/
/
/
Data Converters 
/
Analog-to-Digital Converters
/
Top ![]()
MAX1271A, MAX1271B
Multirange, +5V, 8-Channel, Serial 12-Bit ADCs
12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs
Maxim Confidential 
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
Parametric specs for Precision ADCs (< 5Msps)
| Resolution (bits) (ADC) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 110 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | S.E. Only |
| Internal VREF (V) (nominal) | 4.096 |
| External VREF (V) (min) | 2.4 |
| External VREF (V) (max) | 4.18 |
| Unipolar VIN (V) (max) | 4.096 |
| Bipolar VIN (±V) (max) | 2.048 |
| INL (±LSB) | 1 |
| Package/Pins | PDIP/24 SSOP/28 |
| Budgetary Price (See Notes) | 12.15 |
View More
Simplified Block Diagram
Technical Docs
| Data Sheet | Multirange, +5V, 8-Channel, Serial 12-Bit ADCs | Mar 02, 2005 |
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) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 110 |
| Data Bus | SPI |
| ADC Architecture | SAR |
| Diff/S.E. Input | S.E. Only |
| Internal VREF (V) (nominal) | 4.096 |
| External VREF (V) (min) | 2.4 |
| External VREF (V) (max) | 4.18 |
| Unipolar VIN (V) (max) | 4.096 |
| Bipolar VIN (±V) (max) | 2.048 |
| INL (±LSB) | 1 |
| Package/Pins | PDIP/24 SSOP/28 |
| Budgetary Price (See Notes) | 12.15 |
Key Features
- 12-Bit Resolution, 1/2LSB Linearity
- +5V Single-Supply Operation
- SPI/QSPI and MICROWIRE-Compatible 3-Wire Interface
- Four Software-Selectable Input Ranges
- MAX1270: 0 to +10V, 0 to +5V, ±10V, ±5V
- MAX1271: 0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2
- Eight Analog Input Channels
- 110ksps Sampling Rate
- ±16.5V Overvoltage-Tolerant Input Multiplexer
- Internal 4.096V or External Reference
- Two Power-Down Modes
- Internal or External Clock
- 24-Pin Narrow DIP or 28-Pin SSOP Packages
Applications/Uses
- Automatic Testing
- Battery-Powered Instruments
- Data Acquisition Systems
- Industrial Control Systems
- Medical Instruments
- Robotics
Description
The MAX1270/MAX1271 are multirange, 12-bit data-acquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that may span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX1270; ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 for the MAX1271. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4-20mA, ±12V, and ±15V powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, software-selectable internal/external clock, 110ksps throughput rate, and internal 4.096V or external reference operation.
The MAX1270/MAX1271 serial interface directly connects to SPI/QSPI and MICROWIRE devices without external logic.
A hardware shutdown input (SHDN-bar) and two software-programmable power-down modes, standby (STBYPD) or full power-down (FULLPD), are provided for low-current shutdown between conversions. In standby mode, the reference buffer remains active, eliminating start-up delays.
The MAX1270/MAX1271 are available in 24-pin narrow DIP or space-saving 28-pin SSOP packages.
The MAX1270/MAX1271 serial interface directly connects to SPI/QSPI and MICROWIRE devices without external logic.
A hardware shutdown input (SHDN-bar) and two software-programmable power-down modes, standby (STBYPD) or full power-down (FULLPD), are provided for low-current shutdown between conversions. In standby mode, the reference buffer remains active, eliminating start-up delays.
The MAX1270/MAX1271 are available in 24-pin narrow DIP or space-saving 28-pin SSOP packages.
Simplified Block Diagram
MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit
Technical Docs
| Data Sheet | Multirange, +5V, 8-Channel, Serial 12-Bit ADCs | Mar 02, 2005 |
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 .
Request a Quote