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AD7995 датащи(PDF) 1 Page - Analog Devices |
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AD7995 датащи(HTML) 1 Page - Analog Devices |
1 / 25 page 4-Channel, 12-/10-/8-Bit ADC with I2C- Compatible Interface in 8-Lead SOT23 Preliminary Technical Data AD7991/AD7995/AD7999 Rev. PrB Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. 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 ©2006 Analog Devices, Inc. All rights reserved. FEATURES 12-/10-/8-bit ADC with fast conversion time: 2 µs typ 4 Channel / 3 Channel with Reference input Specified for VDD of 2.7 V to 5.5 V Sequencer operation Temperature Range: -40 °C to 125 °C I2C®-compatible serial interface supports standard, fast, and High-speed modes 2 versions allow 2 I2C addresses Low power consumption Shutdown mode: 1 µA max 8-lead SOT23 package APPLICATIONS System Monitoring Battery Powered Systems Data Acquisition Medical Instruments FUNCTIONAL BLOCK DIAGRAM T/H I/P MUX VIN0 VDD 12-/10-/8-BIT SAR ADC SCL SDA GND VIN1 AD7991/7995/7999 CONTROL LOGIC & I2C INTERFACE VIN2 VIN3/Vref Figure 1. GENERAL DESCRIPTION The AD7991/AD7995/AD7999 are 12-/10-/8-bit, low power, successive approximation ADCs with an I2C-compatible interface. The parts operate from a single 2.7 V to 5.5 V power supply and feature a 2 µs conversion time. The part contains a 4-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz. The AD7991/AD7995/AD7999 provides a 2-wire serial interface compatible with I2C interfaces. The parts come in two versions with each part having an individual I2C address. This will allow two of the same devices be connected to the same I2C bus. Both parts support standard, fast and high-speed I2C interface modes The AD7991/AD7995/AD7999 normally remain in a shutdown state while not converting, and power up only for conversions. The conversion process is controlled by a command mode, where every time an I2C read operation is executed on the AD7991/AD7995/AD7999, a conversion is performed and the result is returned on the I2C bus. The reference for the part is taken from VDD, this allows the widest dynamic input range to the ADC. Thus the analog input range to the ADC is 0V to VDD. An external reference may also be used with this part. The external reference may be applied through the Ain3 input. PRODUCT HIGHLIGHTS 1. 4 single ended analog input channels, with the option of having 3 single ended analog input channels and 1 reference input channel. 2. I2C compatible serial Interface. Standard, Fast and Hs- Modes 3. Automatic shutdown. 4. Reference derived from the power supply or external reference. 5. 8-lead SOT23 Package. Table 1 Related Devices Device Number Resolution Input Channels AD7998 12 8 AD7997 10 8 AD7994 12 4 AD7993 10 4 AD7992 12 2 |
Аналогичный номер детали - AD7995 |
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Аналогичное описание - AD7995 |
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