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部品型式

AD7866BRU

製品説明
仕様・特性

Dual 1 MSPS, 12-Bit, 2-Channel SAR ADC with Serial Interface AD7866 FEATURES Dual 12-Bit, 2-Channel ADC Fast Throughput Rate: 1 MSPS Specified for VDD of 2.7 V to 5.25 V Low Power 11.4 mW Max at 1 MSPS with 3 V Supplies 24 mW Max at 1 MSPS with 5 V Supplies Wide Input Bandwidth 70 dB SNR at 300 kHz Input Frequency On-Board Reference 2.5 V –40؇C to +125؇C Operation Flexible Power/Throughput Rate Management Simultaneous Conversion/Read No Pipeline Delays High Speed Serial Interface SPITM/QSPITM/ MICROWIRETM/DSP Compatible Shutdown Mode: 1 ␮A Max 20-Lead TSSOP Package GENERAL DESCRIPTION The AD7866 is a dual 12-bit high speed, low power, successive approximation ADC. The part operates from a single 2.7 V to 5.25 V power supply and features throughput rates up to 1 MSPS. The device contains two ADCs, each preceded by a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 10 MHz. The conversion process and data acquisition are controlled using standard control inputs, allowing easy interfacing to microprocessors or DSPs. The input signal is sampled on the falling edge of CS; conversion is also initiated at this point. The conversion time is determined by the SCLK frequency. There are no pipelined delays associated with the part. The AD7866 uses advanced design techniques to achieve very low power dissipation at high throughput rates. With 3 V supplies and 1 MSPS throughput rate, the part consumes a maximum of 3.8 mA. With 5 V supplies and 1 MSPS, the current consumption is a maximum of 4.8 mA. The part also offers flexible power/throughput rate management when operating in sleep mode. The analog input range for the part can be selected to be a 0 V to VREF range or a 2 ϫ VREF range with either straight binary or twos complement output coding. The AD7866 has an on-chip 2.5 V reference that can be overdriven if an external reference is preferred. Each on-board ADC can also be supplied with a separate individual external reference. FUNCTIONAL BLOCK DIAGRAM DCAPA REF SELECT VREF 2.5V REF VA1 VA2 MUX DVDD AD7866 BUF T/H AVDD 12-BIT SUCCESSIVE APPROXIMATION ADC OUTPUT DRIVERS A0 RANGE SCLK CS VDRIVE CONTROL LOGIC VB1 VB2 MUX T/H DOUTA 12-BIT SUCCESSIVE APPROXIMATION ADC OUTPUT DRIVERS DOUT B BUF AGND AGND DCAPB DGND PRODUCT HIGHLIGHTS 1. The AD7866 features two complete ADC functions, allowing simultaneous sampling and conversion of two channels. Each ADC has a 2-channel input multiplexer. The conversion result of both channels is available simultaneously on separate data lines, or may be taken on one data line if only one serial port is available. 2. High Throughput with Low Power Consumption—The AD7866 offers a 1 MSPS throughput rate with 11.4 mW maximum power consumption when operating at 3 V. 3. Flexible Power/Throughput Rate Management—The conversion rate is determined by the serial clock, allowing the power consumption to be reduced as the conversion time is reduced through a SCLK frequency increase. Power efficiency can be maximized at lower throughput rates if the part enters sleep during conversions. 4. No Pipeline Delay—The part features two standard successive approximation ADCs with accurate control of the sampling instant via a CS input and once off conversion control. The AD7866 is available in a 20-lead thin shrink small outline (TSSOP) package. REV. A 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. 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 companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 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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