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AD7870A Dataheets PDF



Part Number AD7870A
Manufacturers Analog Devices
Logo Analog Devices
Description LC2MOS Complete/ 12-Bit/ 100 kHz / Sampling ADC
Datasheet AD7870A DatasheetAD7870A Datasheet (PDF)

a LC2MOS Complete, 12-Bit, 100 kHz , Sampling ADC AD7870A FUNCTIONAL BLOCK DIAGRAM FEATURES Complete Monolithic 12-Bit ADC with: 2 ␮s Track/Hold Amplifier 8 ␮s A/D Converter On-Chip Reference Laser-Trimmed Clock Parallel, Byte and Serial Digital Interface 70 dB SNR at 10 kHz Input Frequency 57 ns Data Access Time Low Power—60 mW typ APPLICATIONS Digital Signal Processing Speech Recognition and Synthesis Spectrum Analysis High Speed Modems DSP Servo Control GENERAL DESCRIPTION The AD7870A is .

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a LC2MOS Complete, 12-Bit, 100 kHz , Sampling ADC AD7870A FUNCTIONAL BLOCK DIAGRAM FEATURES Complete Monolithic 12-Bit ADC with: 2 ␮s Track/Hold Amplifier 8 ␮s A/D Converter On-Chip Reference Laser-Trimmed Clock Parallel, Byte and Serial Digital Interface 70 dB SNR at 10 kHz Input Frequency 57 ns Data Access Time Low Power—60 mW typ APPLICATIONS Digital Signal Processing Speech Recognition and Synthesis Spectrum Analysis High Speed Modems DSP Servo Control GENERAL DESCRIPTION The AD7870A is a fast, complete, 12-bit A/D converter. It consists of a track/hold amplifier, 8 µs successive approximation ADC, 3 V buried Zener reference and versatile interface logic. The ADC features a self-contained internal clock that is laser trimmed to guarantee accurate control of conversion time. No external clock timing components are required; the on-chip clock may be overridden by an external clock if required. AD7870A offers a choice of three data output formats: a single, parallel, 12-bit word, two 8-bit bytes or serial data. Fast bus access times and standard control inputs ensure easy interfacing to modern microprocessors and digital signal processors. The AD7870A operates from ± 5 V power supplies, accepts bipolar input signals of ± 3 V and can convert full power signals up to 50 kHz. In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the AD7870A is also fully specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. The AD7870A is fabricated in Analog Devices’ linear compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-pin, 0.3-inch wide, plastic dual inline package (DIP). PRODUCT HIGHLIGHTS 1. Complete 12-bit ADC on a chip. The AD7870A is the most complete monolithic ADC available and combines a 12-bit ADC with internal clock, track/ hold amplifier and reference on a single chip. 2. Dynamic specifications for DSP users. The AD7870A is fully specified and tested for ac parameters, including signal-to-noise ratio, harmonic distortion and intermodulation distortion. Key digital timing parameters are also tested and guaranteed over the full operating temperature range. 3. Fast microprocessor interface. Data access times of 57 ns make the AD7870A compatible with modern 8- and 16-bit microprocessors and digital signal processors. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 199.


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