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參數(shù)資料
| 型號： | ADA4861-3 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Speed, Low Cost, Triple Op Amp |
| 中文描述： | 高速，低成本，三重運算放大器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 623K |
| 代理商： | ADA4861-3 |
ADA4861-3
APPLICATIONS
GAIN CONFIGURATIONS
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.
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 Performance
1
Rev. A | Page 13 of 16
20 MHz ACTIVE LOW-PASS FILTER
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.
V
IN
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
0
U3
OP AMP
+
OUT
–
R5
562
R6
562
C6
10pF
C5
10pF
R8
301
R7
210
V
OUT
Large Signal
0.1 dB Flatness
90
60
100
30
15
Gain
+1
1
+2
+5
+10
R
F
(Ω)
499
301
301
200
200
R
G
(Ω)
N/A
301
301
49.9
22.1
3 dB SS BW (MHz)
730
350
370
180
80
1
Conditions: V
S
= ±5 V, T
A
= 25°C, R
L
= 150 Ω.
Figure 46 and Figure 47 show the typical noninverting and
inverting configurations and recommended bypass capacitor
values.
0
0.1μF
10μF
–V
S
V
IN
R
G
V
OUT
10μF
0.1μF
+V
S
ADA4861-3
+
–
R
F
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
M
FREQUENCY (MHz)
0
0.1μF
10μF
–V
S
V
IN
V
OUT
10μF
0.1μF
+V
S
ADA4861-3
+
–
R
F
R
G
Figure 47. Inverting Gain
Figure 49. 20 MHz Low-Pass Filter Frequency Response
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| ADA4861-3YRZ-RL | 功能描述:IC OPAMP CF TRPL LP 100MA 14SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:8-SO 包裝:帶卷 (TR) |
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| ADA4862-3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed, G = +2, Low Cost, Triple Op Amp |
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