ACE9020
Receiver and Transmitter Interface
Supersedes February 1997 edition, DS4287 - 4.1
DS4287 - 5.0 December 1997
ACE9020isaVHFoscillator, up-converterandprescaler.
It is used in an offset modulated transmit architecture where a
UHF synthesiser makes the channel selection and a second
synthesiser generates a fixed transmit offset.
PD1
PD2
1
28
VCC
n.c.
GND
n.c.
A VCO signal drives a buffer in ACE9020 to feed an on-
chip prescaler and transmit up-converter. The prescaler is a
dual two-modulus divider and drives the main synthesiser
input of the ACE9030. The SSB up-converter suppresses the
unwanted transmit sideband.
The VHF oscillator is buffered to drive the auxiliary
synthesiser input of the ACE9030 and is locked to the offset
frequency. This frequency is modulated by varying the
resonant frequency of the external tank circuit. Both this
oscillator and the UHF VCO drive the up-converting mixer to
generate the transmit signal.
Various power saving modes for battery economy are
included. These allow the transmit sections to be shut down
during stand-by and the whole chip can be shut down during
sleep mode. The circuit techniques used have been chosen to
minimise external components and at the same time give very
high performance.
BIAS_REF
VCC_TX
TXPA+
VCC_RX
n.c.
RXVCOIN
GND_RX
VCC_TXOSC
TXOSC-
TXOSC+
GND_DIV
RATIO_SEL
DIV_OUT-
DIV_OUT+
TXPA-
RSET_TXPA
GND_TXOSC
TANK+
TANK-
VCC_DIV
GND_OSC
MOD_CNTRL
15
14
Note: Pin 1 is identified by moulded spot
and by coding orientation.
NP28
Fig.1 Pin connections - top view
ORDERING INFORMATION
SSOP 28 lead package, code NP28
ACE9020B/KG/NP1S - anti-static sticks
ACE9020B/KG/NP1T - tape mounted
FEATURES
■ Low Power Low Voltage (3.6 to 5.0 V) Operation
■ Power Down Modes
■ Differential Signals to Minimise Cross-talk
■ Auxiliary Oscillator with Transmit Up-converter
■ Prescaler for Main Synthesiser
■ Part of the ACE Integrated Cellular Phone Chipset
■ Small Outline 28 pin Package
TXOSC+
TXOSC-
RSET_TXPA
TANK+
VHF
TXPA+
TXPA-
OSC
APPLICATIONS
TANK-
■ AMPS and TACS Cellular Telephone
■ Two-Way Radio Systems
BIAS_REF
PD1
BIAS &
POWER
DOWN
CONTROL
PD2
RELATED PRODUCTS
ACE9020 is part of the following chipset:
■ ACE9030 Radio Interface and Twin Synthesiser
■ ACE9040 Audio Processor
RXVCOIN
■ ACE9050 System Controller and Data Modem
RATIO_SEL
DIV_OUT+
DIV_OUT-
DIVIDE BY
64/65 OR 128/129
MOD_CNTRL
ABSOLUTE MAXIMUM RATINGS
Supply voltage
6V
- 65°C to + 150°C
- 30°C to + 85°C
-0.3V to VCC +0.3V
500V
Storage temperature
Operating temperature
Voltage at any pin
Fig. 2 ACE9020 simplified block digram
Static Sensitivity (HBM) min