P2602 ETAL [ETAL Group], P2602 Datasheet - Page 3

• Manufacturer Part Number: P2602
• Description: LINE MATCHING TRANSFORMER
• Manufacturer: ETAL [ETAL Group]

600
Figure 3 gives flat RX and TX responses against the
CTR21 complex reference impedance (typically
around ±0.5dB 300Hz - 3.4kHz). Return loss is
typically better than 20dB.
parentheses give optimum flatness at a small
sacrifice in return loss.
For circuits with existing board drillings, figure 4
gives good return loss (>20dB) and RX flatness
against the CTR21 complex reference impedance,
but TX flatness is degraded by the use of this
topology.
ETALDOC 258/8
MATCHING RECOMMENDATIONS
CONSTRUCTION
* If return loss > 16dB, 300Hz - 4kHz is ac ceptable, bloc king
Recommended Circ uit
F ig. 2
capacitor may be relaxed to 4.7 F
600
halves of the tapped winding will not be
greater than 5Ω.
Ω
LINE
MATCH
6.8 F
e
μ
2
+ 50%
_
20%
+ _
27nF
*
5%
μ
The circuit values in
+ 50%
_
20%
+ _
33nF
5%
+ _
560
Page 3 of 4
2%
EUROPEAN CTR21 COMPLEX MATCH
Recommended Circ uit
F ig. 4
F ig. 3
270
270
LINE
LINE
150nF
150nF
750
750
2.2 F
56nF
2.2 F
68nF
330
μ
μ
P2602
February 2006
27nF
(150nF)
100nF
(680)
750
(220)
820
150