AD7877ACP-500RL7

Overview

The AD7877ACP-500RL7 is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitization. It integrates low on-resistance switches, an internal 2.5 V reference, and an 8-bit digital-to-analog converter (DAC). Operating from a single 2.7 V to 5.25 V supply with a throughput rate of 125 kSPS, the device supports direct battery measurement, temperature sensing, and auxiliary analog inputs. It features a synchronous serial interface, programmable conversion parameters, and a shutdown mode consuming less than 1 µA.

Feature Summary

• 12-bit ADC with 125 kSPS throughput and SPI-compatible serial interface
• Integrated 4-wire touch screen interface with low resistance switches
• On-chip 2.5 V reference, 8-bit DAC, and temperature sensor (-40°C to +85°C)
• Dual battery monitoring channels (0.5 V to 5 V) and three auxiliary analog inputs

Applications

• Personal digital assistants
• Smart hand-held devices
• Touch screen monitors
• Point-of-sale terminals
• Medical devices

Procurement Notes

Verify the specific package variant against the datasheet ordering guide, as the AD7877 family includes both 32-lead LFCSP and 25-ball WLCSP options. Confirm that the suffix corresponds to the reel packaging format required for the manufacturing line. Ensure compatibility with the host system's voltage levels via the separate VDRIVE pin.

Selection Notes

Select this component for battery-powered systems requiring integrated touch control and power management. The device supports both slave and master modes via its sequencer. Consider the separate VDRIVE level for the serial interface if the host logic operates at a different voltage than the analog supply. Verify thermal requirements for the LFCSP or WLCSP package based on the application's power dissipation limits.

Part Context

This part belongs to the AD7877 series of touch screen controllers manufactured by Analog Devices Inc. The 'ACPZ' designation indicates a lead-free, RoHS-compliant 32-lead LFCSP package. The '-500RL7' suffix specifies the tape and reel packaging quantity and format. The device is qualified for automotive applications according to the manufacturer's specifications.

Replacement Considerations

Direct substitutes within the same family include AD7877ACPZ-REEL7 and AD7877ACPZ-500RL7. These parts share identical electrical characteristics and pinouts but may differ in packaging quantities or minor revision updates. Verify the specific package type (LFCSP vs. WLCSP) when selecting alternatives.