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AD7827 bảng dữ liệu(PDF) 1 Page - Analog Devices |
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AD7827 bảng dữ liệu(HTML) 1 Page - Analog Devices |
1 / 12 page 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. a AD7827 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., 1998 3 V/5 V, 1 MSPS, 8-Bit, Serial Interface Sampling ADC FUNCTIONAL BLOCK DIAGRAM FEATURES 8-Bit Half-Flash ADC with 420 ns Conversion Time 200 ns Acquisition Time 8-Lead Package On-Chip Track-and-Hold On-Chip 2.5 V Reference with 2% Tolerance Operating Supply Range: 3 V 10% and 5 V 10% Specifications @ 3 V and 5 V DSP/Microcontroller Compatible Serial Interface Automatic Power-Down at End of Conversion Input Ranges 0 V to 2 V, VDD = 3 V 0 V to 2.5 V, VDD = 5 V GENERAL DESCRIPTION The AD7827 is a high speed, single channel, low power, analog- to-digital converter with a maximum throughput of 1 MSPS that operates from a single 3 V or 5 V supply. The AD7827 contains a track/hold amplifier, an on-chip 2.5 V reference (2% toler- ance), a 420 ns 8-bit half-flash ADC and a serial interface. The serial interface is compatible with the serial interfaces of most DSPs (Digital Signal Processors). The throughput rate of the AD7827 is dependent on the clock speed of the DSP serial interface. The AD7827 combines the Convert Start and Power Down signals at one pin, i.e., the CONVST pin. This allows a unique automatic power-down at the end of a conversion to be imple- mented. The logic level on the CONVST pin is sampled at the end of a conversion and, depending on its state, the AD7827 powers down. The AD7827 has one single-ended analog input with an input span determined by the supply voltage. With a VDD of 3 V, the input range of the AD7827 is 0 V to 2 V and with VDD equal to 5 V, the input range is 0 V to 2.5 V. The parts are available in a small, 8-lead, 0.3" wide, plastic dual-in-line package (DIP) and an 8-lead, small outline IC (SOIC). PRODUCT HIGHLIGHTS 1. Fast Conversion Time The AD7827 has a conversion time of 420 ns. Faster conver- sion times maximize the DSP processing time in a real time system. 2. Built-In Track-and-Hold The analog input signal is held and a new conversion is initi- ated on the falling edge of the CONVST signal. The CONVST signal allows the sampling instant to be exactly controlled. This feature is a requirement in many DSP applications. 3. Automatic Power-Down The CONVST signal is sampled approximately 100 ns after the end of conversion and depending on its state the AD7827 is powered down. 4. An easy to use, fast serial interface allows direct interfacing to most popular DSPs with no external circuitry. BUF T/H 2.5V REF 8-BIT HALF-FLASH ADC SERIAL PORT CONTROL LOGIC VDD DETECT RFS DOUT SCLK CONVST GND VDD VREFIN/VREFOUT VIN COMP AD7827 |
Số phần tương tự - AD7827 |
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Mô tả tương tự - AD7827 |
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