Analog Devices AD679
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. The 14 data bits are accessed in two read operations (8 + 6), with left justification.
| Part No. |
AD679 |
| Datasheet |
AD679
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| Manufacturer |
 Analog Devices |
| Description |
14-Bit 128 kSPS Complete Sampling ADC |
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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
In addition, the AD679K, B, and T grades are fully specified for dc parameters that are important in measurement applications. 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 microprocessor control or by an external clock asynchronous to the system clock.
