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參數(shù)資料
| 型號： | OPA655 |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| 中文描述： | 寬帶，單位增益穩(wěn)定，F(xiàn)ET輸入運(yùn)算放大器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 222K |
| 代理商： | OPA655 |
OPA655
8
DISCUSSION OF
PERFORMANCE
Amplifiers using FET input transistors operate in a similar
manner to those using bipolar transistors, with some impor-
tant advantages. In standard op amp applications, the very
low input bias currents reduce the DC error voltage due to
a high or possibly unknown source impedance. In most
OPA655 applications, the output DC error will be due only
to the low 1mV input offset voltage. Similarly, input noise
currents will contribute very little to the total output noise in
most applications. Wideband transimpedance applications
(e.g., photodiode amplifiers) will particularly benefit from
the low current noise combined with the OPA655’s very low
6nV/
√
Hz input voltage noise.
The OPA655’s high gain bandwidth and very linear output
stage hold the harmonic distortion below –90dBc through
5MHz for a 2Vp-p swing into 100
. Significantly less
distortion is observed at lower frequencies and/or higher
load impedance. The voltage feedback architecture supports
this level of accuracy with greater than 65dB power supply
and common mode rejection ratios. This very high dynamic
range, along with the low DC errors and noise of the FET
input stage, can provide an exceptional buffering capability
for ADC’s, PMT’s and other applications requiring high
impedance sensing of a high speed signal. For similar
distortion performance with a bipolar input stage, refer to the
OPA642.
OPERATING CONSIDERATIONS
Careful attention to PC board layout will deliver the excep-
tional performance shown in the Typical Performance Curves.
Generally, very low impedance paths to the power supplies,
along with low parasitic connections to the signal I/O pins
are required for best performance (See Layout and Intercon-
nect Considerations). Use of a guard ring around the non-
inverting input can reduce the leakage current due to com-
mon mode input signals. However, driving the guard from
the inverting node, can increase the differential input capaci-
tance, possibly leading to instability or increased broadband
noise. Non-inverting buffer applications require a very low
inductance short to be connected between the output and
inverting input to minimize peaking in the frequency re-
sponse. Use a wide trace (0.1") directly between the output
and inverting input pins on the component side of the board
for this connection.
The OPA655 is nominally designed to operate from
±
5V
supplies. The maximum voltage between the supply pins
should be limited to less than 11V. Since a supply indepen-
dent bias is used, very little change in AC performance is
observed as the supply voltage is changed.
BASIC OP AMP CONNECTIONS
Figures 2 through 4 illustrate the basic op amp connections
suitable for the OPA655. The non-inverting buffer (voltage
follower) application (Figure 2) will benefit from the very
FIGURE 1. Simplified Internal Schematic.
Current
Mirror
Supply
Independent
Bias
Output
Stage
C
C
6
+In
3
2
–In
+V
S1
Output
–V
S2
+V
S2
–V
S1
4
7
8
5
5
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA655P | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA655U | Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA671AP | Wide Bandwidth, Fast Settling Difet OPERATIONAL AMPLIFIER |
| OPA671 | Wide Bandwidth, Fast Settling Difet OPERATIONAL AMPLIFIER |
| OPA683ID | OP-AMP|SINGLE|BIPOLAR|SOP|8PIN|PLASTIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA655P | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Unity Gain Stable, FET-Input OPERATIONAL AMPLIFIER |
| OPA655P | 制造商:Texas Instruments 功能描述:OP AMP WIDEBAND FET IP DIP8 655 |
| OPA655U | 功能描述:IC OPAMP VFB 240MHZ SGL WB 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品變化通告:Discontinuation 18/May/2012 標(biāo)準(zhǔn)包裝:2,000 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.42 V/µs 增益帶寬積:1.5MHz -3db帶寬:- 電流 - 輸入偏壓:15nA 電壓 - 輸入偏移:1000µV 電流 - 電源:116µA 電流 - 輸出 / 通道:100mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5 V，±0.9 V ~ 2.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:851 (CN2011-ZH PDF) 其它名稱:296-20930-2 |
| OPA656 | 制造商:BB 制造商全稱:BB 功能描述:Precision, High-Speed Transimpedance Amplifier |
| OPA656-DIE | 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDEBAND, UNITY-GAIN STABLE, FET-INPUT OPERATIONAL AMPLIFIER |
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