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參數(shù)資料
| 型號(hào)： | OPA685N |
| 英文描述： | Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM |
| 中文描述： | 超寬帶，電流反饋運(yùn)算放大器商標(biāo)使用禁用 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 283K |
| 代理商： | OPA685N |
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19
OPA685
output pin voltage through 65MHz. Measured performance
for this example gave 600MHz small-signal bandwidth and
< –54dBc distortion through 65MHz for a 6Vp-p output pin
voltage swing.
An alternative to this circuit, giving even lower distortion,
is a differential driver using two OPA685s driving into an
output transformer. This can be used either to double the
available line power, or to improve distortion by cutting the
required output swing in half for each stage. The channel
disable required by the MCNS specification should be
implemented by using the PGA disable feature. The MCNS
disable specification requires that an output impedance
match be maintained with the signal channel shut off. The
disable feature of the OPA685 is intended principally for
power savings and puts the output and inverting input pins
into a high impedance mode—this will not maintain the
required output impedance matching. Turning off the signal
at the input of Figure 7, while keeping the OPA685 active,
will maintain the impedance matching while putting very
FIGURE 7. Cable Modem Upstream Driver.
little noise on the line. The line noise in disable for the
circuit of Figure 7 (with the PGA source turned off, but still
presenting a 75
source impedance) will be a very low
4nV/
√
Hz (–157dBm/Hz) due to the low input noise of the
OPA685.
RGB VIDEO LINE DRIVER
The extremely high bandwidth of the OPA685 operating at
a gain of +2 will support the fastest RAMDAC outputs for
applications such as auxiliary monitor driving. As a general
rule, the required full power bandwidth for the amplifier
must be at least one-half the pixel rate. With its non-
inverting gain of +2, slew rate of 1900V/
μ
s, and a 1.4Vp-p
output pin voltage swing for standard RGB video levels, the
OPA685 will give a bandwidth of 400MHz, which will then
support up to 800MHz pixel rates. Figure 8 shows an
example where three OPA685s provide an auxiliary monitor
output for a high resolution RGB RAMDAC.
FIGURE 8. Gain of +2 High Resolution RGB Monitor Output.
OPA685
R
F
450
R
G
75
75
6k
6k
20
75
Diplexer
–3dB
Receive Channel
Supply decoupling
not shown
67dBmV
+12V
PGA Output
58dBmV
0.1
μ
F
0.01
μ
F
0.1
μ
F
51.5dBmV
DIS
OPA685
75
75
511
R
F
511
20
+5V
Blue
–5V
75
Green
RAMDAC
75
Red
Addtional
OPA685
Stages
DIS
Power supply decoupling not shown.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA685U | Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable TM |
| OPA699ID | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA699 | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA699IDR | Wideband, High Gain VOLTAGE LIMITING AMPLIFIER |
| OPA708 | REFLECTIVE OBJECT SENSORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA685N/250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| OPA685N/3K | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| OPA685U | 功能描述:高速運(yùn)算放大器 Ultra-Wideband RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA685U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| OPA686 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low Noise, Voltage Feedback OPERATIONAL AMPLIFIER |
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