參數(shù)資料
型號(hào)： ADA4851-4
廠商： Analog Devices, Inc.
英文描述： Low Cost, High Speed, Rail-to-Rail, Output Op Amps
中文描述： 低成本，高速，軌到軌輸出運(yùn)算放大器
文件頁(yè)數(shù)： 15/20頁(yè)
文件大小： 325K
代理商： ADA4851-4
ADA4851-1/ADA4851-2/ADA4851-4
SINGLE-SUPPLY VIDEO AMPLIFIER
The ADA4851 family of amplifiers is well-suited for portable
video applications. When operating in low voltage single-supply
applications, the input signal is limited by the input stage
headroom. For additional information, see the Headroom
Considerations section. Table 6 illustrates the effects of supply
voltage, input signal, various gains, and output signal swing for
the typical video amplifier shown in Figure 45.
Rev. D | Page 15 of 20
An example of an 8 MHz, 3-pole, Sallen-Key low pass, video
reconstruction filter is shown in Figure 46. This circuit features
a gain of 3, has a 0.1 dB bandwidth of 8.2 MHz, and over 17 dB
attenuation at 27 MHz (see Figure 47).The filter has 3 poles; two
are active with a third passive pole (R6 and C4) placed at the
output. C3 improves the filter rolloff. R6, R7, and R8 comprise
the video load of 150 Ω. Components R6, C4, R7, R8, and the
input termination of the network analyzer form a 12.8 dB
attenuator; therefore, the reference level is roughly 3.3 dB, as
shown in Figure 47.
75
Ω
CABLE
V
OUT
75
Ω
75
Ω
V
IN
V
′
R
G
R
F
+V
S
P
D
U1
C1
2.2
μ
F
C2
0.01
μ
F
0
+
R2
47
I
OUT
R3
125
R6
6.8
+3V
R7
68.1
R1
37.4
C1
51pF
6C3
C4
1nF
R4
2k
R5
1k
R8
75
V
OUT
5C2
VIDEO DAC
0
Figure 45. Video Amplifier
Table 6. Recommended Values
Supply
Voltage
(V)
(V)
3
0 to 0.8
3
0 to 0.8
5
0 to 2.8
Input
Range
R
G
(kΩ)
1
0.499
1
R
F
(kΩ)
1
1
1
Gain
(V/V)
2
3
2
V’
(V)
1.6
2.4
4.9
V
OUT
(V)
0.8
1.2
2.45
Figure 46. 8 MHz Video Reconstruction Filter Schematic
0
1: –3.3931dB
8.239 626MHz
5dB/REF –15dB
0.03
0.1
1
10
100
1
FREQUENCY (MHz)
VIDEO RECONSTRUCTION FILTER
At higher frequencies, active filters require wider bandwidths to
work properly. Excessive phase shift introduced by lower
frequency op amps can significantly affect the filter performance.
A common application for active filters is at the output of video
DACs/encoders. The filter, or more appropriately, the video
reconstruction filter is used at the output of a video
DAC/encoder to eliminate the multiple images that are created
during the sampling process within the DAC. For portable
video applications, the ADA4851-x is an ideal choice due to its
lower power requirements and high performance.
Figure 47. Video Reconstruction Filter Frequency Performance
相關(guān)PDF資料
PDF描述
ADA4851-2 Low Cost, High Speed, Rail-to-Rail, Output Op Amps
ADA4899-1 Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp
ADA4899-1YCPZ-R2 Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp
ADA4899-1YCPZ-R7 Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp
ADA4899-1YCPZ-RL Unity Gain Stable, Ultralow Distortion, 1 nV/ Hz Voltage Noise, High Speed Op Amp
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADA4851-4WYRUZ-R7 功能描述:IC OPAMP QUAD R-R HS 14-TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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)
ADA4851-4YRU-EBZ 功能描述:BOARD EVAL FOR ADA4851-4YRU RoHS:是 類別:編程器，開(kāi)發(fā)系統(tǒng) >> 評(píng)估板 - 運(yùn)算放大器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:-
ADA4851-4YRUZ 功能描述:IC OPAMP VF R-R QUAD LP 14TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:100 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:0.2 V/µs 增益帶寬積:- -3db帶寬:- 電流 - 輸入偏壓:100pA 電壓 - 輸入偏移:30µV 電流 - 電源:380µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):±2 V ~ 18 V 工作溫度:0°C ~ 70°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:管件
ADA4851-4YRUZ-R7 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed, Rail-to-Rail Output Op Amps
ADA4851-4YRUZ-RL 功能描述:IC OPAMP VF R-R QUAD LP 14TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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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