XTR101 14-PIN PDS-627G 24VDC XTR101AG XTR101BG XTR101AP XTR101AU 40/RS XTR101A

XTR101 Precision, Low Drift 4-20mA TWO-WIRE TRANSMITTER FEATURES APPLICATIONS q INSTRUMENTATION AMPLIFIER INPUT Low Offset

® XTR101 XTR101 Precision, Low Drift 4-20mA TWO-WIRE TRANSMITTER FEATURES APPLICATIONS q INSTRUMENTATION AMPLIFIER INPUT Low Offset Voltage, 30µV max Low Voltage Drift, 0.75µV/°C max Low Nonlinearity, 0.01% max q INDUSTRIAL PROCESS CONTROL Pressure Transmitters Temperature Transmitters Millivolt Transmitters q TRUE TWO-WIRE OPERATION Power and Signal on One Wire Pair Current Mode Signal Transmission High Noise Immunity q RESISTANCE BRIDGE INPUTS q THERMOCOUPLE INPUTS q RTD INPUTS q CURRENT SHUNT (mV) INPUTS q PRECISION DUAL CURRENT SOURCES q DUAL MATCHED CURRENT SOURCES q WIDE SUPPLY RANGE: 11.6V to 40V q 40°C to +85°C SPECIFICATION RANGE q AUTOMATED MANUFACTURING q POWER/PLANT ENERGY SYSTEM MONITORING q SMALL 14-PIN 14-PIN DIP PACKAGE, CERAMIC AND PLASTIC DESCRIPTION The XTR101 XTR101 is a microcircuit, 4-20mA, two-wire transmitter containing a high accuracy instrumentation amplifier (IA), a voltage-controlled output current source, and dual-matched precision current reference. This combination is ideally suited for remote signal conditioning of a wide variety of transducers such as thermocouples, RTDs, thermistors, and strain gauge bridges. State-of-the-art design and laser-trimming, wide temperature range operation and small size make it very suitable for industrial process control applications. In addition, the optional external transistor allows even higher precision. The two-wire transmitter allows signal and power to be supplied on a single wire-pair by modulating the power supply current with the input signal source. The transmitter is immune to voltage drops from long runs and noise from motors, relays, actuators, switches, transformers, and industrial equipment. It can be used by OEMs producing transmitter modules or by data acquisition system manufacturers. IREF1 Optional External Transistor IREF2 10 e1 3 +VCC 11 8 5 (1) 12 XTR101 XTR101 Span B 6 e2 4 + (1) 13 1 2 14 7 9 E IOUT Optional Offset Null NOTE: (1) Pins 12 and 13 are used for optional BW control. International Airport Industrial Park · Mailing Address: PO Box 11400, Tucson, AZ 85734 · Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 · Tel: (520) 746-1111 · Twx: 910-952-1111 Internet: http://www.burr-brown.com/ · FAXLine: (800) 548-6133 (US/Canada Only) · Cable: BBRCORP · Telex: 066-6491 · FAX: (520) 889-1510 · Immediate Product Info: (800) 548-6132 © 1986 Burr-Brown Corporation PDS-627G PDS-627G Printed in U.S.A. October, 1993 SPECIFICATIONS ELECTRICAL At TA = +25°C, +VCC = 24VDC 24VDC, and RL = 100 with external transistor connected, unless otherwise noted XTR101AG XTR101AG PARAMETER CONDITIONS MIN TYP XTR101BG XTR101BG MAX MIN 20 22 38 ±10 ±20 ±40 ±40 TYP T T XTR101AP XTR101AP MAX MIN T T T ±6 ±15 ±30 T TYP T T XTR101AU XTR101AU MAX MIN T T T ±19 ±20 ±60 T TYP T T MAX UNITS T T T ±19 ±60 T mA mA mA µA ppm, FS/°C µA VDC T T OUTPUT AND LOAD CHARACTERISTICS Current Linear Operating Region Derated Performance Current Limit Offset Current Error vs Temperature Full Scale Output Current Error Power Supply Voltage Load Resistance SPAN Output Current Equation Span Equation vs Temperature Untrimmed Error(2) Nonlinearity Hysteresis Dead Band INPUT CHARACTERISTICS Impedance: Differential Common-Mode Voltage Range, Full Scale Offset Voltage vs Temperature Power Supply Rejection Bias Current vs Temperature Offset Current vs Temperature Common-Mode Rejection(4) Common-Mode Range CURRENT SOURCES Magnitude Accuracy 4 3.8 IOS, IO = 4mA IOS /T Full Scale = 20mA