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3.3.6
RxOn
High when the device is in receive mode.
3.3.7
Power Signals
There are two sets of power signals, Vcc, Gnd and VccPLL, GndPLL. See 3.6
C104
0.1u
VCC
R59
JP1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Host-I/F
1
2
3
4
5
6
7
8
9
10
VCC
C37
1u
VCC
C108
470u/4V
VCC
X1
C8
0.1u
C2
12p
32.768KHz
R19
C12
470
1n
C1
R18
12p
18
C32
0.1u
3.9K
VCC
R58
U1
HDO
INH
HDI
nSleep
HDC
nReset
Wake
InterfHop
VccPLL
MF0nF1
SIG40
RxOn
TxOn
DTxO
Gnd
RxP
RxN
Vcc
OscIn
OscOut
GndPLL
20
19
18
17
16
15
14
13
12
11
R7
1M
R8
1M
VCC
Ceramic Filter
GND
Out
In
Analog Interface
VCC
R22
1M
C7
1n
R34
R7
2K
330
Filter
Amp In
R5
100
R101
100K
R24
39K
75
RxOn
DCB IO
C9
R2
330K
R26
1M
1n
R17
1n
R13
2.2
R14
1K
Q2
R15
4.3K
C10
R9
1M
R9 6.8
R11
1M
2
D1 BAS31
6.8
C6
47p
R10
0.1u
R12
1K
C5
C4 2.2nF/200V
R3
0.1
3
TxOn
R23
VCC
3.3K
Q1
PZT2222
C3
1
100K 100K
VCC
5
FSA3157
4
6
Protection Network
VCC
R4
2.2
VCC
R1 10M
DC-Powerline
Figure 3.3 - Single channel line interface example
Notes: A SPST analog switch can replace FSA157.
3.3.8
Ceramic Filter Considerations
The SIG40 is designed to operate with one ceramic filter for transmission and reception. However, if
switching between two channels is desired, two ceramic filters are required. The minimum allowable
bandwidth of the ceramic filters is +/-70 kHz @ 3dB. Narrower bandwidth limits the maximal bit rate.
The SIG40 selectable frequencies are designed according to the market available ceramic filters.
Nominal 3 db BW 20db
BW
freq.
MHz
KHz
KHz
min.
max.
*3.58
+/-40 530
4.5
+/-70 750
5.5
+/-80 750
6.0
+/-80 750
6.5
+/-80 800
Insertion
loss
dB
max.
6.0
6.0
6.0
6.0
6.0
Stop band
attenuation
dB
min.
25
30
30
30
30
In/Out
imped.
Ohm
530
1000
600
470
470
Murata
part #
Oscilent
part #
SFSH3.58MCB
SFSL4.5MDB
SFSL5.5MDB
SFSL6.0MDB
SFSL6.5MDB
773-0045
773-0055
773-0060
773-0065
* The 3.58MHz frequency can be operated at 19.2Kbps only.
3.3.9
Communication performance
The maximal cable length between extreme devices depends mainly on the AC impedance of loads
connected to that line and number of nodes. The DC cable length has less effect on communication.
The SIG40 needs at least 20mVpp for proper reception. Good communication should be achieved if
the transmitted signal can be seen on an oscilloscope at the receiving side within the line noise.
@ 2007 Yamar Electronics Ltd.
5
DS-SIG40 R1.8
YAMAR [ YAMAR ELECTRONICS LTD. ]
