Philips UAA2068AHL Datasheet

INTEGRATED CIRCUITS
DATA SH EET
UAA2068AHL
Transmit chain and synthesizer with integrated VCO for DECT
Product specification File under Integrated Circuits, IC17
1999 Jun 04
Philips Semiconductors Product specification
Transmit chain and synthesizer with integrated VCO for DECT
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).
UAA2068AHL
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 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 (VCC) must also be at the same potential, except V other supply pins (e.g. VCC= 3 V and V wider VCO control voltage range).
which can be equal to or greater than the
CC(CP)
CC(CP)
) at pin
SET
= 5 V for
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.
ORDERING INFORMATION
TYPE NUMBER
NAME DESCRIPTION VERSION
UAA2068AHL LQFP32 plastic low profile quad flat package; 32 leads; body 5 × 5 × 1.4 mm SOT401-1
PACKAGE
Philips Semiconductors Product specification
Transmit chain and synthesizer with
UAA2068AHL
integrated VCO for DECT
QUICK REFERENCE DATA
= 3.6 V; V
V
CC
given are not tested.
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
CC
V
CC(CP)
I
CC(SYA)
I
CC(SYD)
I
CC(VCO)
I
CC(BUF)
I
CC(DBL)
I
CC(AMP)
I
CC(pd)
f
o(RF)
f
xtal
f
PC
T
+
+
amb
CC(CP)
= 3.6 V; T
=25°C; unless otherwise specified. Characteristics for which only a typical value is
amb
supply voltage 3.0 3.6 5.2 V charge-pump supply voltage V
CC(CP)
V
CC
3.0 3.6 5.2 V
synthesizer supply current S_EN = 1 9.5 14 mA
VCO and buffer parts supply current VCO_ON = 1 9.5 14 mA
doubler supply current in RX mode 14.4 19 mA
in TX mode 10 14 mA
TX preamplifier supply current in RX mode 050µA
in TX mode 24 32 mA total supply current in Power-down mode 550µA RF output frequency 1880 1920 MHz crystal reference input frequency 13.824 MHz phase comparator frequency 864 kHz operating ambient temperature 10 +60 °C
Philips Semiconductors Product specification
Transmit chain and synthesizer with integrated VCO for DECT
BLOCK DIAGRAM
handbook, full pagewidth
V
R_OFF
AMPGND
V
CC(SYD)
V
CC(SYA)
TXA TXB
LOA LOB
26 29 28
27
12 13
2 5
CC(AMP)
30 15 11 16 17 24 21 20
PREAMP
V
CC(DBL)
BUFFER
3-LINE BUS
32
1 31 4 3 6 10 7
T_EN
RF
SWITCH
LO
MAIN DIVIDER
REFERENCE DIVIDER
V
CC(DBL)
DOUBLER
V
CC(BUF)
BUFFER
V
UAA2068AHL
PHASE
COMPARATOR
CC(VCO)
V
REG
VCO
UAA2068AHL
LL
VCOB
VCOA
23 18
25 22 19 14
9
CHARGE
PUMP
8
V
TUNE
V
MOD
VCO_ON VCGND VCOGND DBLGND
V
CC(CP)
CP
S_EN
DATA
CLK
XTAL
SYDGND
SYAGND
Fig.1 Block diagram.
R
SET
CPGND
R
SET
FCA071
Philips Semiconductors Product specification
Transmit chain and synthesizer with integrated VCO for DECT
PINNING
SYMBOL PIN DESCRIPTION
DATA 1 3-wire programming bus data input V
CC(SYD)
SYDGND 3 synthesizer CMOS divider ground XTAL 4 reference frequency input V
CC(SYA)
SYAGND 6 synthesizer prescaler ground CPGND 7 charge-pump ground CP 8 charge-pump output signal V
CC(CP)
R
SET
V
CC(DBL)
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)
V
CC(VCO)
V
MOD
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
V
REG
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)
CLK 31 3-wire programming bus clock input S_EN 32 synthesizer enable signal input
2 synthesizer CMOS divider positive supply voltage
5 synthesizer prescaler positive supply voltage
9 charge-pump positive supply voltage 10 charge-pump current setting input 11 doubler positive supply voltage
16 VCO isolation buffer positive supply voltage 17 VCO positive supply voltage 18 transmit modulation input
23 VCO tuning input 24 VCO regulator output
30 transmit amplifier positive supply voltage
UAA2068AHL
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.
Philips Semiconductors Product specification
Transmit chain and synthesizer with integrated VCO for DECT
handbook, full pagewidth
CLK
S_EN
31
32
1
DATA
XTAL
CP
2 3 4 5 6 7 8
9
10
SET
R
CC(CP)
V
V
CC(SYD)
SYDGND
V
CC(SYA)
SYAGND
CPGND
CC(AMP)
V 30
TXA 29
TXB 28
UAA2068AHL
11
12
13
LOB
LOA
CC(DBL)
V
R_OFF
AMPGND 27
26
14
15
T_EN
DBLGND
VCO_ON
25
16
CC(BUF)
V
24 23 22 21 20 19 18 17
FCA070
V
REG
V
TUNE
VCGND VCOB VCOA VCOGND V
MOD
V
CC(VCO)
UAA2068AHL
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION Transmit chain
BUFFER AND FREQUENCY DOUBLER
VCO, The VCO operates at a nominal centre frequency of
950 MHz. The VCO is fully integrated apart from two inductors which complete the resonator network. The VCO operates from an on-chip regulated power supply (V
REG
which minimizes frequency disturbances due to variations in supply voltage. The buffered VCO signal is fed into a frequency doubler. The large difference between the transmitted and VCO frequencies reduces transmitter oscillator coupling problems.
The output of the doubler is used to drive the synthesizer main divider and can also be switched to either the TX preamplifier or the RX LO output buffer. The high isolation obtained from the VCO buffer and the frequency doubler ensures that very small frequency changes occur when turning on the TX preamplifier or the RX LO output buffer. In TX mode, the oscillator can be directly modulated with GMSK filtered data at pin V
MOD
.
RF SWITCH The RF switch passes the doubled VCO signal to either
the TX preamplifier (when T_EN is HIGH) or to the RX LO buffer (when T_EN is LOW). In TX mode, the difference in the RF power levels, observed at the TX output when T_EN is switched from LOW-to-HIGH, is typically 40 dB.
TX
),
PREAMPLIFIER
The TX preamplifier amplifies the RF signal up to a level of 3 dBm which is suitable for use with Philips Semiconductors DECT power amplifiers such as the CGY20xx series. It is powered-up when both R_OFF and VCO_ON are HIGH.
RX LO
BUFFER
The RX LO buffer outputs the frequency doubled VCO signal at a level of 14 dBm. This signal can then be used as the local oscillator drive for the receive mixers of devices such as the UAA3540TS. The buffer is powered-up when R_OFF is LOW and VCO_ON is HIGH.
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