Analog Devices Inc. LTC1744CFW#PBF

Overview

LTC1744CFW#PBF from Analog Devices (formerly Linear Technology) is a 14-bit, 50Msps pipelined analog-to-digital converter optimized for high-frequency signal digitization in communications infrastructure. It delivers 77dB SNR and 87dB SFDR at ±1.6V input range, operates from a single 5V supply, dissipates 1.2W, and features ±1V/±1.6V selectable differential input ranges - enabling precision IF sampling in base station receivers.

For engineers reviewing the LTC1744CFW#PBF datasheet, LTC1744CFW#PBF pinout, LTC1744CFW#PBF application, or LTC1744CFW#PBF equivalent, key selection criteria include its 150MHz full-power bandwidth, 0.3psRMS aperture jitter, ±4LSB INL, no missing codes guarantee, and compatibility with PECL/TTL/CMOS encode interfaces across 0.5V–5V output voltage range.

Technical Context

The LTC1744CFW#PBF implements a 4-stage CMOS pipelined architecture with digital correction logic, achieving 5-cycle data latency and supporting differential ENC/ENC encode timing with 9.5ns minimum pulse width. Its sample-and-hold circuit uses direct capacitor sampling (7pF) with 7.5–9.5ns acquisition time and 150MHz full-power bandwidth.

It integrates a 2.5V VCM bias output (±30ppm/°C tempco), resistor-programmable input range selection via SENSE pin, and separate OVDD supply (0.5V–5V) for direct interfacing to low-voltage DSPs or FIFOs - all within a flow-through 48-pin TSSOP layout that minimizes trace skew and layout complexity.

Key Specifications

Pinout & Package

48-pin plastic TSSOP (FW package) with flow-through pinout optimized for differential signal routing and minimal crosstalk. Pin 1 = SENSE (range select), Pin 2 = VCM (2.5V common-mode bias), Pins 4–5 = AIN+/AIN– (differential analog inputs), Pins 23–24 = ENC/ENC (differential encode), Pins 28–46 = D0–D13 (14-bit parallel CMOS outputs), Pin 48 = OF (over/underflow flag).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9246BCPZ-50 and LTC2246HCUH#PBF, the LTC1744CFW#PBF uniquely combines ±1V/±1.6V range select, 2.5V VCM output, and 0.5V–5V OVDD flexibility - making it optimal for legacy 5V systems and mixed-voltage FPGA interfaces where level-shifting is undesirable.

Availability

LTC1744CFW#PBF is available at Aetrix Electronics and suitable for telecommunications receivers, wireless base stations, and spectrum analysis equipment requiring stable component supply and long-term industrial availability.

Supply support for LTC1744CFW#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 industrial, automotive, communications, and healthcare markets.

The LTC1744CFW#PBF belongs to ADI's legacy Linear Technology high-speed ADC product line, engineered specifically for demanding communications infrastructure applications requiring ultra-low jitter, wide input bandwidth, and flexible interface voltage operation.

FAQ

What is the operating temperature range for the LTC1744CFW#PBF?

The LTC1744CFW#PBF is specified for commercial temperature operation from 0°C to 70°C. This variant carries the "C" grade suffix, distinguishing it from the industrial-grade LTC1744IFW#PBF (–40°C to 85°C). Thermal derating applies above 70°C ambient, and junction temperature must remain below 150°C with θJA = 35°C/W.

Does the LTC1744CFW#PBF require an external reference voltage?

No, the LTC1744CFW#PBF uses an internal 2.5V reference buffered to the VCM pin and does not require an external reference. The REFHA/REFHB/REFLA/REFLB pins are internally connected to form a stable reference ladder; external bypassing with 4.7µF and 0.1µF capacitors is mandatory for noise suppression, but no external reference source is needed.

How is input range selected on the LTC1744CFW#PBF?

Input range on the LTC1744CFW#PBF is selected via the SENSE pin (Pin 1): grounding selects ±1V differential range; connecting to VDD selects ±1.6V; applying a voltage between 1V and 1.6V sets a proportional ±V_SENSE range. This resistor-programmable feature allows dynamic adaptation to varying signal amplitudes without hardware changes.

What is the data latency of the LTC1744CFW#PBF and how is it managed?

The LTC1744CFW#PBF has a fixed 5-cycle data latency from ENC edge to valid D0–D13 output. This deterministic delay is implemented via internal shift registers and correction logic, enabling precise timing alignment in synchronous FPGA-based capture systems. CLKOUT provides a rising-edge strobe synchronized to data validity, eliminating external delay matching requirements.

Can the LTC1744CFW#PBF interface directly with a 1.8V FPGA I/O bank?

Yes, the LTC1744CFW#PBF supports direct interface with 1.8V FPGA I/O banks using its OVDD supply pins (Pins 32, 43). Setting OVDD = 1.8V configures the D0–D13 outputs and CLKOUT/OF signals to operate at 1.8V logic levels, with VOL ≤ 0.4V and VOH ≥ 1.62V under load - eliminating level translators while maintaining timing integrity.