VCC, Pins 7 and 8, +11.6 Compliance(1) At VCC = +24V, IO = 20mA At VCC = +40V, IO = 20mA RS in , e1 and e2 in V RS in Excluding TCR of RS SPAN NONLINEARITY 5 28 ±3.9 ±10.5 ±20 T ±2.5 ±8 ±15 T ±100 0 0.01 T 0 0 0 110 90 ±30 ±0.75 125 60 0.30 10 0.1 100 4 T 150 1 ±30 0.3 T vs Temperature vs VCC vs Time Compliance Voltage Ratio Match Accuracy vs Tempeature vs VCC vs Time Output Impedance With Respect to Pin 7 Tracking (1 IREF1/IREF2) X 100% ±0.06 ±50 ±3 ±8 0 10 TEMPERATURE RANGE Specification Operating Storage 40 55 55 ±0.17 ±80 ±10 ±1 20 T ±30 ±0.75 T T T T ±20 T T T ±0.025 ±30 T T T ±0.06 ±15 T T T T +85 +125 +165 T T T T T T 122 T T T T T T ±0.075 ±50 T ±0.04 10 T ±100 T T 110 T T T T T T T T T T T T 40 40 55 T T 122 T T T T T T T ±100 T T T T T T T ±0.37 T T ±0.031 T T T T T T ±0.2 T T T T T T T T T ±0.009 T T T T VCC 3.5 ±0.014 ±20 ±0.35 T T T T T T T 6 1 VCC = 24V, VPIN 8 V PIN 10, 11 = 19V R2 = 5k, Fig. 5 iO = 4mA + [0.016 + (40/RS 40/RS)] (e2 e1) S = [0.016 + (40/RS 40/RS)] T T T T T T T T T T T T T 1 ±60 ±1.5 31 ±8.5 T ±30 600 1400 T T 0.4 || 3 10 || 3 e = (e2 e1)(3) VOS VOS/T VCC/PSRR = VOS Error IB IB/T IOSI IOSI/T DC e1 and e2 with Respect to Pin 7 T T T 600 1400 ±30 2.5 31 ±8.5 ±10.5 ±30 ±0.2 T T T T ±0.088 T T T 15 T +85 +85 +125 T 40 55 G || pF G || pF V µV µV/°C dB nA nA/°C nA nA/°C dB V mA ±0.37 T T ±0.031 A/V ppm/°C % % % % % ppm/°C ppm/V ppm/month V ±0.088 T % ppm/°C ppm/V ppm/month M T +85 +125 °C °C °C T T 15 T Same as XTR101AG XTR101AG. NOTES: (1) See Typical Performance Curves. (2) Span error shown is untrimmed and may be adjusted to zero. (3) e1 and e2 are signals on the In and +In terminals with respect to the output, pin 7. While the maximum permissible e is 1V, it is primarily intended for much lower input signal levels, e.g., 10mV or 50mV full scale for the XTR101A XTR101A and XTR101B XTR101B grades respectively. 2mV FS is also possible with the B grade, but accuracy will degrade due to possible errors in the low value span resistance and very high amplification of offset, drift, and noise. (4) Offset voltage is trimmed with the application of a 5V common-mode voltage. Thus the associated common-mode error is removed. See Application Information section. The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. ® XTR101 XTR101 2 PIN CONFIGURATION Top View DIP Zero Adjust 1 14 Top View Zero Adjust 2 13 In 3 12 B Control 16 Zero Adjust 2 15 Bandwidth In Bandwidth 1 Zero Adjust Zero Adjust Zero Adjust SOIC 3 14 B Control 13 IREF2 SOL-16 SOL-16 Surface-Mount 4 Span 5 Span Out DIP 10 Span IREF1 6 9 7 8 E +VCC Power Supply, +VCC . 40V Input Voltage, e1 or e2 . VOUT, +VCC Storage Temperature Range, Ceramic . 55°C to +165°C Plastic . 55°C to +125°C Lead Temperature (soldering 10s) G, P . +300°C (wave soldering, 3s) U . +260°C Output Short-Circuit Duration . Continuous +VCC to IOUT Junction Temperature . +165°C PACKAGE XTR101AG XTR101AG XTR101BG XTR101BG XTR101AP XTR101AP XTR101AU XTR101AU 14-Pin Ceramic DIP 14-Pin Ceramic DIP 14-Pin Plastic DIP 16-Lead SOIC 169 169 010 211 to to to to 11 E 7 10 +VCC 8 9 NC ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. TEMPERATURE RANGE 40°C 40°C 40°C 40°C IREF1 This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. PACKAGE/ORDERING INFORMATION PRODUCT 12 6 ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS PACKAGE DRAWING NUMBER(1) 5 Out IREF2 4 Span 11 +In NC +In +85°C +85°C +85°C +85°C NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. ® 3 XTR101 XTR101 TYPICAL PERFORMANCE CURVES At TA = +25°C, +VCC = 24VDC 24VDC, unless otherwise noted. SPAN vs FREQUENCY STEP RESPONSE 25 CC = 0 RS = 25 RS = 20 60 Output Current (mA) Transconductance (20 Log m ) 80 