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OPA2832 Datasheet(PDF) 22 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # OPA2832
Description  Dual, Low-Power, High-Speed, Fixed-Gain Operational Amplifier
PDF  37 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

OPA2832 Datasheet(HTML) 22 Page - National Semiconductor (TI)

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OPA2832
400
Ω
2k
Ω
400
Ω
+5V
3k
Ω
2V
I
V
I
300pF
0.1
µF
1MHz, 2nd−Order
Butterworth Filter
470pF
866
Ω
205
Ω
0.1
µF
DIFFERENTIAL LOW-PASS FILTERS
506
Ω
0.1
µF
506
Ω
238
Ω
5k
Ω
5k
Ω
238
Ω
0.1
µF
V
I
238
Ω
238
Ω
BUF602
150pF
150pF
100pF
100pF
0.1
µF
+5V
2.5V
V
O
V
I
+5V
1 /2
O P A 2 8 3 2
1 / 2
O P A 2 8 3 2
400
Ω
400
Ω
400
Ω
400
Ω
OPA2832
SBOS327C – FEBRUARY 2005 – REVISED AUGUST 2008 ............................................................................................................................................. www.ti.com
Figure 66. Single-Supply, High-Frequency Active Filter
The dual OPA2832
offers
an
easy
means
to
implement low-power differential active filters. On a
single supply, one way to implement a 2nd-order,
low-pass filter is shown in Figure 67. This circuit
provides a net differential gain of 1 with a precise
5MHz
Butterworth
response.
The
signal
is
AC-coupled
(giving
a
high-pass
pole
at
low
frequencies) with the DC operating point for the
circuit set by the unity-gain buffer—the BUF602. This
buffer gives a very low output impedance to high
frequencies to maintain accurate filter characteristics.
If the source is a DC-coupled signal already biased
into the operating range of the OPA2832 input CMR,
these capacitors and the midpoint bias may be
removed. To get the desired 5MHz cutoff, the input
resistors to the filter is actually 119
Ω. This is
implemented in Figure 67 as the parallel combination
of the two 238
Ω resistors on each half of the
Figure 67. Single-Supply, 5MHz, 2nd-Order,
differential input as part of the DC biasing network. If
Low-Pass Sallen-Key Filter
the BUF602 is removed, these resistors should be
collapsed back to a single 119
Ω input resistor.
22
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Copyright © 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): OPA2832



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