ST75C520 查看數據表（PDF） - STMicroelectronics

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ST75C520

HIGH SPEED FAX MODEM DATA PUMP

STMicroelectronics 

ST75C520

I.7 - Power Supply

Symbol

VDD

GND

AVDD

AGNDT

AGNDR

Parameter

Digital +5V (Pin 9, 25, 41). To be connected to AVDD (see below).

Digital Ground (Pin 8, 24, 40). To be connected to AGNDT and AGNDR (see below).

Analog +5V (Pin 62). To be connected to VDD (see below).

Analog Transmit Ground (Pin 64). To be connected to GND (see below).

Analog Receive Ground (Pin 59). To be connected to GND (see below).

AGNDT and AGNDR must be connected together as close as possible to the chip.

GND and AGNDR board plans should be separated, then connected together as close as possible to the

chip, at a single point. Similarly VDD and AVDD must ne connected as close as possible to the chip, at a

single point.

II - BLOCK DIAGRAMS

II.1 - Functional Block Diagram

ST75C520

SD [0..7]

(26 to 33)

DUAL RAM

INTERFACE

15

16 14

HDLC

TX

MUX

V.17, V.29, V.27

FAX TRANSMITTER

TX

ANALOG

DPLL

HDLC

RX

V.17, V.29, V.27

FAX RECEIVER

RX

ANALOG

SINTR 38

HANDSHAKE AND

STATUS REPORT

V.24

INTERFACE

RING

DETECTOR

TONE

DETECTOR

V.21 FLAG

DETECTOR

13 12 11

10

1 TXA2

2 TXA1

60 RXA1

61 RXA2

5/45

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