SL2017KG Просмотр технического описания (PDF) - Mitel Networks
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SL2017KG Datasheet PDF : 17 Pages
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SL2017
Required VCO
Frequency (MHz)
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
Bottom of Band
Top of Band
Byte 1
Address
C2
C2
C2
C2
C2
C2
C2
C2
C2
C2
C2
C2
Byte2
Prog Divider
8 MSB's
0B
0C
0D
0E
0E
0F
10
11
11
12
XX
XX
Byte 3
Prog Divider
8 LSB's
B8
80
48
10
D8
A0
68
30
F8
C0
XX
XX
Byte 4
Prog Divider
/Reference
Divider
93
93
93
93
93
93
93
93
93
93
93
93
Byte 5
Charge Pump
and Port
Control
40
40
40
40
40
40
40
40
40
40
11
10
Codes above are for Fcomp = 250kHz, prescaler enabled, giving Fstep = 500kHz.
X = Don't care
Table 1. Example I2C Hex codes for SP5659 synthesiser
Switching of SL2017 IF outputs
Port P0 is used to select the IF ouputs.
When Port P0 is OFF, IF output 1 is selected.
When Port P0 is ON, IF output 2 is selected.
Switching of SL2017 AGC
Port P1 is used to program the AGC gain.
When Port P1 is OFF, AGC is set to 4V (minimum gain).
When Port P1 is ON, the AGC is set to 1V (maximum gain).
SL2017 Operation
The output of the preamplifier is fed to the mixer section
where the RF signal is mixed with the local oscillator
frequency.
Signals from the mixer are then fed to the AGC IF amplifier,
which gives an overall conversion gain programmable from
-10 to +30 dB. The output of this stage can be switched to one
of two outputs to facilitate IF processing.
The SL2017 will mix an RF input signal from 950MHz -
2150MHz and produce an IF signal typically at 402.75MHz or
479.5MHz.
The device has a number of features, which may be either
programmable via a synthesiser and operated as part of a
dynamic AGC loop, or hardwired into a fixed mode.
There are a variety of parameters which can be measured
using this evaluation board.
The SL2017 is a downconverter mixer with an AGC
amplifier, which when used with appropriate external varactor
tuned oscillator performs the first IF tuning function for a full
band satellite receiver system.
In application the RF input of the device is interfaced
through appropriate impedance matching to the first IF signal,
which is down linked from the outdoor unit at typically 950-
2150MHz. The RF input preamplifier of the device is designed
for low noise figure and for low distortion so eliminating the
requirement for RF AGC. The preamplifier also provides gain
to the mixer section and back isolation from the local oscillator
signal.
8
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