RS = 100 RS = 400 40 RS = 2k RS = 20 RS = 25 15 10 5 0 0 100 1k 10k 100k 1M 0 200 400 Frequency (Hz) 600 800 1000 Time (µs) FULL SCALE INPUT VOLTAGE vs RS RS (k) 0 2 4 6 8 COMMON-MODE REJECTION vs FREQUENCY 0.08 0.8 0.06 0.6 120 0.04 0.4 0.02 80 CMR (dB) 0 to 800mV and 0 to 8k scale eIN Full Scale (V) eIN Full Scale (V) 100 0.2 40 20 0 to 80mV (low level signals) and 0 to 400 scale 0 0 0 100 200 60 300 0 400 0.1 1 10 RS () POWER SUPPLY REJECTION vs FREQUENCY 1k 10k 100k BANDWIDTH vs PHASE COMPENSATION 140 100k 120 10k 100 Bandwidth (Hz) Power Supply Rejection (dB) 100 Frequency (Hz) 80 60 40 RS = 1k RS = 400 RS = 100 100 RS = 25 10 1 20 0 0.1 10 0.1 100 1k 10k 100k 1M 10M 1 ® XTR101 XTR101 10 100 1k 10k Bandwidth Control, CC (pF) Frequency (Hz) 4 100k 1M TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, +VCC = 24VDC 24VDC, unless otherwise noted. INPUT CURRENT NOISE DENSITY vs FREQUENCY INPUT VOLTAGE NOISE DENSITY vs FREQUENCY 6 Input Noise Current (pA/ Hz ) Input Noise Voltage (nV/ Hz ) 60 50 40 30 20 10 0 5 4 3 2 1 0 1 10 100 1k 10k 100k 1 10 100 1k 10k 100k Frequency (Hz) Frequency (Hz) OUTPUT CURRENT NOISE DENSITY vs FREQUENCY Output Noise Current (nA/ Hz ) 6 5 4 3 2 1 0 1 10 100 1k 10k 100k Frequency (Hz) THEORY OF OPERATION since IO is unipolar e2 must be kept larger than e1; i.e., e2 e1 or eIN 0. Also note that in order not to exceed the output upper range limit of 20mA, eIN must be kept less than 1V when RS = and proportionately less as RS is reduced. A simplified schematic of the XTR101 XTR101 is shown in Figure 1. Basically the amplifiers, A1 and A2, act as a single power supply instrumentation amplifier controlling a current source, A3 and Q1. Operation is determined by an internal feedback loop. e1 applied to pin 3 will also appear at pin 5 and similarly e2 will appear at pin 6. Therefore the current in RS, the span setting resistor, will be IS = (e2 e1)/RS = eIN/RS. This current combines with the current, I3, to form I1. The circuit is configured such that I2 is 19 times I1. From this point the derivation of the transfer function is straightforward but lengthy. The result is shown in Figure 1. INSTALLATION AND OPERATING INSTRUCTIONS BASIC CONNECTION The basic connection of the XTR101 XTR101 is shown in Figure 1. A difference voltage applied between input pins 3 and 4 will cause a current of 4-20mA to circulate in the two-wire output loop (through RL, VPS, and D1). For applications requiring moderate accuracy, the XTR101 XTR101 operates very cost-effectively with just its internal drive transistor. For more demanding applications (high accuracy in high gain) an external NPN transistor can be added in parallel with the internal one. This keeps the heat out of the XTR101 XTR101 package Examination of the transfer function shows that IO has a lower range-limit of 4mA when eIN = e2 e1 = 0V. This 4mA is composed of 2mA quiescent current exiting pin 7 plus 2mA from the current sources. The upper range limit of IO is set to 20mA by the proper selection of RS based on the upper range limit of eIN. Specifically RS is chosen for a 16mA output current span for the given full scale input voltage span; i.e., (0.016 + 40/RS 40/RS)(eIN full scale) = 16mA. Note that ® 5 XTR101 XTR101 eIN + RS (e1) IS 5 6 I3 I4 R3 1.25k (e1) IB1 +VCC R4 1.25k A1 In3 eIN (e2) +VCC A2 +VCC 8 D1 IB2 VPS +In4 (e2) 100µA 7 IO + eL Q1 +VCC +VCC I1 R1 1k 2mA RL A3 R2 52.6 I2 IO Voltage Controlled Current Source 11 I REF2 IO = 4mA + (0.016 2.5k 10 IREF1 + 40/RS 40/RS) eIN, eIN = e2 e1 FIGURE 1. Simplified Schematic of the XTR101 XTR101. and minimizes thermal feedback to the input stage. Also in such applications where eIN full scale is small (