描述The ADS8484 is an 18-bit, 1.25-MSPS A/C converter with an internal 4.096-V reference and a pseudo-bipolar, fully differential input. The device includes a 18-bit capacitor-based SAR A/D converter with inherent sample and hold. The ADS8484 offers a full 18-bit interface, a 16-bit option where data is read using two read cycles, or an 8-bit bus option using three read cycles. The ADS8484 is available in a 48-lead 7x7 QFN package and is characterized over the industrial -40°C to 85°C temperature range.特性1.25-MHz Sample Rate±1.5 LSB Typ, ±2.5 LSB Max INL+0.8/-0.6 LSB Typ, +1.5/-1 LSB Max DNL18-Bit NMC Ensured Over Temperature±0.5-mV Offset ErrorTBD-PPM/°C Offset Error Drift±0.1 %FSR Gain Error±TBD-PPM/°C Gain Error Drift99dB SNR, -117db THD, 120dB SFDRZero LatencyLow Power: 235 mW Typ at 1.25 MSPSPseudo-Bipolar Fully Differential Input Range: Vref to -VrefOnboard Reference with TBD PPM/°C DriftOnboard Reference BufferHigh-Speed Parallel InterfaceWide Digital Supply 2.7 V to5.25 V8-/16-/18-Bit Bus Transfer48-Pin 7x7 QFN PackageAPPLICATIONSMedical InstrumentsOptical NetworkingTransducer InterfaceHigh Accuracy Data Acquisition SystemsMagnetometers