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3 1/2位ADC,带有电压基准、电荷泵和直接LED驱动器

工作在+2.5V至+7V单电源,可接受双极性输入

产品详情

主要特征

Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 2000
# Input Channels 1
Data Bus 7-Segment
Diff/S.E. Input Diff. Only
External VREF (V) (min) 0
External VREF (V) (max) 7
Bipolar VIN (±V) (max) 7
Package/Pins MQFP/44
PDIP/40
PLCC/44
Budgetary
Price (See Notes)
11.06
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参量

Parametric specs for Display-Oriented ADCs
Resolution (±Counts) 2000
# Input Channels 1
Data Bus 7-Segment
Diff/S.E. Input Diff. Only
External VREF (V) (min) 0
External VREF (V) (max) 7
Bipolar VIN (±V) (max) 7
Package/Pins MQFP/44
PDIP/40
PLCC/44
Budgetary
Price (See Notes)
11.06

主要特征

  • Single Supply +2.5V to +7.0V Operation
  • Measures Both Positive and Negative Input Voltages
  • Charge-Pump Voltage Inverter Generates a Negative Supply Voltage
  • Internal Bandgap Reference
  • On-Board Display Driver
  • Low Segment Current (MAX140)

应用/用途

  • +3V Powered DMMs
  • +5V Powered Panel Meters
  • Digital Thermometers
  • Instruments
  • Portable Monitors
  • Weigh Scales

描述

The MAX138/MAX139 are 3 ½ digit A/D converters (ADCs) with on-board LCD (MAX138) and LED (MAX139) display drivers. The MAX138/MAX139 also contain a charge-pump voltage inverter. The charge-pump inverter allows the MAX138/MAX139 to measure both positive and negative input voltages while operating from a single power-supply voltage from +2.5V to +7V. The operating circuits of the MAX138/MAX139 are similar to those of the ICL7136 and ICL7137 respectively, except the MAX138/MAX139 have an internal oscillator and an external charge-pump capacitor connected to pins 38 and 40.

MAX140 is a low segment-current version of the MAX139 intended for use with low-current LED displays.

简化框图

MAX138、MAX139、MAX140:典型工作电路 MAX138、MAX139、MAX140:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

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Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心