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XTR111 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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XTR111 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 22 page XTR111 SBOS375 − NOVEMBER 2006 www.ti.com 10 APPLICATION INFORMATION The XTR111 is a voltage-controlled current source capa- ble of delivering currents from 0mA to 36mA. The primary intent of the device is to source the commonly-used indus- trial current ranges of 0mA−20mA or 4mA−20mA. The per- formance is specified for a supply voltage of up to 40V. The maximum supply voltage is 44V. The voltage-to-current ra- tio is defined by an external resistor, RSET; therefore, the in- put voltage range can be freely set in accordance with the application requirement. The output current is cascoded by an external P-Channel MOSFET transistor for large voltage compliance extending below ground, and for easy power dissipation. This arrangement ensures excellent suppression of typical interference signals from the indus- trial environment because of the extremely high output im- pedance and wide voltage compliance. An error detection circuit activates a logic output (error flag) in case the output current cannot correctly flow. It indi- cates a wire break, high load resistor, or loss of headroom for the current output to the positive supply. The output disable (OD) provided can be used during pow- er-on, multiplexing and other conditions where the output should present no current. It has an internal pull-up that causes the XTR111 to come up in output disable mode un- less the OD pin is tied low. The onboard voltage regulator can be adjusted between 3V to 15V and delivers up to 5mA load current. It is in- tended to supply signal conditioning and sensor excitation in 3-wire sensor systems. Voltages above 3V can be set by a resistive divider. Figure 1 shows a basic connection for the XTR111. The in- put voltage VVIN reappears across RSET and controls 1/10 of the output current. The I-Mirror has a precise current gain of 10. This configuration leads to the transfer function: IOUT = 10 • (VVIN/RSET) The output of the voltage regulator can be set over the range of 3V to 12V by selecting R1 and R2 using the follow- ing equation. VREGF = 3V • (R1 + R2)/R2 3V REGF REGS 5V Signal Source (Sensor or DAC, for example) V VSP = 24V Supply I−Mirror VSP 1 9 8 2 3S D G VG IS Q EXT P−Channel MOSFET (Pull Low for Normal Operation) 0mA or 4mA to 20mA OD EF C 1 R 2 8.2k Ω VIN 6 4 5 R SET SET 7 10 GND R 1 5.6k Ω V OUT Load I OUT ( ± Load Ground) I OUT =10 () V VIN R SET Figure 1. Basic Connection for 0mA to 20mA Related to 0V to 5V Signal Input. The Voltage Regulator is Set to 5V Output. |
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