+5V and GND on the circuit board. Connect a 50鈩?/div>
signal source to INPUT and terminate OUTPUT with
a spectrum analyzer or network analyzer having a
50鈩?input impedance. If using a signal source with
a source impedance other than 50鈩? or if a different
input impedance is required, be sure to replace
resistor R1 with the appropriate value resistor.
2) Connect a 25-pin male-to-male cable between the
parallel (printer) port of the PC and the 25-pin
female connector on the EV kit board. Ensure that
shunts are placed on jumpers JU5, JU6, and JU7.
These shunts connect the appropriate pins of the
DB25 connector to the serial data interface of the
MAX3510. Also check that pins 2 and 3 of jumper
JU3 and pins 1 and 2 of jumper JU1 are shunted.
3) Turn on the power supply. Turn on the PC and the
test equipment. Set the signal source for -13dBm
(34dBmV across a 50鈩?load).
4) Run the software program.
If your PC has Windows 95 installed, read the file
READWIN3510.TXT for instructions on operation of the
MAX3510.EXE file. If your PC does not have Windows
95 installed, use the program MAX3510.BAS.
Instructions for the QuickBasic program are found in
READ3510.TXT.
Gain Adjustment
Valid gain states range from 0 to 63. The nominal
change in gain is 1dB per gain state. Gain states are
set exclusively by programming the SDI. See the
MAX3510 data sheet for details.
Shutdown and Transmit Enable
Jumpers JU1 and JU3 determine how the shutdown
and transmit-enable features are controlled. Pin 2 of
each of these jumpers is connected directly to the
device. If an external source (such as a modulator chip
or microprocessor) is used to control these features,
simply make the connection to pin 2 of the appropriate
jumper. Pads are provided on the bottom side of the
board (R18 and R19, respectively) for placement of ter-
mination resistors, if needed.
If manual control of shutdown and transmit-enable is
desired, shunt pins 2 and 3 of jumper JU1 and pins 1
and 2 of jumper JU3. This will allow
SHDN
and TXEN to
be controlled by JU2 and JU4, respectively. JU2 and
JU4 are used to place either +5V or ground at
SHDN
or
TXEN. Pin 3 of these jumpers is ground and pin 1 is +5V.
Detailed Description
Using the Software
The MAX3510 uses a serial data interface (SDI) to set
gain and to control software-shutdown mode. Some
means of communicating with the SDI is required to use
the MAX3510 EV kit. A microprocessor, pattern genera-
tor, or PC can be used for this function. Software is
included in this EV kit to facilitate the use of a PC.
The disk included with the MAX3510 EV kit contains two
programs. The first is a QuickBasic
廬
program that runs
under DOS and the second is an EXE file that requires
Windows 95
廬
to run. The disk contains two directories
(Table 1).
Quick Basic and Windows 95 are registered trademarks of
Microsoft Corp.
2
Manual Control of Serial Data Interface
If using a source other than a PC to drive the serial data
interface of the MAX3510 EV kit (such as a digital pat-
tern generator or microprocessor), remove the shunts
on jumpers JU5, JU6, and JU7. Access to the serial
data interface is available through these jumpers. See
the MAX3510 data sheet for a description of the serial
data interface.
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