ADC0820-N - 8-Bit High Speed µP Compatible A/D Converter with Track/Hold Function

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.

• Built-In Track-and-Hold Function
• No Missing Codes
• No External Clocking
• Single Supply—5 V_DC
• 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 V_CC
• 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: ±½ LSB and ± 1 LSB

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