ADS7843EG4

Overview

The ADS7843EG4 is a 12-bit resolution, serial output sampling Analog-to-Digital Converter (ADC) manufactured by Texas Instruments. Designed primarily as a touch screen controller for 4-wire resistive displays, it features an internal sample-and-hold circuit and operates on a single power supply ranging from 2.7 V to 5.5 V. The device utilizes a high-speed serial interface compatible with standard SPI, QSPI, MICROWIRE, and digital logic standards. It incorporates a low-power shutdown mode that reduces current consumption significantly when the device is not in use.

Feature Summary

• 12-bit resolution with a typical conversion time of 7 µs
• Integrated sample-and-hold circuit for accurate signal capture
• Serial interface compatible with SPI, QSPI, and MICROWIRE protocols
• Low power consumption: 2 mW at 5 V with 10 kSPS sampling rate

Applications

• Handheld instruments and portable devices requiring touch input
• Industrial process control systems with operator interfaces
• Automotive infotainment and display control units
• Medical equipment with graphical user interfaces

Procurement Notes

Verify the specific package variant, as EG4 denotes a 16-lead SSOP package. Confirm RoHS compliance status and lead-free manufacturing details against the latest datasheet revision. Check for automotive qualification if the application requires AEC-Q100 standards, noting that the standard ADS7843 may differ from the ADS7843-Q1 variant.

Selection Notes

Select this component when a 4-wire resistive touch screen interface is required with moderate speed and precision. Ensure the system voltage falls within the 2.7 V to 5.5 V range. Compare against the ADS7846 if additional channels or different pinouts are needed, and verify that the serial clock frequency supports the desired touch polling rate.

Part Context

The ADS7843 belongs to the ADS784x family of touch screen controllers from Texas Instruments. It shares architectural similarities with the ADS7844, ADS7845, and ADS7846, differing primarily in channel count and pin configuration. The EG4 suffix indicates a lead-free, RoHS-compliant version of the standard ADS7843E part.

Replacement Considerations

The ADS7846 is a common alternative offering similar functionality but with a different pinout and additional features. Verify pin compatibility before substitution. For automotive applications, consider the ADS7843-Q1 which meets AEC-Q100 reliability standards.