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ED300-2 Datasheet(PDF) 10 Page - Texas Instruments

Part # ED300-2
Description  LOG114EVM User Guide
Download  21 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ED300-2 Datasheet(HTML) 10 Page - Texas Instruments

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+ 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
·
· 0.3 V/V + 2 V
( (
(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
www.ti.com
In the case where I
1 = 500 nA = IREF, the VLOGOUT terminal is equal to the level shifting bias voltage of 2 V
and the V
OUT terminal is equal to 1.5 V. The circuit in Figure 10, while convenient for creating an input
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
1 (I1 = VIN/R) and results in a
change for the V
LOGOUT terminal voltage according to Equation 5.
(5)
For input currents less than 1 mA, this equation simplifies to Equation 2.
The voltage at the V
LOG terminal is given by Equation 6:
(6)
The voltage at the V
ERR terminal is given by Equation 7:
(7)
The voltage at the V
OUT terminal is given by Equation 8:
(8)
10
LOG114EVM User Guide
SBOU110
– September 2011
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Copyright
© 2011, Texas Instruments Incorporated


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