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| 型號： | EL2227CS-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP DUAL LOW NOISE 8-SOIC |
| 標準包裝： | 1,000 |
| 放大器類型： | 電壓反饋 |
| 電路數(shù)： | 2 |
| 轉換速率： | 50 V/µs |
| 增益帶寬積： | 137MHz |
| -3db帶寬： | 115MHz |
| 電流 - 輸入偏壓： | 3.4µA |
| 電壓 - 輸入偏移： | 200µV |
| 電流 - 電源： | 4.8mA |
| 電流 - 輸出 / 通道： | 180mA |
| 電壓 - 電源，單路/雙路(±)： | 5 V ~ 24 V，±2.5 V ~ 12 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 8-SOIC |
| 包裝： | 帶卷 (TR) |
11
FN7058.4
September 14 ,2010
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 38. 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 in Figure 39. When
disabled, both the positive and negative supply voltages are
disconnected (see Figure 39).
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 (TJMAX) 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 in Equation 1:
where:
PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
PDMAX for each amplifier can be calculated using
Equation 2:
where:
TMAX = Maximum Ambient Temperature
θJA = Thermal Resistance of the Package
PDMAX = Maximum Power Dissipation of 1 Amplifier
VS = Supply Voltage
IMAX = Maximum Supply Current of 1 Amplifier
VOUTMAX = Maximum Output Voltage Swing of the
Application
RL = 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 TJMAX = +150°C,
TMAX = +75°C, ISMAX = 9.5mA, and the package θJAs are
shown in Table 1. If we assume (for this example) that we are
driving a back-terminated video cable, then the maximum
average value (over duty-cycle) of VOUTMAX is 1.4V, and
FIGURE 38. TYPICAL LINE INTERFACE CONNECTION
-
+
-
+
-
+
-
+
RECEIVE
OUT -
RECEIVE
OUT +
DRIVER
INPUT
RG
RF
R
RIN
R
RIN
RF
ROUT
LINE +
LINE -
RECEIVE
AMPLIFIERS
ZLINE
-
+
1F
4.7F
1F
+12V
1k
10k
75k
1k
FIGURE 39. IMPLEMENTATION OF ENABLE/DISABLE
FUNCTION
TJMAX
TMAX θJA PDMAXTOTAL
×
()
+
=
(EQ. 1)
PDMAX
2VS ISMAX VS
(
VOUTMAX)
VOUTMAX
RL
----------------------------
×
–
+
×
=
(EQ. 2)
EL2227
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