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EL4450CN PDF预览

EL4450CN

更新时间: 2024-10-27 22:49:11
品牌 Logo 应用领域
英特矽尔 - INTERSIL 光电二极管
页数 文件大小 规格书
10页 170K
描述
Wideband Four-Quadrant Multiplier

EL4450CN 数据手册

 浏览型号EL4450CN的Datasheet PDF文件第4页浏览型号EL4450CN的Datasheet PDF文件第5页浏览型号EL4450CN的Datasheet PDF文件第6页浏览型号EL4450CN的Datasheet PDF文件第8页浏览型号EL4450CN的Datasheet PDF文件第9页浏览型号EL4450CN的Datasheet PDF文件第10页 
EL4450  
The maximum dissipation a package can offer is:  
inputs between 200mVRMS and 1VRMS. The traditional use  
of the EL4450 as an AGC detector and control loop would  
be:  
P ,max = (T ,max–T ,max)/θ  
D
J
A
JA  
Where  
T ,max is the maximum junction temperature, 150°C for  
J
reliability, less to retain optimum electrical performance  
T ,max is the ambient temperature, 70°C for commercial  
A
and 85°C for industrial range  
θ
is the thermal resistance of the mounted package,  
JA  
obtained from data sheet dissipation curves  
The more difficult case is the SO-14 package. With a  
maximum junction temperature of 150°C and a maximum  
ambient temperature of 85°C, the 65°C temperature rise and  
package thermal resistance of 120°/W gives a dissipation of  
542mW at 85°C. This allows the full maximum operating  
supply voltage unloaded, but reduced if loaded significantly.  
FIGURE 1. TRADITIONAL AGC DETECTOR/DC  
FEEDBACK CIRCUIT  
The EL4450 simply provides an output equal to the square  
of the input signal and an integrator filters out the AC  
component, while comparing the DC component to an  
amplitude reference. The integrator output is the DC control  
voltage to the variable-gain sections of the AGC (not shown).  
If a negative polarity of reference is required, one of the  
multiplier input terminal pairs is reversed, inverting the  
multiplier output. Input bias current will cause input voltage  
offsets due to source impedances; putting a compensating  
resistor in series with the grounded inputs of the EL4450 will  
reduce this offset greatly.  
Output Loading  
The output stage is very powerful. It typically can source  
85mA and sink 120mA. Of course, this is too much current to  
sustain and the part will eventually be destroyed by  
excessive dissipation or by metal traces on the die opening.  
The metal traces are completely reliable while delivering the  
30mA continuous output given in the Absolute Maximum  
Ratings table in this data sheet, or higher purely transient  
currents.  
Gain accuracy degrades only 0.2% from no load to 100Ω  
load. Heavy resistive loading will degrade frequency  
response and video distortion for loads < 100.  
This control system will attempt to force:  
2
V
,RMS /4=V  
REF  
IN  
Capacitive loads will cause peaking in the frequency  
response. If a capacitive load must be driven, a small-valued  
series resistor can be used to isolate it. 12to 51should  
suffice. A 22series resistor will limit peaking to 2.5dB with  
even a 220pF load.  
Mixer Applications  
Because of its lower distortion levels, the Y input is the better  
choice for a mixer’s signal port. The X input would receive  
oscillator amplitudes of about 1V RMS maximum. Carrier  
suppression is initially limited by the offset voltage of the Y  
input, 20mV maximum, and is about 37dB worst-case. Better  
suppression can be obtained by nulling the offset of the X  
input. Similarly, nulling the offset of the Y input will improve  
signal-port suppression. Driving an input differentially will  
also maximize feedthrough suppression at frequencies  
beyond 10MHz.  
AC Level Detectors  
Square-law converters are commonly used to convert AC  
signals to DC voltages corresponding to the original  
amplitude in subsystems like automatic gain controls (AGCs)  
and amplitude-stabilized oscillators. Due to the controlled AC  
amplitudes, the inputs of the multiplier will see a relatively  
constant signal level. Best performance will be obtained for  
7

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