB DNL-are guaranteed across its full 0°C to 70°C range.

How does the SENSE pin configure the input range on the LTC1741CFW?

The SENSE pin on the LTC1741CFW selects the full-scale differential input range: grounding SENSE sets ±1 V (2 V range), connecting SENSE to VDD sets ±1.6 V (3.2 V range). Intermediate voltages enable resistor-programmed ranges between these extremes. This configuration directly scales the internal reference ladder and affects both SNR (higher with larger range) and SFDR (often better with smaller range at high frequencies).

Can the LTC1741CFW interface directly with a 1.8 V FPGA without level shifters?

Yes-the LTC1741CFW supports OVDD from 0.5 V to 5 V, allowing its D0–D11 and OF outputs to be powered directly from a 1.8 V rail. When OVDD = 1.8 V, output VOH is ≥1.7 V and VOL is ≤0.1 V under load, meeting standard 1.8 V LVCMOS input thresholds. No external level shifters are needed, simplifying interconnect and reducing signal integrity risk.

What is the significance of the 5-cycle latency in the LTC1741CFW pipeline?

The LTC1741CFW exhibits fixed 5-cycle latency from ENC edge to valid CLKOUT-strobed output. This deterministic delay enables precise timing alignment in closed-loop systems like digital predistortion, where feedback path delay must be known and stable. Unlike asynchronous converters, this latency remains constant across temperature, supply, and input conditions-critical for real-time control algorithms.

Does the LTC1741CFW require external decoupling capacitors, and if so, where?

Yes-the LTC1741CFW requires specific decoupling: 4.7 µF on VCM (Pin 2), 1 µF on each VDD pin (Pins 7, 8, 17, 18, 20), 0.1 µF between REFHA–REFLB (Pins 11–10) and REFLA–REFHB (Pins 14–15), and 0.1 µF on each OVDD pin (Pins 32, 43). These values are validated in the datasheet layout guidelines and essential to maintain 72 dB SNR and prevent reference noise coupling into the analog core.