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ADS8881 데이터시트 - Texas Instruments

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ADS8881 18-Bit, 1-MSPS, Serial Interface, microPower, Miniature, True-Differential Input, SAR Analog-to-Digital Converter TI
Texas Instruments TI
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Description
The ADS8881 is an 18-bit, 1-MSPS, true-differential input, analog-to-digital converter (ADC). The device operates with a 2.5-V to 5-V external reference, offering a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD).
The device offers an SPI-compatible serial interface that also supports daisy-chain operation for cascading multiple devices. An optional busy indicator bit makes synchronizing with the digital host easy.
The device supports unipolar, true-differential analog input signals with a differential input swing of –VREF to VREF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to VREF (when both inputs are within the operating input range of –0.1 V to VREF + 0.1 V).
Device operation is optimized for very low-power operation. Power consumption directly scales with speed. This feature makes the ADS8881 excellent for lower-speed applications.

Features
• Sample Rate: 1 MHz
• No Latency Output
• Unipolar, True-Differential Input Range:
   –VREF to +VREF
• Wide Common-Mode Voltage Range:
   0 V to VREF with 90-dB CMRR (min)
• SPI™-Compatible Serial Interface with
   Daisy-Chain Option
• Excellent AC and DC Performance:
   – ADS8881C:
      INL: ±1 LSB (typ), ±2.0 LSB (max)
      DNL: ±1.0 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
   – ADS8881I:
      INL: ±1.5 LSB (typ), ±3.0 LSB (max)
      DNL: +1.5 and –1 LSB (max), 18-Bit NMC
      SNR: 100 dB, THD: –115 dB
• Wide Operating Range:
   – AVDD: 2.7 V to 3.6 V
   – DVDD: 2.7 V to 3.6 V
      (Independent of AVDD)
   – REF: 2.5 V to 5 V (Independent of AVDD)
   – Operating Temperature:
      ADS8881C : 0°C to +70°C
      ADS8881I : –40°C to +85°C
• Low-Power Dissipation:
   – 5.5 mW at 1 MSPS
   – 0.55 mW at 100 kSPS
   – 55 µW at 10 kSPS
• Power-Down Current (AVDD): 50 nA
• Full-Scale Step Settling to 18 Bits: 290 ns
• Packages: MSOP-10 and VSON-10

Applications
• Automatic Test Equipment (ATE)
• Instrumentation and Process Controls
• Precision Medical Equipment
• Low-Power, Battery-Operated Instruments

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