Copyright © AUCTUS TECHNOLOGIES LTD. 200
9
. All rights are reserved.
The information contained herein is the exclusive property of AT and shall not be distributed, reproduced, or disclosed in whole or in
part without prior written permission of AT.
AT1846S
SINGLE CHIP TRANSCEIVER FOR WALKIE TALKIE Rev.0.1–Aug.2011
1. General Description
The
AT1846S
is a highly integrated single-chip
transceiver for Walkie Talkie applications. It totally
realizes the translation from RF carrier to voice in
the RX path and from voice to RF carrier in the TX
path, requiring only one micro controller.
The AT1846S has a powerful digital signal
processor, which makes it have optimum voice
quality, flexible function options, and robust
performance under varying recepti
on cond
itions.
The AT1846S can be tuned to the worldwide
frequency band for Walkie Talkie from 400MHz to
500MHz and especially from 134MHz to 174MHz
which meets the frequency band of weather
broadcast.
The transceiver uses the CMOS process with a
package size of 5X5mm. By virtue of its high
integration, it requires the least external
components and eliminates the complicated
design of sensitive RF circuits on PCB.
1.1 Features
CMOS single-chip f
ully-integrated transceiver
Fully integrated frequency synthesizer and VCO
Support worldwide frequency band
AT1846S :134MHz ~ 174MHz
200MHz~ 260MHz
400MHz ~ 520MHz
12.5KHz, 25KHz channels
Support multiple XTAL clocks
12.8/25.6Mhz
13/26Mhz
Digital auto frequency control (AFC)
Digital auto gain control (AGC)
Selectable pre/de-emphasis
Received signal strength indicator (RSSI)
VOX and SQ
Build-in CTCSS/CDCSS generator and judgment
CTCSS
with 120/180 /240 degree phase shift
23/24 bit programmable DCS code
DTMF and programmable in-band dual tone
Programmable in-band single tone transmitter
Auto RX/TX/SLEEP state switching
8 GPIOs
3-wire/4-wire/I
2
C serial control bus interface
On chip 8 dBm PA
Analog and digital volume control
Directly support 32Ω resistance loading
3.3 to 4.8 V supply voltage with Integrated LDO
5X5 mm 32 pin QFN package
1.2 Applications
Cellu
lar handsets
Family radio services
Walkie Talkies
AVDD
SDIO
AVDD
GND
PAD
SCLK
AVDD
XTAL1
XTAL2
MODE
SENB
AFOUT
NC
MIC_IN
AVDD
NC
RFIN
AVDD
NC
RFOUT
NC
NC
AVDD
PABIAS
PDN
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16
17
18
19
20
21
22
23
24
25
26272829303132
Cc
GPIO0
GPIO1
GPIO2
GPIO3
GPIO4
GPIO5
GPIO6
GPIO7
Figure 1.1 AT1846S Top View
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