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AD7870CQ データシート(PDF) 1 Page - Analog Devices |
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AD7870CQ データシート(HTML) 1 Page - Analog Devices |
1 / 20 page a AD7870/AD7875/AD7876 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 72 dB SNR at 10 kHz Input Frequency (AD7870, AD7875) 57 ns Data Access Time Low Power: –60 mW typ Variety of Input Ranges: 3 V for AD7870 0 V to +5 V for AD7875 10 V for AD7876 GENERAL DESCRIPTION The AD7870/AD7875/AD7876 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 which is laser trimmed to guarantee accurate control of conversion time. No external clock timing components are re- quired; the on-chip clock may he overridden by an external clock if required. The parts offer a choice of three data output formats: a single, parallel, 12-bit word; two 8-bit bytes or serial data. Fast bus ac- cess times and standard control inputs ensure easy interfacing to modern microprocessors and digital signal processors. All parts operate from ±5 V power supplies. The AD7870 and AD7876 accept input signal ranges of ±3 V and ±10 V, respec- tively, while the AD7875 accepts a unipolar 0 V to +5 V input range. The parts can convert full power signals up to 50 kHz. The AD7870/AD7875/AD7876 feature dc accuracy specifica- tions such as linearity, full-scale and offset error. In addition, the AD7870 and AD7875 are fully specified for dynamic perfor- mance parameters including distortion and signal-to-noise ratio. The parts are available in a 24-pin, 0.3 inch-wide, plastic or her- metic dual-in-line package (DIP). The AD7870 and AD7875 are available in a 28-pin plastic leaded chip carrier (PLCC), while the AD7876 is available and in a 24-pin small outline (SOIC) package. PRODUCT HIGHLIGHTS 1. Complete 12-Bit ADC on a Chip. The AD7870/AD7875/AD7876 provides all the functions necessary for analog-to-digital conversion 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 AD7870 and AD7875 are fully specified and tested for ac parameters, including signal-to-noise ratio, harmonic dis- tortion and intermodulation distortion. 3. Fast Microprocessor Interface. Data access times of 57 ns make the parts compatible with modern 8- and 16-bit microprocessors and digital signal pro- cessors. Key digital timing parameters are tested and guaran- teed over the full operating temperature range. FUNCTIONAL BLOCK DIAGRAM LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs REV. B 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., 1997 |
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同様の説明 - AD7870CQ |
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