Preliminary
2-13
RF3321
Rev A10 010516
3
Shutdown Enable
Shutdown enable can be set to be “continuous on”
(chip enabled) by placing the SHDN jumper in the up
position and placing the associated GND/VCC jumper
in the “VCC” position. Shutdown enable can be set to
“continuous off” (chip disabled) by placing the associ-
ated GND/VCC jumper in the “GND” position. If a com-
puter controlled signal is used (J1), place the SHDN
jumper in the down position.
VCC Settings
VCC1 should be set to 5.0VDC.
VCC2 should be set to 7.0VDC.
Evaluation Board Setup
Equipment Needed
•
Signal Generator
•
Spectrum Analyzer
•
Power Supply (5.0 V@300 mA)
•
RF3321 PCBA
•
Serial Cable (included with kit)
•
Standard PC
•
Three-Wire Bus Software
Optional Equipment
•
Variable Low-Pass or Band-Pass Filters
•
Power Meter
•
Second Signal Generator with Modulation for ACPR
and IP2, IP3 Testing
•
Arbitrary Wave Generator
•
Two-Channel Oscilloscope
Software Setup
To install the software, you need a computer with the
following.
•
133MHz Pentium processor
•16MB RAM
•
Hard Drive with 5MB free space
•
Free 25-pin LPT port
•
VGA Monitor
The software may be downloaded from www.rfmd.com
by following these steps.
Select the “Product Support” tab;
Select “Evaluation Board Information”;
Select “RF3321”.
Unzip the file using WinZip 7.0 or higher (http://
www.winzip.com). Unzip to a temporary directory and
run RF3321.exe.
The 7-bit Gain Control Word (GCW) in the data latch
determines the gain setting in the RF3321. The gain
control data (SDA) load sequence is initiated by a fall-
ing edge on CS. The SDA is serially loaded (LSB first)
into the 7-bit shift register at each rising edge of the
clock. While CS is low, the data latch holds the previ-
ous data word allowing the gain level to remain
unchanged. After seven clock cycles the new data
word is fully loaded and CS is switched high. This
enables the data latch and the loaded register data is
passed to the gain control block with the updated gain
value. Also at this CS transition, the internal clock is
disabled, thus inhibiting new serial input data.
Software and Cable
Figure 3 shows the cable configuration. Connect the
cable into the LPT1 port of the computer running the
software. Connect the other end of the cable to the 25-
pin connector of the evaluation board. Executing the
software (RF3321.exe) will produce the screen shown
in Figure 4. The user may set the gain of the evaluation
board by sliding the gain control switch to the desired
gain setting. Pressing the Preset Gain Value buttons
automatically sets the gain of the unit to the value
shown on the button. The Automatic Gain Adjustment
when set to “Cycle” will automatically cycle through all
of the gain steps (0-56) in seconds (at the rate set by
the user). The user may place the unit in sleep, shut-
down and transmit enable/disable modes by checking
the corresponding box. The bit pattern being sent to
the PCBA is shown at the bottom of the screen. See
README_3321.txt file for proper pin/signal mapping
for the 25 pin interface.
Software Controlled
C
GND
VCC
SHDN
Continuous ON
B
SHDN
GND
VCC
Continuous OFF
A
GND
VCC
SHDN
Figure 2. SHDN Enable Configuration
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