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ADS1231 Datasheet(PDF) 10 Page - Texas Instruments |
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ADS1231 Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 23 page  Z =500MW EFF AVDD Z =500MW EFF VREFP VREFN AVDD ESD Protection C BUF Bridge Sensor +VDD AINP AINN VREFN SW GND ADS1231 VREFP ADS1231 SBAS414C – JULY 2009 – REVISED DECEMBER 2010 www.ti.com VOLTAGE REFERENCE INPUTS LOW-SIDE POWER SWITCH (SW) (VREFP, VREFN) The ADS1231 incorporates an internal switch for use The voltage reference used by the modulator is with an external bridge sensor, as shown in generated from the voltage difference between Figure 15. The switch can be used in a return path for VREFP and VREFN: VREF = VREFP – VREFN. The the bridge power. By opening the switch, power reference inputs use a structure similar to that of the dissipation in the bridge is eliminated. analog inputs. In order to increase the reference input The switch is controlled by the ADS1231 conversion impedance, switching buffer circuitry is used to status. During normal conversions, the switch is reduce the input equivalent capacitance. The closed (the SW pin is connected to GND). During reference drift and noise impact ADC performance. In standby or power-down modes, the switch is opened order to achieve best results, pay close attention to (the SW pin is high impedance). When using the the reference noise and drift specifications. A switch, it is recommended that the negative reference simplified diagram of the circuitry on the reference input (VREFN) be connected directly to the bridge inputs is shown in Figure 14. The switches and ground terminal, as shown in Figure 15 for best capacitors can be modeled approximately using an performance. effective impedance of: Figure 14. Simplified Reference Input Circuitry ESD diodes protect the reference inputs. To prevent these diodes from turning on, make sure the voltages Figure 15. Low-Side Power Switch on the reference pins do not go below GND by more than 100mV, and likewise, do not exceed AVDD by 100mV: CLOCK SOURCE GND – 100mV < (VREFP or VREFN) < AVDD + The ADS1231 uses an internal oscillator. No external 100mV clock circuitry is required. 10 Submit Documentation Feedback Copyright © 2009–2010, Texas Instruments Incorporated |
Similar Part No. - ADS1231_14 |
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Similar Description - ADS1231_14 |
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