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The 4-wire serial interface connects directly to SPI/ QSPI and MICROWIRE devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.
The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.
These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.
For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.
主要特征
- 8-Channel Single-Ended or 4-Channel Differential Inputs
- Single-Supply Operation
- +2.7V to +3.6V (MAX146)
- +2.7V to +5.25V (MAX147)
- Internal 2.5V Reference (MAX146)
- Low Power
- 1.2mA (133ksps, 3V supply)
- 54µA (1ksps, 3V supply)
- 1µA (power-down mode)
- SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
- Software-Configurable Unipolar or Bipolar Inputs
- 20-Pin DIP/SSOP Packages
应用/用途
- 电池供电应用
- 数据采集
- 医疗仪器
- 笔输入量化器
- 便携式数据记录
- 过程控制
| Resolution (bits) (ADC) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 133 |
| 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 | PDIP/20 SSOP/20 |
| Budgetary Price (See Notes) | $9.49 @1k |
技术文档
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描述
The MAX147 evaluation system (EV system) is a complete, low-cost, 8-channel data-acquisition system consisting of a MAX147 evaluation kit (EV kit) and a Maxim 68HC16 or 80C32 microcontroller (µC) module. IBM® PC-compatible software provides a handy user interface to exercise the MAX147's features. Source code is provided.
Order the EV system for comprehensive evaluation of the MAX147 using a personal computer. Order the EV kit if the 68HC16 or 80C32 µC module was purchased previously with another Maxim EV system, or for custom use in other µC-based systems.
The MAX147 EV kit evaluates both the MAX147 and the MAX146. To evaluate the MAX146, order a free sample of the MAX146BCPP along with the MAX147 EV kit.
特征
- Proven PC Board Layout
- Complete Evaluation System
- Convenient Test Points Provided On-Board
- Data-Logging Software
- Source Code Provided
- Fully Assembled and Tested
描述
The MAX147 evaluation system (EV system) is a complete, low-cost, 8-channel data-acquisition system consisting of a MAX147 evaluation kit (EV kit) and a Maxim 68HC16 or 80C32 microcontroller (µC) module. IBM® PC-compatible software provides a handy user interface to exercise the MAX147's features. Source code is provided.
Order the EV system for comprehensive evaluation of the MAX147 using a personal computer. Order the EV kit if the 68HC16 or 80C32 µC module was purchased previously with another Maxim EV system, or for custom use in other µC-based systems.
The MAX147 EV kit evaluates both the MAX147 and the MAX146. To evaluate the MAX146, order a free sample of the MAX146BCPP along with the MAX147 EV kit.
特征
- Proven PC Board Layout
- Complete Evaluation System
- Convenient Test Points Provided On-Board
- Data-Logging Software
- Source Code Provided
- Fully Assembled and Tested
参量
| Resolution (bits) (ADC) | 12 |
| # Input Channels | 8 |
| Conv. Rate (ksps) (max) | 133 |
| 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 | PDIP/20 SSOP/20 |
| Budgetary Price (See Notes) | $9.49 @1k |
主要特征
- 8-Channel Single-Ended or 4-Channel Differential Inputs
- Single-Supply Operation
- +2.7V to +3.6V (MAX146)
- +2.7V to +5.25V (MAX147)
- Internal 2.5V Reference (MAX146)
- Low Power
- 1.2mA (133ksps, 3V supply)
- 54µA (1ksps, 3V supply)
- 1µA (power-down mode)
- SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
- Software-Configurable Unipolar or Bipolar Inputs
- 20-Pin DIP/SSOP Packages
应用/用途
- 电池供电应用
- 数据采集
- 医疗仪器
- 笔输入量化器
- 便携式数据记录
- 过程控制
描述
The 4-wire serial interface connects directly to SPI/ QSPI and MICROWIRE devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.
The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.
These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.
The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.
For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.
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