AD679

a FEATURES AC and DC Characterized and Specified (K, B, T Grades) 128k Conversions per Second 1 MHz Full Power Bandwidth 500 kHz Full Linear Bandwidth 78 dB S/N+D (K, B, T Grades) Twos Complement Data Format (Bipolar Mode) Straight Binary Data Format (Unipolar Mode) 10 M⍀ Input Impedance 8-Bit Bus Interface On-Board Reference and Clock 10 V Unipolar or Bipolar Input Range Pin Compatible with AD678 12-Bit, 200 kSPS ADC MIL-STD-883 Compliant Versions Available 14-Bit 128 kSPS Complete Sampling ADC AD679 FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION The AD679 is a complete, multipurpose 14-bit monolithic analog-to-digital converter, consisting of a sample-and-hold amplifier (SHA), a microprocessor-compatible bus interface, a voltage reference, and clock generation circuitry. The AD679 is specified for ac (or dynamic) parameters such as S/N+D ratio, THD, and IMD, which are important in signal processing applications. In addition, the AD679K, B, and T grades are fully specified for dc parameters that are important in measurement applications. The 14 data bits are accessed in two read operations (8 + 6), with left justification. Data format is straight binary for unipolar mode and twos complement binary for bipolar mode. The input has a full-scale range of 10 V with a full power bandwidth of 1 MHz and a full linear bandwidth of 500 kHz. High input impedance (10 MΩ) allows direct connection to unbuffered sources without signal degradation. Conversions can be initiated either under ...