SL1710 Mitel Networks Corporation, SL1710 Datasheet - Page 5

• Manufacturer Part Number: SL1710
• Description: Quadrature Downconverter
• Manufacturer: Mitel Networks Corporation

APPLICATION NOTES
the circuit diagram Fig 3. and the PCB layout illustrated in Figs
9 and 10. An alternative oscillator configuration using a SAW
Resonator is shown in the circuit diagram Fig. 11 and the PCB
layout illustrated in Figs 12 and 13. These boards have been
designed to permit the initial evaluation of the SL1710
performance.
VARACTOR TUNED
The tuning range of the oscillator is;
Volt. The inductor L1 is a 12nF surface mount component.
Different VCO centre frequencies and sensitivities can be
achieved by changing the values of L1, C12 and C13.
synthesiser which is programmed via an I
input to the synthesiser is from the SL1710 prescaler outputs
via RF inductors L3 and L4.
These application notes should be read in conjunction with
The application detailed in Fig.3 uses a synthesised VCO.
Varactor line Voltage.
This configuration gives a VCO sensitivity of 1.84MHz/
The VCO frequency is controlled by the SP5611
5 Volts
30 Volts
START 350 MHz
Oscillator Frequency
458MHz
504MHz
+j0.2
–j0.2
0
2
C bus. The
0.2
+j0.5
–j0.5
Fig.4 Typical RF input impedance
0.5
RF
+j1
1
–j1
SAW RESONATOR OSCILLATOR
a SAW Resonator controlled oscillator. In this instance the
frequency accuracy
determined by the Saw Resonator. The PCB detailed in Figs.
12 and 13 is designed to accommodate the following SAWR;
PRESCALER OUTPUTS
prescaler outputs pins 10 and 11. This enables the on board
VCO to be synthesised via a PLL.
VCO DISABLE
VCO Disable (pin 15) to ground and enabled by connecting the
pin to V
AGC
VR1 to read 2.5 volts with respect to V
to the nominal centre of the AGC control curve. The control
voltage applied to pin 1 can be varied between 0.5 Volts
(maximum gain) and V
2
The application detailed in Fig. 11 shows an SL1710 with
Manufacturer
The VCO frequency/32 is available at the differential
The on-chip oscillator can be disabled by connecting the
The DC voltage measured at TP1 should be adjusted using
MURATA
CC
5
via a 4K7 pull up resistor.
+j2
–j2
+j5
–j5
STOP 650 MHz
CC
and stability of the oscillator are
-0.5 Volts minimum gain)
SAR479.45MB10X200
Marker
Zreal
Zimag
Part No
1 480MHz
EE
= 75.7
= –36.4
. this voltage equates
SL1710
5