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Product Detailed Parameters
- Description：IC ADC 12BIT TOUCHSCREEN 16LFCSP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bag
- Touchscreen：-
- Resolution (Bits)：12 b
- Interface：-
- 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 AD7873ACP is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitizer applications. It operates from a single 2.2 V to 5.25 V supply and supports throughput rates up to 125 kSPS. The device integrates on-chip switches, a 2.5 V reference, and a temperature sensor. Key specifications include a maximum integral nonlinearity of ±2 LSB, an internal reference voltage range of 2.45 V to 2.55 V, and a shutdown current of less than 1 µA. It utilizes a synchronous serial interface and is housed in a 16-lead LFCSP package.
Feature Summary
- 12-bit resolution with 125 kSPS throughput rate
- Integrated 2.5 V reference and on-chip temperature sensor (-40°C to +85°C)
- Direct battery measurement capability (0 V to 6 V input)
- Low power consumption: <1 µA in shutdown mode
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sale terminals
- Pagers
Procurement Notes
Verify the specific suffix 'ACP' against the manufacturer's ordering guide to confirm the exact package type and temperature grade. Confirm RoHS compliance status and check for end-of-life notifications or alternative package options such as QSOP or TSSOP if lead availability is constrained.
Selection Notes
Select this component for systems requiring integrated touch screen driving switches and low power operation. Ensure the external source impedance allows for the required 3 DCLK acquisition time at the target sampling rate. Verify that the system voltage falls within the 2.2 V to 5.25 V operating range for specified performance.
Part Context
The AD7873 belongs to the Analog Devices AD7843/AD7873 family of touch screen controllers. It shares functional similarities with the AD7843 but offers higher resolution and integrated features like the on-board temperature sensor and battery monitor. The ACP suffix specifically denotes the Lead Frame Chip Scale Package (LFCSP) variant.
Replacement Considerations
The AD7873ARQZ and AD7873BRQZ are available in QSOP packages. The AD7873ARUZ and AD7873BRUZ are available in TSSOP packages. These variants share identical electrical specifications and pinouts, differing only in the physical package outline.
