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DUAL PROGRAMMABLE GAIN INSTRUMENTATION AMPLIFIER



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DUAL PROGRAMMABLE GAIN INSTRUMENTATION AMPLIFIER ONE 5 VOLT SUPPLY REQUIRED DESCRIPTION The EI 1040 is a dual programmable gain instrumentation amplifier with a precision reference output for bridge excitation Gains are digitally selected at values of 1 10 100 and 1000 Four TTL or CMOS compatible address lines individually select the amplifier gains Applications of this device are for signal conditioning and amplification of low level signals such as thermocouples and transducers This device is also used in conditioning signals to be transmitted over a long distance to single ended receivers The EI 1040 requires 5 volts DC at a nominal 0 1 amp An internal DC to DC converter supplies an output of 15 and 15 volts nominal The EI 1040 consists of 2 Burr Brown TI PGA204 amplifiers and one DCP010515DPB DC to DC converter A 4 096 volt reference is provided for connection to a bridge or other device requiring excitation The maximum allowable current draw from this source is 5 ma The EI 1040 can be attached to the LabJack by simply connecting the power and amplifier outputs to the LabJack When connecting the EI 1040 to the LabJack the LabJack should be powered down prior to making the connection After the connection is made then the combination can be powered up The gain of the EI 1040 can be programmed by the LabJack by connecting the gain select inputs GSA1 GSA2 GSB1 and GSB2 to the LabJack digital outputs The configuration for the gain select is shown below GAIN 1 10 100 1000 TERMINAL GSA1 or B1 0 1 0 1 TERMINAL GSA2 or B2 0 0 1 1 Combinations of gain can be selected so that for example one amplifier can have a gain of 10 and the other have a gain of 100 The voltage level of a 0 is typically ground and the level of a 1 is 2 volts above the digital ground see the PG204A spec sheet for exact levels It should be noted that when the EI 1040 LabJack is powered from limited power sources such as notebook computers bus powered hubs etc there may not be enough current to supply both devices A message from the computer should tell the user of this condition A functional block diagram of the EI 1040 is shown below The following table describes the function of the EI 1040 terminals LABEL DESCRIPTION LABEL GND In POWER SOURCE GROUND GND 5 In 5 VOLT FROM POWER SOURCE 15V OUT 5 In SPARE 5 VOLT TERMINAL 15V OUT GSB2 GAIN STATE B2 EXCT GSB1 GAIN STATE B1 B In GSA2 GAIN STATE A2 B In GSA1 GAIN STATE A1 GND B Out B AMPLIFIER OUTPUT A In A Out A AMPLIFIER OUTPUT A In DESCRIPTION SIGNAL GROUND 15 VOLT USER AT 8 ma 15 VOLT USER AT 8 ma 4 096 VOLT FOR EXCITATION B AMP MINUS INPUT B AMP PLUS INPUT SIGNAL GROUND A AMP MINUS INPUT A AMP PLUS INPUT Worst case current availability actual current availability may be greater Current availability is 3 ma max The instrumentation amplifiers used are Texas Instruments Burr Brown PGA204 parts The specifications for these parts can be obtained on Internet at http focus ti com docs prod productfolder jhtml genericPartNumber PGA204 Typical applications for this unit include SIGNAL CONDITIONER THERMOCOUPLE AMPLIFIER STRAIN GAUGE AMPLIFIER DATA ACQUISITION APPLICATIONS SIGNAL FILTER AUDIO AMPLIFIER MICROPHONE AMPLIFIER FOR TECHNICAL SUPPORT CONTACT ELECTRONIC INNOVATIONS CORP 3333 S WADSWORTH BLVD UNIT A104 LAKEWOOD CO 80227 303 987 2441 FAX 303 980 6581 Email jk designcircuit com Web www designcircuit com


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