uaa3535hl NXP Semiconductors, uaa3535hl Datasheet - Page 7

• Manufacturer Part Number: uaa3535hl
• Description: Low Power Gsm/dcs/pcs Multi-band Transceiver
• Manufacturer: NXP Semiconductors

Philips Semiconductors
IF
The IF synthesizer is only necessary in transmit mode.
The TX IF VCO and synthesizer section can be
powered-up with the control bit TXIFON; see Table 2.
If TXIFON is not used, the IF VCO and synthesizer section
will be enabled with the signal TXON.
Table 2 IF synthesizer and VCO power control
LNA
When the receiver is on, it is possible to switch-off the low
noise amplifier separately. Separate control of the low
noise amplifier is accomplished by the control bit LNA; see
Table 3.
Table 3 LNA power control
B
The receiver includes two RF front-end and RF LO
sections; one for GSM where the RF LO is divided-by-2
and fed to the 925 to 960 MHz front-end, and the other
one for DCS and/or PCS where the RF LO is not divided
and fed to the 1805 to 1990 MHz front-end. The selection
of these 2 modes is accomplished by the control bit BND;
see Table 4.
Table 4 Band selection control
2000 Feb 17
AND SELECTION CONTROL
Low power GSM/DCS/PCS multi-band transceiver
SYNTHESIZER AND
POWER CONTROL
BIT TXIFON
BIT BND
BIT LNA
0
1
0
1
0
1
VCO
CONTROL
GSM
DCS and/or PCS
IF SYNTHESIZER AND
BAND MODE
VCO MODE
LNA MODE
off
on
off
on
7
S
The receiver includes an image rejection front-end which
allows the use of a RF LO 100 kHz below the RF input
frequency (infradyne) or 100 kHz above the RF input
frequency (supradyne). Between these two states the
proper image should be selected for rejection.
The selection of these 2 modes is accomplished by the
control bit SBD; see Table 5.
Table 5 Sideband selection control
TX
The transmit modulation loop includes a transmit charge
pump where sink and source currents are determined by
an external resistor. When determined, this nominal
current can be divided-by-1 or 2 to cope with different
transmit VCO gains. The selection of these 2 modes is
accomplished by the control bit TXI; see Table 6.
Table 6 TX charge pump current control
R
The reference divider can be programmed to divide the
external reference frequency by 65 or 130. The selection
of these 2 modes is accomplished by the control bit
REFDIV; see Table 7.
Table 7 Reference divider control
BIT REFDIV
IDEBAND SELECTION CONTROL
EFERENCE DIVIDER CONTROL
BIT SBD
CHARGE PUMP CURRENT CONTROL
BIT TXI
0
1
0
1
0
1
supradyne
infradyne
nominal current
nominal current divided-by-2
divide-by-65
divide-by-130
TX CHARGE PUMP CURRENT MODE
REFERENCE DIVIDER MODE
SIDEBAND MODE
Objective specification
UAA3535HL