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AD7819YRU 데이터시트(PDF) 1 Page - Analog Devices |
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AD7819YRU 데이터시트(HTML) 1 Page - Analog Devices |
1 / 11 page 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. a AD7819 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 2.7 V to 5.5 V, 200 kSPS 8-Bit Sampling ADC FUNCTIONAL BLOCK DIAGRAM CLOCK OSC CHARGE REDISTRIBUTION DAC THREE- STATE DRIVERS CONTROL LOGIC BUSY CS RD CONVST VIN VDD AGND VREF DB7 DB0 COMP T/H AD7819 FEATURES 8-Bit ADC with 4.5 s Conversion Time On-Chip Track and Hold Operating Supply Range: 2.7 V to 5.5 V Specifications at 2.7 V – 3.6 V and 5 V 10% 8-Bit Parallel Interface 8-Bit Read Power Performance Normal Operation 10.5 mW, VDD = 3 V Automatic Power-Down 57.75 W @ 1 kSPS, VDD = 3 V Analog Input Range: 0 V to VREF Reference Input Range: 1.2 V to VDD GENERAL DESCRIPTION The AD7819 is a high speed, microprocessor-compatible, 8-bit analog-to-digital converter with a maximum throughput of 200 kSPS. The converter operates off a single 2.7 V to 5.5 V supply and contains a 4.5 µs successive approximation A/D converter, track/hold circuitry, on-chip clock oscillator and 8-bit wide parallel interface. The parallel interface is designed to allow easy interfacing to microprocessors and DSPs. Using only address decoding logic the AD7819 is easily mapped into the microprocessor address space. When used in its power-down mode, the AD7819 automatically powers down at the end of a conversion and powers up at the start of a new conversion. This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7819 can also operate in a high speed mode where the part is not powered down between conversions. In this mode of opera- tion the part is capable of providing 200 kSPS throughput. The part is available in a small, 16-lead 0.3" wide, plastic dual- in-line package (DIP); in a 16-lead, 0.15" wide, narrow body small outline IC (SOIC) and in a 16-lead, narrow body, thin shrink small outline package (TSSOP). PRODUCT HIGHLIGHTS 1. Low Power, Single Supply Operation The AD7819 operates from a single 2.7 V to 5.5 V supply and typically consumes only 10.5 mW of power. The power dissipation can be significantly reduced at lower through- put rates by using the automatic power-down mode. 2. Automatic Power-Down The automatic power-down mode, whereby the AD7819 goes into power-down mode at the end of a conversion and powers up before the next conversion, means the AD7819 is ideal for battery powered applications; e.g., 57.75 µW @ 1 kSPS. (See Power vs. Throughput Rate section.) 3. Parallel Interface An easy to use 8-bit wide parallel interface allows interfacing to most popular microprocessors and DSPs with minimal external circuitry. 4. Dynamic Specifications for DSP Users In addition to the traditional ADC specifications, the AD7819 is specified for ac parameters, including signal-to-noise ratio and distortion. |
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