DATA SHEET
Product specification
File under Integrated Circuits, IC17
1999 Jun 04
INTEGRATED CIRCUITS
UAA2068AHL
Transmit chain and synthesizer with
integrated VCO for DECT
1999 Jun 04
2
Philips Semiconductors
Product specification
Transmit chain and synthesizer with
integrated VCO for DECT
UAA2068AHL
FEATURES
Economical integrated solution for frequency generation
in DECT cordless telephones
Integrated low phase noise 950 MHz VCO with
frequency doubler
Local Oscillator (LO) drive (
-
14 dBm) for RF mixer
circuit
Dedicated DECT PLL synthesizer
3-line serial interface bus
3 dBm output preamplifier with an integrated switch
Low current consumption from 3 V supply
Compatible with Philips Semiconductors ABC baseband
chip (PCD509x series).
APPLICATIONS
1880 to 1920 MHz DECT cordless telephones.
GENERAL DESCRIPTION
The UAA2068AHL BiCMOS device integrates a 950 MHz
VCO, a frequency doubler, main and reference dividers
and a phase comparator, to implement a phase-locked
loop for DECT channel frequencies. The 1.9 GHz signal is
buffered and switched, in TX mode, to drive the transmit
power amplifier (CGY20xx series) or, in RX mode, to be
used as an LO signal for the receiver mixer IC
(UAA3540TS).
The synthesizer's main divider is driven by the frequency
doubler output in the range from 1880 to 1920 MHz and
programmed via a 3-wire serial bus.
The reference divider ratio is fixed at 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 (phase
comparator gain) is set by an external resistor (R
SET
) at pin
R
SET
.
The VCO is powered from an internally regulated voltage
source and includes internal varicap diodes. Its tuning
range is wider than the required band to allow for
production spreads. In a Time Division Multiple Access
(TDMA) system such as DECT, the VCO and the
synthesizer are switched on one slot before the required
one to lock the VCO to the required channel frequency.
Just before the required slot, the synthesizer is switched
off, allowing open-loop modulation of the VCO during
transmission. When opening the loop, the frequency
pulling (due to switching off the synthesizer) can be
maintained within the DECT specification.
The device is designed to operate from 3 NiCd cells in
pocket phones, with low current and nominal 3.6 V
supplies. Separate power and ground pins are provided to
the different parts of the circuit. The ground leads should
be short-circuited externally to prevent large currents
flowing across the die and thus causing damage.
All supply pins (V
CC
) must also be at the same potential,
except V
CC(CP)
which can be equal to or greater than the
other supply pins (e.g. V
CC
= 3 V and V
CC(CP)
= 5 V for
wider VCO control voltage range).
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
UAA2068AHL
LQFP32
plastic low profile quad flat package; 32 leads; body 5
5
1.4 mm
SOT401-1
1999 Jun 04
3
Philips Semiconductors
Product specification
Transmit chain and synthesizer with
integrated VCO for DECT
UAA2068AHL
QUICK REFERENCE DATA
V
CC
= 3.6 V; V
CC(CP)
= 3.6 V; T
amb
= 25
C; unless otherwise specified. Characteristics for which only a typical value is
given are not tested.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
CC
supply voltage
3.0
3.6
5.2
V
V
CC(CP)
charge-pump supply voltage
V
CC(CP)
V
CC
3.0
3.6
5.2
V
I
CC(SYA)
+
I
CC(SYD)
synthesizer supply current
S_EN = 1
-
9.5
14
mA
I
CC(VCO)
+
I
CC(BUF)
VCO and buffer parts supply current
VCO_ON = 1
-
9.5
14
mA
I
CC(DBL)
doubler supply current
in RX mode
-
14.4
19
mA
in TX mode
-
10
14
mA
I
CC(AMP)
TX preamplifier supply current
in RX mode
-
0
50
A
in TX mode
-
24
32
mA
I
CC(pd)
total supply current in Power-down mode
-
5
50
A
f
o(RF)
RF output frequency
1880
-
1920
MHz
f
xtal
crystal reference input frequency
-
13.824
-
MHz
f
PC
phase comparator frequency
-
864
-
kHz
T
amb
operating ambient temperature
-
10
-
+60
C
1999 Jun 04
4
Philips Semiconductors
Product specification
Transmit chain and synthesizer with
integrated VCO for DECT
UAA2068AHL
BLOCK DIAGRAM
Fig.1 Block diagram.
handbook, full pagewidth
FCA071
RF
SWITCH
DOUBLER
3-LINE BUS
PHASE
COMPARATOR
CHARGE
PUMP
MAIN DIVIDER
REFERENCE DIVIDER
PREAMP
T_EN
LO
BUFFER
BUFFER
UAA2068AHL
VCO
CPGND
CP
VCO_ON
VCC(AMP)
VMOD
VCOA
VREG
VCGND
VCOB
VTUNE
VCOGND
VCC(CP)
RSET
RSET
VCC(DBL)
VCC(VCO)
VCC(DBL)
DBLGND
VCC(BUF)
L
L
SYDGND
XTAL
VCC(SYD)
VCC(SYA)
SYAGND
R_OFF
AMPGND
TXB
30
15
11
16
17
24
21
20
23
18
25
22
32
5
2
13
12
27
28
29
26
1
31
4
3
6
10
7
19
14
9
8
TXA
CLK
DATA
S_EN
LOA
LOB
1999 Jun 04
5
Philips Semiconductors
Product specification
Transmit chain and synthesizer with
integrated VCO for DECT
UAA2068AHL
PINNING
Notes
1. Pins 19 and 22 are internally short-circuited.
2. Use with S_PWR on ABC baseband chip.
3. Use with R_PWR on ABC baseband chip.
SYMBOL
PIN
DESCRIPTION
DATA
1
3-wire programming bus data input
V
CC(SYD)
2
synthesizer CMOS divider positive supply voltage
SYDGND
3
synthesizer CMOS divider ground
XTAL
4
reference frequency input
V
CC(SYA)
5
synthesizer prescaler positive supply voltage
SYAGND
6
synthesizer prescaler ground
CPGND
7
charge-pump ground
CP
8
charge-pump output signal
V
CC(CP)
9
charge-pump positive supply voltage
R
SET
10
charge-pump current setting input
V
CC(DBL)
11
doubler positive supply voltage
LOA
12
local oscillator output A
LOB
13
local oscillator output B
DBLGND
14
doubler ground
T_EN
15
transmit enable signal input
V
CC(BUF)
16
VCO isolation buffer positive supply voltage
V
CC(VCO)
17
VCO positive supply voltage
V
MOD
18
transmit modulation input
VCOGND
19
VCO ground; note 1
VCOA
20
VCO inductor connection A
VCOB
21
VCO inductor connection B
VCGND
22
internal varicap ground; note 1
V
TUNE
23
VCO tuning input
V
REG
24
VCO regulator output
VCO_ON
25
VCO power-on control input; note 2
R_OFF
26
power-on control for RX LO buffer/TX preamplifier; note 3
AMPGND
27
transmit amplifier ground
TXB
28
transmit amplifier output B
TXA
29
transmit amplifier output A
V
CC(AMP)
30
transmit amplifier positive supply voltage
CLK
31
3-wire programming bus clock input
S_EN
32
synthesizer enable signal input
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