ADS7805P

Analog To Digital Converters (ADC) Overview

The ADS7805P is a 16-bit, 100kHz sampling Analog-to-Digital Converter (ADC) from Texas Instruments. It utilizes a CMOS Successive Approximation Register (SAR) architecture with an integrated Sample-and-Hold circuit. The device features a standard ±10V input range and operates on a single +5V supply, dissipating a maximum of 100mW. It provides full parallel data output in Binary Two’s Complement format via tri-state drivers. Key performance metrics include a minimum Signal-to-Noise and Distortion Ratio (SINAD) of 83dB at a 20kHz input frequency and Integral Non-Linearity (INL) of ±4 LSB. The component is housed in a 28-pin DIP package and is specified for operation over the industrial temperature range of -25°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• 16-bit resolution with 100kHz throughput rate and 10µs conversion cycle time
• Standard ±10V analog input range with internal laser-trimmed scaling resistors
• Single +5V supply operation with power dissipation under 100mW
• Full parallel 16-bit data output with tri-state drivers and BYTE pin for byte-wise reading

Analog To Digital Converters (ADC) Applications

• Industrial process control systems requiring high-resolution analog signal acquisition
• Data acquisition systems utilizing microprocessor interfaces
• Precision measurement equipment needing low-power 16-bit ADC solutions

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific grade suffix when ordering; the 'P' designation indicates the standard ±4 LSB INL version, while 'PB' denotes the higher precision ±3 LSB variant. Confirm package availability as the DIP-28 form factor may have limited production status compared to SOIC options. Ensure compatibility with existing board layouts for the 0.3-inch DIP footprint before procurement.

Analog To Digital Converters (ADC) Selection Notes

Select the ADS7805P for applications requiring a parallel interface and ±10V input range without external reference buffering. Choose the ADS7805PB if tighter linearity specifications (±3 LSB INL) are critical. Consider the ADS7805U/UB variants if surface-mount packaging is required. Ensure the system design accommodates the need for separate analog and digital grounding planes to maintain specified SNR performance.

Analog To Digital Converters (ADC) Part Context

The ADS7805 belongs to the ADS7805 family of 16-bit CMOS ADCs. It is pin-compatible with the 12-bit ADS7804, facilitating upgrades in existing designs. The device integrates a 2.5V internal reference, though it supports external references between 2.3V and 2.7V. It serves as a complete solution by including the SAR converter, clock logic, and output latches in a single package.

Analog To Digital Converters (ADC) Replacement Considerations

The ADS7805P is directly replaceable by the ADS7805PB for improved linearity within the same package. For surface-mount requirements, the ADS7805U or ADS7805UB offers identical electrical characteristics in an SOIC-28 package. Cross-model replacement with the ADS7804 is possible due to pin compatibility but involves a reduction in resolution from 16 bits to 12 bits.