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PDF SL1710 Data sheet ( Hoja de datos )
| Número de pieza | SL1710 | |
| Descripción | Quadrature Downconverter | |
| Fabricantes | Mitel Networks Corporation | |
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Supersedes October 1996 version in Media IC Handbook HB4599-1.0
SL1710
Quadrature Downconverter
Preliminary Information
DS3842 - 4.1 March 1997
The SL1710 is a quadrature downconverter, intended for
use with both Professional and Consumer Digital Satellite
Applications.
The device contains high linearity, low noise amplifiers,
quadrature mixers, plus an on-chip oscillator, operating
between 350MHz and 500MHz, which may be synthesised via
the differential prescaler outputs.
An AGC with 18dB gain control is provided to cope with a
wide range of input signal levels.
I and Q outputs are via low impedance single ended
amplifiers. These may be connected to a dual channel analog
to digital converter such as the PCA916, VP216, VP215 or
VP213, via a suitable anti-alias filter.
FEATURES
s Wide input frequency range (350-500MHz)
s On chip oscillator with varactor tuning or SAW
resonator operation capability
s Nominal 40dB conversion gain from IF input to I
and Q outputs
s AGC amplifier with 18dB gain control range
s I to Q phase match 90°C to ± 2°, gain match
better than 1dB
s Low impedance I and Q single ended outputs,
with 15MHz ± 1dB BW
s Divide by 32 prescaler outputs
s Suitable for QPSK and up to 64QAM systems
AGC
IOUT
VEEA
IFINB
IFIN
VCCA
QOUT
VEEC
1 16
VCCB
VCODIS
VCO B
VCO A
VEEB
PSCAL
PSCALB
VCCC
Fig. 1 Pin allocation top view
ORDERING INFORMATION
SL1710/KG/MPAS
SL1710/KG/MPAD (Tape and Reel)
MP16
ABSOLUTE MAXIMUM RATINGS
Storage temperature
Junction temperature
Supply voltage
Voltage at any other pin
-55°C to +150°C
-29°C to +150°C
-0.3 to 7.0V
-0.3 to +7.0V
APPLICATIONS
s Consumer digital satellite decoders
s Professional digital satellite decoders
s Communication systems
AGC
IFIN
IFINB
AGC
I OUT
AGC
Q OUT
VCODIS
VCOA
VCOB
LO
0 deg
90 deg
Quadrature
generator
÷32
Fig.2. SL1710 block diagram
PSCAL
PSCALB
1 page  
SL1710
+j0.5
+j1
+j2
+j0.2
+j5
0 0.2 0.5
12
5
Marker
Zreal
Zimag
1 480MHz
= 75.7
= –36.4
–j0.2
–j5
START 350 MHz
–j0.5
–j2
–j1 STOP 650 MHz
Fig.4 Typical RF input impedance
APPLICATION NOTES
These application notes should be read in conjunction with
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 application detailed in Fig.3 uses a synthesised VCO.
The tuning range of the oscillator is;
Varactor line Voltage.
5 Volts
30 Volts
Oscillator Frequency
458MHz
504MHz
This configuration gives a VCO sensitivity of 1.84MHz/
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.
The VCO frequency is controlled by the SP5611
synthesiser which is programmed via an I2C bus. The RF
input to the synthesiser is from the SL1710 prescaler outputs
via RF inductors L3 and L4.
SAW RESONATOR OSCILLATOR
The application detailed in Fig. 11 shows an SL1710 with
a SAW Resonator controlled oscillator. In this instance the
frequency accuracy and stability of the oscillator are
determined by the Saw Resonator. The PCB detailed in Figs.
12 and 13 is designed to accommodate the following SAWR;
Manufacturer
MURATA
Part No
SAR479.45MB10X200
PRESCALER OUTPUTS
The VCO frequency/32 is available at the differential
prescaler outputs pins 10 and 11. This enables the on board
VCO to be synthesised via a PLL.
VCO DISABLE
The on-chip oscillator can be disabled by connecting the
VCO Disable (pin 15) to ground and enabled by connecting the
pin to VCC via a 4K7 pull up resistor.
AGC
The DC voltage measured at TP1 should be adjusted using
VR1 to read 2.5 volts with respect to VEE. this voltage equates
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 VCC -0.5 Volts minimum gain)
5
5 Page 
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SL1710.PDF ] | |
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