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OPA2889 データシート(PDF) 21 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部品番号 OPA2889
部品情報  Dual, Low-Power, Wideband, Voltage-Feedback
PDF  38 Pages
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

OPA2889 データシート(HTML) 21 Page - National Semiconductor (TI)

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LOW POWER, DC-COUPLED,
6kW
R
2A
402W
C
1A
129pF
C
2
257pF
C
1B
129pF
R
1A
402W
R
1B
402W
R3A
232W
R3B
232W
50W
6kW
+12V
V
CM
V
CM
V
OUT
V
IN
1000pF
50W
R
2B
402W
1/2
OPA2889
1/2
OPA2889
OPA2889
www.ti.com ....................................................................................................................................................... SBOS373B – JUNE 2007 – REVISED AUGUST 2008
minimize the distortion introduced by the filter. In
SINGLE-TO-DIFFERENTIAL DRIVER FOR
such cases, the gain of the circuit shown on the front
≤100kHz INPUT
page of the data sheet can be increased to keep the
input to the ADS8472 large in order to keep the SNR
In systems where the input is differential (see
of the system high. Note that the gain of the system
front-page figure), the OPA2889 can be used in the
from the positive input to the output of the OPA2889
inverting configuration with an additional dc bias
in such a configuration is a function of the ac signal
applied to its positive input so as to keep the input to
gain. A resistor divider can be used to scale the
the ADS8472 within its rated operating voltage range.
output of the REF3220 or REF3240 to reduce the
The dc bias can be derived from the REF3220 or the
voltage at the dc input to OPA2889 to keep the
REF3240
reference
voltage
ICs.
The
input
voltage at the input of the converter within its rated
configuration shown on the front page of the data
operating range.
sheet is capable of delivering better than 100dB SNR
and –100dBc THD at an input frequency of 200kHz.
In case band-pass filters are used to filter the input,
care should be taken to ensure that the signal swing
at the input of the band-pass filter is small, so as to
Figure 59. Single-Supply, MFB Active Filter, 2MHz LP Butterworth
Copyright © 2007–2008, Texas Instruments Incorporated
Submit Documentation Feedback
21
Product Folder Link(s): OPA2889



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