Application information

STLC3055N

20/34

5.3

Application diagram

Figure 8.

Application diagram with metering pulse generation.

CS

Pulse metering shaping

capacitor

CS =

τ/(2⋅RLV)

100 nF 10% 10V

@

τ = 3.2 ms, RLV = 16.2 kΩ

CFL

Pulse metering filter capacitor

CFL = 2/(2

π⋅fttx⋅RLV)

1.5nF 10% 10 V

@fttx = 12 kHz RLV = 16.2 k

Ω

1.

In case Zs=Zl, ZA and ZB can be replaced by two resistors of same value: RA=RB=|Zs|.

2.

Defining ZTTX as the impedance of RTTX in series with CTTX, RTTX and CTTX can also be calculated from the following

formula:

ZTTX=50*(Zlttx+2Rp).

3.

In this case CTTX is just operating as a DC decoupling capacitor (fp=100 Hz).

Table 12.

External components @gain set = 1 (continued)

Name

Function

Formula

Typ. value

ZAC

RS

RRX

ZA

ZB

CCOMP

TX

ZAC1

ZAC

ZB

TX

CONTROL

INTERFACE

D0

GAIN SET

D1

D2

BGND

CVCC

CAC

CAC

IREF

RREF

GATE

VBAT

P-ch

Q1

RF1

CLK

CREV

CREV

D00TL489A

CSVR

STLC3055N

D0

D1

D2

DET

DET

ILTF

RLIM

RLIM

RTH

RTH

CSVR

RP

TIP

AGND

VPOS

VPOS

CH

RSENSE

D1

RX

RX

RS

CTTX2

RTTX

CS

CFL

RLV

RLV

TTX CLOCK

CTTX

CVCC

RSENSE

RF2

CV

VF

L

CLK

RP

RING

TIP

RING

CVPOS

RDD

RD

RD

CKTTX

CTTX1

FTTX

RTTX

SYSTEM GND

AGND

BGND

SUGGESTED GROUND LAY-OUT

VDD

CVB

CRD

PGND

PD

PD