Part # AD679 datasheet

Part Manufacturer: Analog Devices

Analog Devices

Part Description: AD679 14-Bit 128 kSPS Complete Sampling ADC Data Sheet (REV. D)


Part Details:

a 14-Bit 128 kSPS Complete Sampling ADC AD679* FEATURES FUNCTIONAL BLOCK DIAGRAM AC and DC Characterized and Specified (K, B, T Grades) 128k Conversions per Second1 MHz Full Power Bandwidth500 kHz Full Linear Bandwidth78 dB S/N+D (K, B, T Grades)Twos Complement Data Format (Bipolar Mode)Straight Binary Data Format (Unipolar Mode)10 M Input Impedance8-Bit Bus InterfaceOn-Board Reference and Clock10 V Unipolar or Bipolar Input RangePin Compatible with AD678 12-Bit, 200 kSPS ADCMIL-STD-883 Compliant Versions Available GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD679 is a complete, multipurpose 14-bit monolithic 1. COMPLETE INTEGRATION: The AD679 minimizes analog-to-digital converter, consisting of a sample-and-hold am- external component requirements by combining a high plifier (SHA), a microprocessor-compatible bus interface, a volt- speed sample-and-hold amplifier (SHA), ADC, 5 V refer- age reference, and clock generation circuitry. ence, clock, and digital interface on a single chip. Thisprovides a fully specified sampling A/D function unattain- The AD679 is specified for ac (or dynamic) parameters such as able with discrete designs. S/N+D ratio, THD, and IMD, which are important in signalprocessing applications. In addition, the AD679K, B, and T 2. SPECIFICATIONS: The AD679K, B, and T grades provide grades are fully specified for dc parameters that are important in fully specified and tested ac and dc parameters. The AD679J, measurement applications. A, and S grades are specified and tested for ac parameters; dcaccuracy specifications are shown as typicals. DC specifica- The 14 data bits are accessed in two read operations (8 + 6), tions (such as INL, gain, and offset) are important in control with left justification. Data format is straight binary for unipolar and measurement applications. AC specifications (such as mode and twos complement binary for bipolar mode. The input S/N+D ratio, THD, and IMD) are of value in signal process- has a full-scale range of 10 V with a full power bandwidth of ing applications. 1 MHz and a full linear bandwidth of 500 kHz. High inputimpedance (10 M) allows direct connection to unbuffered 3. EASE OF USE: The pinout is designed for easy board layout, sources without signal degradation. Conversions can be initiated and the two-read output provides compatibility with 8-bit either under microprocessor control or by an external clock buses. Factory trimming eliminates the need for calibration asynchronous to the system clock. modes or external trimming to achieve rated performance. This product is fabricated on Analog Devices BiMOS process, 4. RELIABILITY: The AD679 utilizes Analog Devices mono- combining low power CMOS logic with high precision, low lithic BiMOS technology. This ensures long-term reliability noise bipolar circuits; laser-trimmed thin-film resistors provide compared to multichip and hybrid designs. high accuracy. The converter utilizes a recursive subranging 5. UPGRADE PATH: The AD679 provides the same pinout as algorithm that includes error correction and flash converter the 12-bit, 200 kSPS AD678 ADC. circuitry to achieve high speed and resolution. 6. The AD679 is available in versions compliant with MIL-


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AD679.pdf Datasheet