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AD8013AN

更新时间： 2024-02-08 02:50:41
品牌 Logo 应用领域
亚德诺 - ADI 视频放大器
页数 文件大小 规格书
12页 321K
描述
Single Supply, Low Power, Triple Video Amplifier

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中文翻译

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AD8013AN 数据手册

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AD8013  
T o estimate the –3 dB bandwidth for closed-loop gains of 2 or  
greater, for feedback resistors not listed in the following table,  
the following single pole model for the AD8013 may be used:  
G = –10  
= 150Ω  
R
180  
90  
L
PHASE  
GAIN  
G
V
= ±5V  
S
ACL Ӎ  
1 + SCT (RF + Gn rin )  
V
= +5V  
S
+1  
0
0
where:  
CT = transcapacitance Х 1 pF  
RF = feedback resistor  
–90  
–1  
–2  
–3  
–4  
–5  
–6  
G = ideal closed loop gain  
RF  
RG  
1 +  
Gn =  
= noise gain  
V
= ±5V  
S
V
= +5V  
S
rin = inverting input resistance Х 150 Ω  
ACL = closed loop gain  
T he –3 dB bandwidth is determined from this model as:  
1M  
10M  
100M  
1G  
1
FREQUENCY – Hz  
f3 Ӎ  
2 π CT (RF + Gn rin )  
Figure 27. Closed-Loop Gain and Phase vs. Frequency,  
G = –10, RL = 150 Ω  
T his model will predict –3 dB bandwidth to within about 10%  
to 15% of the correct value when the load is 150 Ω and VS =  
±5 V. For lower supply voltages there will be a slight decrease in  
bandwidth. T he model is not accurate enough to predict either  
the phase behavior or the frequency response peaking of the  
AD8013.  
Gener al  
T he AD8013 is a wide bandwidth, triple video amplifier that  
offers a high level of performance on less than 4.0 mA per  
amplifier of quiescent supply current. T he AD8013 uses a  
proprietary enhancement of a conventional current feedback  
architecture, and achieves bandwidth in excess of 200 MHz with  
low differential gain and phase errors, making it an extremely  
efficient video amplifier.  
It should be noted that the bandwidth is affected by attenuation  
due to the finite input resistance. Also, the open-loop output  
resistance of about 12 Ω reduces the bandwidth somewhat when  
driving load resistors less than about 250 Ω. (Bandwidths will  
be about 10% greater for load resistances above a few hundred  
ohms.)  
T he AD8013’s wide phase margin coupled with a high output  
short circuit current make it an excellent choice when driving  
any capacitive load. High open-loop gain and low inverting  
input bias current enable it to be used with large values of  
feedback resistor with very low closed-loop gain errors.  
Table I. –3 dB Bandwidth vs. Closed-Loop Gain and Feedback  
Resistor, RL = 150 Ω (SO IC)  
VS – Volts  
Gain  
RF – O hm s  
BW – MH z  
It is designed to offer outstanding functionality and performance  
at closed-loop inverting or noninverting gains of one or greater.  
±5  
+1  
+2  
+10  
–1  
–10  
+1  
+2  
+10  
–1  
2000  
845 (931)  
301  
698 (825)  
499  
2000  
887 (931)  
301  
698 (825)  
499  
230  
150 (135)  
80  
140 (130)  
85  
180  
120 (130)  
75  
130 (120)  
80  
Choice of Feedback & Gain Resistor s  
Because it is a current feedback amplifier, the closed-loop band-  
width of the AD8013 may be customized using different values  
of the feedback resistor. T able I shows typical bandwidths at  
different supply voltages for some useful closed-loop gains when  
driving a load of 150 Ω.  
+5  
T he choice of feedback resistor is not critical unless it is  
important to maintain the widest, flattest frequency response.  
T he resistors recommended in the table are those (chip  
resistors) that will result in the widest 0.1 dB bandwidth without  
peaking. In applications requiring the best control of bandwidth,  
1% resistors are adequate. Package parasitics vary between the  
14-pin plastic DIP and the 14-pin plastic SOIC, and may result  
in a slight difference in the value of the feedback resistor used to  
achieve the optimum dynamic performance. Resistor values and  
widest bandwidth figures are shown in parenthesis for the SOIC  
where they differ from those of the DIP. Wider bandwidths than  
those in the table can be attained by reducing the magnitude of  
the feedback resistor (at the expense of increased peaking),  
while peaking can be reduced by increasing the magnitude of  
the feedback resistor.  
–10  
D r iving Capacitive Loads  
When used in combination with the appropriate feedback  
resistor, the AD8013 will drive any load capacitance without  
oscillation. T he general rule for current feedback amplifiers is  
that the higher the load capacitance, the higher the feedback  
resistor required for stable operation. Due to the high open-loop  
transresistance and low inverting input current of the AD8013,  
the use of a large feedback resistor does not result in large closed-  
loop gain errors. Additionally, its high output short circuit current  
makes possible rapid voltage slewing on large load capacitors.  
For the best combination of wide bandwidth and clean pulse  
response, a small output series resistor is also recommended.  
T able II contains values of feedback and series resistors which  
result in the best pulse responses. Figure 29 shows the AD8013  
driving a 300 pF capacitor through a large voltage step with  
virtually no overshoot. (In this case, the large and small signal  
pulse responses are quite similar in appearance.)  
Increasing the feedback resistor is especially useful when driving  
large capacitive loads as it will increase the phase margin of the  
closed-loop circuit. (Refer to the section on driving capacitive  
loads for more information.)  
REV. A  
–9–  
1...6789101112

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