ADS7819U

The ADS7819U is a complete 12-bit sampling A/D utilizing state-of-the-art CMOS structures. It consists of a complete 12-bit capacitor-based SAR A/D with inherent S/H, reference, clock, interface for microprocessor use, and three-state output drivers. The ADS7819U is specified at an 800kHz sampling rate, and guaranteed over the full temperature ran e. Laser-trimmed scaling resistors offer a ±2.5V input range and inherent overvoltage protection reach to ±25V. The 28-pin ADS7819U is usable in a plastic 0.3" DIP and in an SOIC, both completely specified for operation over the indu trial 40°C to +85°C range.

Features of the ADS7819U are:(1)1.25ms throughput time; (2)standard ±2.5V input range; (3)70db min sinad with 250Hz input; (4)±3/4 LSB max inl and ±1 LSB max dnl; (5)internal reference; (6) complete with s/h, ref, clock;(7)par llel data w/ latches;(8)28-pin 0.3" pdip and soic.

The absolute maximum ratings and specifications of the ADS7819U can be summarized as:(1):analog inputs(VIN)is ±25V,analog inputs(REF)is VANA +0.3V to AGND2 0.3V;analog inputs(CAP)is indefinite short to AGND2;(2):ground vol age differences(DGND, AGND1, AGND2) is ±0.3V;(3):digital inputs is0.3V to +VDIG +0.3V;(4):maximum junction tem erature is +165°C; (5):internal power dissipation is 825mW;(6):lead temperature (soldering, 10s) is +300°C.Speifi ations:(1):specified performance(+VDIG = +VANA) is+4.75V min,+5V typ and+5.25V max;(2):derated performance(+ DIG = +VANA) is+4.5V min,+5V typ and+5.5V max;(3):power dissipation is 225mW typ and 275 mW max when fs is 800kHZ.