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| 型号： | AD8129ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 31/41页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF LN LDIST 40MA 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 转换速率： | 1070 V/µs |
| -3db带宽： | 200MHz |
| 电流 - 输入偏压： | 500nA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 13mA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 25.2 V，±2.25 V ~ 12.6 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) |
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AD8129/AD8130
Rev. C | Page 36 of 40
Such a connection, also referred to as a cable-tap amplifier, can
be simply made with an AD8130 (see Figure 143). The circuit is
configured with unity gain, and if no output offset is desired,
the REF pin is grounded. The negative differential input is
connected directly to the shield of the cable (or an associated
connector) at the point at which it wants to be tapped.
75
Ω
75
Ω
VIDEO
IN
VOUT
–V
+V
–VS
PD
+VS
+
AD8130
6
2
5
4
8
1
37
0.1
μF
10
μF
0.1
μF10μF
02464-144
Figure 143. The AD8130 Can Tap the Video Signal at Any Point Along the
Cable Without Loading the Signal.
The center conductor connects to the positive differential input
of the AD8130. The amplitude of the video signal at this point is
unity, because it is between the two termination resistors. The
AD8130 provides a high impedance to this signal so that the
signal is not disturbed. A buffered unity-gain version of the
video signal appears at the output.
POWER-DOWN
The AD8129/AD8130 have a power-down pin that can be used
to lower the quiescent current when the amplifier is not being
used. A logic low level on the PD pin causes the part to power
down. Because there is no ground pin on the AD8129/AD8130,
there is no logic reference to interface to standard logic levels.
For this reason, the reference level for the PD input is VS. If
the AD8129/AD8130 are run with VS = 5 V, there is direct
compatibility with logic families. However, if VS is higher than
this, a level-shift circuit is needed to interface to conventional
logic levels. A simple level-shifting circuit that is compatible
with common logic families is presented in Figure 144.
AD8129/
AD8130
7
+VS
3 PD
1k
Ω
4.99k
Ω
LOW =
POWER-DOWN
2N2222
OR EQ
02464-145
Figure 144. Circuit that Shifts the Logic Level When VS Is Not Equal to
Approximately 5 V.
EXTREME OPERATING CONDITIONS
The AD8129/AD8130 are designed to provide high
performance over a wide range of supply voltages. However,
there are some extremes of operating conditions that have
been observed to produce suboptimal results. One of these
conditions occurs when the AD8130 is operated at unity gain
with low supply voltage—less than approximately ±4 V.
At unity gain, the output drives FB directly. With supplies of
±VS less than approximately ±4 V at unity gain, the output can
drive FB’s voltage too close to the rail for the circuit to stay
properly biased. This can lead to a parasitic oscillation.
A way to prevent this is to limit the input signal swing with
clamp diodes. Common silicon-junction signal diodes like the
1N4148 have a forward bias of approximately 0.7 V when about
1 mA of current flows through them. Two series pairs of such
diodes connected antiparallel across the differential inputs can
be used to clamp the input signal and prevent this condition. It
should be noted that the REF input can also shift the output
signal; therefore, this technique only works when REF is at
ground or close to it (see Figure 145).
AD8130
VOUT
–V
+V
–VS
PD
+VS
+
VIN
1N4148
VIN
6
2
5
4
8
1
3
7
0.1
μF
10
μF
0.1
μF10μF
02464-146
Figure 145. Clamping Diodes at the Input Limits the Input Swing Amplitude
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8129-EVAL | 制造商:Analog Devices 功能描述:AD8129 EVALUATION BOARD |
| AD812AN | 制造商:Analog Devices 功能描述:OP Amp Dual Current Fdbk 制造商:Rochester Electronics LLC 功能描述:DUAL LO PWR I-FDBK OP AMP - Bulk 制造商:Analog Devices 功能描述:IC OP-AMP LOW POWER |
| AD812ANZ | 功能描述:IC OPAMP DUAL CURR-FDBK 8-DIP RoHS:是 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 应用:TFT-LCD 面板：VCOM 驱动器 输出类型:满摆幅 电路数:1 -3db带宽:35MHz 转换速率:40 V/µs 电流 - 电源:3.7mA 电流 - 输出 / 通道:1.3A 电压 - 电源，单路/双路(±):9 V ~ 20 V，±4.5 V ~ 10 V 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 供应商设备封装:8-uMax-EP 包装:管件 |
| AD812AR | 功能描述:IC OPAMP DUAL CURR-FDBK 8-SOIC RoHS:否 类别:集成电路 (IC) >> 线性 - 放大器 - 视频放大器和频缓冲器 系列:- 标准包装:1,000 系列:- 应用:驱动器 输出类型:差分 电路数:3 -3db带宽:350MHz 转换速率:1000 V/µs 电流 - 电源:14.5mA 电流 - 输出 / 通道:60mA 电压 - 电源，单路/双路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安装类型:表面贴装 封装/外壳:20-VFQFN 裸露焊盘 供应商设备封装:20-QFN 裸露焊盘（4x4） 包装:带卷 (TR) |
| AD812AR-8 | 制造商:Analog Devices 功能描述: |
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