Datasheet
SLOS310B − DECEMBER 2000 − REVISED SEPTEMBER 2006
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
offset voltage (continued)
The differential nature of the TLV4120 means that both amplifiers must be considered together to calculate the
differential output offset voltage (V
DOO
) (see Figure 24). The V
OO
of amplifier A1 will be inverted by amplifier
A2. This doubles A1’s V
OO
and has A2’s V
OO
added to it, yielding:
V
DOO
+ 2V
IO1
ǒ
1 )
ǒ
R
F
R
S
Ǔ
Ǔ
" I
IB)
500k
ǒ
1 )
ǒ
R
F
R
S
Ǔ
Ǔ
" 2I
IB–
R
F
–2V
IO2
" I
IB)
500k " I
IB–
20k
−
+
−
+
A1
A2
V
DD
I
IB+
I
IB+
I
IB−
V
IO
500 kΩ
V
IO
I
IB−
R
F
R
S
500 kΩ
20 kΩ
20 kΩ
Figure 24. TLV4120 Offset Voltage Model