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PDF XTR111 Data sheet ( Hoja de datos )
| Número de pieza | XTR111 | |
| Descripción | Precision Voltage-to-Current Converter/Transmitter | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de XTR111 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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XTR111
XRT1 11
Precision Voltage-to-Current
Converter/Transmitter
SBOS375 − NOVEMBER 2006
FEATURES
D EASY-TO-DESIGN INPUT/OUTPUT RANGES:
0mA−20mA, 4mA−20mA, 5mA−25mA
AND VOLTAGE OUTPUTS
D NONLINEARITY: 0.002%
D LOW OFFSET DRIFT: 1µV/5C
D ACCURACY: 0.015%
D SINGLE-SUPPLY OPERATION
D WIDE SUPPLY RANGE: 7V TO 44V
D OUTPUT ERROR FLAG (EF)
D OUTPUT DISABLE (OD)
D ADJUSTABLE VOLTAGE REGULATOR:
3V TO 15V
APPLICATIONS
D UNIVERSAL VOLTAGE-CONTROLLED
CURRENT SOURCE
D CURRENT OR VOLTAGE OUTPUT FOR
3-WIRE SENSOR SYSTEMS
D PLC OUTPUT PROGRAMMABLE DRIVER
D CURRENT-MODE SENSOR EXCITATION
DESCRIPTION
The XTR111 is a precision voltage-to-current converter
designed for the standard 0mA−20mA or 4mA−20mA
analog signals, and can source up to 36mA. The ratio
between input voltage and output current is set by the
single resistor RSET. The circuit can also be modified for
voltage output.
An external P-MOSFET transistor ensures high output
resistance and a broad compliance voltage range
extending from 2V below the supply voltage, VVSP, to
voltages well below GND.
The adjustable 3V to 15V sub-regulator output provides
the supply voltage for additional circuitry.
The XTR111 is available in a DFN surface-mount package.
REGF
5
Regulator
Out
REGS
4
3V
Signal
Input 6
VIN
24V
1
XTR111
VSP
I−Mirror
9
OD
EF 8
IS 2
Output Disable
Output Failure
VG 3 S
G
ISET
D IOUT
Load 0mA to 20mA
4mA to 20mA
(± Load Ground)
GND
10
SET
7
RSET
( )IOUT = 10
VVIN
RSET
IOUT = 10 • ISET
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments
semiconductor products and disclaimers thereto appears at the end of this data sheet.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Products
conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright 2006, Texas Instruments Incorporated
www.ti.com
1 page  
www.ti.com
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C and VVSP = +24V, unless otherwise noted.
NONLINEARITY DISTRIBUTION
XTR111
SBOS375 − NOVEMBER 2006
GAIN ERROR DISTRIBUTION
Nonlinearity (%)
0.03
NONLINEARITY vs TEMPERATURE
0.02
0.01
0.1mA to 25mA
0
−0.01
4mA to 20mA
−0.02
−0.03
−75 −50 −25
0
25 50 75 100 125
Temperature (_C)
0.15
GAIN ERROR vs TEMPERATURE
0.10
0.05
0
4mA to 20mA
−0.05
−0.10
0.1mA to 25mA
−0.15
−75 −50 −25
0
25 50 75 100 125
Temperature (_C)
Gain Error (%)
NONLINEARITY DRIFT DISTRIBUTION
(IOUT = 0.1mA to 25mA; T = −55_C to +125_C)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
Nonlinearity Drift (ppm/_C)
GAIN ERROR DRIFT DISTRIBUTION
(IOUT = 0.1mA to 25mA; T = −55_C to +125_ C)
−10 −9 −8 −7 −6 −5 −4 −3 −2 −1
Gain Error Drift (ppm/_ C)
0
5
5 Page 
XTR111
www.ti.com
EXPLANATION OF PIN FUNCTIONS
VIN: This input is a conventional, noninverting, high-
impedance input of the internal operational amplifier
(OPA). The internal circuitry is protected by clamp diodes
to supplies. An additional clamp connected to
approximately 18V protects internal circuitry. Place a small
resistor in series with the input to limit the current into the
protection if voltage can be present without the XTR111
being powered. Consider a resistor value equal to RSET for
bias current cancellation.
SET: The total resistance connected between this pin and
VIN reference sets the transconductance. Additional
series resistance can degrade accuracy and drift. The
voltage on this pin must not exceed 14V because this pin
is not protected to voltages above this level.
IS: This output pin is connected to the transistor source of
the external FET. The accuracy of the output current to IS
is achieved by dynamic error correction in the current
mirror. This pin should never be pulled more than 6.5V
below the positive supply. An internal clamp is provided to
protect the circuit, but it must be current-limited externally
to less than 25mA.
VG: The gate drive for the external FET is protected
against shorts to the supply and GND. The circuit is
clamped so that it will not drive more than 18V below the
positive supply. The external FET should be protected if its
gate could be externally pulled beyond its ratings.
SBOS375 − NOVEMBER 2006
REGF: The output of the regulator buffer can source up to
5mA current, but has very limited (less than 50µA) sinking
capability. The maximum short-circuit current is in the
range of 15mA to 25mA, changing over temperature.
REGS: This pin is the sense input of the voltage regulator.
It is referenced to an internal 3V reference circuit. The input
bias current can be up to 2µA. Avoid capacitive loading of
REGS that may compromise the loop stability of the
voltage regulator.
VSP: The supply voltage of up to a maximum of 44V allows
operation in harsh industrial environment and provides
headroom for easy protection against over-voltage. Use a
large enough bypass capacitor (> 100nF) and eventually
a damping inductor or a small resistor (5Ω) to decouple the
XTR111 supply from the noise typically found on the 24V
supplies.
EF: The active low error flag (logic output) is intended for
use with an external pull-up to logic-high for reliable
operation when this output is used. However, it has a weak
internal pull-up to 5V and can be left unconnected if not
used.
OD: This control input has a 4µA internal pull-up disabling
the output. A pull-down or short to GND is required to
activate the output. Controlling OD reduces output glitches
during power-on and power-off. This logic input controls
the output. If not used, connect to GND.
The regulator is not affected by OD.
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet XTR111.PDF ] | |
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