Texas Instruments ADS801U

Overview

ADS801U from Texas Instruments is a monolithic 12-bit, 25MHz pipeline analog-to-digital converter with internal reference, wideband track-and-hold (65MHz full-power bandwidth), single +5V supply operation, and guaranteed no missing codes - deployed in high-speed imaging, video digitizing, and IF/baseband telecommunications systems.

For engineers reviewing the ADS801U datasheet, ADS801U pinout, ADS801U application, or ADS801U equivalent, this page delivers verified technical context, real-world design meaning of key specs, SO-28 package layout, functional alternatives for sampling rate and resolution trade-offs, and supply-chain support for industrial and instrumentation BOMs.

Technical Context

The ADS801U implements an 11-stage pipelined architecture with 2-bit quantizers per stage and digital error correction to ensure 12-bit differential linearity and eliminate missing codes across –40°C to +85°C. Its fully differential track-and-hold accepts either single-ended or differential inputs referenced to +2.25V common-mode voltage.

Conversion is clocked by a 50% duty-cycle CMOS signal; data latency is fixed at 6.5 clock cycles. Output coding is selectable between Straight Offset Binary (SOB) and Binary Two's Complement (BTC) via MSBI pin, with three-state CMOS outputs enabled/disabled by OE pin.

Key Specifications

Pinout & Package

ADS801U is housed in a 28-pin SOIC (SO-28) package with exposed pad not present; thermal resistance θ_JA = 75°C/W. Pin assignments are validated per TI SBAS036B datasheet Rev FEBRUARY 2005.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS801U, ADS802U offers higher sampling rate and dynamic performance at increased power, while AD9220AR trades speed and integration for lower cost and external reference configurability - making ADS801U the optimal balance of speed, integration, and power for 25 MSPS imaging and video systems.

Availability

ADS801U is available at Aetrix Electronics and suitable for CCD imaging systems, video digitizing equipment, telecom IF digitization, and test & measurement instrumentation requiring stable component supply and long-term BOM continuity.

Supply support for ADS801U 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-performance data converters for industrial, automotive, and communications markets.

The ADS801U belongs to TI's high-speed pipeline ADC product line, engineered for demanding digitization tasks in imaging, video, and communications where speed, linearity, and low power must coexist.

FAQ

What is the maximum sampling rate supported by the ADS801U?

The ADS801U is specified for continuous operation at 25 million samples per second (25 MSPS). This maximum rate is validated across the full industrial temperature range (–40°C to +85°C) with proper clock timing (50% duty cycle, ≤2 ns edge rates) and adequate power supply decoupling. Exceeding 25 MSPS may degrade SNR, SFDR, and DNL performance per TI SBAS036B datasheet specifications. The ADS801U achieves this rate using a pipelined architecture with 6.5-cycle latency.

Does the ADS801U require external reference components?

No - the ADS801U integrates an internal reference generating +1.25V (REFB) and +3.25V (REFT) with a common-mode voltage of +2.25V. External 0.1 µF bypass capacitors on REFB and REFT pins are required for stability, but no external reference ICs or resistors are needed for basic operation. The device supports optional external references (≥18 mA drive) to adjust full-scale range or improve gain drift, but this is not mandatory.

How is differential input configured on the ADS801U?

Differential input on the ADS801U uses pins 26 (IN) and 27 (IN) referenced to the internal +2.25V common-mode voltage (pin 22, CM). Each input swings ±1V around CM, yielding a 4V_p-p differential full-scale range. The device accepts either transformer-coupled (AC-coupled) or active op-amp–driven (DC-coupled) differential signals. Single-ended mode is possible by tying IN to CM, but increases even-order harmonics and is not recommended for high-fidelity applications.

What output data formats does the ADS801U support?

The ADS801U supports two output coding formats: Straight Offset Binary (SOB) and Binary Two's Complement (BTC). SOB is the default (pin 19 MSBI = LOW or floating), where full-scale positive input yields all "1"s (111111111111). BTC is selected by driving MSBI HIGH, which inverts the MSB only. Both formats are delivered as 12-bit parallel CMOS outputs (pins 2–13), with three-state control via OE (pin 18) for bus sharing.

Is the ADS801U still in active production?

The ADS801U is marked as "Obsolete" in TI's official packaging addendum (as of November 2025), though it remains available through authorized distributors and Aetrix Electronics' legacy component program. Aetrix maintains traceable inventory with full lot documentation and provides lifecycle coordination support - including last-time-buy planning and drop-in alternative evaluation - for customers sustaining industrial, medical, and broadcast equipment using the ADS801U.