+ VIN

I

I

2

1

V

=

LOGOUT

0.375 LOG

10

·

+ 2 V + I 50

1

W

·

( (

I

I

2

1

V

= [

LOG

0.375 LOG

10

·

+ I 50

]

1

W

·

( (

(I 3)

1 k

1

W

·

2

21.5 kW

+

5 kW

·

V

= 2 +

ERR

V

= 2 V

V

OUT

LOG

ERR

-

·

Connecting to the LOG114EVM

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In the case where I

and the V

current, does not take advantage of the high-current linearity correction circuitry. To use this circuitry, a

second power supply must be used and configured as shown in Figure 11.

Figure 11. Using a Resistor and the High Current Linearity Correction Circuitry

Changing the input voltage or the resistor value changes the input current I

change for the V

(5)

For input currents less than 1 mA, this equation simplifies to Equation 2.

The voltage at the V

(6)

The voltage at the V

(7)

The voltage at the V

(8)

10

LOG114EVM User Guide

SBOU110

– September 2011

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© 2011, Texas Instruments Incorporated