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VCA824IDG4 Datasheet(PDF) 31 Page - Texas Instruments

Part No. VCA824IDG4
Description  Ultra-Wideband, > 40-dB Gain Adjust Range, Linear in V/V Variable Gain Amplifier
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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VCA824IDG4 Datasheet(HTML) 31 Page - Texas Instruments

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MaximumT =+85 C+(0.449W
80 C/W)=120.8 C
°
´
°
°
J
P =10V(38.5mA)+5 /(4
100 )=447.5mW
´
W
D
2
T =T +P
´ q
J
D
JA
A
VCA824
www.ti.com
SBOS394D – NOVEMBER 2007 – REVISED JANUARY 2016
11.2 Layout Example
Figure 78. Layout Recommendation
11.3 Thermal Considerations
The VCA824 does not require heatsinking or airflow in most applications. The maximum desired junction
temperature sets the maximum allowed internal power dissipation as described in this section. In no case should
the maximum junction temperature be allowed to exceed 150°C.
Operating junction temperature (TJ) is given by Equation 12:
(12)
The total internal power dissipation (PD) is the sum of quiescent power (PDQ) and additional power dissipated in
the output stage (PDL) to deliver load power. Quiescent power is simply the specified no-load supply current
times the total supply voltage across the part. PDL depends on the required output signal and load; for a
grounded resistive load, however, it is at a maximum when the output is fixed at a voltage equal to one-half of
either supply voltage (for equal bipolar supplies). Under this worst-case condition, PDL = VS
2/(4 × R
L), where RL
is the resistive load.
Note that it is the power in the output stage and not in the load that determines internal power dissipation. As a
worst-case example, compute the maximum TJ using a VCA824ID (SO-14 package) in the circuit of Figure 75
operating at maximum gain and at the maximum specified ambient temperature of 85°C.
(13)
(14)
This maximum operating junction temperature is well below most system level targets. Most applications should
be lower because an absolute worst-case output stage power was assumed in this calculation of VCC/2, which is
beyond the output voltage range for the VCA824.
Copyright © 2007–2016, Texas Instruments Incorporated
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