MAX1280B

400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference


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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).

MAX1280, MAX1280B, MAX1281, MAX1281B: Typical Operating Circuit MAX1280, MAX1280B, MAX1281, MAX1281B: Typical Operating Circuit Enlarge+

Key Features

  • 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

Applications/Uses

  • Battery-Powered Applications
  • Data Acquisition
  • Medical Instruments
  • Pen Digitizers
  • Portable Data Logging
  • Process Control
Part NumberResolution
(bits)
Input Chan.Conv. Rate
(ksps)
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
(V)
External VREF
(V)
External VREF
(V)
Unipolar VIN
(V)
Bipolar VIN
(±V)
THD
(dB)
INL
(±LSB)
Package/PinsBudgetary
Price
ADCmaxnominalminmaxmaxmaxSee Notes
MAX1280 128400SARSPIBoth2.515.52.51.25-811
TSSOP/20
$10.08 @1k
MAX1281 3003.6
TSSOP/20
$8.76 @1k
See All Precision ADCs (< 5Msps) (444)
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.


MAX1280EVC16: Evaluation Kit/Evaluation System for the MAX1280
MAX1280EVKIT: Evaluation Kit/Evaluation System for the MAX1280

Quality and Environmental Data

Request Reliability Report for: MAX1280B 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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Related Resources


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05/29/2020 - 05/31/2020, Detroit, MI
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