SA2411 Datasheet, PDF (14/17 Pages) NXP Semiconductors – +20 dBm single chip linear amplifier for WLAN

Philips Semiconductors
+20 dBm single chip linear amplifier for WLAN
Product data
SA2411
12. APPLICATION WITH THE SA2400A
Next diagram is the application of the SA2400A with the SA2411.
The interface is simple. Two equal microstrip lines connect the SA2400A with the SA2411. The length of this connection should be kept to a
minimum.
The supply for the open collectors of the SA2400A is provided via pin 2 of the SA2411.
C2 is for supply voltage decoupling.
V_DD
PWRUP
RF connection
Other connection
16 15 14 13 12 11 10 9
SA2411
12345678
C2
I_detector
3-WIRE BUS
48 47 46 45 44 43 42 41 40 39 38 37
TX_IN_I_P/
AGCRESET
1
AGCSET ₂
TX_DATA_I
36
TX_IN_I_M/
TX_DATA_Q
35
IDCOUT ₃
A_GND
4
SA2400A
TX_IN_Q_P
34
TX_IN_Q_M
33
Figure 25.
NOTE:
A suggested starting point for designing the coupled microstrip lines:
Length = 1/18 λ. Width = 12 mils, Separation = 5 mils with the Dielectric constant = 4.6.
This should result in Z_even = 150 Ω, Z_o = 75 Ω, and Z_odd = 30 Ω.
There should be no ground plane under the microstrip lines.
SR02487
2003 Feb 07
14