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| 型號(hào)： | AD8024ARZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP CF QUAD LP 50MA 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 48 |
| 放大器類型： | 電流反饋 |
| 電路數(shù)： | 4 |
| 轉(zhuǎn)換速率： | 390 V/µs |
| -3db帶寬： | 200MHz |
| 電流 - 輸入偏壓： | 1µA |
| 電壓 - 輸入偏移： | 2000µV |
| 電流 - 電源： | 16mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 24 V，±2.5 V ~ 12 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 769 (CN2011-ZH PDF) |
AD8024
–9–
REV. C
General
The AD8024 is a wide bandwidth, quad video amplifier. It offers a
high level of performance on 16 mA total quiescent supply cur-
rent for closed-loop gains of
±1 or greater.
Bandwidth up to 380 MHz, low differential gain and phase errors,
and high output current make the AD8024 an efficient video
amplifier.
The AD8024’s wide phase margin and high output current make it
an excellent choice when driving any capacitive load.
Choice of Feedback Resistor
Because it is a current feedback amplifier, the closed-loop
bandwidth of the AD8024 may be customized with the feed-
back resistor.
A larger feedback resistor reduces peaking and increases the
phase margin at the expense of reduced bandwidth. A smaller
feedback resistor increases bandwidth at the expense of increased
peaking and reduced phase margin.
The closed-loop bandwidth is affected by attenuation due to the
finite output resistance. The open-loop output resistance of
≈6
reduces the bandwidth somewhat when driving load resistors less
than
≈150 . The bandwidth will be ≈10% greater for load resis-
tance above a few hundred ohms.
The value of the feedback resistor is not critical unless maintaining
the widest or flattest frequency response is desired. Table I shows
the bandwidth at different supply voltages for some useful closed-
loop gains when driving a 150
load. The recommended resistors
are for the widest bandwidth with less than 2 dB peaking.
Table I. –3 dB Bandwidth vs. Closed-Loop Gain Resistor,
RL = 150
VS – Volts
Gain
RF –
BW – MHz
±7.5
+1
5000
350
+2
750
275
+10
400
105
–1
750
165
±12
+1
8000
380
+10
215
150
–1
750
95
±2.5
+2
1125
125
Driving Capacitive Loads
When used in combination with the appropriate feedback resistor,
the AD8024 will drive any load capacitance without oscillation.
In accordance with the general rule for current feedback ampli-
fiers, increased load capacitance requires the use of a higher
feedback resistor for stable operation.
Due to the high open-loop transresistance and low inverting
input current of the AD8024, large feedback resistors do not
create large closed-loop gain errors. In addition, the high output
current allows rapid voltage slewing on large load capacitors.
For wide bandwidth and clean pulse response, an additional
small series output resistor of about 10
is recommended.
–
+
AD8024
RF
RG
RT
RS
+VS
–VS
1.0 F
0.1 F
1.0 F
0.1 F
CL
VO
VIN
Figure 3. Circuit for Driving a Capacitive Load
VOUT
VIN
1V
20nS
2V
Figure 4. Pulse Response Driving a Large Load
Capacitance, CL = 300 pF, G = +3, RFB = 2.32 k
,
RS = 10.5
, RL = 1 k, VS = ±7.5 V
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