Analog Devices Inc. LTC1406IGN#TRPBF

Overview

LTC1406IGN#TRPBF from Analog Devices (formerly Linear Technology) is an 8-bit, 20Msps sampling analog-to-digital converter with differential input architecture, ±1V full-scale range, ±1LSB INL/DNL, and 250MHz sample-and-hold bandwidth. It operates from a single 5V supply, dissipates 150mW, and supports undersampling in high-speed communications receivers and CCD imaging front-ends.

For engineers reviewing the LTC1406IGN#TRPBF datasheet, LTC1406IGN#TRPBF pinout, LTC1406IGN#TRPBF application, or LTC1406IGN#TRPBF equivalent, key selection criteria include its 20MHz sampling rate, 47.5dB S/(N+D) at 10MHz input, 60dB CMRR, 5-cycle pipeline latency, and 24-pin SSOP package compatibility with mixed-voltage digital interfacing (OVDD = 2.7–5.25V).

Technical Context

The LTC1406IGN#TRPBF employs a 5-stage pipelined ADC architecture with internal track-and-hold, where conversion is triggered on the falling edge of CLK and data appears after exactly five clock cycles. Its differential input stage accepts either true differential signals (±0.5V) or single-ended inputs referenced to VREF, with rail-to-rail common-mode range (0V to VDD) and 60dB CMRR up to 100MHz.

Dynamic performance is defined by measured AC specs: 47.5dB S/(N+D) and –59dB THD at 10MHz input (Nyquist), 60dB SFDR, and 60dB IMD for two-tone 3.5MHz inputs. Power-down mode reduces supply current to 1µA via SHDN pin, while OVDD/OGND isolation enables direct interface to 3V logic without level shifters.

Key Specifications

Pinout & Package

Package: 24-lead narrow-body SSOP (GN), 0.15mm pitch, JEDEC MO-179AA compliant, body size 7.5mm × 4.4mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit, 20Msps ADC applications.

Compared with AD9203ARUZ and MAX1186ETL+, the LTC1406IGN#TRPBF uniquely combines 5V operation, differential input with 60dB CMRR, separate OVDD/OGND for 3V logic interfacing, and 1µA shutdown-making it optimal for cost-sensitive, mixed-supply, noise-prone RF and imaging front-ends.

Availability

LTC1406IGN#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, industrial imaging, digital video capture, and high-speed data acquisition requiring stable component supply and long-term manufacturability.

Supply support for LTC1406IGN#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.

The LTC1406IGN#TRPBF belongs to Linear Technology's legacy high-speed ADC product line, designed specifically for low-power, wideband digitization in communications receivers, imaging systems, and test equipment where differential noise immunity and flexible voltage interfacing are critical.

FAQ

What is the maximum input frequency the LTC1406IGN#TRPBF can accurately sample?

The LTC1406IGN#TRPBF features a 250MHz analog input bandwidth and maintains usable dynamic performance (47.5dB S/(N+D)) up to its 10MHz Nyquist frequency. It supports undersampling of higher-frequency signals (e.g., 900MHz IF) due to its wideband sample-and-hold, though distortion increases beyond Nyquist. The device is not specified for RF direct sampling but excels in IF digitization applications.

Does the LTC1406IGN#TRPBF require an external reference voltage?

Yes, the LTC1406IGN#TRPBF requires an external reference voltage applied to the VREF pin, typically 2.5V (e.g., LT1460-2.5), to set its ±1V full-scale input range. VREF accepts 2V to 3V, enabling dynamic span adjustment. The internal 2.2V VBIAS is fixed and used for biasing the input stage, not as a reference.

Can the LTC1406IGN#TRPBF interface directly with 3V logic systems?

Yes, the LTC1406IGN#TRPBF supports direct 3V logic interfacing via its dedicated OVDD and OGND pins, which power the D7–D0 and OF/UF outputs. OVDD can be set from 2.7V to 5.25V, allowing seamless connection to 3V FPGAs or microcontrollers without level shifters-while AVDD/DVDD remain at 5V for analog/digital core operation.

What is the purpose of the OF/UF pin on the LTC1406IGN#TRPBF?

The OF/UF (Overflow/Underflow) pin on the LTC1406IGN#TRPBF is a status flag indicating out-of-range input conditions. It asserts high when the output code is all-ones (overrange) or all-zeros (underrange), enabling real-time clipping detection in signal processing pipelines. This eliminates the need for software-based range checking and improves system responsiveness in closed-loop applications.

How does the LTC1406IGN#TRPBF achieve low power consumption?

The LTC1406IGN#TRPBF achieves 150mW typical dissipation at 20Msps through optimized pipeline architecture and low-voltage internal circuitry. Further reduction is enabled by the SHDN pin, which lowers supply current to 1µA in shutdown mode. Its single 5V supply and absence of external support components (e.g., separate reference buffers) also minimize system-level power overhead.