描述 Description

By using a half-flash conversion technique, the 8-bit ADC0820-N CMOS A/D offers a 1.5 μs conversion time and dissipates only 75 mW of power. The half-flash technique consists of 32 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC.The input to the ADC0820-N is tracked and held by the input sampling circuitry eliminating the need for an external sample-and-hold for signals moving at less than 100 mV/μs.For ease of interface to microprocessors, the ADC0820-N has been designed to appear as a memory location or I/O port without the need for external interfacing logic.

特性 Features

? Built-In Track-and-Hold Function
? No Missing Codes
? No External Clocking
? Single Supply—5 VDC
? Easy Interface to All Microprocessors, or Operates Stand-Alone
? Latched TRI-STATE Output
? Logic Inputs and Outputs Meet Both MOS and T2L Voltage Level Specifications
? Operates Ratiometrically or with any Reference Value Equal to or Less than VCC
? 0V to 5V Analog Input Voltage Range with Single 5V Supply
? No Zero or Full-Scale Adjust Required
? Overflow Output Available for Cascading
? 0.3 in. Standard Width 20-Pin PDIP
? 20-Pin PLCC
? 20-Pin SOIC
Key Specifications
? Resolution: 8 Bits
? Conversion Time
? 2.5 μs Max (RD Mode)
? 1.5 μs Max (WR-RD Mode)

? Low Power: 75 mW Max
? Total Unadjusted Error: ±? LSB and ± 1 LSB