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Data Converters 
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Analog-to-Digital Converters
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MAX1281B
400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference
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Key Features
Applications/Uses
Parametric specs for Precision ADCs (< 5Msps)
| Resolution (bits) (ADC) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 300 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 2.5 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 3.6 |
| Unipolar VIN (V) (max) | 2.5 |
| Bipolar VIN (±V) (max) | 1.25 |
| INL (±LSB) | 1 |
| Package/Pins | TSSOP/20 |
| Budgetary Price (See Notes) | 9.75 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference | Nov 30, 2010 |
Support & Training
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Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Parameters
Parametric specs for Precision ADCs (<u><</u> 5Msps)
| Resolution (bits) (ADC) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 300 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 2.5 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 3.6 |
| Unipolar VIN (V) (max) | 2.5 |
| Bipolar VIN (±V) (max) | 1.25 |
| INL (±LSB) | 1 |
| Package/Pins | TSSOP/20 |
| Budgetary Price (See Notes) | 9.75 |
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
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).
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).
Technical Docs
| Data Sheet | 400ksps/300ksps, Single-Supply, Low-Power, 8-Channel, Serial 12-Bit ADCs with Internal Reference | Nov 30, 2010 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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