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SX061 Schematic ( PDF Datasheet ) - AMI

Teilenummer SX061
Beschreibung 1 Mbit/s DQPSK/DBPSK Digital Demodulator
Hersteller AMI
Logo AMI Logo 




Gesamt 22 Seiten
SX061 Datasheet, Funktion
www.DataSheet4U.com
WavePlex
SX061
1 Mbit/s DQPSK/DBPSK
Digital Demodulator
Table of Contents
User’s Manual
General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Functional Description of the SX061 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pin Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Description of Individual Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Serial Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
The PLL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
The AD Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
The AGC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
The AGC in Slip Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
The NCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
The I&D Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
The Demodulating DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Detecting Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Carrier Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Generating RSSI1 and RSSI2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Triggering the Demodulating DSP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Designing a Link Using the SX061 and the SX043/42 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
1. Specify Link Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2. Setup the SX043 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3. Setup the Internal Clocks on the SX061 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4. Setup the AGC Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. Setup the Internal IF Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6. Setup the RSSI Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7. Synchronizing the Receiver: Slip Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8. Synchronizing the Receiver: Track Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9. Setup the Carrier Tracking Loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
10. Setup the Data Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
11. Optimization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
1






SX061 Datasheet, Funktion
SX061
1Mbit/s DQPSK/DBPSK
Digital Demodulator
User’s Manual
Figure 4: Pin Layout
WavePlex
6

6 Page









SX061 pdf, datenblatt
SX061
1Mbit/s DQPSK/DBPSK
Digital Demodulator
WavePlex
User’s Manual
The NCO
The Numerical Controlled Oscillator generates the
internal LO frequency at I and Q. The outputs of the NCO
are 4-bit words, representing a sine and a cosine at the
IF-frequency.
The frequency of the NCO, FNCO, is set using a 16-bit
word. This word is generated by the demodulating DSP. It
consists of a frequency offset Foffset word plus an
additional term Ftrack from the demodulating DSP to lock
on the incoming signal. This term Ftrack is generated by
the demodulating DSP and does not have to be set by the
user (See Demodulating DSP).
So,
FNCO=Foffset + Ftrack.
The frequency setting word FOFFSET can be
programmed using the 16-bit register FOFFSET of the
programming string. The offset frequency of the NCO is
related to this word as shown below:
Foffset= FOFFSET * Fclk/217.
Note: The highest attainable IF frequency for a given internal clock
frequency is Fclk/4. When higher IF frequencies are needed, a
higher Fclk has to be chosen.
For the calculation of Fclk see the PLL section (page 9).
The I&D Filters
The internal I&D filters accumulate the output of the
multiplication of the samples and the NCO I- and Q-
output.
Each time a DUMP from the SX043 occurs, the content of
the I&D filter is passed to the demodulating DSP. From
this moment on the I&D filter outputs are referred to as X1
and Y1.
At the same time the internal value of the I&D is set to 0.
The first operation of the DSP is dividing X1 and Y1 by 2n.
The number n can be set using the 4-bit I&D_gain
register of the programming string.
Inter Symbol Interference (ISI) can be minimized by
controlling the delay and the length of the DUMP signal.
As long as the DUMP signal is high the I&D filters do not
accumulate. The DUMP length and delay can be
controlled using the DMP register on the SX043.
The Demodulating DSP
The demodulating DSP performs three tasks:
• Detecting the data
• Carrier tracking
• Generating the RSSI signals
Detecting Data
There are three different ways of data demodulation.
These can be selected by setting the mode register,
which is described in Table 4.
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