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| 型號(hào)： | EL5170IYZ-T7 |
| 廠商： | Intersil |
| 文件頁數(shù)： | 14/14頁 |
| 文件大小： | 0K |
| 描述： | IC DRVR TWIST 100MHZ TRPL 8-MSOP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 差分 |
| 電路數(shù)： | 1 |
| 輸出類型： | 差分 |
| 轉(zhuǎn)換速率： | 1100 V/µs |
| -3db帶寬： | 100MHz |
| 電流 - 輸入偏壓： | 6µA |
| 電壓 - 輸入偏移： | 6000µV |
| 電流 - 電源： | 7.4mA |
| 電流 - 輸出 / 通道： | 80mA |
| 電壓 - 電源，單路/雙路(±)： | 4.75 V ~ 11 V，±2.38 V ~ 5.5 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： | 8-MSOP |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁面： | 1238 (CN2011-ZH PDF) |
| 其它名稱： | EL5170IYZ-T7DKR |
EL5170, EL5370
9
FN7309.9
August 28, 2012
Description of Operation and
Application Information
Product Description
The EL5170 and EL5370 are wide bandwidth, low power and
single/differential ended to differential output amplifiers. They
have a fixed gain of 2. The EL5170 is a single channel
differential amplifier. The EL5370 is a triple channel
differential amplifier. The EL5170 and EL5370 have a -3dB
bandwidth of 100MHz while driving a 200
Ω differential load.
The EL5170 and EL5370 are available with a power-down
feature to reduce the power while the amplifiers are disabled.
Input, Output and Supply Voltage Range
The EL5170 and EL5370 have been designed to operate with a
single supply voltage of 5V to 10V or split supplies with its total
voltage from 5V to 10V. The amplifiers have an input common
mode voltage range from -4.5V to 3.4V for ±5V supply. The
differential mode input range (DMIR) between the two inputs
is from -2.3V to +2.3V. The input voltage range at the REF pin is
from -3.3V to 3.8V. If the input common mode or differential
mode signal is outside the above-specified ranges, it will cause
the output signal to become distorted.
The output of the EL5170 and EL5370 can swing from -3.3V to
3.6V at 200
Ω differential load at ±5V supply. As the load
resistance becomes lower, the output swing is reduced.
Differential and Common Mode Gain
Settings
As shown in the “Simplified Schematic” on page 8, since the
feedback resistors RF and the gain resistor are integrated with
200
Ω and 400Ω, the EL5170 and EL5370 have a fixed gain of
2. The common mode gain is always one.
Driving Capacitive Loads and Cables
The EL5170 and EL5370 can drive 75pF differential capacitor
in parallel with 200
Ω differential load with less than 3.5dB of
peaking. If less peaking is desired in applications, a small
series resistor (usually between 5
Ω to 50Ω) can be placed in
series with each output to eliminate most peaking. However,
this will reduce the gain slightly.
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 EL5170 and EL5370 can be disabled and their outputs
placed in a high impedance state. The turn-off time is about
1s and the turn-on time is about 200ns. When disabled, the
amplifier’s supply current is reduced to 2A for IS+ and 120A
for IS- typically, thereby effectively eliminating the power
consumption. The amplifier’s power-down can be controlled by
standard CMOS signal levels at the ENABLE pin. The applied
logic signal is relative to VS+ pin. Letting the EN pin float or
applying a signal that is less than 1.5V below VS+ will enable
the amplifier. The amplifier will be disabled when the signal at
EN pin is above VS+ -0.5V.
Output Drive Capability
The EL5170 and EL5370 have internal short circuit protection.
Its typical short circuit current is ±80mA. If the output is
shorted indefinitely, the power dissipation could easily
increase such that the part will be destroyed. Maximum
reliability is maintained if the output current never exceeds
±60mA. This limit is set by the design of the internal metal
interconnect.
Power Dissipation
With the high output drive capability of the EL5170 and EL5370
it is possible to exceed the +125°C absolute maximum junction
temperature under certain load current conditions. Therefore, it
is important to calculate the maximum junction temperature for
the application to determine if the load conditions or package
types need to be modified for the amplifier to remain in the safe
operating area.
The maximum power dissipation allowed in a package is
determined according to Equation 1:
Where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
θJA = Thermal resistance of the package
The maximum power dissipation actually produced by an IC is
the total quiescent supply current times the total power supply
voltage, plus the power in the IC due to the load, or as
expressed in Equation 2:
Where:
VSTOT = Total supply voltage = VS+ - VS-
ISMAX = Maximum quiescent supply current per channel
ΔVO = Maximum differential output voltage of the
application
RLD = Differential load resistance
ILOAD = Load current
i = Number of channels
By setting the two PDMAX equations equal to each other, we
can solve the output current and RLOAD to avoid the device
overheat.
PD
MAX
T
JMAX
T
AMAX
–
Θ
JA
---------------------------------------------
=
(EQ. 1)
PD
i
V
STOT
I
SMAX
×
V
(
STOT
ΔV
O )
–
ΔV
O
R
LD
------------
×
+
×
=
(EQ. 2)
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