ADS7805PBG4

Analog To Digital Converters (ADC) Overview

The ADS7805PBG4 is a 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. It features a single-ended ±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, achieving a typical Signal-to-Noise and Distortion Ratio (SINAD) of 86dB at a 20kHz input frequency. Integral Non-Linearity (INL) is specified at ±3 LSB for the high-grade variant. It utilizes a full parallel data output interface in binary two's complement format and includes an internal 2.5V reference or external reference capability.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 100kHz throughput rate and ±10V standard input range
• Single +5V supply operation with 100mW maximum power dissipation
• Internal SAR architecture with integrated sample-and-hold, clock, and reference
• Full parallel 16-bit data output with tri-state drivers and BYTE pin control

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring high-resolution analog input
• Data acquisition systems with single-supply constraints
• Precision measurement instrumentation utilizing ±10V signal ranges

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific grade suffix 'B' indicates the ±3 LSB INL specification rather than the standard ±4 LSB version. Confirm package designation matches SOIC-28 or DIP-28 requirements as the 'G4' suffix typically denotes lead-free and RoHS compliance in Texas Instruments nomenclature. Ensure ordering documentation aligns with the active status listed for the base ADS7805 family.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a 16-bit resolution and 100kHz sampling speed are required within a single +5V supply system. Choose the high-grade variant if integral non-linearity tighter than ±4 LSB is necessary for application accuracy. Consider software calibration if external trimming resistors are undesirable, noting that untrimmed offset errors may reach -30mV.

Analog To Digital Converters (ADC) Part Context

The ADS7805 belongs to the ADS78XX series of CMOS analog-to-digital converters. It is pin-compatible with the 12-bit ADS7804, facilitating design upgrades without PCB layout changes. The device integrates capacitor-based SAR conversion logic, eliminating the need for external clock or reference circuits in basic configurations.

Analog To Digital Converters (ADC) Replacement Considerations

ADS7805U/1K: SOIC-28 tape and reel variant with identical electrical specifications.

Analog To Digital Converters (ADC) FAQ

How does the BYTE pin affect data output?

The BYTE pin controls the order of byte transmission on the parallel bus. When HIGH, it outputs the least significant byte first; when LOW, it outputs the most significant byte first.

What is the function of the CAP pin?

The CAP pin is the output of the internal reference buffer. A 2.2µF capacitor should be connected here to provide switching currents for the CDAC and stabilize the reference voltage.

Can the ADS7805 operate without external calibration resistors?

Yes, hardware trim resistors are optional. Without them, the device relies on software calibration to correct typical offset errors of -30mV and gain errors of -1.5%.