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EI1040 Dual Instrumentation Amplifier

General purpose dual instrumentation amplifier. Often used in conjunction with the LabJack U12 to provide analog input gain. Operates from a single 5 volt supply and provides a ±15 volt supply and a 4.096 volt reference voltage. Analog input range is ±10 volts. The gain of each channel is set to 1, 10, 100, or 1000 via digital I/O or jumper wires.


Details

Details

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.

The EI-1040 is a common accessory for the LabJack U12.  For the U3 or UE9 the LJTick-InAmp is more commonly used.  The U6/T7 have an in-amp built-in, but if an external in-amp is needed the LJTick-InAmp is usually the best choice.

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 Terminal Terminal
  GSA1 or B1 GSA2 or B2
1 0 0
10 1 0
100 0 1
1000 1 1

0 => -15 to +0.8 volts => GND In, GND, or a DIO set to output-low.
1 => +2 to +15 volts => +5V In, VS from LabJack, or a DIO set to output-high.

Example:  To set channel B to a gain of x100, you can jumper GSB1 to GND In and jumper GSB2 to +5V In.

 

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:

* 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://www.ti.com/lit/ds/symlink/pga204.pdf

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

Phone: 303-987-2441

Fax: 303-980-6581

Email: jk@designcircuit.com

Web: www.designcircuit.com


  Product Comparison

U12 U3-LV U3-HV U6 U6-Pro UE9 UE9-Pro T7 T7-Pro
AIN Voltage ±10V 0-2.4V ±10V [1] ±10V ±10V ±5V ±5V ±10V ±10V
Analog Inputs 8 16 16 14 14 14 14 14 14
Effective Resolution [2] 12 bit 12 bit 12 bit 16 bit 22 bit 12 bit 20 bit 16 bit 22 bit
Digital I/O 20 20 16 20 20 23 23 23 23
Logic Level 5V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V 3.3V
Analog Outputs 2 2 2 2 2 2 2 2 2
Counters 1 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 2 Up to 10 Up to 10
USB Yes Yes Yes Yes Yes Yes Yes Yes Yes
LJTick Compatible No Yes Yes Yes Yes Yes Yes Yes Yes
Internal Temp Sensor No Yes Yes Yes Yes Yes
Yes
Yes Yes
Thermocouple Ready [3] No No No Yes Yes No Yes Yes Yes
Ethernet No No No No No Yes Yes Yes Yes
Scripting No No No No No No No Yes Yes
Wireless No No No No No No No No Yes
Real-time Clock No No No No No No No No Yes
[1] Can be configured for -10V to +20V range.
[2] According to actual measured data, see related Noise and Resolution (App Note)
[3] If not thermocouple ready, can purchase an amplifier like the LJTick-InAmp, see related Thermocouples (App Note)