OPA132 Datasheet, PDF (12/30 Pages) Burr-Brown (TI) – High Speed FET-INPUT OPERATIONAL AMPLIFIERS

OPA132, OPA2132, OPA4132
SBOS054B – JANUARY 1995 – REVISED SEPTEMBER 2015
www.ti.com
Application Information (continued)
The dual and quad versions have higher total power dissipation than the single, leading to higher junction
temperature. Thus, a warmed-up quad will have higher input bias current than a warmed-up single. Furthermore,
an SOIC will generally have higher junction temperature than a DIP at the same ambient temperature because of
a larger θ_JA.
Printed-circuit-board layout can also help minimize junction temperature rise. Temperature rise can be minimized
by soldering the devices to the circuit board rather than using a socket. Wide copper traces will also help
dissipate the heat by acting as an additional heat sink.
Input stage cascode circuitry assures that the input bias current remains virtually unchanged throughout the full
input common-mode range of the OPAx132 series. See Figure 6.
8.2 Typical Application
The OPAx132 family offers outstanding dc precision and ac performance. These devices operate up to 36-V
supply rails and offer ultralow input bias current and input bias current noise, as well as 8-MHz bandwidth and
high capacitive load drive. These features make the OPAx132 a robust, high-performance operational amplifier
for high-voltage industrial applications with high source impedance.
2.94 k
Input
590
499
39 nF
1 nF
±
+
Output
Figure 19. OPA132 2nd Order 30 kHz, Low Pass Filter Schematic
8.2.1 Design Requirements
Use the following parameters for this application:
• Gain = 5 V/V
• Low pass cutoff frequency = 30 kHz
• -40 db/dec filter response
• Maintain less than 3-dB gain peaking in the gain versus frequency response
8.2.2 Detailed Design Procedure
WEBENCH® Filter Designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH
Filter Designer lets you create optimized filter designs using a selection of TI operational amplifiers and passive
components from TI's vendor partners.
Available as a web based tool from the WEBENCH® Design Center, WEBENCH® Filter Designer allows you to
design, optimize, and simulate complete multistage active filter solutions within minutes.
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