Features and Benefits
- AC and DC Characterized and Specified (K, B and T Grades)
- 128k Conversions per Second
- 1 MHz Full Power Bandwidth
- 500 kHz Full Linear Bandwidth
- 80 dB S/N+D (K, B, T Grades)
- Twos Complement Data Format (Bipolar Mode)
- Straight Binary Data Format (Unipolar Mode)
- 10 M Ω Input Impedance
- 8-Bit Bus Interface (See AD779 for 16-Bit Interface)
- On-Board Reference and Clock
- 10 V Unipolar or Bipolar Input Range
- Pin Compatible with AD678 12-Bit, 200 kSPS ADC
The AD679 is a complete, multipurpose 14-bit monolithic analog-to-digital converter, consisting of a sample-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 which 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 M ohm) 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.
This product is fabricated on Analog Devices' BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits; laser-trimmed thin-film resistors provide high accuracy. The converter utilizes a recursive subranging algorithm which includes error correction and flash converter circuitry to achieve high speed and resolution.
The AD679 operates from +5 V and ±12 V supplies and dissipates 560 mW (typ). 28-pin plastic DIP, ceramic DIP and 44 J-leaded ceramic surface mount packages are available.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.