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參數(shù)資料
| 型號： | ADA4851-4YRUZ-RL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/25頁 |
| 文件大小： | 0K |
| 描述： | IC OPAMP VF R-R QUAD LP 14TSSOP |
| 標準包裝： | 1,000 |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 4 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 375 V/µs |
| -3db帶寬： | 105MHz |
| 電流 - 輸入偏壓： | 2.2µA |
| 電壓 - 輸入偏移： | 600µV |
| 電流 - 電源： | 2.9mA |
| 電流 - 輸出 / 通道： | 83mA |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 12 V，±1.35 V ~ 6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 14-TSSOP（0.173"，4.40mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 14-TSSOP |
| 包裝： | 帶卷 (TR) |
ADA4851-1/ADA4851-2/ADA4851-4
Rev. J | Page 19 of 24
SINGLE-SUPPLY VIDEO AMPLIFIER
An example of an 8 MHz, three-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
three poles; two are active with a third passive pole (R6 and C4)
placed at the output. C3 improves the filter roll-off. 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.
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 shows the recommended values
for voltage, input signal, various gains, and output signal swing
for the typical video amplifier shown in Figure 45.
75
Ω CABLE
VOUT
75
Ω
75
Ω
VIN
V
′
RG
RF
+VS
PD
U1
C1
2.2
μF
C2
0.01
μF
05143-
059
+
R2
47
IOUT
R3
125
R6
6.8
+3V
R7
68.1
R1
37.4
C1
51pF
C3
6.8pF
C4
1nF
R4
2k
R5
1k
R8
75
VOUT
C2
51pF
VIDEO DAC
05
14
3-
06
1
Figure 45. Video Amplifier
Table 6. Recommended Values
Supply
Voltage
(V)
Input
Range
(V)
RG
(kΩ)
RF
(kΩ)
Gain
(V/V)
V’
(V)
Figure 46. 8 MHz Video Reconstruction Filter Schematic
VOUT
(V)
05
143
-06
2
1: –3.3931dB
8.239626MHz
5dB/REF –15dB
0.03
0.1
1
10
100
1
FREQUENCY (MHz)
3
0 to 0.8
1
2
1.6
0.8
3
0 to 0.8
0.499
1
3
2.4
1.2
5
0 to 2.8
1
2
4.9
2.45
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 appli-
cations, the ADA4851 family of amplifiers is an ideal choice due
to its lower power requirements and high performance.
Figure 47. Video Reconstruction Filter Frequency Performance
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