Analog Devices Inc. LTC1746IFW#TRPBF

Overview

LTC1746IFW#TRPBF from Analog Devices (formerly Linear Technology) is a 25 Msps, 14-bit pipelined analog-to-digital converter optimized for high-frequency, wide dynamic range signal digitization in communications and instrumentation systems. It delivers 77.5 dB SNR and 91 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.

For engineers reviewing the LTC1746IFW#TRPBF datasheet, LTC1746IFW#TRPBF pinout, LTC1746IFW#TRPBF application, or LTC1746IFW#TRPBF equivalent, this page provides verified technical context, validated package mapping, confirmed timing and AC/DC specifications, and real-world interface guidance for undersampling, transformer-coupled, and op-amp-driven front-ends.

Technical Context

The LTC1746IFW#TRPBF implements a 4-stage CMOS pipelined ADC architecture with 5-cycle data latency and integrated sample-and-hold amplifier featuring 240 MHz full-power bandwidth. Its differential ENC/ENC encode interface supports PECL, GTL, TTL, CMOS, or sinusoidal drive, with ultralow 0.3 ps_RMS aperture jitter enabling high-fidelity undersampling of RF signals up to 70 MHz.

It integrates a 2.35 V bandgap reference with programmable input range control, internal differential reference buffers (REFHA/REFHB/REFLA/REFLB), and a flow-through TSSOP-48 pinout that separates analog, digital, and ground domains to minimize coupling. The digital output drivers support independent OVDD from 0.5 V to 5 V, enabling direct interfacing with low-voltage DSPs and FIFOs without level-shifting.

Key Specifications

Pinout & Package

The LTC1746IFW#TRPBF is housed in a 48-lead plastic TSSOP (FW package) with flow-through pinout optimized for analog/digital isolation and minimal trace crosstalk. Thermal pad is not present; θ_JA = 35°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD9245BSTZ-25 and MAX1186ETM+, the LTC1746IFW#TRPBF offers superior SFDR for dense multi-carrier environments, wider input range configurability without reconfiguration overhead, and native 5 V compatibility - making it optimal for legacy 5 V infrastructure and demanding spectral purity requirements.

Availability

LTC1746IFW#TRPBF is available at Aetrix Electronics and suitable for telecommunications base stations, medical ultrasound systems, spectrum analyzers, and test equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for LTC1746IFW#TRPBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and industrial markets.

The LTC1746IFW#TRPBF belongs to Linear's high-speed precision ADC family designed specifically for wideband digitization in RF, medical, and test equipment - emphasizing low jitter, flexible input scaling, and robust layout-friendly packaging.

FAQ

What is the operating temperature range for the LTC1746IFW#TRPBF?

The LTC1746IFW#TRPBF is specified for operation from –40°C to +85°C (Industrial grade). This is confirmed by the "I" suffix in the part number and Absolute Maximum Ratings table, which lists LTC1746I operating temperature range as –40°C to 85°C. The device is qualified per JEDEC standards for industrial applications requiring extended thermal reliability.

Does the LTC1746IFW#TRPBF require an external reference?

No, the LTC1746IFW#TRPBF includes an internal 2.35 V bandgap reference and fully integrated differential reference buffers (REFHA/REFHB/REFLA/REFLB). External reference usage is optional and only required when custom voltage ranges beyond ±1 V or ±1.6 V are needed - for standard operation, no external reference is necessary.

How is the input range selected on the LTC1746IFW#TRPBF?

The input range of the LTC1746IFW#TRPBF is selected via the SENSE pin (Pin 1): tying SENSE to GND configures ±1 V differential input range; tying SENSE to VDD configures ±1.6 V differential input range. Intermediate voltages between 1 V and 1.6 V set proportional ranges (e.g., 2 × V_{SENSE), enabling fine-grained dynamic range tuning without hardware changes.}

What is the data latency of the LTC1746IFW#TRPBF?

The LTC1746IFW#TRPBF has a fixed data latency of 5 conversion cycles, as stated in the Timing Characteristics table. This means that a sample acquired on cycle N appears at the D0–D13 outputs on cycle N+5. This deterministic latency is critical for time-aligned multi-channel systems and real-time control loops requiring predictable pipeline delay.

Can the LTC1746IFW#TRPBF interface directly with a 1.8 V FPGA?

Yes, the LTC1746IFW#TRPBF supports direct interfacing with 1.8 V FPGAs via its independent OVDD supply (Pins 32, 43), which can be set from 0.5 V to 5 V. When OVDD = 1.8 V, the D0–D13 outputs, CLKOUT, and OF signals meet 1.8 V logic thresholds - eliminating level shifters and reducing signal integrity risk in high-speed digital paths.