MAX1293:250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

Smallest, Low-Power, Parallel-Output 12-Bit ADCs

The MAX1291/MAX1293 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an on-chip clock, +2.5V internal reference, and a high-speed, byte-wide parallel interface. They operate with a single +3V analog supply and feature a VLOGIC pin that allows them to interface directly with a +1.8V to +5.5V digital supply. Power consumption is only 5.7mW (VDD = VLOGIC) at the maximum sampling rate of 250ksps. Two software-selectable power-down modes enable the MAX1291/MAX1293 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can cut supply current to under 10µA at reduced sampling rates. Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1291 has eight input channels and the MAX1293 has four input channels (four and two input channels, respectively, when in pseudo-differential mode). Excellent dynamic performance and low power, combined with ease of use and small package size, make these converters ideal for battery-powered and data-acquisition applications or for other circuits with demanding power consumption and space requirements. The MAX1291/MAX1293 tri-states active-low INT when active-low CS goes high. Refer to MAX1261/MAX1263 if tri-stating active-low INT is not desired. The MAX1291 is available in a 28-pin QSOP package, while the MAX1293 is available in a 24-pin QSOP. For pin-compatible +5V, 12-bit versions, refer to the MAX1290/MAX1292 data sheet.

Key Features
  • 12-Bit Resolution, ±0.5 LSB Linearity
  • +3V Single Operation
  • User-Adjustable Logic Level (+1.8V to +3.6V)
  • Internal +2.5V Reference
  • Software-Configurable, Analog Input Multiplexer
    • 8-Channel Single-Ended/4-Channel Pseudo-Differential (MAX1291)
    • 4-Channel Single-Ended/2-Channel Pseudo-Differential (MAX1293)
  • Software-Configurable, Unipolar/Bipolar Inputs
  • Low Power:
    • 1.9mA (250ksps)
    • 1.0mA (100ksps)
    • 400µA (10ksps)
    • 2µA (Shutdown)
  • Internal 3MHz Full-Power Bandwidth Track/Hold
  • Byte-Wide Parallel (8 + 4) Interface
  • Small Footprint:
    • 28-Pin QSOP (MAX1291)
    • 24-Pin QSOP (MAX1293)
MAX1291, MAX1293: Typical Operating Circuits
MAX1291, MAX1293: Typical Operating Circuits
Applications/Uses
  • Data Acquisition Systems
  • Data Logging
  • Energy Management
  • Industrial Controls Systems
  • Patient Monitoring
  • Touch Screens
DataSheet
titleDownload file
MAX1291-MAX1293 Data SheetMAX1291-MAX1293.pdf
Parametrics
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
MAX1291128250SARµP/8Both2.513.62.51.25-781QSOP/28$8.86 @1k
MAX12934QSOP/24$7.36 @1k
Quality and Environmental Data
Related Products
  • MAX1267:265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1261:250ksps, +3V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1268:420ksps, +5V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1262:400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX115:2x4-Channel, Simultaneous-Sampling 12-Bit ADCs
  • MAX1297:265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1295:265ksps, +3V, 6-/2-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1290:400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
  • MAX1292:400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1293ACEGNo Longer AvailableMAX1293ACEG+QSOP,;24 pin;54.2 mm²0°C to +70°CNo
MAX1293ACEG+ActiveQSOP,;24 pin;54.2 mm²0°C to +70°CLead Free
MAX1293ACEG+TActiveQSOP;24 pin0°C to +70°CSee data sheet
MAX1293ACEG-TNo Longer AvailableMAX1293ACEG+TQSOP;24 pin0°C to +70°CSee data sheet
MAX1293AEEGNo Longer AvailableMAX1293AEEG+QSOP,;24 pin;54.2 mm²-40°C to +85°CNo
MAX1293AEEG+ActiveQSOP,;24 pin;54.2 mm²-40°C to +85°CLead Free
MAX1293AEEG+TActiveQSOP;24 pin-40°C to +85°CSee data sheet
MAX1293AEEG-TNo Longer AvailableMAX1293AEEG+TQSOP;24 pin-40°C to +85°CSee data sheet
MAX1293BCEGNo Longer AvailableMAX1293BCEG+QSOP,;24 pin;54.2 mm²0°C to +70°CNo
MAX1293BCEG+ActiveQSOP,;24 pin;54.2 mm²0°C to +70°CLead Free
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX1293BCEG+TActiveQSOP;24 pin0°C to +70°CSee data sheet
MAX1293BCEG-TNo Longer AvailableMAX1293BCEG+TQSOP,;24 pin;54.2 mm²0°C to +70°CNo
MAX1293BEEGNo Longer AvailableMAX1293BEEG+QSOP,;24 pin;54.2 mm²-40°C to +85°CNo
MAX1293BEEG+ActiveQSOP,;24 pin;54.2 mm²-40°C to +85°CLead Free
MAX1293BEEG+TActiveQSOP,;24 pin;54.2 mm²-40°C to +85°CLead Free
MAX1293BEEG-TNo Longer AvailableMAX1293BEEG+TQSOP;24 pin-40°C to +85°CSee data sheet
MAX1291-MAX1293.pdf MAX1293
MAX1293.pdf MAX1293
MAX1291-MAX1293.pdf MAX1293