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ADS1131 Datasheet(PDF) 7 Page - Texas Instruments |
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ADS1131 Datasheet(HTML) 7 Page - Texas Instruments |
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7 / 20 page  Z =500MW EFF AVDD Z =500MW EFF VREFP VREFN AVDD ESD Protection C BUF Bridge Sensor +VDD AINP AINN VREFN SW GND ADS1131 VREFP ADS1131 www.ti.com SBAS449B – JULY 2009 – REVISED SEPTEMBER 2011 VOLTAGE REFERENCE INPUTS LOW-SIDE POWER SWITCH (SW) (VREFP, VREFN) The ADS1131 incorporates an internal switch for use The voltage reference used by the modulator is with an external bridge sensor, as shown in Figure 3. generated from the voltage difference between The switch can be used in a return path for the bridge VREFP and VREFN: VREF = VREFP – VREFN. The power. By opening the switch, power dissipation in reference inputs use a structure similar to that of the the bridge is eliminated. analog inputs. In order to increase the reference input The switch is controlled by the ADS1131 conversion impedance, a 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 2. The switches and ground terminal, as shown in Figure 3 for best capacitors can be modeled approximately using an performance. effective impedance of: Figure 2. Simplified Reference Input Circuitry ESD diodes protect the reference inputs. To prevent these diodes from turning on, make sure the voltages Figure 3. 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 ADS1131 uses an internal oscillator. No external 100mV clock circuitry is required. Copyright © 2009–2011, Texas Instruments Incorporated Submit Documentation Feedback 7 |
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