CMOS, 20µs, 8-Bit, 8-Channel Data Acquisition System

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The MAX161 and MX7581 are CMOS single-chip 8-bit, 8-channel data acquisition systems (DAS). Each chip includes an 8-bit A/D converter, 8-channel multiplexer, 8 x 8 dual port RAM with contention logic, and microprocessor compatible I/O logic. When combined with a voltage reference, a complete data acquisition system is produced that interfaces with the majority of microprocessors.

Conversions take place on a continuous, channel sequencing basis using a microprocessor clock or control signal. Data is stored automatically in dual port RAM so that any channel can be read at any time under microprocessor control.

The MAX161 is an enhanced, pin-compatible version of the MX7581. Improvements include faster conversion and interface timing, lower zero error and drift, reduced power dissipation, and availability in military temperature grades. All devices are available in 28 pin DIP and Small Outiline (SO) packages.
MAX161, MX7581: Pin Configuration MAX161, MX7581: Pin Configuration Enlarge+

Key Features

  • Fast Conversion Time: 20μsec (MAX161)
  • No Missing Codes Over Temperature
  • On Chip 8x 8 Dual Port RAM
  • Interfaces Directly To Z80/8085/6800
  • Ratiometric Capability
  • Interleaved DMA Operation


  • Automatic Test Equipment
  • Data Loggers
  • Digital Signal Processing
  • Process Control
  • Robotics

See parametric specs for Precision ADCs (< 5Msps) (437)

Part NumberResolution
Input Chan.Conv. Rate
ADC ArchitectureData BusDiff/S.E. InputExternal VREF
External VREF
Unipolar VIN
ADCmaxminmaxmaxSee Notes
MAX161 8850SARµP/8S.E. Only-5-15-5
SOIC (W)/28
$16.03 @1k
MX7581 15
SOIC (W)/28
$13.94 @1k

Pricing 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 and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Request Reliability Report for: MAX161 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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