OPA354_16 Datasheet, PDF (21/44 Pages) Texas Instruments – 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifiers

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9 Application and Implementation
OPA354, OPA2354, OPA4354
SBOS233F – MARCH 2002 – REVISED JUNE 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The OPAx354 family of devices is a CMOS, rail-to-rail I/O, high-speed, voltage-feedback operational amplifier
designed for video, high-speed, and other applications. The OPAx354 family of devices is available as a single,
dual, or quad op amp. The amplifier features a 100-MHz gain bandwidth, and 150-V/µs slew rate, but it is unity-
gain stable and can be operated as a 1-V/V voltage follower.
9.2 Typical Application
Wide gain bandwidth, low input bias current, low input voltage, and current noise make the OPAx354 family of
devices an ideal wideband photodiode transimpedance amplifier. Low-voltage noise is important because
photodiode capacitance causes the effective noise gain of the circuit to increase at high frequency. The key
elements to a transimpedance design, as shown in Figure 37, are the expected diode capacitance, which include
the parasitic input common-mode and differential-mode input capacitance; the desired transimpedance gain; and
the gain-bandwidth (GBW) for the OPAx354 family of devices (20 MHz). With these three variables set, the
feedback capacitor value can be set to control the frequency response. Feedback capacitance includes the stray
capacitance of, which is 0.2 pF for a typical surface-mount resistor.
Copyright © 2016, Texas Instruments Incorporated
Figure 37. Dual-Supply Transimpedance Amplifier
9.2.1 Design Requirements
For this design example, use the parameters listed in Table 1 as the input parameters.
Table 1. Design Parameters
PARAMETER
Supply voltage, V_(V+)
Supply voltage, V_(V-)
EXAMPLE VALUE
2.5 V
–2.5 V
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Product Folder Links: OPA354 OPA2354 OPA4354