参数资料
| 型号： | EL4501IUZ |
| 厂商： | Intersil |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC VIDEO FRONT END AMP 24-QSOP |
| 标准包装： | 55 |
| 应用： | 视频前端（VFE） |
| 电路数： | 1 |
| -3db带宽： | 100MHz |
| 转换速率： | 96 V/µs |
| 电流 - 电源： | 10.5mA |
| 电流 - 输出 / 通道： | 70mA |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1233 (CN2011-ZH PDF) |
19
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Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
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reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
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which in turn decreases the reference time and pulse width.
A higher frequency video input requires a lower RFREQ
value. The Line Rates vs RFREQ performance curve shows
the variation of line rate with RFREQ.
Slice Mode and Operation with VCRs
Normally the signal source for the EL4501 is assumed to be
clean and relatively noise free. If that is the case, the SLICE
MODE pin (pin 16) should be connected to ground, which
sets the slice level to 50% of the sync tip. Some signal
sources may have excessive video peaking, causing high
frequency video and chroma components to extend below
the black level reference, such as VCR signals which
generate lots of head switching noise. In this case, the
SLICE MODE pin should be connected to logic high which
sets the slice level to a fixed 100mV above the sync tip. Also,
a single pole chroma filter is required at the composite video
input to increase the S/N ratio of the incoming noisy video
signal. When the source impedance is low, typically 75
Ω, a
620
Ω resistor in series with the source and 470pF capacitor
to ground will form a low pass filter with a roll-off frequency of
about 550kHz. This bandwidth sufficiently attenuates the
3.58MHz (NTSC) or 4.43MHz (PAL) color burst signal and
high frequency spikes, yet passes the sync pulse portion
without appreciable attenuation. The chroma filter will
increase the propagation delay from the composite sync
input to the outputs. Applying a chroma filter, setting the
SLICE MODE pin and FSEL pin to high greatly improve the
noise immunity performance in VCR applications.
Output Drive Capability
The outputs of the sync separator are not designed to drive
heavy loads. For a 5V VDS, if the output is driving 5k
Ω load
to ground, the output high voltage is about 4.9V. If the output
is driving 500
Ω load, the output high voltage is down to 4.2V.
General
Power Dissipation
With the high output drive capability of the EL4501 video
amplifier, it is possible to exceed the 125°C Absolute
Maximum junction temperature under certain load current
conditions. It is important to calculate the maximum junction
temperature for a given application to determine if load
conditions or package type need to be modified for the
amplifier to remain in its safe operating region.
The maximum power dissipation allowed in a package is
determined according to:
where:
TJMAX = Maximum junction temperature (125°C)
TAMAX = Maximum ambient temperature (85°C)
θJA = Thermal resistance of the package
PDMAX = Maximum power dissipation in the package
The maximum power dissipation actually produced by an IC
is the product of total quiescent supply current and power
supply voltage, plus the power in the IC due to the load.
Assume no load at the sync separator outputs:
where:
VS = Supply voltage
VSD = Digital supply
ISMAX = Maximum supply current
ISDMAX = Maximum digital supply current
VOUT = Maximum output voltage
RL = Load resistance tied to ground
Board Layout
As with any high frequency device, good printed circuit
board layout is necessary for optimum performance. Ground
plane construction is highly recommended. Lead lengths
should be as short as possible. The power supply pin must
be well bypassed to reduce the risk of oscillation. In normal
operation, where the GND pin is connected to the ground
plane, a single 4.7F tantalum capacitor in parallel with a
0.1F ceramic capacitor from VS to GND will suffice. To
reduce cross talk between the analog signal path and the
embedded sync separator, a separate digital supply pin, VSD
is included on the EL4501. This pin should be bypassed in a
similar manner to VS. For additional isolation a ferrite bead
may be added in line with the supply connections to both
pins. For good AC performance, parasitic capacitance
should be kept to a minimum. Use of wire wound resistors
should be avoided because of their additional series
inductance.
PDMAX
TJMAX - TAMAX
Θ
JA
---------------------------------------------
=
PDMAX
VS ISMAX VSD ISDMAX
V
(
S - VOUT )
VOUT
RL
----------------
×
+
×
+
×
=
EL4501
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相关代理商/技术参数 |
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| EL4501IUZT13 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Video Front End |
| EL4501IUZ-T13 | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4501IUZ-T7 | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4501IUZ-T7A | 功能描述:视频 IC EL4501IUZ VID FRONT END RoHS:否 制造商:Fairchild Semiconductor 工作电源电压:5 V 电源电流:80 mA 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-28 封装:Reel |
| EL4502 | 功能描述:高速光耦合器 Optocouplers RoHS:否 制造商:Avago Technologies 电流传递比: 最大波特率: 最大正向二极管电压:1.75 V 最大反向二极管电压:5 V 最大功率耗散:40 mW 最大工作温度:+125 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-5 封装:Tube |
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