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參數(shù)資料
| 型號： | EL2227CY-T7 |
| 廠商： | ELANTEC |
| 元件分類： | 運算放大器 |
| 英文描述： | Dual Very Low Noise Amplifier |
| 中文描述： | DUAL OP-AMP, 3000 uV OFFSET-MAX, 137 MHz BAND WIDTH, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 10/11頁 |
| 文件大?。?/td> | 255K |
| 代理商： | EL2227CY-T7 |
10
Applications Information
Product Description
The EL2227 is a dual voltage feedback operational amplifier
designed especially for DMT ADSL and other applications
requiring very low voltage and current noise. It also features
low distortion while drawing moderately low supply current
and is built on Elantec's proprietary high-speed
complementary bipolar process. The EL2227 use a classical
voltage-feedback topology which allows them to be used in a
variety of applications where current-feedback amplifiers are
not appropriate because of restrictions placed upon the
feedback element used with the amplifier. The conventional
topology of the EL2227 allows, for example, a capacitor to
be placed in the feedback path, making it an excellent choice
for applications such as active filters, sample-and-holds, or
integrators.
ADSL CPE Applications
The low noise EL2227 amplifier is specifically designed for
the dual differential receiver amplifier function with ADSL
transceiver hybrids as well as other low-noise amplifier
applications. A typical ADSL CPE line interface circuit is
shown in Figure 1. The EL2227 is used in receiving DMT
down stream signal. With careful transceiver hybrid design
and the EL2227 1.9nV/
√
Hz voltage noise and 1.2pA/
√
Hz
current noise performance, -140dBm/Hz system background
noise performance can be easily achieved.
Disable Function
The EL2227 is in the standard dual amplifier package
without the enable/disable function. A simple way to
implement the enable/disable function is depicted below.
When disabled, both the positive and negative supply
voltages are disconnected (see Figure 2 below.)
Power Dissipation
With the wide power supply range and large output drive
capability of the EL2227, it is possible to exceed the 150°C
maximum junction temperatures under certain load and
power-supply conditions. It is therefore important to
calculate the maximum junction temperature (T
JMAX
) for all
applications to determine if power supply voltages, load
conditions, or package type need to be modified for the
EL2227 to remain in the safe operating area. These
parameters are related as follows:
where:
PD
MAXTOTAL
is the sum of the maximum power
dissipation of each amplifier in the package (PD
MAX
)
PD
MAX
for each amplifier can be calculated as follows:
where:
T
MAX
= Maximum Ambient Temperature
θ
JA
= Thermal Resistance of the Package
PD
MAX
= Maximum Power Dissipation of 1 Amplifier
V
S
= Supply Voltage
I
MAX
= Maximum Supply Current of 1 Amplifier
V
OUTMAX
= Maximum Output Voltage Swing of the
Application
R
L
= Load Resistance
To serve as a guide for the user, we can calculate maximum
allowable supply voltages for the example of the video
cable-driver below since we know that T
JMAX
= 150°C,
T
MAX
= 75°C, I
SMAX
= 9.5mA, and the package
θ
JA
s are
shown in Table 1. If we assume (for this example) that we
FIGURE 1. TYPICAL LINE INTERFACE CONNECTION
-
+
-
+
-
+
-
+
Receive
Out -
Receive
Out +
Driver
Input
R
G
R
F
R
F
R
F
R
R
IN
R
R
IN
R
F
R
OUT
R
OUT
Line +
Line -
Receive
Amplifie
Z
LINE
-
+
1μF
4.7μF
1μF
+12V
1k
10k
10k
75k
1k
1k
FIGURE 2.
T
JMAX
T
MAX
θ
JA
PD
MAXTOTAL
×
(
)
+
=
PD
MAX
2
V
S
I
SMAX
V
S
(
V
OUTMAX
)
V
L
----------------------------
×
–
+
×
×
=
EL2227
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EL2227CYZ | Dual Very Low Noise Amplifier |
| EL2227CYZ-T13 | Dual Very Low Noise Amplifier |
| EL2227CYZ-T7 | Dual Very Low Noise Amplifier |
| EL2228CYZ-T13 | Dual Low Noise Amplifier |
| EL2228CYZ-T7 | Dual Low Noise Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EL2227CYZ | 功能描述:高速運算放大器 EL2227CYZ VERY LW NOISE DL AMP 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| EL2227CYZ-T13 | 功能描述:高速運算放大器 EL2227CYZ VERY LW NOISE DL AMP 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| EL2227CYZ-T7 | 功能描述:高速運算放大器 EL2227CYZ VERY LW NOISE DL AMP 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(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| EL2228 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Low Noise Amplifier |
| EL2228_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Dual Low Noise Amplifier |
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