PBL38772/1 データシートの表示（PDF） - Ericsson

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PBL38772/1

Subscriber Line Interface Circuit (SLIC)

Ericsson  

PBL 387 72

Power-up Sequence

No special power-up sequence is necessary except that

ground has to be present before all other power supply

voltages. The digital inputs C1, C2 and C3 are internal pull-up

terminals.

Printed Circuit Board Layout

Care in Printed Circuit Board (PCB) layout is essential for

proper function. The components connection RSN input

should be placed in close proximity to that pin, such that no

interference is injected into the receive summing node (RSN).

Ground plane surrounding the RSN pin is advisable. Analog

Ground (AGND should be connected to Battery Ground

(BGND near the SLIC package. RLC and RREF should be

connected to AGND with short leads. Pin LP and HP are

sensitive to leakage currents. The CLP connection between

pins LP and VTBAT should be as short as possible. CB and

CTB must be connected near the pins VBAT and VTBAT

with short vias to ground. The batwing pins are internally

connected to VBAT and used for transferring the heat from

the chip to the printed circuit board. It is therefore advisable

to implement a PCB layout that facilitates heat conduction

away from the batwing pins.

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EN/LZT 146 136 R1A © Ericsson Microelectronics, December 2001

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