ChipApex | Global Electronic Components Supplier
SEARCH
Search Product
Search Post
— IC芯片 | 连接器 | 传感器 | 被动器件 —
Consult the customer manager about the wholesale price.
consultation hotline：86-132-6715-2157
email：[email protected]
Contact the product manager for consultation. One-stop consultation is available.
Do you want a lower wholesale price? Please send us your inquiry and we will reply immediately.
Product Detailed Parameters
- Description：IC SCREEN CNTRL 12BIT 16QSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tape & Reel (TR),Cut Tape (CT)
- Touchscreen：4 Wire Resistive
- Resolution (Bits)：12 b
- Interface：Serial
- Voltage Reference：External
- Voltage - Supply：2.2V ~ 5.25V
- Operating Temperature：-40°C ~ 85°C
- Mounting Type：Surface Mount
- Package / Case：16-SSOP (0.154", 3.90mm Width)
- Supplier Device Package：16-QSOP
- Current - Supply：-
- Grade：-
- Qualification：-
Download product information
Overview
The AD7843ARQZ-REEL7 is a 12-bit successive approximation analog-to-digital converter (ADC) designed for touch screen digitizer applications. It operates from a single supply voltage ranging from 2.2 V to 5.25 V and supports throughput rates up to 125 kSPS. The device features a synchronous serial interface, programmable resolution of 8 or 12 bits, and two auxiliary analog inputs. It includes on-board switches with low on-resistance for driving resistive touch screens and offers a shutdown mode with maximum current consumption of 1 µA. The component is housed in a 16-lead QSOP package.
Feature Summary
- 12-bit ADC with specified throughput rate of 125 kSPS
- Single supply operation from 2.2 V to 5.25 V
- Ratiometric conversion mode available
- Shutdown mode reduces current consumption to 1 µA max
Applications
- Personal digital assistants
- Smart hand-held devices
- Touch screen monitors
- Point-of-sales terminals
- Pagers
Procurement Notes
Verify the specific package type and revision level against the datasheet Rev. B specifications. Confirm that the external reference voltage range aligns with the 1.0 V to +VCC requirement. Ensure proper decoupling capacitors are used on the supply pins as indicated in typical connection diagrams. Check for ESD sensitivity precautions during handling.
Selection Notes
Select this component for battery-powered systems requiring low power consumption and high-speed touch screen control. Consider the ratiometric mode for eliminating errors due to on-board switch resistances. Ensure the external clock frequency does not exceed 2 MHz. Verify that the analog input range matches the applied VREF.
Part Context
The AD7843 is part of Analog Devices' touch screen controller family. It integrates a track-and-hold amplifier, multiplexer, and SAR ADC. The ARQZ suffix indicates the A grade version in a 16-lead QSOP package. The REEL7 suffix denotes tape and reel packaging for automated assembly.
Replacement Considerations
Direct substitutes within the same family include the AD7873 and AD7877. Cross-model comparisons should account for differences in interface types and sampling rates. Verify pin compatibility and electrical specifications before substitution.
