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Электронный компонент: UAA3540

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DATA SHEET
Product specification
File under Integrated Circuits, IC17
2000 Feb 15
INTEGRATED CIRCUITS
UAA3540TS
DECT receiver
2000 Feb 15
2
Philips Semiconductors
Product specification
DECT receiver
UAA3540TS
FEATURES
Single-chip RF plus IF
Integrated channel filter
Low component count
No production trimming
High dynamic range
Low power
3.2 V operation
Built-in power-down mode.
GENERAL DESCRIPTION
The UAA3540TS is a low-power, highly integrated circuit,
for Digital Enhanced Cordless Telecommunication (DECT)
applications.
It features a fully integrated channel selection filter, an
analog Received Signal Strength Indicator (RSSI) and a
switched demodulator output to interface to Philips
Semiconductors ABC baseband chip. The circuit can be
fully powered down during the idle locked state.
QUICK REFERENCE DATA
V
CC
= 3.2 V; T
amb
= 25
C; unless otherwise specified.
ORDERING INFORMATION
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
CC
supply voltage
over T
amb
3.0
3.2
3.6
V
I
CC
supply current
-
34
45
mA
I
CC(pd)
power-down mode supply current
-
10
50
A
T
amb
ambient temperature
-
10
-
+60
C
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
UAA3540TS
SSOP20
plastic shrink small outline package; 20 leads; body width 4.4 mm
SOT266-1
2000 Feb 15
3
Philips Semiconductors
Product specification
DECT receiver
UAA3540TS
BLOCK DIAGRAM
handbook, full pagewidth
UAA3540TS
FCA040
DATA
+
DATA
-
MIXER
0
90
MIXER
LIMITER
LIMITER
D
E
M
O
D
U
L
A
T
O
R
1 k
LOA
17
18
LOB
RSET
RFA
RFB
8
6
5
15
RSSI
10
13
11
SLCCTR
Fig.1 Block diagram.
2000 Feb 15
4
Philips Semiconductors
Product specification
DECT receiver
UAA3540TS
PINNING
SYMBOL
PIN
DESCRIPTION
GND
(LO)
1
local oscillator ground
PD
2
power-down control input (logic 1
disables the chip)
V
CC(RF)
3
RF positive supply voltage
GND
(RF)
4
RF ground
RFA
5
RF balanced input A
RFB
6
RF balanced input B
GND
(IF)
7
IF ground
RSET
8
set filter (connect to external
resistor)
TEST1
9
test 1 (connect to GND)
SLCCTR
10
slicer threshold switch control input
(logic 1 closes the switch)
DATA
-
11
switched demodulator output
TEST2
12
test 2 (connect to GND)
DATA+
13
demodulator digital signal output
TEST3
14
test 3 (connect to V
CC
)
RSSI
15
received signal strength intensity
voltage output
V
CC(IF)
16
IF positive supply
LOA
17
local oscillator balanced input A
LOB
18
local oscillator balanced input B
V
CC(LO)
19
local oscillator positive supply
TEST4
20
test 4 (connect to GND)
handbook, halfpage
UAA3540TS
FCA039
1
2
3
4
5
6
7
8
9
10
GND(LO)
PD
VCC(RF)
GND(RF)
RFA
RFB
GND(IF)
RSET
TEST1
SLCCTR
TEST4
VCC(LO)
LOB
LOA
VCC(IF)
RSSI
TEST3
DATA
+
TEST2
DATA
-
20
19
18
17
16
15
14
13
12
11
Fig.2 Pin configuration.
2000 Feb 15
5
Philips Semiconductors
Product specification
DECT receiver
UAA3540TS
FUNCTIONAL DESCRIPTION
General
The UAA3540TS is a fully integrated RF plus IF strip and
demodulator for DECT applications. It provides all the
required channel filtering over the DECT band and
generates analog RSSI and a data output for the
baseband chip. Very few off-chip components are required
and should not require trimming in normal applications.
The chip is designed to operate from a power supply
voltage which can fall to 3.0 V, and features full
power-down capabilities.
The inputs are an RF antenna signal and a Local
Oscillator (LO) signal. The RF antenna signal is from a
band filter or antenna switch. The higher frequency
LO signal is from an external Voltage Controlled
Oscillator (VCO).
The outputs are an RSSI voltage, representing the
instantaneous signal strength, and DATA
-
and DATA+
which are two high-level demodulator output signals.
DATA
-
is switched by SLCCTR to generate a threshold
voltage for the internal slicer, and DATA+ is the
comparator digital output.
Filter
The integrated filter provides all the channel selectivity
required for the DECT receiver. An external resistor of
18 k
must be connected to RSET (pin 8).
Limiter and RSSI
The main purpose of the limiter circuit is to reduce the
dynamic range of the signals presented to the
demodulator; these have a dynamic range greater than
60 dB.
The limiter also provides the RSSI output voltage.
The RSSI output has very little filtering applied, and it is
assumed that external circuits will be used to provide the
time constant and peak holding required by the DECT
specification.
Demodulator
The demodulator produces an output voltage directly
proportional to the instantaneous frequency of the
received signal. The output stage of the demodulator
contains a data filter to remove high frequencies from the
signal, prior to data slicing.
The demodulator provides a continuous output timing
signal that is applied to an internal data slicer. The same
signal is also switched to generate the threshold voltage of
the slicer during the initial DECT bit sequence.
Power-down
The power-down control input (pin 2) allows the current
consumption of the chip to be reduced to a very low level
when it is connected to V
CC
. In this state, some voltages in
the chip become indeterminate requiring time for the
receiver to stabilize after power-up.