ACA2604 Datasheet, PDF (9/18 Pages) ANADIGICS, Inc – Fiber-to-the-Home RF Amplifier

ACA2604
Performance data on this page measured using application circuit with input photodiode, as shown in Figure 15.
Figure 8: Gain Flatness to Best Fit Line Over Temperature
(VCC = + 5 V, VAGC = +1.6 V)
2
1.5
1
0.5
0
0
-0.5
+85C
+25C
100
200
300
400
500
600
700
800
900
1000
-40C
-1
-1.5
-2
Frequency (MHz)
Table 6: Gain Flatness to Best Fit Line
(VAGC = +1.6 V)
Temp (^oC)
Tilt (dB)
Flatness (dB)
85
4.1
0.5
25
4.5
0.7
-40
5.1
0.8
The best fit line is calculated
using the least mean squares
method:
y = m⋅x+b
m
=
∑
(x ⋅ y)−
∑^{x2 −}
∑^xâ‹âˆ‘
n
(_∑ x)²
n
y
b= ^∑y −m⋅^∑x
n
n
Data Sheet - Rev 2.1
9
11/2008