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+2.7V、低功耗、8通道、串行12位ADC

产品详情

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

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
Parametric specs for Precision ADCs (< 5Msps)
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) 5.25
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)
$2.95 @1k
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简化框图

MAX146、MAX147:典型工作电路 MAX146、MAX147:典型工作电路 Zoom icon

技术文档

设计与质量

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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.

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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.

查看详情

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

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支持和培训

在Maxim的知识库中搜索您所需的答案。

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参量

Parametric specs for Precision ADCs (<u><</u> 5Msps)
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) 5.25
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)
$2.95 @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 MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

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.

简化框图

MAX146、MAX147:典型工作电路 MAX146、MAX147:典型工作电路 Zoom icon

技术文档

支持和培训

在Maxim的知识库中搜索您所需的答案。

过滤搜索

Maxim专业的应用工程师团队也可以为您解答技术问题,请 访问Maxim的 支持中心