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XTR108 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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XTR108 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 27 page XTR108 8 SBOS187B www.ti.com TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, V+ = 24V, unless otherwise noted. RVI = 6.34kΩ. INPUT NOISE POWER DENSITY 10 100 1k 10k 1 Frequency (Hz) 1000 100 10 C FILT = 0.01 PGA PEAK-TO-PEAK NOISE (RTI) 5s/div BW: 0.1Hz to 10Hz OVERVIEW The XTR108 is a 4-20mA current-loop transmitter that allows the user to digitally adjust the gain, offset, and linearity correction of the analog output to calibrate the sensor. The digital data for adjustment are stored in an external EEPROM device. The analog signal path is composed of a compound multi- plexer (MUX), programmable gain instrumentation amplifier (PGA), and an output current amplifier. Analog support func- tions include digitally controlled current sources for sensor excitation, PGA offset control, linearization, voltage refer- ence, and voltage regulator. The digital interface communicates with external devices for calibration and to store the resultant data in an SPI compat- ible EEPROM. A complete system is shown in Figure 1. The XTR108 serial interface is SPI compatible and only requires four connections to the calibration controller: a serial clock (SCLK), a serial data line (SDIO), a chip select line (CS1), and a ground sense line. All logic signals to the XTR108 must be referenced to the potential of the ground sense line (IRET pin on the XTR108). Within this entire system there may exist three different “GND” voltage levels. In addition, the voltage difference between the IRET and IO potential will depend on the output current level. It is not certain that the “GND” potential of the calibration system will be at the same potential of either the IRET or IO potential, and therefore the isolation couplers are shown in Figure 1. All voltages specified for the XTR108 are with reference to the IRET pin. EE PROM SDIO SCLK CS1 Isolation Couplers IO IRET XTR108 RV RX GND PS Calibration System Calib GND TX GND FIGURE 1. Complete System Level Configuration with Three Unique Ground Voltage Levels. The XTR108 also needs to communicate with the external EEPROM device independently from the calibration control- ler to retrieve the calibration constants during normal opera- tion. The XTR108 provides a second chip select function (CS2) for the EEPROM device to facilitate this communica- tion. |
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Similar Description - XTR108 |
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