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参数资料
| 型号： | MAX2039EVKIT |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Evaluation Kit |
| 中文描述： | MAX2039评估板 |
| 文件页数： | 3/7页 |
| 文件大小： | 210K |
| 代理商： | MAX2039EVKIT |
Detailed Description
The MAX2039 is a high-linearity up/downconverter inte-
grated with RF and LO baluns, an LO buffer, and an
SPDT LO input select switch. The EV kit circuit uses the
MAX2039 and consists mostly of supply-decoupling
capacitors, DC-blocking capacitors, a current-setting
resistor, and an IF balun. The MAX2039 EV kit circuit
allows for thorough analysis and a simple design-in.
Supply-Decoupling Capacitors
Capacitors C2, C6, C7, and C8 are 22pF supply-decou-
pling capacitors used to filter high-frequency noise.
Capacitors C3, C9, and C11 are larger 0.01μF used for
filtering lower frequency noise on the supply.
DC-Blocking Capacitors
The MAX2039 has internal baluns at the RF and LO
inputs. These inputs have almost 0
resistance at DC,
and so DC-blocking capacitors C1, C10, and C12 are
used to prevent any external bias from being shunted
directly to ground.
LO Bias
Bias current for the integrated LO buffer is set with
resistor R1 (549
, ±1%). The DC current of the device
can be reduced by increasing the value of R1 but the
device would operate at reduced performance levels
(see the
Modifying the EV Kit
section).
Tap Network
Capacitor C5 helps to terminate the second-order inter-
modulation products.
IF±
The MAX2039 mixer has an IF frequency range of DC
to 350MHz. Note that these differential ports are ideal
for providing enhanced IIP2 performance. Single-
ended IF applications require a 1:1 balun to transform
the 50
differential output impedance to a 50
single-
ended output. After the balun, the IF return loss is bet-
ter than 15dB. The differential IF is used as an input
port for upconverter operation. The user can use a dif-
ferential IF amplifier following the mixer, but a DC block
is required on both IF pins. In this configuration, the IF+
and IF- pins need to be returned to ground through a
high resistance (about 1k
). This ground return can
also be accomplished by grounding the RF tap (pin 3)
and AC coupling the IF+ and IF- ports (pins 19 and 18).
LOSEL
The EV kit includes a 47k
pullup resistor (R2) for easy
selection of the LO port. Providing a ground at TP3
selects LO1, and leaving TP3 open selects LO2. To
drive TP3 from an external source, follow the limits
called out in the MAX2039 device data sheet. Logic
voltages should not be applied to LOSEL without the
+5V supply voltage. Doing so can cause the on-chip
ESD diodes to conduct and could damage the device.
Layout Considerations
The MAX2039 evaluation board can be a guide for your
board layout. Pay close attention to thermal design
and close placement of components to the IC. The
MAX2039 package exposed paddle (EP) conducts
heat from the device and provides a low-impedance
electrical connection to the ground plane. The EP must
be attached to the PC board ground plane with a low
thermal and electrical impedance contact. Ideally, this
is achieved by soldering the backside of the package
directly to a top metal ground plane on the PC board.
Alternatively, the EP can be connected to an internal or
bottom-side ground plane using an array of plated vias
directly below the EP. The MAX2039EV kit uses nine
evenly spaced 0.016in-diameter, plated through holes
to connect the EP to the lower ground planes.
Depending on the ground-plane spacing, large sur-
face-mount pads in the IF path may need to have the
ground plane relieved under them to reduce parasitic
shunt capacitance.
Modifying the EV Kit
The RF, LO, and IF ports are broadband matched, so
there is no need to modify the circuit for use anywhere
in the 1700MHz to 2200MHz RF range, 1400MHz to
2000MHz LO range, and 50MHz to 350MHz IF range.
The DC current of the device can be reduced if reduced
performance is acceptable. Reducing the current is
accomplished by increasing the value of R1. Doubling
the value of R1 cuts the DC current approximately in
half. Approximately 10% of the overall IC current is
used for housekeeping (R1 set at 549
) and cannot be
reduced.
E
MAX2039 Evaluation Kit
_______________________________________________________________________________________
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| MAX203CPP | 功能描述:RS-232接口集成电路 5V RS-232 Tcvr w/0.1uF External Cap RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX203CPP+ | 制造商:Maxim Integrated Products 功能描述:Dual Transmitter/Receiver RS-232 20-Pin PDIP N Bulk |
| MAX203CPP+G36 | 功能描述:RS-232接口集成电路 5V RS-232 Tcvr w/0.1uF External Cap RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX203CWP | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX203CWP+ | 制造商:Maxim Integrated Products 功能描述:Dual Transmitter/Receiver RS-232 20-Pin SOIC W Bulk |
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