AD7859 ADC IC Chip

AD7859(3 V to 5 V Single Supply, 200 kSPS,8-Channel, 12-Bit Sampling ADC)

Introduction

The AD7859/AD7859L are high speed, low power, 8-channel,12-bit ADCs which operate from a single 3V or 5V power supply, the AD7859 being optimized for speed and the AD7859L for low power. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature and have a number of power-down options for low power applications.

The AD7859 is capable of 200 kHz throughput rate while the AD7859L is capable of 100 kHz throughput rate. The input track- and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7859 and AD7859L input voltage range is 0 to VREF (unipolar) and -VEF/2 to +VREF/2 about VREF/2 (bipolar) with both straight binary and 2s complement output coding respectively. Input signal range is to the supply and the part is capable of converting full-power signals to 100 kHz.

CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 μW in power-down mode.The part is available in 44-pin, plastic quad flatpack package(PQFP) and plastic lead chip carrier (PLCC).

Feature

• Specified for Vpp of 3V to 5.5 V
  AD7859——200 kSPS; AD7859L——100 kSPS
• System and Self-Calibration
• Low Power
• Normal Operation
  – AD7859: 15 mW (Vpp= 3 V)
  – AD7859L: 5.5 mW (Vpp= 3 V)
• Using Automatic Power-Down After Conversion (25 μW)
  – AD7859: 1.3 mW (Vpp= 3 V 10 kSPS)
  – AD7859L: 650 μW (Vpp= 3 V 10 kSPS)
• Flexible Parallel Interface:16-Bit Parallel/8-Bit Parallel
• 44-Pin PQFP and PLCC Packages

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