参数资料
| 型号： | ADA4891-4ARZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R CMOS 14SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 210 V/µs |
| -3db带宽： | 240MHz |
| 电流 - 输入偏压： | 2pA |
| 电压 - 输入偏移： | 2500µV |
| 电流 - 电源： | 4.4mA |
| 电流 - 输出 / 通道： | 125mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
Data Sheet
ADA4891-1/ADA4891-2/ADA4891-3/ADA4891-4
Rev. E | Page 19 of 24
VIDEO RECONSTRUCTION FILTER
A common application for active filters is at the output of video
digital-to-analog converters (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 ADA4891 is an ideal choice due
to its lower power requirements and high performance.
For active filters, a good rule of thumb is that the 3 dB band-
width of the amplifiers be at least 10 times higher than the corner
frequency of the filter. This ensures that no initial roll-off is
introduced by the amplifier and that the pass band is flat until
the cutoff frequency.
An example of a 15 MHz, 3-pole, Sallen-Key, low-pass video
reconstruction filter is shown in Figure 62. This circuit features
a gain of +2, a 0.1 dB bandwidth of 7.3 MHz, and over 17 dB
attenuation at 29.7 MHz (see Figure 63). The filter has three
poles: two poles are active, with a third passive pole (R6 and C4)
placed at the output. C3 improves the filter roll-off. R6, R7, and
R8 make up the video load of 150 . Components R6, C4, R7,
R8, and the input termination of the network analyzer form a
6 dB attenuator; therefore, the reference level is roughly 0 dB,
as shown in Figure 63.
R2
47
VIN
R3
125
R6
6.8
+5V
R7
68.1
R1
C1
51pF
C3
15pF
C4
1nF
R4
1k
R5
1k
R8
75
VOUT
C2
51pF
08054-
062
Figure 62. 15 MHz Video Reconstruction Filter Schematic
–39
–36
–33
–30
–27
–24
–21
–18
–15
–12
–9
–6
–3
0
0.03
0.1
1
10
100
M
AG
NI
T
UDE
(
d
B)
FREQUENCY (MHz)
08054-
059
Figure 63. Video Reconstruction Filter Frequency Performance
MULTIPLEXER
The ADA4891-3 has a disable pin used to power down the
amplifier to save power or to create a mux circuit. If two or
more ADA4891-3 outputs are connected together and only one
output is enabled, then only the signal of the enabled amplifier
appears at the output. This configuration is used to select from
various input signal sources. Additionally, the same input signal
is applied to different gain stages, or differently tuned filters, to
make a gain-step amplifier or a selectable frequency amplifier.
Figure 64 shows a schematic of two ADA4891-3 devices used
to create a mux that selects between two inputs. One input is a
1 V p-p, 3 MHz sine wave; the other input is a 2 V p-p, 1 MHz
sine wave.
49.9Ω
453Ω
+2.5V
–2.5V
+2.5V
–2.5V
49.9Ω
1V p-p
3MHz
2V p-p
1MHz
VOUT
SELECT
HCO4
453Ω
10F
0.1F
10F
0.1F
49.9
Ω
453Ω
10F
0.1F
10F
0.1F
08054-
087
ADA4891-3
Figure 64. Two-to-One Multiplexer Using Two ADA4861-3 Devices
The select signal and the output waveforms for this circuit are
shown in Figure 65.
1s/DIV
1V/DIV
1s/DIV
5V/DIV
SELECT
OUTPUT
08054-
088
Figure 65. ADA4861-3 Mux Output
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相关代理商/技术参数 |
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| ADA4891-4ARZ-RL | 功能描述:IC OPAMP GP R-R CMOS 14SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| ADA4891-4WARUZ-R7 | 功能描述:高速运算放大器 Lw Cst CMOS Hgh Spd RR Amp Quad RoHS:否 制造商:NXP Semiconductors 通道数量: 电压增益 dB: 输入补偿电压: 转换速度: 工作电源电压: 电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SO-20 封装:Tube 产品: |
| ADA4895-1ARJZ-R2 | 功能描述:IC OPAMP GP 236MHZ RRO SOT23-6 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:在售 放大器类型:通用 电路数:1 输出类型:满摆幅 压摆率:943 V/μs -3db 带宽:236MHz 电流 - 输入偏置:11μA 电压 - 输入失调:53μV 电流 - 电源:3mA 电压 - 电源，单/双（±）:3 V ~ 10 V，±1.5 V ~ 5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商器件封装:SOT-23-6 标准包装:1 |
| ADA4895-1ARJZ-R7 | 功能描述:高速运算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 产品: |
| ADA4895-1ARJZ-RL | 功能描述:高速运算放大器 6Lead SOT23 Decomp L/N L/P Op Amp Single RoHS:否 制造商:Texas Instruments 通道数量:1 电压增益 dB:116 dB 输入补偿电压:0.5 mV 转换速度:55 V/us 工作电源电压:36 V 电源电流:7.5 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube 产品: |
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