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5

DS-SIG40 R1.8

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

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

VCC

Analog Interface

Protection Network

DC-Powerline

TxOn

RxOn

R23

3.3K

R11

1M

R9

1M

R10

6.8

R4

2.2

D1 BAS31

C4

0.1u

C5

2.2nF/200V

X1

32.768KHz

R3

75

C6

47p

C3

0.1

R9 6.8

C7

1n

C10

1n

C12

1n

R19

470

Q2

R15

4.3K

C8

0.1u

R18

18

C9

1n

R17

3.9K

C104

0.1u

R34

330

R7

2K

R1 10M

JP1

Host-I/F

1

2

3

4

5

6

7

8

9

10

11

12

13

14

R5

100

R14

1K

R2

330K

R12

1K

C2

12p

R13

2.2

R24

39K

C1

12p

R7

1M

R58

100K

R59

100K

C37

1u

Ceramic Filter

C32

0.1u

FSA3157

4

1

3

6

Q1

PZT2222

U1

SIG40

HDC

5

HDI

3

HDO

1

nSleep

4

INH

2

Wake

7

DTxO

18

RxN

15

InterfHop

8

VccPLL

9

nReset

6

TxOn

19

RxOn

20

GndPLL

11

OscOut

12

OscIn

13

Vcc

14

Gnd

17

RxP

16

MF0nF1

10

R8

1M

C108

470u/4V

R101

100K

R22

1M

R26

1M

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

freq.

3 db BW 20db

BW

Insertion

loss

Stop band

attenuation

In/Out

imped.

Murata

part #

Oscilent

part #

MHz

KHz

min.

KHz

max.

dB

max.

dB

min.

Ohm

*3.58

+/-40

530

6.0

25

530

SFSH3.58MCB

4.5

+/-70

750

6.0

30

1000

SFSL4.5MDB

773-0045

5.5

+/-80

750

6.0

30

600

SFSL5.5MDB

773-0055

6.0

+/-80

750

6.0

30

470

SFSL6.0MDB

773-0060

6.5

+/-80

800

6.0

30

470

SFSL6.5MDB

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.