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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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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 ADC Resolution (Bits) Input Channels Conv. Rate (ksps) Max. Conv. Time (µs) Data Bus (Bits) Ref. (V) Input Range (V) Diff. In Supply Voltage (V) Typ. Supply Current (mA) Typ. Power (mW) Standby Mode Package Price**
    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   -  $9.25 @ 1k
    See All Precision ADCs (< 5Msps) (375)
    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.

    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

    Evaluation Kits
    none

    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: 1-48 of 48

    MAX127A Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX127ACNG+  
    		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
    MAX127ACNG    
    		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
    MAX127AENG+  
    		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
    MAX127AENG    
    		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
    MAX127ACAI+  
    		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    
    		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    
    		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    
    		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
    MAX127AEAI-T    
    		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    
    		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    
    		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+  
    		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
    MAX127B Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX127BCNG    
    		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+  
    		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    
    		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+  
    		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+T    
    		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+  
    		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    
    		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    
    		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
    MAX127BEAI+T    
    		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+  
    		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    
    		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    
    		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
    MAX128A Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX128ACNG+  
    		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
    MAX128ACNG    
    		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
    MAX128AENG+    
    		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
    MAX128AENG    
    		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
    MAX128ACAI+  
    		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    
    		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    
    		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    
    		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
    MAX128AEAI    
    		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    
    		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    
    		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+  
    		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
    MAX128B Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX128BCNG    
    		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+  
    		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+  
    		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
    MAX128BENG    
    		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
    MAX128BCAI+T    
    		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+  
    		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    
    		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    
    		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
    MAX128BEAI    
    		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+  
    		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    
    		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    
    		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

    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

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


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