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Maxim > Products > [Analog-to-Digital Converters] 
MAX127, MAX127A, MAX127B, MAX128, MAX128A, MAX128B
Multirange, +5V, 12-Bit DAS with 2-Wire Serial Interface

First 2-Wire 12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 136kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX127/MAX128 are multirange, 12-bit data acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX127; and ±VREF, ±VREF/2, 0 to +VREF, 0 to +VREF/2 for the MAX128. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA, ±12V, and ±15V-powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, an 8ksps throughput rate, and the option of an internal 4.096V or external reference.

The MAX127/MAX128 feature a 2-wire, I²C*-compatible serial interface that allows communication among multiple devices using SDA and SCL lines.

A hardware shutdown input (active-low SHDN) and two software-programmable power-down modes (standby and full power-down) are provided for low-current shutdown between conversions. In standby mode, the reference-buffer remains active, eliminating start-up delays.

The MAX127/MAX128 are available in 24-pin DIP or space-saving 28-pin SSOP packages.

Key Features   Applications/Uses
  • 12-Bit Resolution, 1/2 LSB Linearity
  • +5V Single-Supply Operation
  • I²C-Compatible, 2-Wire Serial Interface
  • Four Software-Selectable Input Ranges
    • MAX127: 0 to +10V, 0 to +5V, ±10V, ±5V
    • MAX128: 0 to +VREF, 0 to +VREF/2, ±VREF, ±VREF/2
  • 8 Analog Input Channels
  • 8ksps Sampling Rate
  • ±16.5V Overvoltage-Tolerant Input Multiplexer
  • Internal 4.096V or External Reference
  • Two Power-Down Modes
  • 24-Pin Narrow DIP or 28-Pin SSOP Packages

 
  		• Battery-Powered Applications
  		• Data Acquisition
  		• Industrial Control Systems
  		• Robotics

    Key Specifications:  Precision ADCs (< 5Msps)
    Part Number Resolution
    (bits)    		 Input Chan. Conv. Rate
    (ksps)    		 Conv. Time
    (µs)    		 Data Bus
    (bits)    		 Ref.
    (V)    		 VIN
    (V)    		 Diff. Inputs VSUPPLY
    (V)    		 ICC
    (mA)    		 Power
    (mW)    		 Standby Mode Package/Pins Price
    ADC max typ typ See Notes
    MAX127  12 8 8 10 I2C Compatible
    Ext.
    Int.+4.096
    ±5
    ±10
    5
    10
    		 No 5 6 30 Yes
    PDIP(N)/24
    SSOP/28
    		 $9.25 @1k
    MAX128  -
    PDIP(N)/24
    SSOP/28
    		 $9.25 @1k
    See All Precision ADCs (< 5Msps) (377)

    Diagram
    MAX127, MAX127A, MAX127B, MAX128, MAX128A, MAX128B: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 270: Analog-Signal Data Acquisition in Industrial Automation Systems - MAX127, MAX128
  		• Application Note 3297: Remote Monitoring System Sends E-mail via SMS - MAX127

    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: 1-48 of 48

    MAX127A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX127ACNG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127ACNG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127AENG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127AENG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127ACAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127ACAI-T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127ACAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127ACAI+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX127AEAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX127AEAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127AEAI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX127B Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX127BCNG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127BCNG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127BENG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127BENG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127BCAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127BCAI-T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127BCAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127BCAI+T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127BEAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX127BEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX127BEAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX127BEAI+T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128A Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX128ACNG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128ACNG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128AENG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128AENG+    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128ACAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128ACAI-T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX128ACAI+    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128ACAI+T    
    		Active

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    MAX128AEAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128AEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX128AEAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128AEAI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX128B Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX128BCNG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128BCNG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128BENG    
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24-8*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128BENG+  
    		Active PDIP(N);24 pin;265 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: N24+8*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128BCAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128BCAI-T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128BCAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128BCAI+T    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128BEAI    
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28-3*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX128BEAI-T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet
    MAX128BEAI+  
    		Active SSOP;28 pin;82 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0095 (PDF)
    Use pkgcode/variation: A28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX128BEAI+T    
    		Active

    Land Pattern: Not Available

    		-40°C to +85°C See data sheet

    Notes and Comments
    • Multi-range, 12 bit, 2-wire interface

    Related Products
    MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B Multirange, +5V, 8-Channel, Serial 12-Bit ADCs

    More Like This: View Product Families for Similar Products

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    Document Ref.: 19-4773; Rev 0; 1998-07-01
    This page last modified: 2007-07-20


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