Cypress CY3274 Catatan Aplikasi - Halaman 13

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Table 5. Low Voltage PLC Board Signal Filter, Amplification, and Coupling Circuit BOM

Description

Capacitor Ceramic 10uF 35V X5R 10% 1206

Ferrite Chip 100 Ohm 4A 0805

Inductor Power Unshielded 470uH SMD

Capacitor Ceramic 0.1uF 25V X7R 0603

Capacitor Ceramic 10uF 16V X5R 1206

Capacitor Ceramic 1UF 50V Y5V 0805

Diode Ultrafast 100V 1A

Transistor NPN SOT-23

Transistor NPN 45V 3A

Transistor PNP 40V 3A

Resistor 620 OHM 1/10W 1% 0603 SMD

Resistor 4.99 1% 1/10W 0603

Resistor 10.0k 1% 1/10W 0603

Resistor 4.70K OHM 1/10W 1% 0603 SMD

Resistor 0.5 1% 1/4W 0805

Op-Amp 190MHz

Capacitor Ceramic 1500pF 10% 50V X7R 0603

Capacitor Ceramic 0.01uF 25V X7R 0603

Diode Schottky 40V 0.3A SOT-23

Inductor 1mH 10% 1007

Resistor 10.0k 1% 1/10W 0603

Resistor 2.0k 1% 1/10W 0603

3.1

Transmit Signal Path

3 . 1 . 1

T r a n s m i t Am p l i f i c a t i o n

The FSK transmit signal TX is generated on the FSK_OUT pin of the Cypress PLC device as a higher amplitude

(approximately 1.55 Vp-p), unfiltered signal. The low voltage boards do not have any transmit filtering, which reduces

the BOM cost. There is one output amplification stage, implemented using op-amp U1 and transistors Q2 and Q3, to

drive the low impedance load presented by the powerline. Resistors R3 and R4 set a gain of 1x.

When the device is not actively transmitting, it asserts the signal TX_DISABLE. This disables the external power

amplification circuitry to save power. This also makes the transmit amplification circuit have a high impedance so that

the receive signal is not attenuated.

3 . 1 . 2

L o w V o l t a g e C o u p l i n g

The transmit signal from the power amplifier is driven on to the powerlines via chip bead L2. Capacitor C6 provides

DC isolation for the transmitter on the device side. Capacitor C30 provides line frequency isolation on the line side.

With inductor L3, capacitor C30 provides a filter to remove out-of-band noise from entering the receiver.

3.2

Receive Signal Path

The receive signal is coupled from the line into the low voltage boards via the same chip bead L2, as is used by the

transmitter.

3 . 2 . 1

R e c e i ve F i l t e r

Capacitor C5 provides DC isolation. Resistor R52 provides a signal input impedance for the receiver. This, in

combination with D6, provides signal limiting to protect the receiver circuitry from the relatively high amplitude

transmitter signals, including any large signals coupled in from the line. The receive filter comprised of R52, L5, and

C4, provides some rejection of out-of-band interference such as AM broadcast signals. This interference may be

coupled from the line, and may otherwise swamp the PLC device's internal receiver circuitry. Resistors R33 and R43

set the VCC/2 bias voltage required on the receive pin of the PLC device.

www.cypress.com

Designator

Qty.

Value

Low Voltage Coupling Circuit

C30

10 µF

470 uH

Transmitter Circuit

0.1 µF

C10

10 µF

C31

1.0 µF

D2, D3

ES1B

MMBT3904

ZXT690B

ZXT790A

R3, R4

620

4.99

R13, R23, R37,

R39, R48

10.0 k

R25

4.7 k

R27, R28

0.5 1/4 W

LMH6639MF

Receiver Circuit

1500 pF

0.01 µF

BAT54S

1 mH

R33, R43

10.0 k

R52

2.0 k

Document No. 001-55427 Rev. *E

Cypress Powerline Communication Board Design Analysis

Manufacturer

MFGPN

Murata

GRM31CR6YA106KA12L

TDK

MPZ2012S101A

Pulse

P0752.474NLT

AVX

06033C104JAT2A

AVX

06033C104JAT2A

TDK

C3216X5R1C106K

Murata

GRM21BF51H105ZA12L

Diodes Inc.

ES1B

Fairchild

MMBT3904LT1

Zetex

ZXT690BKTC

Zetex

ZXT790AKTC

Rohm

MCR03EZPFX6200

Yageo

RC0603FR-074R99L

Rohm

MCR03EZPFX1002

Yageo

RC0603FR-074K7L

Susumu

RL1220S-R50-F

National

Semiconductor

LMH6639MF/NOPB

Yageo

CC0603KRX7R9BB152

AVX

06033C103JAT2A

ST Micro

BAT54SFILM

Taiyo Yuden

CB2518T102K

Rohm

MCR03EZPFX1002

Yageo

RC0603FR-072KL

Vendor

VPN

Digikey

490-5524-1-ND

Digikey

445-1567-1-ND

Digikey

553-1071-1-ND

Digikey

478-3713-1-ND

Digikey

478-3713-1-ND

Digikey

445-4052-1-ND

Digikey

490-3903-1-ND

Digikey

ES1B-FDICT-ND

Digikey

MMBT3904LT1INCT-ND

Digikey

ZXT690BKCT-ND

Digikey

ZXT790AKCT-ND

Digikey

RHM620HCT-ND

Digikey

311-4.99HRCT-ND

Digikey

RHM10.0KHCT-ND

Digikey

311-4.70KHRCT-ND

Digikey

RL12S.50FCT-ND

Digikey

LMH6639MFCT-ND

Digikey

311-1184-2-ND

Digikey

06033C103JAT2A-ND

Digikey

497-2522-1-ND

Digikey

587-2195-1-ND

Digikey

RHM10.0KHCT-ND

Digikey

311-2.00KHRCT-ND