參數(shù)資料
型號(hào)： OPA354AQDBVRQ1
廠商： Texas Instruments
文件頁(yè)數(shù)： 5/24頁(yè)
文件大?。?/td> 0K
描述： IC OPAMP RRIO 250MHZ SOT23-5
標(biāo)準(zhǔn)包裝： 1
放大器類型： 電壓反饋
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 150 V/µs
增益帶寬積： 100MHz
-3db帶寬： 250MHz
電流 - 輸入偏壓： 3pA
電壓 - 輸入偏移： 2000µV
電流 - 電源： 4.9mA
電流 - 輸出 / 通道： 100mA
電壓 - 電源，單路/雙路(±)： 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： SC-74A，SOT-753
供應(yīng)商設(shè)備封裝： SOT-23-5
包裝： 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面： 854 (CN2011-ZH PDF)
其它名稱： 296-24618-6
ADS7816, ADS7861,
or ADS7864
12Bit A/D Converter
OPA354
+5V
V
IN
V+
+In
In
V
REF
GND
NOTE: A/D Converter Input = 0V to V
REF
+2.5V
5k
5k
330pF
V
IN = 0V to 5V for 0V to 5V output.
OPA354
V+
V
IN
V
OUT
C
L
R
L
R
S
OPA354-Q1
OPA2354-Q1
www.ti.com ....................................................................................................................................................... SBOS492A – JUNE 2009 – REVISED AUGUST 2009
Driving Analog-to-Digital Converters
The OPA354 series op amps offer 60-ns settling time to 0.01%, making them a good choice for driving high- and
medium-speed sampling A/D converters and reference circuits. The OPA354 series provide an effective means
of buffering the A/D converter's input capacitance and resulting charge injection while providing signal gain. For
applications requiring high DC accuracy, the OPA350 series is recommended.
Figure 6 shows the OPA354 driving an A/D converter. With the OPA354 in an inverting configuration, a capacitor
across the feedback resistor can be used to filter high-frequency noise in the signal.
Figure 6. OPA354 Inverting Configuration Driving the ADS7816
Capacitive Load and Stability
The OPA354 series op amps can drive a wide range of capacitive loads. However, all op amps under certain
conditions may become unstable. Op amp configuration, gain, and load value are just a few of the factors to
consider when determining stability. An op amp in unity-gain configuration is most susceptible to the effects of
capacitive loading. The capacitive load reacts with the op amp's output resistance, along with any additional load
resistance, to create a pole in the small-signal response that degrades the phase margin. See the typical
characteristic curve Frequency Response vs Capacitive Load for details.
The OPA354's topology enhances its ability to drive capacitive loads. In unity gain, these op amps perform well
with large capacitive loads. Refer to the typical characteristic curve Recommended RS vs Capacitive Load and
Frequency Response vs Capacitive Load for details.
One method of improving capacitive load drive in the unity-gain configuration is to insert a 10-
to 20- resistor
in series with the output, as shown in Figure 7. This significantly reduces ringing with large capacitive loads—see
the typical characteristic curve Frequency Response vs Capacitive Load. However, if there is a resistive load in
parallel with the capacitive load, RS creates a voltage divider. This introduces a DC error at the output and
slightly reduces output swing. This error may be insignificant. For instance, with RL = 10 k and RS = 20 , there
is only about a 0.2% error at the output.
Figure 7. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive
Copyright 2009, Texas Instruments Incorporated
13
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OPA355NA/3K 功能描述:高速運(yùn)算放大器 2.5V 200MHz GBW CMOS Sngl RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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