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Data Converters 
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Analog-to-Digital Converters
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MAX1111
+2.7V, Low-Power, Multichannel, Serial, 8-Bit ADCs
Lowest-Power 8-Bit 4/8-Channel ADCs Have Internal Reference
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Key Features
Applications/Uses
Parametric specs for Precision ADCs (< 5Msps)
| Resolution (bits) (ADC) | 8 |
| # Input Channels | 4 |
| Conv. Rate (ksps) (max) | 50 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 2.048 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 5.5 |
| Unipolar VIN (V) (max) | 2.048 |
| Bipolar VIN (±V) (max) | 1.024 |
| INL (±LSB) | 0.2 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 2.7 |
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Parameters
Parametric specs for Precision ADCs (<u><</u> 5Msps)
| Resolution (bits) (ADC) | 8 |
| # Input Channels | 4 |
| Conv. Rate (ksps) (max) | 50 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 2.048 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 5.5 |
| Unipolar VIN (V) (max) | 2.048 |
| Bipolar VIN (±V) (max) | 1.024 |
| INL (±LSB) | 0.2 |
| Package/Pins | QSOP/16 |
| Budgetary Price (See Notes) | 2.7 |
Key Features
- 2.7V to 5.5V Single Supply
- Low Power
- 85µA at 50ksps
- 6µA at 1ksps
- 8-Channel Single-Ended or 4-Channel Differential Inputs (MAX1110)
- 4-Channel Single-Ended or 2-Channel Differential Inputs (MAX1111)
- Internal Track/Hold; 50kHz Sampling Rate
- Internal 2.048V Reference
- SPI/QSPI/MICROWIRE-Compatible Serial Interface
- Software-Configurable Unipolar or Bipolar Inputs
- Total Unadjusted Error
- ±1 LSB (max)
- ±0.3 LSB (typ)
Applications/Uses
- 4mA to 20mA-Powered Remote Data-Acquisition Systems
- Hand-Held Measurement Devices
- Medical Instruments
- Portable Data Logging
- Solar-Powered Remote Systems
- System Diagnostics
Description
The MAX1110/MAX1111 low-power, 8-bit, 8-channel analog-to-digital converters (ADCs) feature an internal track/hold, voltage reference, clock, and serial interface. They operate from a single 2.7V to 5.5V supply and consume only 85µA while sampling at rates up to 50ksps. The MAX1110's 8 analog inputs and the MAX1111's 4 analog inputs are software-configurable, allowing unipolar/bipolar and single-ended/differential operation.
Successive-approximation conversions are performed using either the internal clock or an external serial-interface clock. The full-scale analog input range is determined by the 2.048V internal reference, or by an externally applied reference ranging from 1V to VDD. The 4-wire serial interface is compatible with the SPI™, QSPI™, and MICROWIRE™ serial-interface standards. A serial-strobe output provides the end-of-conversion signal for interrupt-driven processors.
The MAX1110/MAX1111 have a software-programmable, 2µA automatic power-down mode to minimize power consumption. Using power-down, the supply current is reduced to 6µA at 1ksps, and only 52µA at 10ksps. Power-down can also be controlled using the active-low SHDN input pin. Accessing the serial interface automatically powers up the device.
The MAX1110 is available in a 20-pin SSOP package. The MAX1111 is available in a small 16-pin QSOP package.
Successive-approximation conversions are performed using either the internal clock or an external serial-interface clock. The full-scale analog input range is determined by the 2.048V internal reference, or by an externally applied reference ranging from 1V to VDD. The 4-wire serial interface is compatible with the SPI™, QSPI™, and MICROWIRE™ serial-interface standards. A serial-strobe output provides the end-of-conversion signal for interrupt-driven processors.
The MAX1110/MAX1111 have a software-programmable, 2µA automatic power-down mode to minimize power consumption. Using power-down, the supply current is reduced to 6µA at 1ksps, and only 52µA at 10ksps. Power-down can also be controlled using the active-low SHDN input pin. Accessing the serial interface automatically powers up the device.
The MAX1110 is available in a 20-pin SSOP package. The MAX1111 is available in a small 16-pin QSOP package.
Technical Docs
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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