參數(shù)資料
型號: ADA4856-3YCPZ-R7
廠商: Analog Devices Inc
文件頁數(shù): 7/20頁
文件大小: 0K
描述: IC AMP 3CH RRO VFB G=2 16LFCSP
標準包裝: 1
應用: 電壓反饋
輸出類型: 滿擺幅
電路數(shù): 3
-3db帶寬: 370MHz
轉換速率: 800 V/µs
電流 - 電源: 7.8mA
電流 - 輸出 / 通道: 52mA
電壓 - 電源,單路/雙路(±): 3 V ~ 5.5 V,±1.5 V ~ 2.75 V
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN 裸露焊盤,CSP
供應商設備封裝: 16-LFCSP-VQ EP(4x4)
包裝: 標準包裝
產品目錄頁面: 768 (CN2011-ZH PDF)
其它名稱: ADA4856-3YCPZ-R7DKR
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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