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參數資料
| 型號： | AD8130ARZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Low Cost 270 MHz Differential Receiver Amplifiers |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | LEAD FREE, SOIC-8 |
| 文件頁數： | 33/40頁 |
| 文件大小： | 549K |
| 代理商： | AD8130ARZ |
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AD8129/AD8130
APPLICATIONS
BASIC GAIN CIRCUITS
The gain of the AD8129/AD8130 can be set with a pair of
feedback resistors. The basic configuration is shown in Figure 132.
The gain equation is the same as that of a conventional op amp:
G = 1 + R
F
/R
G
. For unity-gain applications using the AD8130,
R
F
can be set to 0 (short circuit), and R
G
can be removed (see
Figure 133). The AD8129 is compensated to operate at gains of
10 and higher; therefore, shorting the feedback path to obtain
unity gain causes oscillation.
Rev. C | Page 33 of 40
R
F
R
G
–V
V
OUT
+V
V
IN
–V
S
2
PD
+V
S
+
+
AD8129/
AD8130
6
5
4
8
1
3
7
0.1
μ
F
10
μ
F
0.1
μ
F
10
μ
F
0
Figure 132. Basic Gain Circuit: V
OUT
= V
IN
(1 + R
F
/R
G
)
0.1
μ
F
–V
V
OUT
+V
0.1
μ
F
10
μ
F
V
IN
AD8130
–V
S
2
PD
+V
S
+
+
6
5
4
8
1
3
7
10
μ
F
0
Figure 133. An AD8130 with Unity Gain
The input signal can be applied either differentially or in a
single-ended fashion—all that matters is the magnitude of the
differential signal between the two inputs. For single-ended
input applications, applying the signal to the +IN with IN
grounded creates a noninverting gain, while reversing these
connections creates an inverting gain. Because the two inputs
are high impedance and matched, both of these conditions
provide the same high input impedance. Thus, an advantage of
the active feedback architecture is the ability to make a high
input impedance inverting op amp. If conventional op amps are
used, a high impedance buffer followed by an inverting stage is
needed. This requires two op amps.
TWISTED-PAIR CABLE, COMPOSITE VIDEO
RECEIVER WITH EQUALIZATION USING AN AD8130
The AD8130 has excellent common-mode rejection at its
inputs. This makes it an ideal candidate for a receiver for signals
that are transmitted over long distances on twisted-pair cables.
Category 5 cables are very common in office settings and are
extensively used for data transmission. These cables can also be
used for the analog transmission of signals such as video.
These long cables pick up noise from the environment they pass
through. This noise does not favor one conductor over another
and therefore is a common-mode signal. A receiver that rejects
the common-mode signal on the cable can greatly enhance the
signal-to-noise ratio performance of the link.
The AD8130 is also very easy to use as a differential receiver,
because the differential inputs and the feedback inputs are
entirely separate. This means that there is no interaction
between the feedback network and the termination network,
as there would be in conventional op amp types of receivers.
Another issue with long cables is that there is more attenuation
of the signal at longer distances. Attenuation is also a function
of frequency; it increases to roughly the square root of frequency.
For good fidelity of video circuits, the overall frequency
response of the transmission channel should be flat vs.
frequency. Because the cable attenuates the high frequencies, a
frequency-selective boost circuit can be used to undo this effect.
These circuits are called equalizers.
An equalizer uses frequency-dependent elements (Ls and Cs) to
create a frequency response that is the opposite of the rest of the
channel’s response to create an overall flat response. There are
many ways to create such circuits, but a common technique is to
put the frequency-selective elements in the feedback path of an
op amp circuit. The AD8130 in particular makes this easier
than other circuits, because, once again, the feedback path is
completely independent of the input path and there is no
interaction.
The circuit in Figure 134 was developed as a receiver/equalizer
for transmitting composite video over 300 meters of Category 5
cable. This cable has an attenuation of approximately 20 dB at
10 MHz for 300 meters. At 100 MHz, the attenuation is
approximately 60 dB (see Figure 135).
相關PDF資料 |
PDF描述 |
|---|---|
| AD8131AR-REEL | Low-Cost, High-Speed Differential Driver |
| AD8131 | Low-Cost, High-Speed Differential Driver |
| AD8131-EVAL | Low-Cost, High-Speed Differential Driver |
| AD8131AR | Low-Cost, High-Speed Differential Driver |
| AD8131AR-REEL7 | Low-Cost, High-Speed Differential Driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8130ARZ-REEL | 功能描述:IC AMP DIFF LN LDIST 40MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| AD8130ARZ-REEL7 | 功能描述:IC AMP DIFF LN LDIST 40MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| AD8130-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost 270 MHz Differential Receiver Amplifiers |
| AD8131 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost, High-Speed Differential Driver |
| AD8131_05 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Driver |
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