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ADS1000A1IDBVT Datasheet(PDF) 11 Page - Texas Instruments |
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ADS1000A1IDBVT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 23 page www.ti.com APPLICATION INFORMATION BASIC CONNECTIONS 1 2 3 6 5 4 V IN - V IN+ SCL GND V DD SDA ADS1000 PositiveInput (0Vto5V) NegativeInput (0Vto5V) V DD V DD 4.7 F(typ.) m Microcontrolleror Microprocessor withI CPort 2 SCL SDA I CPull-UpResistors 1k to10k (typ.) W W 2 ADS1000 SBAS357A – SEPTEMBER 2006 – REVISED OCTOBER 2007 The ADS1000 interfaces directly to standard mode, fast mode, and high-speed mode I2C controllers. Any microcontroller I2C peripheral, including master-only For many applications, connecting the ADS1000 is and non-multiple-master I2C peripherals, will work extremely simple. A basic connection diagram for the with the ADS1000. The ADS1000 does not perform ADS1000 is shown in Figure 9. clock-stretching (that is, it never pulls the clock line The fully differential voltage input of the ADS1000 is low), so it is not necessary to provide for this unless ideal for connection to differential sources with other devices are on the same I2C bus. moderately low source impedance, such as bridge Pull-up resistors are necessary on both the SDA and sensors and thermistors. Although the ADS1000 can SCL lines because I2C bus drivers are open-drain. read bipolar differential signals, it cannot accept The size of these resistors depends on the bus negative voltages on either input. It may be helpful to operating speed and capacitance of the bus lines. think of the ADS1000 positive voltage input as Higher-value resistors consume less power, but noninverting, and of the negative input as inverting. increase the transition times on the bus, limiting the When the ADS1000 is converting, it draws current in bus speed. Lower-value resistors allow higher speed short spikes. The 0.1 μF bypass capacitor supplies at the expense of higher power consumption. Long the momentary bursts of extra current needed from bus lines have higher capacitance and require the supply. smaller pullup resistors to compensate. The resistors should not be too small; if they are, the bus drivers may not be able to pull the bus lines low. Figure 9. Typical Connections of the ADS1000 Copyright © 2006–2007, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): ADS1000 |
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