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ISO100 Datasheet(PDF) 10 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # ISO100
Description  Optically-Coupled Linear ISOLATION AMPLIFIER
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ISO100 Datasheet(HTML) 10 Page - Burr-Brown (TI)

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10
ISO100
Example 4.
Given: Total error RTO from Examples 1 and 3 as 378mV
worst case.
Find: Percent error of +10V full scale output
% Error =
x 100%
=
x 100%
= 3.78%
NOISE ERRORS
Noise errors in the unipolar mode are due primarily to the
optical cavity. When the full 60kHz bandwidth is not needed,
the output noise of the ISO100 can be limited by either a
capacitor, C
F, in the feedback loop or by a low-pass filter
following the output. This is shown in Figure 4. Noise in the
bipolar mode is due primarily to the reference current
sources, and can be reduced by the low-pass filters shown in
Figure 5.
V
ERR TOTAL
V
FS
OPTIONAL ADJUSTMENTS
There are two major sources of offset error: offset volt-
age and offset current. VOSI and VOSO of the input and output
amplifiers can be adjusted independently using external
potentiometers. An example is shown in Figure 17. Note that
VOSO (500µV, max) appears directly at the output, but VOSI
appears at the output multiplied by gain (RF/RIN). In general,
VOS is small compared to the effect of IOS (see Example 1).
To adjust for IOS use a circuit which intentionally unbalances
the offset in one direction and then allows for adjustment
back to zero.
Figure 6 shows how to adjust unipolar errors at zero input.
The unipolar amplifier can be used down to zero input if it
is made to be “slightly bipolar.” By sampling the reference
current with R
5 and R6, the minimum current required to
keep the input stage in the linear region of operation can be
established. R
7 and R8 are adjusted to cancel the offset
created in the input stage. This brings the output to zero,
when the input is zero. Although the amplifier can now
operate down to zero input voltage, it has only a small
portion of the current drain and noise that the true bipolar
configuration would have.
Adjusting the bipolar errors is illustrated in Figure 7. Each
of the errors are adjusted in turn. With VIN = “open,”, IOS is
trimmed by adjusting R
10 to make the output zero. RG is then
adjusted to trim the gain error. The effects of offset voltage
are removed by adjusting R
14.
FIGURE 4. Two Circuit Techniques for Reducing Noise in
the Unipolar Mode.
FIGURE 5. Circuit Techniques for Reducing Noise from the
Current Sources in the Bipolar Mode.
FIGURE 6. Adjusting the Unipolar Amplifier Errors at Zero
Input.
378mV
10V
R
I
IN
R
F
C
C
F
7
9
15
17
ISO100
3
18
f
O =
1
2
πRC
f
O =
1
2
πR
FCF
I
IN
7
9
15
17
ISO100
3
18
100k
16
1µF
1M
R
F
8
100k
1µF
V
OUT
R
F
1M
V
OUT
Optional Unipolar I
OS Adjust.
I
C2
R
6
84k
+In
–In
18
λ
R
7
10M
R
8
200k
Ω Pot
I
REF 2
I
REF 1
I
C1
I
IN
R
5
10M
V
OUT
I
IN
I
C2 (MAX)
I
C2 (MIN)
Shift due
to R
7 and R8.
Shift due to R
5 and R6.
ISO100


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