EL4390CM ELANTEC [Elantec Semiconductor], EL4390CM Datasheet - Page 4

• Manufacturer Part Number: EL4390CM
• Description: Triple 80 MHz Video Amplifier with DC Restore
• Manufacturer: ELANTEC [Elantec Semiconductor]

These numbers represent the worst case bias current and the worst case charging current Note that to
get the full (2mA
Note that the magnitude of the bias current will decrease as temperature increases
The basic droop formula is
and the basic charging formula is
Where I
EL4390C
Triple 80 MHz Video Amplifier with DC Restore
V (droop)
V (charge)
I
OUT
OUT
e
(Clamp voltage
is
e
e
Table 1 Charge Storage Capacitor Value vs Droop and Charging Rates
I
B
I
a
OUT c
a
) charging current the clamp input must have
c
Cap Value
(Line time
Charge time
(nF)
100
220
10
22
47
b
IN
a
b
voltage)
Charge time)
60 S (mV)
Droop in
capacitor value
13 6
1 36
6 4
3 0
30
120
4
Charge in
capacitor value
2 S (mV)
400
182
85
40
18
l
Charge in
250mV of error voltage
4 S (mV)
800
364
170
80
36