描述The ADS8284 is a high-performance analog system-on-chip (SoC) device with an 18-bit, 1-MSPS A/D converter, 4-V internal reference, an on-chip ADC driver (OPA), and a 4-channel differential multiplexer. The channel count of the multiplexer and auto/manual scan modes of the device are user selectable. The ADC driver is designed to leverage the very high noise performance of the differential ADC at optimum power usage levels.The ADS8284 outputs a buffered reference signal for level shifting of a ±4-V bipolar signal with an external resistance divider. A Vref/2 output signal is available to set the common-mode of a signal conditioning circuit. The device also includes an 18-/16-/8-bit parallel interface.The ADS8284 is available in a 9 mm × 9 mm, 64-pin QFN package and is characterized from -40°C to 85°C. For all available packages, see the orderable addendum at the end of the data sheet.特性1.0-MHz Sample Rate, Zero Latency at Full Speed 18-Bit Resolution Supports Pseudo-Bipolar Differential Input Range: -4 V to +4 V with 2-V Common-Mode Built-In Four Channel, Differential Ended Multiplexer; with Channel Count Selection and Auto/Manual Mode On-Board Differential ADC Driver (OPA) Buffered Reference Output to Level Shift Bipolar ±4-V Input with External Resistance DividerReference/2 Output to Set Common-Mode for External Signal Conditioner 18-/16-/8-Bit Parallel Interface SNR: 98.4dB Typ at 2-kHz I/PTHD: –119dB Typ at 2-kHz I/P Power Dissipation: 331.25 mW at 1 MSPS Including ADC Driver Internal ReferenceInternal Reference Buffer 64-Pin QFN Package