XTR106UA datasheet(9/22 Pages) TI1

Part #	XTR106UA

Description	4-20mA CURRENT TRANSMITTER with Bridge Excitation and Linearization

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XTR106

9

SBOS092A

www.ti.com

APPLICATIONS INFORMATION

Figure 1 shows the basic connection diagram for the XTR106.

The loop power supply, VPS, provides power for all circuitry.

Output loop current is measured as a voltage across the series

load resistor, RL. A 0.01µF to 0.03µF supply bypass capacitor

connected between V+ and IO is recommended. For applica-

tions where fault and/or overload conditions might saturate

the inputs, a 0.03

µF capacitor is recommended.

A 2.5V or 5V reference is available to excite a bridge sensor.

For 5V excitation, pin 14 (VREF5) should be connected to the

bridge as shown in Figure 1. For 2.5V excitation, connect

pin 13 (VREF2.5) to pin 14 as shown in Figure 3b. The output

terminals of the bridge are connected to the instrumentation

amplifier inputs, VIN and VIN. A 0.01µF capacitor is shown

connected between the inputs and is recommended for high

impedance bridges (> 10k

Ω). The resistor R

G sets the gain

of the instrumentation amplifier as required by the full-scale

bridge voltage, VFS.

Lin Polarity and RLIN provide second-order linearization

correction to the bridge, achieving up to a 20:1 improvement

in linearity. Connections to Lin Polarity (pin 12) determine

the polarity of nonlinearity correction and should be con-

nected either to IRET or VREG. Lin Polarity should be con-

nected to VREG even if linearity correction is not desired.

RLIN is chosen according to the equation in Figure 1 and is

dependent on KLIN (linearization constant) and the bridge’s

nonlinearity relative to VFS (see “Linearization” section).

The transfer function for the complete current transmitter is:

IO = 4mA + VIN • (40/RG)(1)

VIN in Volts, RG in Ohms

where VIN is the differential input voltage. As evident from

the transfer function, if no RG is used (RG = ∞), the gain is

zero and the output is simply the XTR106’s zero current.

A negative input voltage, VIN, will cause the output current

to be less than 4mA. Increasingly negative VIN will cause the

output current to limit at approximately 1.6mA. If current is

being sourced from the reference and/or VREG, the current

limit value may increase. Refer to the Typical Performance

Curves, “Under-Scale Current vs IREF + IREG” and “Under-

Scale Current vs Temperature.”

Increasingly positive input voltage (greater than the full-

scale input, VFS) will produce increasing output current

according to the transfer function, up to the output current

limit of approximately 28mA. Refer to the Typical Perfor-

mance Curve, “Over-Scale Current vs Temperature.”

The IRET pin is the return path for all current from the

references and VREG. IRET also serves as a local ground and

is the reference point for VREG and the on-board voltage

references. The IRET pin allows any current used in external

circuitry to be sensed by the XTR106 and to be included in

the output current without causing error. The input voltage

range of the XTR106 is referred to this pin.

FIGURE 1. Basic Bridge Measurement Circuit with Linearization.

+–

11

1

14

5

5V

Bridge

Sensor

4

3

2

R

G

XTR106

7

13

I = 4mA + V

IN • (

)

O

40

R

G

R

LIN

(3)

V

REG

V

REF2.5

6

or

(4)

R

2

(5)

R

1

(5)

R

B

R

G

R

G

V

IN

–

V

IN

+

R

LIN

V

REG

V+

I

RET

Lin(1)

Polarity

I

O

E

B

V

PS

4-20 mA

I

O

C

OUT

0.01

µF

C

IN

0.01

µF(2)

7.5V to 36V

–

+

9

8

10

12

R

L

V

O

Q

1

V

REF5

For 2.5V excitation, connect

pin 13 to pin 14

Possible choices for Q

1 (see text).

V

REG

(1)

+

–

NOTES:

(1) Connect Lin Polarity (pin 12) to I

RET (pin 6) to correct for positive

bridge nonlinearity or connect to V

REG (pin 1) for negative bridge

nonlinearity. The R

LIN pin and Lin Polarity pin must be connected to

V

REG if linearity correction is not desired. Refer to “Linearization”

section and Figure 3.

R

G = (VFS/400µA) •

(4)

(2) Recommended for bridge impedances > 10k

Ω

(5) R

1 and R2 form bridge trim circuit to compensate for the initial

accuracy of the bridge. See “Bridge Balance” text.

R

LIN = KLIN •

where K

LIN = 9.905kΩ for 2.5V reference

K

LIN = 6.645kΩ for 5V reference

B is the bridge nonlinearity relative to V

FS

V

FS is the full-scale input voltage

4B

1 – 2B

( 3)

(K

LIN in Ω)

(V

FS in V)

1 + 2B

1 – 2B

2N4922

TIP29C

TIP31C

TYPE

TO-225

TO-220

PACKAGE

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