Preliminary Information
Electrical Characteristics
(Mode Control)
Description
Standby Mode
Start up Mode
SATURN
ENAVLE STARTUP MODE CDMA BAND 1900
0
0
0
0
1
1
X
X
X
X
1
0
Conditions
All circuits powered down
except logic inputs
For high band IF
(210.38MHz)
For low band IF (85.38MHz)
Turns on VCO circuits, DLL
quadrature generation,
prescaler and IQ
demodulator. All other
circuits remain powered
down
CDMA mode
1
1
1
1
1
1
1
0
For high band IF
(210.38MHz)
For low band IF (85.38MHz)
All circuits operational
except for IF output buffer,
CDMA input stage selected.
All circuits operational
except for IF output buffer,
FM input stage selected.
Note 4
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled
Demodulator and LO
generation circuitry powered
down. IF output buffer
enabled.
FM Mode
1
1
0
0
Alternative FM mode
CDMA IF AGC
only mode
1
1
1
0
0
1
1
X
FM IF AGC
1
0
0
X
X = Don’t Care
Notes
1.
STARTUP mode is provided to allow VCO/DLL/prescalers to stabilise before signal path is activated. This is a power-saving
feature since the signal path is redundant during this period. If this feature is not required, the ENABLE and STARTUP
control pins can be shorted together so that all circuitry is activated at the same time.
In high band mode (Band 1900 = 1) the VCO operates at twice the IF frequency. For example if IF = 210.38MHz then the
oscillator operates at 420.76MHz. A delay locked loop (DLL) circuit then generates the quadrature LO signals. The prescaler
output, VHFBUF, is VCO frequency divided by 8 (52.494MHz).
In low band mode (Band 1900 = 0) the VCO operates at 4 times the IF frequency. for example if IF = 85.38MHz the oscillator
operates at 341.52MHz. This is then divided and uses DLL circuit to provide the quadrature LO signals. The prescaler output,
VHFBUF, is VCO frequency divided by 8 (42.69MHz).
This mode can be used for FM. The VCO operates at twice the LO frequency. This mode is not normally used as a large
tuning range is required on the VCO. Prescaler output is LO frequency divided by four.
2.
3.
4
3
MITEL [ MITEL NETWORKS CORPORATION ]
