AD7843ARQZ

$4.42

Description：IC SCREEN CNTRL 12BIT 16QSOP
Series：-

SKU:c391a6410b05 Category: Touch Screen Controllers Brand: Analog Devices Inc.

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Product introduction

Product Detailed Parameters

Description：IC SCREEN CNTRL 12BIT 16QSOP
Series：-
Mfr：Analog Devices Inc.
Package：Tube
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：-

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AD7843ARQZ

Overview

The AD7843ARQZ is a 12-bit successive approximation analog-to-digital converter (ADC) designed for touch screen digitizer applications. It features a synchronous serial interface and low on-resistance switches for driving resistive touch screens. The device operates from a single supply voltage ranging from 2.2 V to 5.25 V, with specified performance guaranteed between 2.7 V and 3.6 V. It achieves throughput rates up to 125 kSPS while consuming a maximum of 380 µA at 125 kSPS with a 3.6 V supply. The part includes two auxiliary analog inputs and supports programmable 8-bit or 12-bit resolution. It is housed in a 16-lead QSOP package.

Feature Summary

12-bit SAR ADC with 125 kSPS throughput rate
Single supply operation from 2.2 V to 5.25 V
Integrated 4-wire touch screen interface with low on-resistance switches
Programmable 8-bit or 12-bit resolution via control register
Shutdown mode with maximum current consumption of 1 µA

Applications

Personal digital assistants
Smart hand-held devices
Touch screen monitors
Point-of-sales terminals
Pagers

Procurement Notes

Verify the package type matches the 'Q' suffix designation, which corresponds to the 16-lead Quarter Size Outline Package (QSOP). Confirm that the 'A' version meets the required operating temperature range of −40°C to +85°C. Ensure the external reference voltage applied to the VREF pin falls within the 1.0 V to +VCC range for proper functionality.

Selection Notes

Select this component when a low-power, single-supply ADC with integrated touch screen drivers is required. The ratiometric conversion mode eliminates errors caused by internal switch resistances, making it suitable for resistive touch panels. Consider the 125 kSPS speed limit and the need for an external clock source on the DCLK pin during system design.

Part Context

The AD7843ARQZ belongs to the Analog Devices AD7843 family of touch screen controllers. The 'ARQZ' designation indicates the 'A' grade version, the 'R' reel packaging option, the 'Q' QSOP package, and the 'Z' lead-free status. This specific part number represents the quarter-size outline package variant of the broader AD7843 series.