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MAX1495
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MAX1495

  • 所属类别：转换器
  • 产品名称：3.5和4.5位，单芯片LCD驱动器的ADC
  • 厂商：MAXIM
  • 生产批号：2011+
  • 封装：32-LQFP
  • 库存状态：有库存
  • 库存量：7000
  • 最低订购量：1
  • 详细资料：点击查找MAX1495的pdf资料
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  • Product Introduction

MAX1495

ADCs for 3.5 and 4.5-bit, single-chip LCD drivers

description

MAX1491/MAX1493/MAX1495 low-power, 3.5- and 4.5-bit, integrated liquid crystal display (LCD) drivers for analog-to-digital converter (ADC) operation from a single 2.7V to 5.25V supply. They include in-house references, high-precision on-chip oscillators, and triplexed LCD drivers. The internal charge pump generates a negative power supply, which is required by an integrated input buffer for single-supply operation. The ADC is configured to ± 2V or ±200mV input range and output its conversion results to an LCD. MAX1491 is a 3.5-bit (±1999 count) device and MAX1493/MAX1495 is a 4.5-bit (±19,999 count) device.

In MAX1491/MAX1493/MAX1495, there is no need for external high-precision integrated or auto-zeroing capacitors, crystal oscillators, charge pumps, or other circuitry required for dual-slope ADCs (commonly used in panel instrumentation circuits). The devices also feature on-chip buffers, and the differential signal and reference inputs allow for direct interfacing with high-impedance sources. Additionally, the MAX1491/MAX1493/MAX1495 uses continuous internal offset calibration and provides > 100 dB 50Hz and 60Hz supply noise rejection. MAX1493/MAX1495 perform enhanced electrical offset calibration. MAX1495 also perform calibration needs enhancement. Other features include data hold, peak hold, and a user-programmable low battery monitor.

MAX1493/MAX1495 in a 32-pin 7mm x 7mm TQFP package, 28-pin SSOP and 28-pin DIP package, MAX1491. All devices in this family operate over the 0°C to +70°C commercial temperature range.

Key features:

  • High resolution
    • MAX1495: 4.5-bit (± 19,999 count)
    • MAX1493: 4.5-bit (± 19,999 count)
    • MAX1491: 3.5 bits (±1999 count)
  • Sigma-ΔADC architecture
    • There are no integrated capacitors
    • There is no auto-zeroing capacitor
    • > 100dB with simultaneous 50Hz and 60Hz rejection
  • Operates from a single 2.7V or 5.25V supply
  • Selectable input range ± 200mV or ±2V
  • Selectable voltage reference: internal 2.048V or external
  • Internal high-precision oscillator without external components
  • Automatic offset calibration
  • Low power consumption: Operating current up to 980μA
  • Small 32-pin package in 7mm x 7mm TQFP (4.5-bit), 28-pin SSOP package (3.5-bit), 28-pin DIP package (3.5-bit)
  • Triplexed LCD drivers
  • Evaluation boards available (order MAX1494EVKIT)

Applications/Uses:

  • Digital multimeter
     
  • Digital panel table
     
  • Digital voltmeter
     
  • Handheld instrumentation

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