UAA3545HLC1 NXP Semiconductors, UAA3545HLC1 Datasheet - Page 8

• Manufacturer Part Number: UAA3545HLC1
• Manufacturer: NXP Semiconductors

Specifications of UAA3545HLC1

• Operating Supply Voltage (min): 3V
• Operating Supply Voltage (max): 3.6V
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 32
• Lead Free Status / Rohs Status: Compliant

Philips Semiconductors
Receiver
The receiver is a fully integrated RF + IF strip and
demodulator for DECT. It provides all the required channel
filtering over the DECT band and generates analog RSSI
and a switched output for Philips Semiconductors
baseband chip. Very few off-chip components are required
and all of these can be placed without trimming. The chip
is designed to operate with a power supply voltage that
can fall to 3.0 V. The input is the RF antenna signal
derived from the band filter or the antenna switch. The
outputs are the RSSI voltage, representing the
instantaneous signal strength and two HIGH-level
demodulator output signals RDATAP and DATAM, the
latter being switched by SLCCTR to generate the external
slicer threshold. During the blind slot, while the PLL is
settling, an internal voltage source is activated to
precharge the external capacitor (connected to
pin DATAM) to a voltage close to the required slicer
threshold.
Operating modes
The operating modes available are:
Selection of an operating mode is achieved via the serial
interface register (see Table 3).
N
In the normal mode, the synthesizer is ON when
S_EN = HIGH and VCO_ON = HIGH, and OFF when
S_EN = LOW. When turned ON, the dividers and phase
detector are synchronized to avoid a random initial phase
error. When turned OFF, the phase detector is
synchronized with the dividers to avoid interrupting a
charge-pump pulse. This feature requires a signal to be
present for a few microseconds on the XTAL pin after
S_EN goes LOW.
The VCO is ON when the input signal VCO_ON is HIGH.
The polarity of VCO_ON is chosen for compatibility with
output S_PWR of the baseband chip. When the VCO is
turned ON, it takes 50 s (typical) to reach its steady state.
The TX preamplifier is ON when bit ‘TRX’ is programmed
to ‘0’ and VCO_ON is HIGH. When the TX preamplifier is
turned ON, it takes typically 10 s to be ready. The
receiver is turned ON when R_ON = HIGH and
VCO_ON = HIGH.
2001 Sep 06
ORMAL MODE
Normal mode (see Fig.3)
Reduced signal mode (see Fig.4)
Advanced signal mode (see Fig.5).
Fully integrated DECT transceiver
(
MODE
1)
8
R
In the reduced signal mode, the parallel control signals are
replaced by serial bus programming. To select this mode,
the bit ‘NEW’ of the internal register must be set to ‘1’ and
the bit ‘SPWR’ must be reset to ‘0’, timing is then
controlled by the S_EN signal.
After the register programming, the S_EN rising edge
programs the PLL, closes the loop, powers-on the VCO
and, if the ‘TRX’ bit = 0, turns ON the TX preamplifier.
On the falling edge of the first S_EN pulse, the loop is
opened (unless the bit ‘PLL’ is set to 1) and the receiver
switches ON if the ‘TRX’ bit = 1. A second pulse on S_EN
is required at the end of the wanted slot to power-down the
application.
The R_ON pin becomes an output in this mode, drives the
RX PIN diode and corresponds to the internal power-on
signal of the receiver.
A
In the advanced signal mode, the parallel control signals
are partly replaced by serial bus programming. To select
this mode, the bit ‘NEW’ and the bit ‘SPWR’ of the internal
register must be set to ‘1’. The S_EN signal will then
control the UAA3545 timing (except for timing of a general
power-down as this is controlled by the VCO_ON input).
The VCO_ON signal should rise at the beginning of the
previous slot. After the serial bus has been programmed,
the S_EN rising edge programs the PLL, closes the loop
and, if the ‘TRX’ bit = 0, turns ON the TX preamplifier.
On the falling edge of the first S_EN pulse, the loop is
opened (unless the ‘PLL’ bit is set to 1) and the RX section
switches ON if bit ‘TRX’ = 1. At the end of the wanted slot,
the VCO_ON goes LOW to power-down the whole IC.
In fact, the second pulse of the S_EN signal in mode 2 is
now replaced by the signal VCO_ON.
The R_ON pin becomes an output in this mode, drives the
RX PIN diode and corresponds to the internal power-on
signal of the receiver.
DVANCED SIGNAL MODE
EDUCED SIGNAL MODE
(
MODE
(
MODE
2)
3)
Product specification
UAA3545