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Product Detailed Parameters
- Description：IC SCREEN CNTRL 12BIT 16LFCSP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tray
- Touchscreen：4 Wire Resistive
- Resolution (Bits)：12 b
- Interface：Serial
- Voltage Reference：External, Internal
- Voltage - Supply：2.2V ~ 5.25V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：16-VQFN Exposed Pad, CSP
- Supplier Device Package：16-LFCSP-VQ (4x4)
- Current - Supply：-
- Grade：-
- Qualification：-
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Overview
The AD7873ACPZ is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitizer applications. It integrates low on-resistance switches, an internal 2.5 V reference, and a temperature sensor. Operating from a single 2.2 V to 5.25 V supply, it achieves throughput rates up to 125 kSPS with a synchronous serial interface. The device supports direct battery measurement (0 V to 6 V), touch pressure sensing, and one auxiliary analog input. Shutdown mode reduces current consumption to less than 1 µA. It is housed in a 16-lead Lead Frame Chip Scale Package (LFCSP).
Feature Summary
- 12-bit resolution with 125 kSPS throughput rate.
- Integrated 4-wire touch screen interface with low on-resistance switches.
- On-chip 2.5 V reference and temperature sensor (-40°C to +85°C).
- Direct battery monitor input supporting 0 V to 6 V range.
- Shutdown mode with maximum current consumption of 1 µA.
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sale terminals
- Pagers
Procurement Notes
Verify the specific suffix ACPZ corresponds to the 16-lead LFCSP package variant when sourcing. Confirm RoHS compliance status through official manufacturer documentation or authorized distributors, as environmental declarations may vary by production batch. Ensure the source provides valid traceability for this component type.
Selection Notes
Select the AD7873ACPZ for systems requiring integrated touch screen driving capabilities alongside ADC conversion. The LFCSP package offers space-saving advantages for compact designs. Ensure the application voltage stays within the 2.2 V to 5.25 V range. Consider the internal reference stability if external precision references are not utilized for critical accuracy requirements.
Part Context
The AD7873 belongs to the Analog Devices AD7873 series of touch screen controllers. This family includes variants such as the AD7873ARQ and AD7873BRQZ, which share similar functional architectures but differ in package types like QSOP or TSSOP. The AD7873 serves as a specialized solution for battery-powered portable electronics requiring efficient touch input processing.
Replacement Considerations
Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should consult Analog Devices for current equivalent recommendations or verify compatibility with alternative resistive touch screen controllers that match the pinout and electrical specifications.
