ADS7805U

Analog To Digital Converters (ADC) Overview

The ADS7805U is a 16-bit, single-channel Analog-to-Digital Converter (ADC) utilizing a Successive Approximation Register (SAR) architecture. It features a standard ±10V input range and operates from a single +5V supply with maximum power dissipation of 100mW. The device supports a minimum sampling rate of 100kHz and provides full parallel data output via tri-state drivers. Key performance metrics include a Signal-to-Noise and Distortion Ratio (SINAD) of 83dB (min) to 86dB (typ) at 20kHz input, Integral Nonlinearity (INL) of ±4 LSB (standard) or ±3 LSB (high grade), and Differential Nonlinearity (DNL) ensuring no missing codes across the 16-bit range.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 100kHz throughput rate and ±10V analog input range
• Single +5V supply operation with internal or external reference options
• Full parallel 16-bit data output with tri-state drivers and BYTE pin for byte-wise reading
• Inherent overvoltage protection up to ±25V via resistive front-end network

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring high-resolution signal acquisition
• Data acquisition systems with microprocessor interfaces
• Precision measurement equipment utilizing ±10V sensor inputs
• Battery-powered instrumentation benefiting from low power consumption

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific linearity grade required for the application, as the ADS7805U package designation covers both standard (±4 LSB INL) and high-grade (±3 LSB INL) variants. Confirm the ordering suffix matches the desired packaging quantity, such as tube (28 units) or tape and reel (1000 units). Ensure the design accounts for the SOIC-28 thermal resistance of 75°C/W when operating within the specified -25°C to +85°C temperature range.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7805U when a 16-bit SAR ADC with a wide ±10V input range is necessary without requiring bipolar supplies. Compare against the ADS7804 if 12-bit resolution is sufficient, noting the pin compatibility. Consider the internal reference drift of 8 ppm/°C; for higher precision, an external reference between 2.3V and 2.7V may be used. Evaluate the need for hardware calibration resistors versus software correction based on the required offset and gain accuracy.

Analog To Digital Converters (ADC) Part Context

The ADS7805U belongs to the ADS7805 family of 16-bit CMOS ADCs manufactured by Texas Instruments. It is part of a series that includes DIP-28 (ADS7805P/UB) and SOIC-28 (ADS7805U/UB) packages. The device is designed to be pin-compatible with the 12-bit ADS7804, facilitating upgrades in existing designs. It utilizes a capacitor-based SAR structure with integrated sample-and-hold, clock, and reference circuits.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS7805U is functionally pin-compatible with the ADS7804, allowing for potential migration if resolution requirements change. No direct cross-model replacements are listed in the provided documentation; however, designers should verify that any substitute maintains the 100kHz sampling rate, ±10V input range, and SOIC-28 footprint.