參數(shù)資料
型號: ADA4861-3YRZ-RL7
廠商: Analog Devices Inc
文件頁數(shù): 6/17頁
文件大?。?/td> 0K
描述: IC OPAMP CF TRPL LP 100MA 14SOIC
標準包裝: 1,000
放大器類型: 電流反饋
電路數(shù): 3
轉(zhuǎn)換速率: 910 V/µs
-3db帶寬: 370MHz
電流 - 輸入偏壓: 2.9µA
電壓 - 輸入偏移: 100µV
電流 - 電源: 17.9mA
電流 - 輸出 / 通道: 100mA
電壓 - 電源,單路/雙路(±): 5 V ~ 12 V,±2.5 V ~ 6 V
工作溫度: -40°C ~ 105°C
安裝類型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應商設(shè)備封裝: 14-SOIC
包裝: 帶卷 (TR)
ADA4861-3
Rev. A | Page 13 of 16
APPLICATIONS
GAIN CONFIGURATIONS
20 MHz ACTIVE LOW-PASS FILTER
Unlike conventional voltage feedback amplifiers, the feedback
resistor has a direct impact on the closed-loop bandwidth and
stability of the current feedback op amp circuit. Reducing the
resistance below the recommended value can make the amplifier
response peak and even become unstable. Increasing the size
of the feedback resistor reduces the closed-loop bandwidth.
The ADA4861-3 triple amplifier lends itself to higher order
active filters. Figure 48 shows a 28 MHz, 6-pole, Sallen-Key
low-pass filter.
VIN
U1
OP AMP
OUT
+
R1
562
R2
562
C2
10pF
C1
10pF
R12
301
R11
210k
U2
OP AMP
OUT
+
R3
562
R4
562
C4
10pF
C3
10pF
R10
301
R9
210
05
70
8-
0
07
U3
OP AMP
OUT
+
R5
562
R6
562
C6
10pF
C5
10pF
R8
301
R7
210
VOUT
Table 5 provides a convenient reference for quickly determining
the feedback and gain set resistor values and bandwidth for
common gain configurations.
Table 5. Recommended Values and Frequency Performance1
Large Signal
0.1 dB Flatness
Gain
RF (Ω)
RG (Ω)
3 dB SS BW (MHz)
+1
499
N/A
730
90
1
301
350
60
+2
301
370
100
+5
200
49.9
180
30
+10
200
22.1
80
15
1 Conditions: VS = ±5 V, TA = 25°C, RL = 150 Ω.
Figure 46 and Figure 47 show the typical noninverting and
inverting configurations and recommended bypass capacitor
values.
0
57
08
-00
5
0.1F
10F
–VS
VIN
RG
VOUT
10F
0.1F
+VS
ADA4861-3
+
RF
Figure 48. 28 MHz, 6-Pole Low-Pass Filter
The filter has a gain of approximately 23 dB and flat frequency
response out to 22 MHz. This type of filter is commonly used at
the output of a video DAC as a reconstruction filter. The frequency
response of the filter is shown in Figure 49.
Figure 46. Noninverting Gain
30
20
–70
–60
–50
–40
–30
–20
–10
0
10
1
10
100
200
0
57
08-
047
M
AG
NI
T
UDE
(
d
B)
FREQUENCY (MHz)
0
57
08
-00
6
0.1F
10F
–VS
VIN
VOUT
10F
0.1F
+VS
ADA4861-3
+
RF
RG
Figure 47. Inverting Gain
Figure 49. 20 MHz Low-Pass Filter Frequency Response
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