ADS7846E/2K5G4

Overview

The ADS7846E/2K5G4 is a resistive touch screen controller manufactured by Texas Instruments, belonging to the ADS7846 series. It features a 12-bit analog-to-digital converter with a sampling rate of 125 kS/s and supports serial 3-wire SPI interfaces. The device operates on a supply voltage range of 2.2 V to 5.25 V and includes an internal 2.5 V reference. Designed for surface-mount installation, it utilizes a 16-lead SSOP package (DBQ) with a shrink pitch. The component supports direct battery voltage measurement up to 6 V and temperature monitoring, functioning within an industrial temperature range of -40°C to +85°C.

Feature Summary

• 12-bit resolution ADC with 125 kS/s sampling rate
• Integrated 2.5 V internal reference voltage source
• Serial 3-wire SPI interface compatibility
• Direct battery voltage measurement capability (0V to 6V)

Applications

• Personal Digital Assistants (PDA)
• Portable instruments
• Point-of-sale terminals
• Mobile phones

Procurement Notes

Verify the specific suffix 'G4' against official Texas Instruments documentation to confirm RoHS compliance status and pinout equivalence to the standard ADS7846E variant. Confirm current production lifecycle status as distribution channels may list this part as obsolete or end-of-life. Ensure the SSOP-16 package dimensions match the design requirements before procurement.

Selection Notes

Select the ADS7846E/2K5G4 when a 12-bit resolution is required for 4-wire resistive touch screens in space-constrained designs. The SSOP-16 package offers a compact footprint suitable for portable electronics. Consider the internal 2.5 V reference if external components must be minimized, and verify that the 2.2 V to 5.25 V supply range aligns with the system's power architecture.

Part Context

This component is part of the ADS7846 family, which serves as a successor to the ADS7843. It maintains pin compatibility with previous generations while adding features like integrated references and improved power management. The '/2K5' designation indicates tape-and-reel packaging containing 2,500 units per reel, facilitating automated assembly processes.

Replacement Considerations

The ADS7846E is a direct pin-compatible replacement for the ADS7843. Verify datasheet specifications for any functional differences regarding register configurations or timing parameters when substituting older variants.