NJM4558ISO8X CADEKA [Cadeka Microcircuits LLC.], NJM4558ISO8X Datasheet - Page 9

• Manufacturer Part Number: NJM4558ISO8X
• Description: Dual 4V to 36V Amplifier
• Manufacturer: CADEKA [Cadeka Microcircuits LLC.]

Data Sheet
Application Information
Basic Operation
Figures 1, 2, and 3 illustrate typical circuit configurations for
non-inverting, inverting, and unity gain topologies for dual
supply applications. They show the recommended bypass
capacitor values and overall closed loop gain equations.
©2008-2010 CADEKA Microcircuits LLC
Input
Input
Input
Figure 1. Typical Non-Inverting Gain Circuit
Figure 2. Typical Inverting Gain Circuit
R
R
1
g
+
-
R
Figure 3. Unity Gain Circuit
+
-
+V
g
-V
+V
-V
+
s
-
s
s
s
+V
-V
6.8μF
0.1μF
0.1μF
6.8μF
6.8μF
0.1μF
0.1μF
6.8μF
s
s
6.8μF
0.1μF
0.1μF
6.8μF
R
f
G = - (R
For optimum input offset
voltage set R
G = 1
R
f
G = 1 + (R
R
f
/R
L
g
Output
R
)
1
L
= R
Output
R
f
L
|| R
f
/R
Output
g
g
)
Power Dissipation
Power dissipation should not be a factor when operating
under the stated 2k ohm load condition. However, ap-
plications with low impedance, DC coupled loads should
be analyzed to ensure that maximum allowed junction
temperature is not exceeded. Guidelines listed below can
be used to verify that the particular application will not
cause the device to operate beyond it’s intended operat-
ing range.
Maximum power levels are set by the absolute maximum
junction rating of 150°C. To calculate the junction tem-
perature, the package thermal resistance value Theta
(Ө
T
Where T
In order to determine P
needs to be subtracted from the total power delivered by
the supplies.
P
Supply power is calculated by the standard power equa-
tion.
P
V
Power delivered to a purely resistive load is:
P
The effective load resistor (Rload
the effect of the feedback network. For instance,
Rload
R
These measurements are basic and are relatively easy to
perform with standard lab equipment. For design purpos-
es however, prior knowledge of actual signal levels and
load impedance is needed to determine the dissipated
power. Here, P
P
Quiescent power can be derived from the specified I
ues along with known supply voltage, V
D
supply
load
D
Junction
supply
L
JA
= P
|| (R
= P
) is used along with the total die power dissipation.
= ((V
eff
supply
Quiescent
= V
= V
Ambient
f
= T
in figure 3 would be calculated as:
+ R
LOAD
supply
S+
Ambient
- P
g
)
- V
is the temperature of the working environment.
D
)
load
+ P
RMS
× I
can be found from
S-
Dynamic
+ (Ө
2
RMS supply
)/Rload
D
JA
, the power dissipated in the load
× P
- P
eff
Load
D
)
eff
) will need to include
Supply
www.cadeka.com
. Load power
S
val-
9
JA