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參數資料
| 型號： | AD8132ARZ-R7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Low Cost, High Speed Differential Amplifier |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件頁數： | 26/32頁 |
| 文件大小： | 456K |
| 代理商： | AD8132ARZ-R7 |
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AD8132
Rev. F | Page 26 of 32
499
523
1k
1k
10μF
+
+5V
AD8132
0.1μF
49.9
50
SOURCE
0.1μF
+
0.1μF
10μF
–5V
49.9
49.9
TWISTED
PAIR
100
1
2
3
4
7
5
AD830
+
0.1μF
10μF
–5V
10μF
+
+5V
0.1μF
V
OUT
0
Figure 74. Balanced Line Driver and Receiver Using AD8132 and AD830
Any imbalance in the differential drive signal appears as a
common-mode signal on the cable. This is the equivalent
of a single wire that is driven with the common-mode signal.
In this case, the wire acts as an antenna and radiates. Thus, to
minimize radiation when driving differential twisted pair cables,
make sure the differential drive signal is well balanced.
The common-mode feedback loop in the AD8132 helps to min-
imize the amount of common-mode voltage at the output, and
can therefore be used to create a well-balanced differential line
driver. Figure 74 shows an application that uses an AD8132 as
a balanced line driver and an
AD830
as a differential receiver con-
figured for unity gain. This circuit was operated with 10 meters of
Category 5 cable.
TRANSMIT EQUALIZER
Any length of transmission line attenuates the signals it carries.
This effect is worse at higher frequencies than at lower frequencies.
One way to compensate for this is to provide an equalizer circuit
that boosts the higher frequencies in the transmitter circuit, so
that at the receive end of the cable, the attenuation effects are
diminished.
By lowering the impedance of the R
G
component of the feed-
back network at a higher frequency, the gain can be increased at
a high frequency. Figure 75 shows the gain of a two-line driver
that has its R
G
resistors shunted by 10 pF capacitors. The effect
of this is shown in the frequency response plot of Figure 76.
249
249
49.9
10pF
499
10pF
24.9
V
IN
49.9
499
49.9
100
V
OUT
0
Figure 75. Frequency Boost Circuit
1
1000
20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
V
O
/
I
10
100
FREQUENCY (MHz)
0
Figure 76. Frequency Response for Transmit Boost Circuit
LOW-PASS DIFFERENTIAL FILTER
Similar to an op amp, various types of active filters can be created
with the AD8132. These can have single-ended inputs and differ-
ential outputs that can provide an antialias function when driving
a differential ADC.
Figure 77 is a schematic of a low-pass, multiple feedback filter.
The active section contains two poles, and an additional pole
is added at the output. The filter was designed to have a 3 dB
frequency of 1 MHz. The actual 3 dB frequency was measured
to be 1.12 MHz, as shown in Figure 78.
33pF
2.15k
953
953
33pF
2.15k
100pF
100pF
2k
2k
24.9
49.9
549
54
200pF
200pF
V
IN
V
OUT
0
Figure 77. 1 MHz, 3-Pole Differential Output,
Low-Pass, Multiple Feedback Filter
相關PDF資料 |
PDF描述 |
|---|---|
| AD8132 | Low-Cost, High-Speed Differential Amplifier |
| AD8132-EVAL | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR-REEL | Low-Cost, High-Speed Differential Amplifier |
| AD8132AR-REEL7 | Low-Cost, High-Speed Differential Amplifier |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8132ARZ-R71 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132ARZ-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132ARZ-RL | 功能描述:IC AMP DIFF LDIST LP 70MA 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 |
| AD8132ARZ-RL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost, High Speed Differential Amplifier |
| AD8132-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low-Cost, High-Speed Differential Amplifier |
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