ADI AD7572AJNZ03

The AD7572A is an enhanced replacement for the industry standard AD7572. Improvements include faster conversion times of 3 μs for the AD7572AXX03 and 10 μs for the AD7572AXX10. The required power supplies are 5V and -12V or -15V. Additional features are better offset and gain error specifications over the original AD7572. The AD7572A is a complete 12-bit ADC that offers high speed performance combined with low, CMOS power levels. The part uses an accurate, high speed DAC and comparator in a successive-approximation loop to achieve a fast conversion time. An on-chip buried Zener diode provides a stable reference voltage to give low drift performance over the full temperature range and the specified accuracy is achieved without any user trims. An on-chip clock circuit is provided, which may be used with a crystal for stand-alone operation, or the clock input may be driven from an external clock source such as a divided-down microprocessor clock. The only other external components required for basic operation of the AD7572A are decoupling capacitors for the supply voltages and reference output. The AD7572A has a high speed digital interface with three-state data outputs and can operate under the control of standard microprocessor Read (RD) and decoded address (CS) signals. Interface timing is sufficiently fast to allow the AD7572A to operate with most microprocessors, with three-state enable times of only 90 ns and bus relinquish times of 75 ns. The AD7572A is fabricated in Analog Devices Linear Compatible CMoS process (LC²MOS), an advanced all ion-implanted process that combines fast CMOS logic and linear, bipolar circuits on a single chip, thus achieving excellent linear performance while retaining low CMOS power levels.

• Improved AD7572 Faster Conversion Time AD7572AXX03: 3 μs AD7572AXX10: 10 μs
• 5 V and -12 V or -15 V Power Supply Operation
• Better Offset and Gain Error Specifications
• Extended Plastic Temperature Range -40°C to +85°C
• Low Power: 100 mW
• Small 24-Pin, 0.3" Wide DIP and SOIC DIP Packages

• DSP applications
• wideband data acquisition systems