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參數(shù)資料
| 型號(hào)： | EL5374 |
| 英文描述： | Single Output LNB Supply and Control Voltage Regulator with I2C Interface for Advanced Satellite Set-top Box Designs; Temperature Range: Extended Comm; Package: 32-QFN T&R |
| 中文描述： | 500MHz的差分雙絞線驅(qū)動(dòng)器 |
| 文件頁(yè)數(shù)： | 2/15頁(yè) |
| 文件大?。?/td> | 652K |
| 代理商： | EL5374 |
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10
Description of Operation and Application
Information
Product Description
The EL5172 and EL5372 are wide bandwidth, low power
and single/differential ended to single ended output
amplifiers. The EL5172 is a single channel differential to
single ended amplifier. The EL5372 is a triple channel
differential to single ended amplifier. The EL5172 and
EL5372 are internally compensated for closed loop gain of
+1 of greater. Connected in gain of 1 and driving a 500
load, the EL5172 and EL5372 have a -3dB bandwidth of
250MHz. Driving a 150
load at gain of 2, the bandwidth is
about 50MHz. The bandwidth at the REF input is about
450MHz. The EL5172 and EL5372 is available with a power
down feature to reduce the power while the amplifier is
disabled.
Input, Output, and Supply Voltage Range
The EL5172 and EL5372 have been designed to operate
with a single supply voltage of 5V to 10V or a split supplies
with its total voltage from 5V to 10V. The amplifiers have an
input common mode voltage range from -4.3V to 3.3V for
±5V supply. The differential mode input range (DMIR)
between the two inputs is about from -2.3V to +2.3V. The
input voltage range at the REF pin is from -3.6V to 3.3V. If
the input common mode or differential mode signal is outside
the above-specified ranges, it will cause the output signal
distorted.
The output of the EL5172 and EL5372 can swing from -3.8V
to 3.6V at 500
load at ±5V supply. As the load resistance
becomes lower, the output swing is reduced respectively.
Over All Gain Settings
The gain setting for the EL5172 and EL5372 is similar to the
conventional operational amplifier. The output voltage is
equal to the difference of the inputs plus VREF and then
times the gain.
FIGURE 23.
Choice of Feedback Resistor and Gain Bandwidth
Product
For applications that require a gain of +1, no feedback
resistor is required. Just short the OUT+ pin to FBP pin and
OUT- pin to FBN pin. For gains greater than +1, the
feedback resistor forms a pole with the parasitic capacitance
at the inverting input. As this pole becomes smaller, the
amplifier's phase margin is reduced. This causes ringing in
the time domain and peaking in the frequency domain.
Therefore, RF has some maximum value that should not be
exceeded for optimum performance. If a large value of RF
must be used, a small capacitor in the few Pico farad range
in parallel with RF can help to reduce the ringing and
peaking at the expense of reducing the bandwidth.
The bandwidth of the EL5172 and EL5372 depends on the
load and the feedback network. RF and RG appear in
parallel with the load for gains other than +1. As this
combination gets smaller, the bandwidth falls off.
Consequently, RF also has a minimum value that should not
be exceeded for optimum bandwidth performance. For gain
of +1, RF = 0 is optimum. For the gains other than +1,
optimum response is obtained with RF between 500 to
1k
. For AV = 2 and RF = RG = 1k, the BW is about 80MHz
and the frequency response is very flat.
The EL5172 and EL5372 have a gain bandwidth product of
100MHz. For gains
≥5, its bandwidth can be predicted by the
following equation:
Driving Capacitive Loads and Cables
The EL5172 and EL5372 can drive 56pF capacitance in
parallel with 500
load to ground with 4dB of peaking at gain
of +1. If less peaking is desired in applications, a small
series resistor (usually between 5
to 50) can be placed in
series with each output to eliminate most peaking. However,
this will reduce the gain slightly. If the gain setting is greater
than 1, the gain resistor RG can then be chosen to make up
for any gain loss which may be created by the additional
series resistor at the output.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor at the
amplifier's output will isolate the 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 help
to reduce peaking.
Disable/Power-Down
The EL5172 and EL5372 can be disabled and placed its
outputs in a high impedance state. The turn off time is about
1.4s and the turn on time is about 150ns. When disabled,
the amplifier's supply current is reduced to 80A for IS+ and
V
O
V
(
IN +VIN -VREF
+
)
1
R
F
R
G
--------
+
×
–
=
-
+
-
+
Σ
G/B
VO
EN
VIN+
VIN-
VREF
FB
RG
RF
Gain
BW
100MHz
=
×
EL5172, EL5372
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| EL5374IU-T13 | 功能描述:IC DRIVER TRIPLE 550MHZ 28-QSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁(yè)面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
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