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參數(shù)資料
| 型號： | RF3322 |
| 廠商： | RF MICRO DEVICES INC |
| 元件分類： | 衰減器 |
| 英文描述： | CABLE REVERSE PATH PROGRAMMABLE GAIN AMPLIFIER |
| 中文描述： | 5 MHz - 65 MHz RF/MICROWAVE NARROW BAND LOW POWER AMPLIFIER |
| 封裝： | QSOP-20 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 169K |
| 代理商： | RF3322 |
Preliminary
3-37
RF3322
Rev A2 010518
3
L
A
Shutdown Enable
Shutdown enable can be set to be “continuous on”
(chip enabled) by placing the SHDN jumper in the
right-hand 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 associated GND/VCC jumper in the “GND” posi-
tion. If a computer controlled signal is used (J1), place
the SHDN jumper in the left-hand position.
V
CC
Settings
V
CC1
should be set to 5.0V
DC
.
Evaluation Board Setup
Equipment Needed
Signal Generator
Spectrum Analyzer
Power Supply (5.0V@300mA)
RF3322 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 “RF3322”.
Unzip the file using WinZip 7.0 or higher (http://
www.winzip.com). Unzip to a temporary directory and
run RF3322.exe.
The 7-bit Gain Control Word (GCW) in the data latch
determines the gain setting in the RF3322. The gain
control data (SDA) load sequence is initiated by a fall-
ing edge on CS. The SDA is serially loaded (MSB 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 (RF3322.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 (0-58) 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_3322.txt file for proper pin/signal mapping
for the 25 pin interface.
ContinuousON
A
SHDN
GND
VCC
Continuous OFF
B
SHDN
GND
VCC
SoftwareControlled
C
SHDN
GND
VCC
Figure 2. SHDN Enable Configuration
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