ATMEL AT48810-RB, AT48810-LH, AT48810-LB, AT48810-CH, AT48810-CB Datasheet
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900 MHz
SpreadSpectrum RF
Module
Preliminary
Features
0625A
Designed for use with Atmel ’s AT 48 80 2 Spre ad -Spectrum Signal Processo r
•
FCC Part 15, Unlicensed Operati on
•
RF Despreading and Narro wba nd IF for Hig he st Ja mming Margin
•
1 mW Narrowband Operation, or 1 and 50 mW Spread-Spectru m Operation
•
Description
The AT48810 RF module is intended for time domain duplex spread-spectrum communications under FCC Part 15, 902-928 MHz unlicensed operations. This module
features RF despreading and narrowband IF for powerful interference rejection.
Spreading is via direct sequence. The unit can also be operated in a narrow-band
configuration (FCC limits power to 1 mW in narrow band) by restricting the DC voltage
to the power amplifier so that the transmit power is less than 0 dBm per FCC regulations. The unit can also be run in slow half duplex or simplex mode.
AT48810
Pin Diagram
15.36 MHz Clock Out
Ground
V
Synthesizer Data Clock Input
Synthesizer Data Input
Synthesizer Data Latch Input
Modulation Input
No Connection
PN Spreading Enable Input
PN Input
Note: 1. Connector on modu le is Dup on t/ Berg part number 87814-610.
Mating connector is 87409-110.
1
2
Audio Out
3
4
Ground
5
6
CC
7
9
11
13
15
17
19
RSSI Out
8
T/R Switch
10
LNA Gain Hi/Low
12
V
CC
14
No Connection
16
Transmit PowerOn/Off Input
18
PowerAmp V Input
20
PowerAmp V Input
CC
CC
3-1
Block Diagram
GAIN
PA V
ON/OFF
AMP
ON/OFF
CC
f = 83.16 MHz
C
Bw = 30 kHz
DOWN
CONVERTER
XTAL OSC
83.16 ± 1.23 MHz
HANDSET OR BASE
UPCONVERTER SPREAD
f = 915 MHz
C
OTHER CIRCUITS
V
CC
ON/OFF
f = 1.23 MHz
C
PN ENABLEPN
RSSI
SYNTHESIZER
TX PWR
LNA IF AMP
ANTENNA
PORT
T/R
SWITCH
902-
928 MHz
TR SW
TX PWR
Note: 1. Th e modu le canno t le gall y be cert if ied wit ho ut an ante nna; thi s is an FCC requi remen t.
DISCRIMINATOR
3
TCXO
15.36 MHz
AUDIO
DATA
CLOCK
TDD Rate
7.5 kHz max
Operating Frequenc ies
Table 1. Version “B”
Channel N
1 1334 825.7536 910.1424 908.9136
2 1350 829.4400 913.8288 912.6000
3 1356 833.1264 917.5152 916.2864
4 1363 837.4272 921.8160 920.5872
Note: 1. Second LO = 84.3888 MHz
2. Reference Divider = 25
3. Phase Detector = 614.4 kHz
4. First IF = 83.160 MHz
5. Second IF = 1. 229 MHz
3-2 AT48810
(1, 2, 3, 4, 5, 6, 7, 8)
End B
First LO, MHz TX, MHz RX, MHz
6. Synthesizer PLL Bandwidth = 80 kHz nominal
7. Frequency Accuracy = ± 3.5 ppm
(including temperature 0° to 50°C)
8. Switching Time = 2.2 ms nominal, Ch 1 to Ch 4
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