MAX2602EVKIT Maxim Integrated Products, MAX2602EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX2602EVKIT
• Description: RF Modules & Development Tools MAX2602 EVAL KIT MAX2602 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX2602EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The RF output is taken from pin 8 and is not at 50Ω
impedance, so a matching network is required. The
matching network consists of a shunt capacitor at the
collector (C3), a DC-blocking capacitor (C7), a 50Ω
transmission line (T2), and a shunt capacitor (C2).
To evaluate the MAX2602 without the biasing diode
(functionally equivalent to the MAX2601), the 0Ω resis-
tor (R3) must be removed, and the 430Ω resistor (R1)
must be replaced by a 0Ω resistor (a short) (Figure 2).
Now an external bias voltage may be connected to the
EV kit’s V
nected, so the EV kit will not work without an external
biasing voltage. To avoid damage to the MAX2602 in
Figure 2. MAX2602 EV Kit Schematic Without the Bias Diode
IN
B
input. The biasing diode is no longer con-
V
B
0.1 F
C9
2pF
C1
_______________________________________________________________________________________
Without the Biasing Diode
Output Matching Network
Evaluating the MAX2602
1000pF
C5
T1
0
R1
1000pF
C6
100nH
12pF
C4
L1
C11
1000pF
R2
24
4
5
MAX2602 Evaluation Kit
this mode, be sure to turn the V
V
off first and then the V
ranging from 0V to 0.85V are typically used.
For best results, use the MAX2602 EV kit as a layout
guide. The most critical connection is the emitter-
ground contact on the MAX2602’s bottom side. On the
EV kit, this contact is made through a large (0.1 inch,
2.5mm diameter) plated through-hole in the board,
located directly under the part. This contact must be
soldered directly to a large ground plane, as it is the
principal path for heat dissipation, as well as the low-
inductance emitter ground. The MAX2602 EV kit uses
its ground plane as the heatsink.
_____________Layout Considerations
B
3
supply. When turning the part off, turn the V
U1
C12
1000pF
2, 6, 7
BACK-SIDE SLUG
18.5nH
1
8
L2
1000pF
C7
1000pF
C8
C3
10pF
C
0.1 F
T2
supply. External bias voltages
C10
C
supply on before the
C2
2pF
V
C
OUT
B
supply
3