AD579

The AD578 and AD579 are high speed 12-bit and 10-bit successive approximation analog-to-digital converters that include internal clock, reference, and comparator. Their hybrid design utilizes MSI digital and linear ICs in conjunction with a 12-bit or 10-bit monolithic, monotonic DAC to provide superior performance and versatility with IC size, price, and reliability. Important performance characteristics of the AD578 include ±1/2 LSB12 linearity error maximum at +25°C, maximum gain tempco of ±30 ppm/°C, and maximum conversion time of 3 us at a typical power dissipation of 555 mW. The 10-bit AD579 provides ± 1/2 LSB10 maximum linearity error at 1.8 us maximum, and 775 mW typical PD. Both the AD578 and AD579 include scaling resistors that provide analog input signal ranges of ±5 V, ±10 V, and 0 to +10 V. Both are contained in 32-pin ceramic side-brazed DIP packages, and are available with MIL-STD-883 class processing.

The features of AD579 can be summarized as (1)performance; (2)complete 12-Bit A/D converter with reference and clock; (3)fast conversion: 3s (max); (4)buried zener reference for long term stability and low gain: ±30ppm/°C max (AD578), ±40 ppm/°C max (AD579); (5)max nonlinearity: <±0.012%; (6)no missing codes over temperature; (7)low power: 555 mW (AD578); 775mW (AD579); (8)available to MIL-STD-883; (9)versatility; (10)positive-true parallel or serial logic qutputs; (11)short cycle capability; (12)precision +10 reference for external applications; (13)adjustable internal clock; (14)Z models for ±12V supplies.

The some absolute maximum ratings of AD579 are (1)resolution: 12 bits; (2)analog inputs voltage ranges: bipolar±5.0 V, ±10V, unipolar 0 to +10V, 0 to +20V; (3)input impedance : 0 to+10V, 5k(±20%), 10V,0 to +20V 10 k(±20%); (4)digital inputs; (5)convert command: 1 LSTTL load; (6)clock input 1 LSTTL load.