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Data Converters 
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Analog-to-Digital Converters
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MAX1109
Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs
Lowest-Power 8-Bit Serial 2-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 | 2 |
| Conv. Rate (ksps) (max) | 50 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 4.096 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 5.5 |
| Unipolar VIN (V) (max) | 4.096 |
| Bipolar VIN (±V) (max) | 2.048 |
| INL (±LSB) | 0.15 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 2.63 |
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Simplified Block Diagram
Technical Docs
| Data Sheet | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs | Jun 12, 2003 | |
| App Note | Saving Energy: Little Things Mean a Lot |
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 .
Parameters
Parametric specs for Precision ADCs (<u><</u> 5Msps)
| Resolution (bits) (ADC) | 8 |
| # Input Channels | 2 |
| Conv. Rate (ksps) (max) | 50 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | Both |
| Internal VREF (V) (nominal) | 4.096 |
| External VREF (V) (min) | 1 |
| External VREF (V) (max) | 5.5 |
| Unipolar VIN (V) (max) | 4.096 |
| Bipolar VIN (±V) (max) | 2.048 |
| INL (±LSB) | 0.15 |
| Package/Pins | UMAX/10 |
| Budgetary Price (See Notes) | 2.63 |
Key Features
- Single Supply:
- +2.7V to +3.6V (MAX1108)
- +4.5V to +5.5V (MAX1109)
- Low Power:
- 105µA at +3V and 50ksps
- 0.5µA in Power-Down Mode
- Software-Configurable Unipolar or Bipolar Inputs
- Input Voltage Range: 0 to VDD
- Internal Track/Hold
- Internal Reference:
- +2.048V (MAX1108)
- +4.096V (MAX1109)
- Reference Input Range: 1V to VDD
- SPI/QSPI/MICROWIRE-Compatible Serial Interface
- VDD Monitoring Mode
- Small 10-Pin µMAX Package
Applications/Uses
- 4mA- to 20mA-Powered Remote Systems
- Handheld Measurement Devices
- Medical Instruments
- Portable Data Logging
- Receive Signal Strength Indicators
- Solar-Powered Remote Systems
- System Diagnostics
Description
The MAX1108/MAX1109 low-power, 8-bit, dual-channel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H) voltage reference, clock, and serial interface. The MAX1108 is specified from +2.7V to +3.6V and consumes only 105µA. The MAX1109 is specified from +4.5V to +5.5V and consumes only 130µA. The analog inputs are software configurable, allowing unipolar/bipolar and single-ended/differential operation; battery monitoring capability is also included.
The full-scale analog input range is determined by the internal reference of +2.048V (MAX1108) or +4.096V (MAX1109), or by an externally applied reference ranging from 1V to VDD. The MAX1108/MAX1109 also feature a software power-down mode that reduces power consumption to 0.5µA when the device is not in use. The 4-wire serial interface directly connects to SPI, QSPI, and MICROWIRE devices without external logic. Conversions up to 50ksps are performed using either the internal clock or an external serial-interface clock.
The MAX1108 and MAX1109 are available in a 10-pin µMAX package with a footprint that is just 20% of an 8-pin plastic DIP.
The full-scale analog input range is determined by the internal reference of +2.048V (MAX1108) or +4.096V (MAX1109), or by an externally applied reference ranging from 1V to VDD. The MAX1108/MAX1109 also feature a software power-down mode that reduces power consumption to 0.5µA when the device is not in use. The 4-wire serial interface directly connects to SPI, QSPI, and MICROWIRE devices without external logic. Conversions up to 50ksps are performed using either the internal clock or an external serial-interface clock.
The MAX1108 and MAX1109 are available in a 10-pin µMAX package with a footprint that is just 20% of an 8-pin plastic DIP.
Technical Docs
| Data Sheet | Single-Supply, Low-Power, 2-Channel, Serial 8-Bit ADCs | Jun 12, 2003 | |
| App Note | Saving Energy: Little Things Mean a Lot |
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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