ACE9020
Receiver and Transmitter Interface
DS4287
ISSUE 5.0
December 1997
ACE9020 is a VHF oscillator, up-converter and prescaler.
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.
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.
Ordering Information
SSOP 28 lead package, code NP28
ACE9020B/KG/NP1S
- anti-static sticks
ACE9020B/KG/NP1T
- tape mounted
PD1
PD2
GND
BIAS_REF
VCC_TX
TXPA+
TXPA-
RSET_TXPA
GND_TXOSC
TANK+
TANK-
VCC_DIV
GND_OSC
MOD_CNTRL
1
28
VCC
n.c.
n.c.
VCC_RX
n.c.
RXVCOIN
GND_RX
VCC_TXOSC
TXOSC-
TXOSC+
GND_DIV
RATIO_SEL
DIV_OUT-
DIV_OUT+
ACE9020
14
15
Features
鈥?Low Power Low Voltage (3.6 to 5.0 V) Operation
鈥?Power Down Modes
鈥?Differential Signals to Minimise Cross-talk
鈥?Auxiliary Oscillator with Transmit Up-converter
鈥?Prescaler for Main Synthesiser
鈥?Part of the ACE Integrated Cellular Phone Chipset
鈥?Small Outline 28 pin Package
Applications
鈥?AMPS and TACS Cellular Telephone
鈥?Two-Way Radio Systems
Related Products
ACE9020 is part of the following chipset:
鈥?ACE9030 Radio Interface and Twin Synthesiser
鈥?ACE9040 Audio Processor
鈥?ACE9050 System Controller and Data Modem
ABSOLUTE MAXIMUM RATINGS
Supply voltage
Storage temperature
Operating temperature
Voltage at any pin
Static Sensitivity (HBM) min
6V
- 65擄C to + 150擄C
- 30擄C to + 85擄C
-0.3V to V
CC
+0.3V
500V
Note: Pin 1 is identified by moulded spot
and by coding orientation.
NP28
Figure 1 - Pin connections - top view
TXOSC+
TXOSC-
RSET_TXPA
TANK+
TANK-
VHF
OSC
TXPA+
TXPA-
BIAS_REF
PD1
PD2
BIAS &
POWER
DOWN
CONTROL
RXVCOIN
RATIO_SEL
DIV_OUT+
DIV_OUT-
MOD_CNTRL
DIVIDE BY
64/65 OR 128/129
Figure 2 - ACE9020 simplified block digram
1
2
3
4
5
6
