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參數(shù)資料
| 型號： | OPA4684IDR |
| 英文描述： | Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER |
| 中文描述： | 四，低功耗，電流反饋運算放大器 |
| 文件頁數(shù)： | 16/26頁 |
| 文件大小： | 455K |
| 代理商： | OPA4684IDR |
OPA4684
SBOS240B
16
www.ti.com
While this circuit is bipolar, using
±
5V supplies, it can easily
be adapted to single-supply operation. This is typically done
by providing a supply midpoint reference at the noninverting
inputs then adding DC-blocking caps at each input and in
series with the amplifier gain resistor, R
G
. This will add two
real zeroes in the response, transforming this circuit into a
bandpass. Figure 10 shows the frequency response for the
filter of Figure 9.
LOW-POWER DSL TRANSCEIVER INTERFACE
With four amplifiers available, the quad OPA4684 can meet
the needs for both differential driver and receiver in a low-
power xDSL line interface design. Figure 11 shows a simpli-
fied design example. Two amplifiers are used as a noninverting
differential driver while the other two implement the driver
echo cancellation and receiver amplifier function. This ex-
ample shows a single +12V design where the drive side is
taking a 2Vp-p maximum input from the transmit filter
and providing a differential gain of 7, giving a maximum
14Vp-p differential output swing. This is coupled through 50
matching resistors and a 1:1 transformer to give a maximum
7Vp-p on a 100
line. This 7Vp-p corresponds to a 10dBm
line power with a 3.5 crest factor.
The differential receiver is configured as an inverting sum-
ming stage where the outputs of the driver are cancelled prior
to appearing at the output of the receive amplifiers. This is
done by summing the output voltages for the drive amplifiers
and their attenuated and inverted levels (at the transformer
input) into the inverting inputs of each receiver amplifier. The
resistor values are set in Figure 11 to give perfect drive signal
cancellation if the drive signal is attenuated by 1/2 going from
the drive amplifier outputs to the transformer input. The
signal received through the transformer has a gain of 1
through the receive amplifiers. Higher gain could easily be
provided by scaling the resistors summing into the inverting
inputs of the receiver amplifiers down while keeping the
same ratio between them.
FIGURE 10. Low-Power, Differential 4th-Order, 100MHz Butterworth.
Frequency (MHz)
D
1
10
100
27
24
21
18
15
12
9
6
3
0
FIGURE 11. Low-Power, XDSL Transceiver Design.
+12V
1/4
OPA4684
AFE
1/4
OPA4684
900
900
300
10k
Transmit
Filter
10k
50
1:1
100
Line
10dBm
3.5 Crest Factor
50
2Vp-p
+6V
Receiver
Filter
1/4
OPA4684
1/4
OPA4684
800
800
14Vp-p
V
CM
V
CM
1.6k
1.6k
800
800
V
CM
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA4684IDRG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWR | 功能描述:高速運算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWRG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWT | 功能描述:高速運算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA4684IPWTG4 | 功能描述:高速運算放大器 Quad Low-Power Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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