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參數(shù)資料
| 型號(hào)： | EL5144CW-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 100MHz Single-Supply Rail-to-Rail Amplifiers |
| 中文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 16/19頁(yè) |
| 文件大小： | 499K |
| 代理商： | EL5144CW-T13 |
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16
Figure 1 shows the output of the EL5144 series amplifier
swinging rail to rail with R
F
= 1k
, A
V
= +2 and R
L
= 1M
.
Figure 2 is with R
L
= 150
.
Choice of Feedback Resistor, R
F
These amplifiers are optimized for applications that require a
gain of +1. Hence, no feedback resistor is required.
However, for gains greater than +1, the feedback resistor
forms a pole with the input capacitance. As this pole
becomes larger, phase margin is reduced. This causes
ringing in the time domain and peaking in the frequency
domain. Therefore, R
F
has some maximum value that
should not be exceeded for optimum performance. If a large
value of R
F
must be used, a small capacitor in the few
picofarad range in parallel with R
F
can help to reduce this
ringing and peaking at the expense of reducing the
bandwidth.
As far as the output stage of the amplifier is concerned, R
F
+
R
G
appear in parallel with R
L
for gains other than +1. As this
combination gets smaller, the bandwidth falls off.
Consequently, R
F
also has a minimum value that should not
be exceeded for optimum performance.
For A
V
= +1, R
F
= 0
is optimum. For A
V
= -1 or +2 (noise
gain of 2), optimum response is obtained with R
F
between
300
and 1k
. For A
V
= -4 or +5 (noise gain of 5), keep R
F
between 300
and 15k
.
Video Performance
For good video signal integrity, an amplifier is required to
maintain the same output impedance and the same
frequency response as DC levels are changed at the output.
This can be difficult when driving a standard video load of
150
, because of the change in output current with DC level.
A look at the Differential Gain and Differential Phase curves
for various supply and loading conditions will help you obtain
optimal performance. Curves are provided for A
V
= +1 and
+2, and R
L
= 150
and 10k
tied both to ground as well as
2.5V. As with all video amplifiers, there is a common mode
sweet spot for optimum differential gain/differential phase.
For example, with A
V
= +2 and R
L
= 150
tied to 2.5V, and
the output common mode voltage kept between 0.8V and
3.2V, dG/dP is a very low 0.1%/0.1°. This condition
corresponds to driving an AC-coupled, double terminated
75
coaxial cable. With A
V
= +1, R
L
= 150
tied to ground,
and the video level kept between 0.85V and 2.95V, these
amplifiers provide dG/dP performance of 0.05%/0.20°. This
condition is representative of using the EL5144 series
amplifier as a buffer driving a DC coupled, double
terminated, 75
coaxial cable. Driving high impedance
loads, such as signals on computer video cards, gives
similar or better dG/dP performance as driving cables.
Driving Cables and Capacitive Loads
The EL5144 series amplifiers can drive 50pF loads in
parallel with 150
with 4dB of peaking and 100pF with 7dB
of peaking. If less peaking is desired in these applications, a
small series resistor (usually between 5
and 50
) can be
placed in series with the output to eliminate most peaking.
However, this will obviously reduce the gain slightly. If your
gain is greater than 1, the gain resistor (R
G
) can then be
chosen to make up for any gain loss which may be created
by this additional resistor at the output. Another method of
reducing peaking is to add a “snubber” circuit at the output. A
snubber is a resistor in a series with a capacitor, 150
and
100pF being typical values. The advantage of a snubber is
that it does not draw DC load current.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, the back-termination series resistor will de-
couple the EL5144 series amplifier from the cable and allow
extensive capacitive drive. However, other applications may
have high capacitive loads without a back-termination
resistor. Again, a small series resistor at the output can
reduce peaking.
Disable/Power-Down
The EL5146 and EL5246 amplifiers can be disabled, placing
its output in a high-impedance state. Turn off time is only
10ns and turn on time is around 500ns. When disabled, the
amplifier’s supply current is reduced to 2.6μA typically,
thereby effectively eliminating power consumption. The
amplifier’s power down can be controlled by standard TTL or
CMOS signal levels at the CE pin. The applied logic signal is
0V
5V
FIGURE 1.
0V
5V
FIGURE 2.
EL5144, EL5146, EL5244, EL5246, EL5444
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL5144CW-T7 | 100MHz Single-Supply Rail-to-Rail Amplifiers |
| EL5146 | 100MHz Single-Supply Rail-to-Rail Amplifiers(100MHz 單電源軌對(duì)軌放大器) |
| EL5246 | 100MHz Single-Supply Rail-to-Rail Amplifiers(100MHz 單電源軌對(duì)軌放大器) |
| EL5244 | 100MHz Single-Supply Rail-to-Rail Amplifiers(100MHz 單電源軌對(duì)軌放大器) |
| EL5444 | 100MHz Single-Supply Rail-to-Rail Amplifiers(100MHz 單電源軌對(duì)軌放大器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL5144CW-T7 | 功能描述:運(yùn)算放大器 - 運(yùn)放 100MHZ R-R RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| EL5144CW-T7A | 功能描述:運(yùn)算放大器 - 運(yùn)放 100 MHz Rail to Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| EL5144CWZ-T7 | 功能描述:IC AMP VFA SINGLE 100MH SOT23-5 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| EL5144CWZ-T7A | 功能描述:IC AMP VFA SINGLE 100MH SOT23-5 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)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(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
| EL514-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Logic IC |
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