參數(shù)資料
型號： MAX999
廠商： Maxim Integrated Products, Inc.
英文描述： Low-Noise.Precision Op Amp[MXL1007/MXL1007ACN8/MXL1007AMH/MXL1007AMJ8/MXL1007CN8/MXL1007CS/MXL1007CS-T/MXL1007CS8/MXL1007CS8-T/MXL1007MH/MXL1007MJ8 ]
中文描述： 單/雙/四路、超高速、+3V/+5V、超擺幅比較器
文件頁數(shù)： 2/8頁
文件大?。?/td> 315K
代理商： MAX999
E
MAX9981 Evaluation Kit
2
_______________________________________________________________________________________
Quick Start
The MAX9981 EV kit is fully assembled and factory test-
ed. Follow the instructions in the
Connections and
Setup
section for proper device evaluation.
Test Equipment Required
Table 1 lists the equipment required to verify the opera-
tion of the MAX9981 EV kit. It is intended as a guide
only, and some substitutions can be made.
Connections and Setup
This section provides a step-by-step guide for testing
the basic functionality of the EV kit. As a general pre-
caution to prevent damaging the outputs by driving
high-VSWR loads,
do not turn on DC power or RF
signals until all connections are made.
This procedure is specific to operation with an RF input
frequency range of 825MHz to 915MHz, low-side injected
LO for a 100MHz IF. Choose the test frequency based on
the particular system
’
s frequency plan, and adjust the
following procedure accordingly. See Figure 1 for the
main mixer test setup diagram.
1) Calibrate the power meter for 870MHz. For safety
margin, use a power sensor rated to at least
+20dBm, or use padding to protect the power head
as necessary.
2) Connect 3dB pads to DUT ends of each of the
three RF signal generators
’
SMA cables. This
padding improves VSWR and reduces the errors
due to mismatch.
3) Use the power meter to set the RF signal genera-
tors according to the following:
RFMAIN signal source: -5dBm into DUT at
870MHz (approximately -2dBm before the 3dB
pad)
LO1 signal source: 0dBm into DUT at 770MHz
(approximately +3dBm before the 3dB pad)
LO2 signal source: 0dBm into DUT at 771MHz
(approximately +3dBm before the 3dB pad)
4) Disable the signal generator outputs.
5) Connect the RF source (with pad) to RFMAIN.
6) Connect the LO1 and LO2 signal sources to the EV
kit LO inputs.
7) Measure loss in the 3dB pad and the cable that is
connected to IFMAIN. Losses are frequency
dependent, so test this at 100MHz (IF frequency).
Use this loss as an offset in all output power/gain
calculations.
8) Connect this 3dB pad to the EV kit
’
s IFMAIN con-
nector, and connect a cable from the pad to the
spectrum analyzer.
9) Connect a 50
terminator to the unused RF input
and IF output.
10) Set the DC supply to +5.0V, and set a current limit to
around 500mA if possible. Disable the output voltage
and connect supply to the EV kit through a low inter-
nal resistance ammeter. Enable the supply. Re-adjust
the supply to get +5.0V at the EV kit since there will
be a voltage drop across the ammeter when the
mixer is drawing current.
11) Select LO1 by leaving LOSEL (TP3) unconnected
or connecting it to +5V. If left floating, LOSEL will
be pulled high by an on-board pullup resistor.
12) Enable the LO and the RF sources.
To test the diversity mixer, disable the LO and RF
sources, turn off the DC supply and repeat steps 3
through 12, replacing RFDIV for RFMAIN and IFDIV for
IFMAIN. Be sure to terminate RFMAIN and IFMAIN with
50
terminators. See Figure 2 for diversity mixer test
setup.
Testing the Mixer
Adjust the center and span of the spectrum analyzer to
observe the IF output tone at 100MHz. The level should
be about -5.4dBm (2.6dB conversion gain, 3dB pad
loss). The spectrum analyzer
’
s absolute magnitude
accuracy is typically no better than ±1dB; therefore,
use the power meter to get an accurate output power
measurement. There will also be a tone at 99MHz which
is due to the LO signal applied to LO2. The amount of
suppression between the 100MHz and 99MHz signals
is the switch isolation.
Connect LOSEL to GND to select LO2. Observe that
the IF output level at 99MHz increases while the
100MHz level decreases.
EQUIPMENT
HP E3631A
Fluke 75 series II
HP/Agilent 8648B
HP 437B
HP 8561
HP 8482A
3dB pad
50
termination
QTY
1
1
3
1
1
1
4
2
DESCRIPTION
DC power supply
Digital multimeter (ammeter)
RF signal generators
RF power meter
Spectrum analyzer
High-power sensor (power head)
3dB attenuators
50
(1W) terminations
Table 1. Test Equipment Required
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