Texas Instruments ADS7806UB

Overview

ADS7806UB from Texas Instruments is a low-power, 12-bit sampling CMOS analog-to-digital converter (ADC) featuring a capacitor-based successive approximation register (SAR), integrated sample-and-hold, internal +2.5V reference, and parallel/serial digital outputs. It achieves full 12-bit accuracy in ≤25 µs while consuming ≤35 mW at 40 kHz throughput, supports ±10V, 0V–+5V, and 0V–+4V input ranges, and operates over –40°C to +85°C in SO-28 package - used in precision industrial data acquisition systems requiring single-supply operation and flexible interface options.

For engineers reviewing the ADS7806UB datasheet, ADS7806UB pinout, ADS7806UB application, or ADS7806UB equivalent, this page delivers verified technical context, exact pin functions, real-world use cases, and validated alternative parts - all grounded in TI's SBAS021B production data sheet and ordering specifications for the ADS7806UB/1K tape-and-reel variant.

Technical Context

The ADS7806UB implements a fully integrated SAR architecture with on-chip capacitor DAC, comparator, control logic, and dual-mode output drivers. Its internal 2.5V reference (±0.1% initial accuracy, 8 ppm/°C drift) supports unbuffered external use or direct internal conversion, and laser-trimmed scaling resistors enable precise ±10V, 0V–+5V, and 0V–+4V range selection without external components.

It features two independent digital interfaces: parallel 12-bit output via byte-selectable D7–D0 pins (MSB-first or LSB-first depending on BYTE pin state), and serial output synchronized to either internal ~900 kHz clock (via DATACLK output) or external clock up to 10 MHz (via DATACLK input), with configurable data format (Straight Binary or Binary Two's Complement) via SB/BTC pin.

Key Specifications

Pinout & Package

ADS7806UB is housed in a 28-pin SOIC (SO-28) package, 0.3" wide, fully specified for industrial temperature range (–40°C to +85°C). Pinout matches ADS7806U/UB variants and is pin-compatible with ADS7807 (16-bit version) for layout reuse.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS7805UB and ADS8320EB, the ADS7806UB uniquely balances integrated reference, dual parallel/serial interface, SO-28 pin compatibility with ADS7807, and proven 12-bit industrial performance - making it optimal for cost-sensitive, space-constrained DAQ systems requiring design reuse and minimal external components.

Availability

ADS7806UB is available at Aetrix Electronics and suitable for industrial process monitoring, motor control feedback, test & measurement equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for ADS7806UB 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-reliability ICs, with decades of expertise in precision data converters and industrial-grade signal chain solutions.

The ADS7806UB belongs to TI's precision SAR ADC product line, designed specifically for industrial data acquisition systems demanding low power, flexible interfacing, and robust performance across extended temperature ranges.

FAQ

What is the maximum sampling rate supported by the ADS7806UB?

The ADS7806UB supports a maximum throughput rate of 40 kHz, meaning it can complete a full acquisition-and-conversion cycle every 25 µs. This is confirmed in the Electrical Characteristics table (SBAS021B, p.2) under "Throughput Rate" for ADS7806UB grade. At this rate, the ADS7806UB maintains its specified 72 dB SINAD and ±0.45 LSB INL performance across the industrial temperature range.

Does the ADS7806UB require an external reference voltage?

No, the ADS7806UB does not require an external reference voltage because it integrates a factory-trimmed +2.5V reference with ±0.1% initial accuracy and 8 ppm/°C drift. However, the REFD pin allows disabling the internal reference (by driving REFD HIGH), enabling use of a higher-precision external reference - a capability explicitly documented in the Reference section of SBAS021B (p.3).

Is the ADS7806UB pin-compatible with other devices in the ADS78xx family?

Yes, the ADS7806UB is pin-compatible with the 16-bit ADS7807 in the same SO-28 package, as stated in the Features list ("PIN-COMPATIBLE WITH THE 16-BIT ADS7807"). This allows hardware reuse across resolution tiers. It is also functionally and physically compatible with ADS7806U and ADS7806PB variants, differing only in AC performance grade (INL/SINAD) and packaging - confirmed in the PACKAGE/ORDERING INFORMATION table (p.2).

How does the BYTE pin affect parallel data output on the ADS7806UB?

The BYTE pin on the ADS7806UB controls multiplexing of the D7–D0 pins: when BYTE is LOW, D7–D0 output the eight most significant bits (MSBs) of the 12-bit result; when BYTE is HIGH, D7–D0 output the four least significant bits (LSBs). This is defined in the PIN DESCRIPTIONS (p.4) and illustrated in Figure 1a (p.7) of SBAS021B - enabling 12-bit reads using only 8 data lines.

What is the purpose of the PWRD pin on the ADS7806UB?

When driven HIGH, the PWRD pin on the ADS7806UB shuts down all analog circuitry except the internal reference, reducing total supply current to 50 µW while keeping digital logic active. This allows rapid wake-up (<1 ms recovery to rated accuracy, per p.2 note 5) - a feature explicitly specified in the FEATURES list and Electrical Characteristics table under "PWRD and REFD HIGH" (p.3).