参数资料
| 型号： | ISL55020IRZ |
| 厂商： | Intersil |
| 文件页数： | 11/11页 |
| 文件大小： | 0K |
| 描述： | IC AMP DIFF WIDEBAND 16-QFN |
| 标准包装： | 90 |
| 放大器类型： | 差分 |
| 电路数： | 1 |
| 输出类型： | 差分 |
| 转换速率： | 1200 V/µs |
| -3db带宽： | 300MHz |
| 电流 - 输入偏压： | 25µA |
| 电压 - 输入偏移： | 15000µV |
| 电流 - 电源： | 21mA |
| 电流 - 输出 / 通道： | 150mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 12 V，±2.25 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（4x4） |
| 包装： | 管件 |
9
FN6287.0
December 18, 2006
Feedback Resistor, Gain Bandwidth Product and
Stability Considerations (See Figure 18 - Basic
Application Schematic)
For gains greater than 1, the feedback resistor forms a pole
with the parasitic capacitance at the inverting input. As this
pole becomes lower in frequency, the amplifier's phase
margin is reduced. Excessive parasitic capacitance at the
input will cause excessive ringing in the time domain and
peaking in the frequency domain. High feedback resistor
values have the same effect, and therefore should be kept
as low as possible. Figure 5 shows the gain-peaking effect of
using higher feedback resistor values. Feedback resistor RF
has some maximum value that should not be exceeded for
optimum performance.
Unlike voltage feedback (VFA) amplifier topologies that
exhibit constant gain-bandwidth product, CFA amplifiers
maintain high bandwidth at gains high greater than 1.
Figure 3 illustrates the nearly constant bandwidth from a
single-ended gain (AVS) of 2.5 to 5, and only a slight
reduction out to a AVS of 50. For the gains other than 1,
optimum response is obtained with RF between 500Ω to
1k
Ω.
The high impedance inputs IN+ and IN- are sensitive
parasitic capacitance and inductance. To ensure input
stability, a small value resistor (200
Ω recommended) should
be placed as close to the device IN+ and IN- pins as
possible.
Driving Capacitive Loads and Cables
Excessive output capacitance also contributes to gain
peaking (Figure 2) and high overshoot in pulse applications.
For PC board layouts requiring long traces at the output, a
5
Ω to 50Ω) should be inserted as close to the device output
pin as possible to each to minimize peaking,. The resultant
gain error should be compensated with an appropriate
adjustment of RG.
When used as a cable driver, double termination is always
recommended for reflection-free performance. For those
applications, a back-termination series resistor (RS) 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 ISL55020 can be disabled with it’s outputs in a high
impedance state. The turn off time is about 250nS and the
turn on time is about 12nS (Figure 17). When disabled, the
amplifier's supply current is reduced to 1.4mA for IS+ and -
1.6mA for IS- typically. The amplifier's power down can be
controlled by standard ground-referenced CMOS signal
levels at the EN pin. V.
Output Drive Capability
The ISL55020 has no internal current-limiting circuitry. If the
output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.internal
short circuit protection.
Power Dissipation
With the high output drive capability of the ISL55020, It is
possible to exceed the +150°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.
A thermal shutdown circuit is included that implements a
thermal shutdown if the junction temperature exceeds
~+185°C. The thermal shutdown includes thermal hysteresis
of ~+15°C. The thermal shutdown feature is designed to
protect the device during accidental overload conditions and
continuous operation at junction temperatures greater than
+150°C should never be allowed.
The maximum power dissipation allowed in a package is
determined according to:
Where:
TJMAX = Maximum junction temperature
TAMAX = Maximum ambient temperature
θ
JA = 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:
Where:
VS = Total supply voltage
ISMAX = Maximum quiescent supply current per channel
ΔV
O = Maximum differential output voltage of the
application
RLD = Differential load resistance
ILOAD = Load current
By setting the two PDMAX equations equal to each other, we
can solve the output current and RLD to avoid the device
overheat.
PD
MAX
T
JMAX
T
AMAX
–
Θ
JA
---------------------------------------------
=
PD
V
S
I
SMAX
V
S
ΔV
O
R
LD
------------
×
+
×
=
ISL55020
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相关代理商/技术参数 |
参数描述 |
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| ISL55020IRZ-T13 | 功能描述:IC AMP DIFF WIDEBAND 16-QFN RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| ISL55033 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:400MHz Slew Rate Enhanced Rail-to-Rail Output Gain Block |
| ISL55033EVAL1Z | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:400MHz Slew Rate Enhanced Rail-to-Rail Output Gain Block |
| ISL55033IRTZ | 功能描述:视频放大器 ISL59483IRZ DL500MHZ TRPL MLTIPLXNG AMPIF RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
| ISL55033IRTZ-T13 | 功能描述:视频放大器 ISL59482IRZ DL500MHZ TRPL MLTIPLXNG AMPIF RoHS:否 制造商:ON Semiconductor 通道数量:4 电源类型: 工作电源电压:3.3 V, 5 V 电源电流: 最小工作温度: 最大工作温度: 封装 / 箱体:TSSOP-14 封装:Reel |
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