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部品型式

AD7870AQ

製品説明
仕様・特性

LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs AD7870/AD7875/AD7876 FEATURES FUNCTIONAL BLOCK DIAGRAM AGND VIN REF OUT VDD INPUT SCALING AD7870/AD7875/ AD7876 TRACK-AND-HOLD COMP 3V REFERENCE 12-BIT DAC CLOCK CLK SAR + COUNTER 12/8/CLK CONTROL LOGIC CONVST CS RD BUSY/INT PARALLEL AND SERIAL INTERFACE DB11 DB0 DGND VSS 07730-001 Complete monolithic 12-bit ADCs with 2 μs track-and-hold amplifier 8 μs ADC 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 typical Variety of input ranges ±3 V for AD7870 0 V to +5 V for AD7875 ±10 V for AD7876 Figure 1. GENERAL DESCRIPTION The AD7870/AD7875/AD7876 are fast, complete, 12-bit analog-to-digital converters (ADCs). These converters consist of a track-and-hold amplifier, an 8 μs successive approximation ADC, a 3 V buried Zener reference, and versatile interface logic. The ADCs feature a self-contained internal clock which 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. 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 access 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, respectively, 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 specifications, such as linearity, full-scale and offset error. In addition, the AD7870 and AD7875 are fully specified for dynamic performance parameters including distortion and signal-tonoise ratio. The parts are available in a 24-pin, 0.3 inch-wide, plastic or hermetic 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 provide all the functions necessary for analog-to-digital conversion and combine a 12-bit ADC with internal clock, track-and-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 distortion and intermodulation distortion. 3. Fast microprocessor interface. Data access times of 57 ns make the parts compatible with modern 8-bit and 16-bit microprocessors and digital signal processors. Key digital timing parameters are tested and guaranteed over the full operating temperature range. Rev. C 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 that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©1997–2009 Analog Devices, Inc. All rights reserved.

ブランド

AD

会社名

Analog Devices

本社国名

U.S.A

事業概要

半導体デバイスを製造するアメリカの多国籍企業。特にADC、DAC、MEMS、DSPなどに強い。現在は 65nm から 3μm のプロセスルールの回路を設計している。

供給状況

 
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