MGCR01
X = Don’t Care
Description
Standby Mode
Start up Mode
ENABLE
0
0
0
STARTUP
0
1
1
MODE CDMA
X
X
X
BAND 1900
X
1
0
Conditions
All circuits powered down
except logic inputs
For high band IF
For low band IF
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
For low band IF
All circuits operational
except for IF output buffer,
CDMA input stage selected.
FM Mode
1
1
0
0
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.
Alternative FM
mode
CDMA IF AGC
only mode
1
1
1
0
0
1
1
X
FM IF AGC
1
0
0
X
Table 2 - Electrical Characteristics (Mode Control)
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.
2. 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.
3. 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.
4. 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.
3
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
