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参数资料
| 型号： | ADA4856-3YCPZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP 3CH RRO VFB G=+2 16LFCSP |
| 标准包装： | 5,000 |
| 应用： | 电压反馈 |
| 输出类型： | 满摆幅 |
| 电路数： | 3 |
| -3db带宽： | 370MHz |
| 转换速率： | 800 V/µs |
| 电流 - 电源： | 7.8mA |
| 电流 - 输出 / 通道： | 52mA |
| 电压 - 电源，单路/双路(±)： | 3 V ~ 5.5 V，±1.5 V ~ 2.75 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘，CSP |
| 供应商设备封装： | 16-LFCSP-VQ EP（4x4） |
| 包装： | 带卷 (TR) |
Data Sheet
ADA4856-3
Rev. B | Page 15 of 20
20 MHz ACTIVE LOW-PASS FILTER
The ADA4856-3 triple amplifier lends itself to higher order
active filters. Figure 42 shows a 20 MHz, 6-pole, Sallen-Key
low-pass filter.
VIN
U1
OP AMP
OUT1
+
–
R1
93.1Ω
R2
604Ω
C2
22pF
C1
33pF
U2
OP AMP
OUT2
+
–
R3
113
R4
732
C4
15pF
C3
33pF
U3
OP AMP
OUT3
+
–
R5
121
R6
475
C6
15pF
C5
47pF
07686-
049
VOUT
Figure 42. 20 MHz, 6-Pole Low-Pass Filter
The filter has a gain of approximately 18 dB, which is set by
three fixed gain of 2 stages, and a flat frequency response out to
14 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 43.
20
10
0
–10
–20
–30
–40
–50
–60
1
10
100
200
M
AG
NI
T
UDE
(
d
B)
FREQUENCY (MHz)
07686-
050
SIX POLES
TWO POLES
FOUR POLES
Figure 43. 20 MHz, Low-Pass Filter Frequency Response
VIDEO LINE DRIVER
The ADA4856-3 was designed to excel in video driver applications.
Figure 44 shows a typical schematic for a video driver operating
on bipolar supplies.
1
2
3
ADA4856-3
07686-
051
PD
0.1F
10F
0.1F
+
0.1F
10F
+
7
5
7
5
7
5
7
5
7
5
7
5
–VS
+VS
VOUT (R)
VIN (R)
VIN (G)
VIN (B)
VOUT (G)
VOUT (B)
16
15
14
13
5
6
7
12
11
10
9
4
8
Figure 44. Video Driver Schematic
In applications that require multiple video loads be driven
simultaneously, the ADA4856-3 can deliver. Figure 45 shows
the ADA4856-3 configured with triple video loads. Figure 46
shows the triple video load performance.
07686-
052
75Ω
CABLE
75Ω
CABLE
75Ω
VOUT2
VOUT1
–VS
+VS
VIN
0.1F
10F
75Ω
CABLE
75Ω
CABLE
75Ω
VOUT3
+
–
ADA4856-3
0.1F
Figure 45. Video Driver Schematic for Triple Video Loads
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
1
10
100
200
M
AG
NI
T
UDE
(
d
B)
FREQUENCY (MHz)
07686-
053
RL = 150
RL = 75
RL = 50
VS = 5V
VOUT = 1V p-p
Figure 46. Large Signal Frequency Response for Various Loads
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