MAX2683/MAX2684 Evaluation Kits
2) RF Signal Source: Set one signal generator to an
300MHz for the MAX2683 EV kit and 0.8dB at 900MHz
for the MAX2684 EV kit.
RF frequency of 3.6GHz at an output power level of
-20dBm. Turn the output of the signal generator off.
Connect the signal generator to the RF port SMA
connector using a 50Ω SMA cable.
Detailed Description
This section describes the circuitry surrounding the
MAX2683/MAX2684 EV kits. Figure 1 is the schematic
for the MAX2683/MAX2684 EV kits as assembled. For
more detailed information covering device operation,
refer to the MAX2683/MAX2684 data sheet.
3) LO Signal Source: The MAX2683/MAX2684 can be
configured for full- or half-frequency operation of
the external LO signal source. As assembled, the
MAX2683/MAX2684 EV kits are configured for half-
frequency operation of the LO signal source. The
half-frequency LO port, LOX2, is coupled to the
MAX2683/MAX2684 EV kit LO port SMA connector,
while the LOX1 port is left unconnected.
RF Input
The RFIN port of the MAX2683/MAX2684 is internally
biased and requires a DC-blocking capacitor, as well as
a matching network for optimum power transfer.
Capacitor C1 functions as a DC block, while inductor L1
and capacitor C2 function as a matching network, tuning
the RF input of the device for maximum gain at 3.6GHz.
To evaluate the devices with the LO doubler
enabled, be sure jumper JU1 is shorted to GND
(ENX2 = GND). Set the LO signal generator output
power to -5dBm at a frequency of 1650MHz
(MAX2683) or 1350MHz (MAX2684). Turn the out-
put of the signal generator off. Connect the signal
generator to the LO port SMA connector using a
50Ω SMA cable.
Evaluation of the devices with full-frequency opera-
tion of the LO signal source requires two compo-
nent changes. Remove inductor L5 and leave the
LOX2 port unconnected. Short the unpopulated
pads of resistor R4 with a 0Ω resistor. Disable the
LO frequency doubler by shunting jumper JU1 to
VCC (ENX2 = VCC). Set the LO signal generator
output power to -5dBm, at a frequency of 3300MHz
(MAX2683) or 2700MHz (MAX2684). Turn the out-
put of the signal generator off. Connect the signal
generator to the LO port SMA connector using a
50Ω SMA cable.
LO Input and LO Frequency
Doubler Control
The MAX2683/MAX2684 include a logic-level-enabled
LO frequency doubler. Jumper JU1 controls the LO
doubler. A logic-level low on the ENX2 pin enables the
frequency doubler, and the external LO signal source
operates at half frequency. A logic-level high on the
ENX2 pin disables the frequency doubler, and the
external LO signal source operates at full frequency.
Half-frequency LO signals are applied to the LOX2
port, while full-frequency LO signals are applied to the
LOX1 port. Both ports are internally biased and require
a DC-blocking capacitor. The unused LO port should
be left unconnected.
The MAX2683/MAX2684 EV kits, as assembled, are con-
figured for operation of the LO signal source at half fre-
quency. Capacitor C6 functions as a DC block, while
inductor L5 improves the return loss of the port. The LOX1
port is left unconnected for half-frequency operation.
4) Spectrum Analyzer: Connect the spectrum analyz-
er to the IF port SMA connector using a 50Ω SMA
cable. Set the center frequency of the spectrum
analyzer to 300MHz (MAX2683) or 900MHz
(MAX2684). Set the reference level of the spectrum
analyzer to -10dBm and the span to 1MHz.
To evaluate the device with full-frequency operation of
the LO source, remove inductor L5 and leave the LOX2
port unconnected (Figure 2). Short resistor R4 with a
0Ω resistor. Capacitor C6 now functions as the DC
block for the LOX1 port.
Analysis
Turn on the power supply and RF and LO signal gener-
ators. The ammeter should read approximately 55mA
with the LO doubler enabled (ENX2 = GND) or 40mA
IF Output
The MAX2683/MAX2684 incorporate differential, open-
collector IF output ports for use in either differential or
single-ended applications. To ease evaluation of the
devices, the MAX2683/MAX2684 EV kits utilize a balun
to convert the differential signal to a single-ended sig-
nal compatible with 50Ω test equipment. The IF output
of the MAX2683 is tuned for an IF frequency of
300MHz, while the IF output of the MAX2684 is tuned
for an IF frequency of 900MHz. Inductors L3 and L4
provide DC biasing and impedance matching of the
with the LO doubler disabled (ENX2 = V ). If evaluat-
CC
ing the MAX2683, the spectrum analyzer should show
an output power of approximately -14dBm at a center
frequency of 300MHz. If evaluating the MAX2684, the
output power should read approximately -20dBm at a
center frequency of 900MHz. Be sure to take into
account cable, board, and balun losses when calculat-
ing power gain. Typical balun losses are 0.3dB at
_______________________________________________________________________________________
3
5秒后页面跳转
深入解析CS8416引脚说明、参数、技术特点
TPA3116D2功放芯片参数详解、引脚说明
移位寄存器74HC165引脚说明、驱动程序示例解读
深入解析AD9833：DDS频率合成器的卓越性能与广泛应用
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
技术参数
数据手册
如果您发现信息不准确，
