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OPA830 bảng dữ liệu(PDF) 32 Page - Texas Instruments

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tên linh kiện OPA830
Giải thích chi tiết về linh kiện  OPA838 1mA, 300MHz Gain Bandwidth, Voltage-Feedback Op Amp
PDF  56 Pages
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Trang chủ  http://www.ti.com
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OPA830 bảng dữ liệu(HTML) 32 Page - Texas Instruments

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elements in half and add a low-impedance path, such as a capacitor or a DC reference, between the two RG
values.
+
±
+
±
Vindiff
OPA838
OPA838
PD
PD
R1 500 Ÿ
R2 500 Ÿ
VCM
RF 3.57 NŸ
RF 3.57 NŸ
RG1 88.7 Ÿ
RG1 88.7 Ÿ
CCM
10nF
VCC
VCC
Vodiff
High Gain
Differential
I/O
VEE
VEE
Figure 8-4. High-Gain Differential I/O Stage
Integrated results are available, but the OPA838 provides a low-power, high-frequency result. For best CMRR
performance, match the resistors. A good rule is CMRR is approximately equal to the resistor tolerance;
therefore, a 0.1% tolerance provides approximately 60-dB CMRR.
8.2.1.1 Design Requirements
As an example design, start with the circuit in Figure 8-4.
• Set the target gain and split the RG element in half. For this example, target a gain of 41 V/V.
• Assess the DC common-mode biasing on the noninverting inputs. The DC biasing must be in range and have
a gain of 1 to the output. This is not illustrated in Figure 8-3.
• If a DC reference is used as the mid-R G bias, setting the reference equal to the noninverting input
bias voltage sets the output common-mode to that voltage. Using a capacitor as illustrated in Figure 8-3
accomplishes the same results.
OPA838
SBOS867D – AUGUST 2017 – REVISED SEPTEMBER 2024
www.ti.com
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Product Folder Links: OPA838



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