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Maxim > Products > [Analog-to-Digital Converters] 
MAX148, MAX149
+2.7V to +5.25V Low-Power 8-Channel Serial 10-Bit ADCs


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Data Sheet
FULL DATA SHEET (PDF, 1.9MB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX148/MAX149 10-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. They operate from a single +2.7V to +5.25V supply, and sample to 133ksps. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/QSPI™ and MICROWIRE™ devices without external logic. A serial-strobe output allows direct connection to TMS320-family digital signal processors. The MAX148/MAX149 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX149 has an internal 2.5V reference, while the MAX148 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired active-low SHDN pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX148/MAX149, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.

The MAX148/MAX149 are available in a 20-pin DIP and a 20-pin SSOP.

For 4-channel versions of these devices, see the MAX1248/MAX1249 data sheet.

Key Features   Applications/Uses
  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single-Supply Operation: +2.7V to +5.25V
  • Internal 2.5V Reference (MAX149)
  • Low Power:
    • 1.2mA (133ksps, 3V Supply)
    • 54µA (1ksps, 3V Supply)
    • 1µA (Power-Down Mode)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin DIP/SSOP Packages

 
  		• Battery-Powered Instruments
  		• 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) Input Range (V) Diff. In Supply Voltage (V) Typ. Supply Current (mA) Typ. Power (mW) Standby Mode Package Price**
    MAX148  10 8 133 7.5 Serial Ext.  -  Yes 3
    3.3
    5     		0.8 2.4 Yes CDIP(N)/20
    PDIP(N)/20
    SSOP/20     		$3.10 @ 1k
    MAX149  Int.+2.5 ±5
    2.5     		3
    3.3     		1.2 3.6 $3.20 @ 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
    MAX148, MAX149: Typical Operating Circuit
    Typical Operating Circuit

    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: 1-53 of 53

    MAX148 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX148AMJP    
    		CDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J20-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BMJP    
    		CDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J20-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BC/D    


    Land Pattern: Not Available

    		See data sheet
    MAX148BCPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BCPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148ACPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148ACPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148AEPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148AEPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148BEPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148BEPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148ACAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148ACAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148ACAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BCAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148ACAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BCAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BCAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BCAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148BEAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148AEAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148AEAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148BEAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX148AEAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148AEAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BEAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX148BEAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX149AMJP    
    		CDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J20-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BMJP    
    		CDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0045 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: J20-2*
    		-55°C to +125°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149ACPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BCPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149ACPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BCPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BEPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BEPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149AEPP    
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149AEPP+  
    		PDIP(N);20 pin;219 mm²
    Outline Drawing: 21-0043 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P20+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149ACAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149ACAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BCAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BCAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BCAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BCAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149ACAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149ACAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BEAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149AEAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BEAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149BEAP+  
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149BEAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149AEAP+T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX149AEAP    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX149AEAP-T    
    		SSOP;20 pin;58 mm²
    Outline Drawing: 21-0056 (PDF)
    Land Pattern: 90-0094 (PDF)
    Use pkgcode/variation: A20-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis

    Related Products
    MAX146, MAX147 +2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs
    MAX1248, MAX1249 +2.7V to +5.25V, Low-Power, 4-Channel, Serial, 10-Bit ADCs in QSOP-16

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    Document Ref.: 19-0464; Rev 3; 2009-06-08
    This page last modified: 2009-06-08


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