el2227c ETC-unknow, el2227c Datasheet - Page 13

• Manufacturer Part Number: el2227c
• Description: Dual Very Noise Amplifier
• Manufacturer: ETC-unknow

Disable Function
The EL2227C is in the standard dual amplifier package
without the enable/disable function. A simple way to
implement the enable/disable function is depicted
below. When disabled, both the positive and negative
supply voltages are disconnected (see Figure 2 below.)
Power Dissipation
With the wide power supply range and large output drive
capability of the EL2227C, it is possible to exceed the
150°C maximum junction temperatures under certain
load and power-supply conditions. It is therefore impor-
tant to calculate the maximum junction temperature
(T
ply voltages, load conditions, or package type need to be
modified for the EL2227C to remain in the safe operat-
ing area. These parameters are related as follows:
where:
where:
JMAX
PD
pation of each amplifier in the package (PD
PD
T
PD
MAX
MAXTOTAL
MAX
75k
MAX
) for all applications to determine if power sup-
=Maximum Ambient Temperature
for each amplifier can be calculated as follows:
=
T
JMAX
2 V
10k
1k
S
is the sum of the maximum power dissi-
=
T
I
SMAX
MAX
1k
1k
10k
+
+
+12V
V
JA
S
+
-
–
PD
V
OUTMAX
MAXTOTAL
1µF
1µF
V
----------------------------
MAX
OUTMAX
R
L
)
4.7µF
13
To serve as a guide for the user, we can calculate maxi-
mum allowable supply voltages for the example of the
video cable-driver below since we know that T
150°C, T
ple) that we are driving a back-terminated video cable,
then the maximum average value (over duty-cycle) of
V
seen in Table 1.
Table 1
Single-Supply Operation
The EL2227C have been designed to have a wide input
and output voltage range. This design also makes the
EL2227C an excellent choice for single-supply opera-
tion. Using a single positive supply, the lower input
voltage range is within 200mV of ground (R
and the lower output voltage range is within 875mV of
ground. Upper input voltage range reaches 3.6V, and
output voltage range reaches 3.8V with a 5V supply and
R
single 5V supply. This wide output voltage range also
allows single-supply operation with a supply voltage as
high as 28V.
Gain-Bandwidth Product and the -3dB
Bandwidth
The EL2227C have a gain-bandwidth product of
137MHz while using only 5mA of supply current per
amplifier. For gains greater than 2, their closed-loop
-3dB bandwidth is approximately equal to the gain-
EL2227CS
EL2227CY
JA
L
OUTMAX
PD
V
I
V
Application
R
MAX
s are shown in Table 1. If we assume (for this exam-
= 500 . This results in a 2.625V output swing on a
JA
Part
L
S
OUTMAX
MAX
=Supply Voltage
=Load Resistance
=Thermal Resistance of the Package
=Maximum Supply Current of 1 Amplifier
MAX
=Maximum Power Dissipation of 1 Amplifier
is 1.4V, and R
=Maximum Output Voltage Swing of the
Package
MSOP8
= 75°C, I
SO8
Dual Very Low Noise Amplifier
SMAX
160°C/W
206°C/W
L
JA
= 150 , giving the results
= 9.5mA, and the package
0.406W @ 85°C
0.315W @ 85°C
EL2227C
Max PD
T
MAX
ISS
@
L
= 500 ),
JMAX
Max V
----
S
=