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Maxim > Products > Analog-to-Digital Converters 
MAX1280, MAX1280B, MAX1281, MAX1281B
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference


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Data Sheet
FULL DATA SHEET (PDF, 360kB)
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Description
The MAX1280/MAX1281 12-bit ADCs combine an 8-channel analog-input multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX1280 operates from a single +4.5V to +5.5V supply; the MAX1281 operates from a single +2.7V to +3.6V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/pseudo-differential operation.

The 4-wire serial interface connects directly to SPI™/QSPI™/MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1280/MAX1281 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. Both parts feature an internal +2.5V reference and a reference-buffer amplifier with a ±1.5% voltage-adjustment range. An external reference with a 1V to VDD1 range may also be used.

The MAX1280/MAX1281 provide a hard-wired active-low SHDN pin and four software-selectable power modes (normal operation, reduced power, fast power-down, and full power-down). These devices can be programmed to automatically shut down at the end of a conversion or to operate with reduced power. When using the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turn-on time allows them to be powered down between all conversions. This technique can cut supply current to under 100µA at reduced sampling rates.

The MAX1280/MAX1281 are available in 20-pin TSSOP packages. These devices are higher-speed versions of the MAX146/MAX147 (for more information, see the respective data sheet).

Key Features   Applications/Uses
  • 8-Channel Single-Ended or 4-Channel Pseudo-Differential Inputs
  • Internal Multiplexer and Track/Hold
  • Single-Supply Operation
    • +4.5V to +5.5V (MAX1280)
    • +2.7V to +3.6V (MAX1281)
  • Internal +2.5V Reference
  • 400ksps Sampling Rate (MAX1280)
  • Low Power 2.5mA (400ksps)
    • 1.3mA (Reduced-Power Mode)
    • 0.9mA (Fast Power-Down Mode)
    • 2µA (Full Power-Down)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible
    • 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin TSSOP Package

 
  		• Battery-Powered Applications
  		• Data Acquisition
  		• Medical Instruments
  		• Pen Digitizers
  		• Portable Data Logging
  		• Process Control

    Key Specifications:   Precision ADCs (< 5Msps)
    Part Number ADC Resolution (Bits) Input Channels Conv. Rate (ksps) Max. Conv. Time (µs) Data Bus (Bits) Ref. (V) Diff. In Supply Voltage (V) Typ. Supply Current (mA) Typ. Power (mW) Low Power Mode Standby Mode EV-Kit RoHS Available Package Operating Temp. Range (°C) Price**
    MAX1280  12 8 400 2.5 Serial Ext
    Int +2.5     		Yes 5 2.5 13.75 Yes Yes No Yes TSSOP/20 -40 to +85
    0 to +70     		$5.24 @ 1k
    MAX1281  300 3.3 3
    3.3     		8 $5.24 @ 1k
    See All Precision ADCs (< 5Msps) (301)
    Notes:
    **This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

    Application Notes
  		• Application Note 748: The ABCs of ADCs: Understanding How ADC Errors Affect System Performance - MAX1280, MAX1281
  		• Application Note 1080: Understanding SAR ADCs - MAX1280

    Evaluation Kits
  		• MAX1280EVC16, MAX1280EVKIT

    Design Guides
  		• A/D CONVERTERS (PDF)

    Reliability Reports
  		• Show FIT data for:
  		• Request Reliability Report for:

    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: 1-16 of 16

    MAX1280B Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1280BCUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1280BCUP+T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1280BCUP+  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1280BCUP-T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1280BEUP+T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1280BEUP+  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1280BEUP-T  



    		-40°C to +85°C See data sheet
    MAX1280BEUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1281B Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1281BCUP-T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1281BCUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1281BCUP+  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1281BCUP+T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1281BEUP-T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1281BEUP  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1281BEUP+  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1281BEUP+T  
    		TSSOP;20 pin;
    Dwg: 21-0066J (PDF)
    Use pkgcode/variation: U20+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• New Product Press Release 2000-04-26 

    Related Products
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    MAX1084, MAX1084A, MAX1084B, MAX1085, MAX1085A, MAX1085B 400ksps/300ksps, Single-Supply, Low-Power, Serial 10-Bit ADCs with Internal Reference
    MAX1282, MAX1282A, MAX1282B, MAX1283, MAX1283A, MAX1283B 300ksps/400ksps, Single-Supply, 4-Channel, Serial 12-Bit ADCs with Internal Reference
    MAX1080, MAX1080A, MAX1080B, MAX1081, MAX1081A, MAX1081B 300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference
    MAX1082, MAX1082A, MAX1082B, MAX1083, MAX1083A, MAX1083B 300ksps/400ksps, Single-Supply, 4-Channel, Serial 10-Bit ADCs with Internal Reference

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    Document Ref.: 19-1684; Rev 0; 2000-06-15
    This page last modified: 2007-06-05




             


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