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Maxim > Products > [Analog-to-Digital Converters] 
MXB7843
2.375V to 5.25V, 4-Wire Touch-Screen Controller


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 528kB)
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Description
The MXB7843 is an industry-standard 4-wire touch-screen controller. It contains a 12-bit sampling analog-to-digital converter (ADC) with a synchronous serial interface and low on-resistance switches for driving resistive touch screens. The MXB7843 uses an external reference. The MXB7843 can make absolute or ratiometric measurements. The MXB7843 has two auxiliary ADC inputs. All analog inputs are fully ESD protected, eliminating the need for external TransZorb™ devices.

The MXB7843 is guaranteed to operate with a single 2.375V to 5.25V supply voltage. In shutdown mode, the typical power consumption is reduced to under 0.5µW, while the typical power consumption at 125ksps throughput and a 2.7V supply is 650µW.

Low-power operation makes the MXB7843 ideal for battery-operated systems, such as personal digital assistants with resistive touch screens and other portable equipment. The MXB7843 is available in 16-pin QSOP and TSSOP packages, and is guaranteed over the -40°C to +85°C temperature range.

Key Features   Applications/Uses
  • ESD-Protected ADC Inputs
    • ±15kV IEC 61000-4-2 Air-Gap Discharge
    • ±8kV IEC 61000-4-2 Contact Discharge
  • Pin Compatible with MXB7846
  • +2.375V to +5.25V Single Supply
  • 4-Wire Touch-Screen Interface
  • Ratiometric Conversion
  • SPI™/QSPI™, 3-Wire Serial Interface
  • Programmable 8-/12-Bit Resolution
  • Two Auxiliary Analog Inputs
  • Automatic Shutdown Between Conversions
  • Low Power
    • 270µA at 125ksps
    • 115µA at 50ksps
    • 25µA at 10ksps
    • 5µA at 1ksps
    • 2µA Shutdown Current

 
  		• Cell Phones
  		• Pagers
  		• PDAs and Other Handheld Devices
  		• Point-of-Sale Terminals
  		• Portable Instrumentation
  		• Touch-Screen Monitors

    Key Specifications:  Touch Interface Products
    Part Number Conv. Rate
    (ksps)    		 Interface ISUPPLY
    (µA)    		 Power
    (µW)    		 Ref.
    (V)    		 VSUPPLY
    (V)    		 EV Kit Package/Pins Oper. Temp.
    (°C)    		 Price
    typ typ See Notes
    MXB7843  125
    QSPI
    SPI
    		 270 641 Ext. 2.375 to 5.25 Yes
    QSOP/16
    TSSOP/16
    		 -40 to +85 $1.57 @1k
    See All Touch Interface Products (10)

    Diagram
    MXB7843: Typical Application Circuit
    Typical Application Circuit

    Reliability Reports
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    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-8 of 8

    MXB7843 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MXB7843EEE    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16-5*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MXB7843EEE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MXB7843EEE+  
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MXB7843EEE+T    
    		Active QSOP;16 pin;31 mm²
    Outline Drawing: 21-0055 (PDF)
    Land Pattern: 90-0167 (PDF)
    Use pkgcode/variation: E16+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MXB7843EUE    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MXB7843EUE-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MXB7843EUE+  
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MXB7843EUE+T    
    		Active TSSOP;16 pin;33 mm²
    Outline Drawing: 21-0066 (PDF)
    Land Pattern: 90-0117 (PDF)
    Use pkgcode/variation: U16+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2002-05-31 

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    Document Ref.: 19-2435; Rev 1; 2005-09-27
    This page last modified: 2009-10-14


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