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Product Detailed Parameters
- Description：IC ADC 12BIT TOUCHSCREEN 16LFCSP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Bulk
- 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-REEL7 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 exceeding 125 kSPS with a synchronous serial interface. The device supports direct battery measurement up to 6 V and includes a shutdown mode reducing current consumption to less than 1 µA.
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 measurement input (0 V to 6 V)
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sale terminals
Procurement Notes
Verify the package type matches the 'ACP' suffix, which indicates the 16-lead Lead Frame Chip Scale Package (LFCSP). Confirm the 'REEL7' suffix corresponds to the specific tape and reel quantity required for the manufacturing line. Ensure the operating environment stays within the specified -40°C to +85°C range for guaranteed performance.
Selection Notes
Select this component when a compact solution for resistive touch screens is needed. The LFCSP package offers space savings compared to QSOP or TSSOP options. Consider the internal 2.5 V reference if external precision references are not available; otherwise, an external reference between 1 V and VCC can be applied to the VREF pin.
Part Context
This part belongs to the AD7873 family of touch screen controllers. It shares functional similarities with the AD7843 but offers integrated touch screen driving switches. Other variants in the series include different package options like QSOP and TSSOP, as well as the AD7877 which adds a DAC output.
Replacement Considerations
The AD7873ARUZ and AD7873BRQZ are functionally equivalent parts within the same family but utilize TSSOP and QSOP packages respectively. Verify that the PCB footprint accommodates the LFCSP package dimensions (4 mm × 4 mm) if substituting with these alternatives.
