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OPA354-Q1_15 Datasheet, PDF (18/36 Pages) Texas Instruments – OPAx354-Q1 250-MHz, Rail-to-Rail I/O, CMOS Operational Amplifiers
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OPA354-Q1, OPA2354-Q1, OPA4354-Q1
SBOS492B – JUNE 2009 – REVISED DECEMBER 2014
8 Application and Implementation
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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.
8.1 Application Information
The OPAx354-Q1 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-Q1 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.
8.2 Typical Applications
8.2.1 Transimpedance Amplifier
Wide gain bandwidth, low input bias current, low input voltage, and current noise make the OPAx354-Q1 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
(C(D)), which should include the parasitic input common-mode and differential-mode input capacitance (4 pF + 5
pF); the desired transimpedance gain (R(FB)); and the gain-bandwidth (GBW) for the OPAx354-Q1 family of
devices (20 MHz). With these three variables set, the feedback capacitor value (C(FB)) can be set to control the
frequency response. C(FB) includes the stray capacitance of R(FB), which is 0.2 pF for a typical surface-mount
resistor.
(1)
C(F)
< 1 pF
R(F)
10 MΩ
V(V+)
l
C(D)
OPA354-Q1
VO
V(V–)
(1) C(FB) is optional to prevent gain peaking. C(FB) includes the stray capacitance of R(FB).
Figure 37. Dual-Supply Transimpedance Amplifier
8.2.1.1 Design Requirements
PARAMETER
Supply voltage V(V+)
Supply voltage V(V–)
VALUE
2.5 V
–2.5 V
18
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