AISG Integrated Transceiver
TXIN
IDLE
START
BIT
1
1
1
1
STOP BIT
IDLE
0
0
0
0
TXOUT AND RXIN IDLE
RXOUT IDLE (LOGIC-LEVEL HIGH)
t TX
IDLE
DIR
IDLE (LOGIC-LEVEL LOW)
Figure 2. The MAX9947 on the Tower: Communication Flow is from the Tower to the Base
Table 1. Bit-Time Duration Selector
DIRMD2*
0
0
1
1
DIRMD1*
0
1
0
1
AISG DATA RATE (kbps)
9.6
38.4
115.2
Not used
UNITY BIT TIME (μs)
104.16
26.04
8.68
Not used
* DIRMD1 and DIRMD2 are internally pulled down.
+5dBm
-5dBm
-25dBm
-5dBm
-25dBm
-36dBm
fO
200kHz
400kHz
-36dBm
-67dBm
-125dBm
9kHz
1MHz
1MHz
10MHz
20MHz
30MHz
400MHz
12.75GHz
Figure 3. AISG Standard Modem Spectrum Emission Mask
Applications Information
Emission Output Profile
The AISG standard defines the maximum spectrum emis-
sion that all the OOK modulating devices must be compli-
ant with. Such a spectrum is represented in Figure 3.
The MAX9947 is compliant with the AISG standard.
An external 470pF capacitor connected between RXIN
and ground is recommended for compliance above
25MHz (see the Typical Application Circuit (Connectivity
at the Base) and Typical Application Circuit (Connectivity
at the Tower) ).
______________________________________________________________________________________
11
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