Philips Semiconductors
Product specification
Fully integrated DECT transceiver
FEATURES
•
Economical solution for a radio in DECT cordless
telephones
•
Integrated low phase noise VCO with no production
tuning required
•
Fully integrated receiver with high sensitivity
•
Dedicated DECT PLL synthesizer
•
3 dBm output preamplifier with an integrated switch
•
3-line serial interface bus
•
Low current consumption from a 3.2 V supply
•
Compatible with Philips Semiconductors baseband
chips (PCD509xx and PCD80xxx)
•
Reduced number of control signals.
APPLICATIONS
•
DECT cordless telephones: 1880 to 1930 MHz.
GENERAL DESCRIPTION
The UAA3545 BiCMOS device is a low power, highly
integrated circuit, for Digital Enhanced Cordless
Telecommunication (DECT) applications.
It features a fully integrated receiver, from antenna filter
output to the demodulated data output, a fully integrated
VCO, a synthesizer to implement a phase-locked loop for
DECT channel frequencies and a TX preamplifier to drive
the external transmit power amplifier (CGY20xx series or
UAA359x series of Philips integrated circuits).
ORDERING INFORMATION
TYPE
NUMBER
UAA3545HL
PACKAGE
NAME
LQFP32
DESCRIPTION
plastic low profile quad flat package; 32 leads; body 5
×
5
×
1.4 mm
UAA3545
The synthesizer’s main divider is driven by the prescaler
output in the range of 1880 to 1930 MHz and is
programmed via a 3-wire serial bus. The reference divider
ratio is programmable to 4, 8, 12 or 16. Outputs of the
main and reference dividers drive a phase comparator
where a charge pump produces phase error current pulses
for integration in an external loop filter (only a passive loop
filter is necessary). The charge-pump current is set to
4 mA for fast switching.
The VCO is powered from an internally regulated voltage
source and includes integrated variable capacitance
diodes and integrated coils. Its tuning range is guaranteed.
The VCO and the synthesizer are switched-on one slot
before the active slot to lock the VCO to the required
channel frequency. Immediately before the active slot, the
synthesizer is switched-off to allow open loop modulation
of the VCO during transmission. When opening the loop,
frequency pulling (due to switching-off the synthesizer)
can be maintained within the DECT specification.
The device is designed to operate from a 3.2 V nominal
supply. Separate power and ground pins are provided for
the different sections of the circuit. Ground leads should be
short-circuited externally to prevent large currents flowing
across the die and causing damage. All V
CC
supplies
(V
CC(REG)
, V
CC(SYN)
, V
CC(RX)
and V
CC(TX)
) must be at the
same potential (V
CC
).
VERSION
SOT401-1
2001 Sep 06
2
Philips Semiconductors
Product specification
Fully integrated DECT transceiver
PINNING
SYMBOL
VCO_ON
V
CC(REG)
V
CC(SYN)
S_DATA
XTAL
S_EN
RDATAP
S_CLK
DATAM
SYNGND
SLCCTR
RSSI
RXGND
RFB
RFA
V
CC(RX)
R_ON
TEST3
TXGND
TXA
TXB
V
CC(TX)
DIVGND
VREGDIV
V
MOD
VREGI
VCOGND
TEST1
TEST2
REGGND
VREGO
CP/VCO
tune
Notes
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
VCO section power-on control; note 1
regulator positive supply voltage
synthesizer positive supply voltage
3-wire bus data signal input
reference frequency input; note 2
3-wire bus enable signal input
demodulator output voltage
3-wire bus clock signal input
switched demodulator output voltage
synthesizer ground
DATAM switch control signal (see Fig.1)
received signal strength intensity voltage output
receiver ground
received signal input B
received signal input A
receiver positive supply voltage
receiver power-on control; note 3
TEST input 3 (must be connected to GND)
transmitter ground
transmit amplifier output A
transmit amplifier output B
transmitter positive supply voltage
divider ground
divider regulated supply voltage
VCO analog modulation voltage input
VCO regulated voltage input
VCO ground
TEST input 1 (must not be connected)
TEST input 2 (must not be connected)
regulator ground
VCO section regulated voltage output
charge-pump output/VCO tuning input
DESCRIPTION
UAA3545
1. Corresponds to the S_PWR of the baseband chip (see Section “Operating modes” for more details).
2. Corresponds to the REF_CLK of the baseband chip.
3. See Section “Operating modes” for more details.
2001 Sep 06
5
Analogue and Mixed Signal
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