DESCRIPTION
By using a half-flash conversion technique, the 8-bit ADC0820 CMOS A/D offers a 1.5µs conversion time while dissipating a maximum 75mW of power. The half-flash technique consists of 31 comparators, a most significant 4-bit ADC and a least significant 4-bit ADC.
The input to the ADC0820 is tracked and held by the input sampling circuitry, eliminating the need for an external sample-and-hold for signals slewing at less than 100mV/µs.
For ease of interface to microprocessors, the ADC0820 has been designed to appear as a memory location or I/O port without the need for external interfacing logic.
FEATURES
⢠Built-in track-and-hold function
⢠No missing codes
⢠No external clocking
⢠Single supplyâ5VDC
⢠Easy interface to all microprocessors, or operates stand-alone
⢠Latched 3-State outputs
⢠Logic inputs and outputs meet both MOS and TTL voltage level
specifications
⢠Operates ratiometrically or with any reference value equal to or
less than VDD
⢠0V to 5V analog input voltage range with single 5V supply
⢠No zero- or full-scale adjust required
⢠Overflow output available for cascading
⢠0.3Ⳡstandard width 20-pin DIP
APPLICATIONS
⢠Microprocessor-based monitoring and control systems
⢠Transducer/µP interface
⢠Process control
⢠Logic analyzers
⢠Test and measurement
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