參數(shù)資料
型號(hào)： FX579
英文描述： Half Duplex GMSK Modem
中文描述： 半雙工GMSK調(diào)制解調(diào)器
文件頁(yè)數(shù)： 6/23頁(yè)
文件大?。?/td> 582K
代理商： FX579
Half Duplex GMSK Modem
FX579
1996 Consumer Microcircuits Limited
6
D/579/4
1.4
External Components
External Components
Component
R1
R2
X1
C1
C2
Value
1M
Note 1
Note 3
100nF
100nF
Tolerance
±10%
± 5%
Component
C3
C4
C5
C6
C7
Value
Note 2
Note 2
Note 3
Note 3
Note 1
Tolerance
±20%
±20%
±20%
±20%
±5%
Notes:
1.
The RC network formed by R2 and C7 is required between the TXOP pin and the input to the modulator. This network, which can
form part of any dc level shifting and gain adjustment circuitry, forms an important part of the transmit signal filtering. The ground
connection to the capacitor C7, should be positioned to give maximum attenuation of high frequency noise into the modulator.
The component values should be chosen so that the product of the resistance (Ohms) and the capacitance (Farads) is:
BT of 0.3 = 0.34/bit rate (bits/sec)
BT of 0.5 = 0.21/bit rate (bits/sec)
with suitable values for common bit rates being:
R2
4000 bits/sec
BT = 0.3
180.0k
4800 bits/sec
BT = 0.5
91.0k
8000 bits/sec
BT = 0.3
91.0k
9600 bits/sec
BT = 0.5
47.0k
19 200 bits/sec
BT = 0.5
91.0k
32 000 bits/sec
BT = 0.3
47.0k
32 000 bits/sec
BT = 0.5
47.0k
38 400 bits/sec
BT = 0.3
47.0k
38 400 bits/sec
BT = 0.5
47.0k
C7
470pF
470pF
470pF
470pF
120pF
220pF
150pF
180pF
120pF
Note that in all cases the value of R2 should not be less than 47.0k
and that the calculated value of C7 includes calculated
parasitic capacitances.
C3 and C4 should both be 15.0nF for a data rate of 8kbits/sec, and inversely proportional to the data rate for other data rates, e.g.
30.0nF at 4kbits/sec, 3.0nF at 40kbits/sec.
The FX579 can operate correctly with Xtal/Clock frequencies between 1.0MHz and 6.5MHz (V
DD
= 5V) and up to 5.0MHz
(V
DD
= 3V). The value chosen for C5 and C6 should be suitable for the applied V
DD
and the frequency of X1 and include stray
capacitance. As a guide:
At 5 Volts, C5 = C6 = 33.0pF at 1.0MHz falling to 18pF at 6.5MHz
At 3 Volts, C5 = C6 = 33.0pF at 1.0MHz falling to 18pF at 5MHz
The equivalent series resistance of X1 should be less than 2.0k
at 1MHz falling to 150
at the maximum frequency. Stray
capacitance on the Xtal/Clock circuit pins must be minimised.
2.
3.
Figure 2 Recommended External Components (SOIC Package)
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