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MAX2620EVKIT Datasheet(PDF) 3 Page - Maxim Integrated Products

Part No. MAX2620EVKIT
Description  Evaluation Kit
Download  4 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX2620EVKIT Datasheet(HTML) 3 Page - Maxim Integrated Products

  MAX2620EVKIT Datasheet HTML 1Page - Maxim Integrated Products MAX2620EVKIT Datasheet HTML 2Page - Maxim Integrated Products MAX2620EVKIT Datasheet HTML 3Page - Maxim Integrated Products MAX2620EVKIT Datasheet HTML 4Page - Maxim Integrated Products  
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out. Use the test port provided on the MAX2620 EV kit
to facilitate measurement by installing a 1000pF capac-
itor at C2 and removing C5. (Remove C2 and install C5
to use the MAX2620 as an oscillator.) When using the
test port, subtract an approximately 586ps electrical
delay from the S11 measurement (this delay can be
compensated for on most modern vector network ana-
lyzers) to account for the delay of the transmission line
from the test port to the MAX2620 TANK pin. The test
port should provide a negative input resistance and
thus return gain when S11 is measured on a vector net-
work analyzer. This return gain provides measurement
data that is outside the unit circle of the Smith chart.
A useful technique is to configure the vector network ana-
lyzer to display 1/S11 for this measurement. The vector
network analyzer displays the information inside the unit
circle of the Smith chart. Most modern vector network
analyzers perform this conversion. Input-impedance data
presented in this format (1/S11) is the complement of the
input impedance, which is the impedance desired to pro-
vide the MAX2620 with feedback to oscillate at a particu-
lar frequency. The
Typical Operating Characteristics sec-
tion of the MAX2620 data sheet contains a plot of 1/S11
for specific values of C3 and C4 provided in the
MAX2620 EV kit. Also refer to the
Tank Circuit Design
section in the MAX2620 data sheet.
The MAX2620 EV kit uses a low-voltage varactor. With
the coupling capacitor C17 kept small, the oscillator cir-
cuit is less affected by losses in the varactor. However,
keeping C17 small also reduces overall tuning range.
L1 on the MAX2620 is a ceramic coaxial resonator,
which provides the best phase-noise performance. For
cost-sensitive applications, the layout for L1 on the
MAX2620 EV kit is a dual pad that accepts either a
spring coil or a ceramic coaxial resonator. When prop-
erly specified, coaxial resonators provide tight toler-
ance inductance at very high Q for best circuit perfor-
mance. Spring coils, such as Coilcraft mini-spring coils,
provide a good cost/performance compromise for cost-
sensitive applications.
_____________Layout Considerations
The MAX2620 EV kit can serve as a guide for your
board layout. To minimize the effects of parasitic ele-
ments, which may alter circuit performance, remove the
ground plane around and under the components that
make up the resonant circuit (C3–C6, C17, D1, and L1).
Keep PC board trace lengths as short as possible to
minimize parasitic inductance. Also keep decoupling
capacitors C1, C7, and C9 as close to the MAX2620 as
possible, with direct connection to the ground plane.
MAX2620 Evaluation Kit
_______________________________________________________________________________________
3
C13
1.5pF
C14
OPEN
C12
1000pF
C9
1000pF
L3
10nH
R4
OPEN
50
50
C11
OPEN
C10
1000pF
L4
OPEN
R5
51
MAX2620
U1
OUT
8
1
2
3
4
7
6
5
VCC1
VCC
VCC
C8
1000pF
R1
10
C1
1000pF
C2
OPEN
50
C17
1.5pF
L1
C6
1pF
C5
1.5pF
C3
2.7pF
C4
1pF
R3
10
VCC
VCC
VCC
GND
C15
10
µF
25V
SHDN
1
2
3
C7
1000pF
J1
D1
R2
1k
JU1
SMA
SMA
TEST
PORT
OUT
OUT
VCONT
TANK
FDBK
SHDN
VCC2
GND
OUT
SMA
VCC
SMA
Figure 1. MAX2620 EV Kit Schematic


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