STLC60134S datasheet(5/22 Pages) STMICROELECTRONICS

5 / 22 page

ATU-C END: BLOCK DIAGRAM

The transformer at ATU-C side has 1:2 ratio. The

termination resistors are 12.5

Ω in case of 100Ω

lines.

The hybrid bridge resistors should be < 2.5k

Ω for

low-noise.

An HP filter must be used on the TX path to re-

duce DMT sidelobes and out of band noise influ-

ence on the receiver. On the RX path, a LP filter

must be used in order to reduce the echo signal

level and to avoid saturation of the input stage of

the receiver.

The POTS filter is used in both directions to re-

duce crosstalk between STLC60134S signals

and POTS speech and signalling.

4.7

µH

µF

100nF

ANALOG

VDD

AVDD (each pin must

have its own capacitor)

µF

100nF

µF

100nF

µF

VRAP pin

VRAN pin

µF

100nF

VREF pin

µF

100nF

AGND pin

µF

100nF

IREF pin

VCOC pin

D98TL356

100nF

Figure 3. Grounding and Decoupling Networks.

Table 3. Pin Functions (continued)

AVDD4

TX pre - drivers supply

AVDD

AVSS4

AVSS

AVSS5

AVSS

AVDD5

CT filter supply

AVDD

AVDD6

LNA supply

AVDD

AVSS6

AVSS

AVSS2

AVSS

AVDD2

DAC and support circuit

AVDD

AVDD1

XTAL oscillator supply voltage

AVDD

AVSS1

AVSS

DVSS2

DVSS

SPARES

NU3

Not used inputs

DVSS

NU2

Not used inputs

DVSS

NU1

Not used inputs

DVSS

NU0

Not used inputs

DVSS

NC0

NC1

1 LT

↔ AUT-C; NT ↔ ATU-R

STLC60134S

5/22

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