73K221AL datasheet(21/26 Pages) TDK

21 / 26 page

73K222BL

V.22, V.21, Bell 212A, Bell 103

Single-Chip Modem with Integrated Hybrid

APPLICATIONS INFORMATION

GENERAL CONSIDERATIONS

Figure 5 shows the basic circuit diagram for a

73K222BL modem integrated circuit designed to be

used in conjunction with a control processor, a

UART or RS-232 serial data interface, and a DAA

phone line interface to function as a typical

intelligent modem. The K-Series ICs interface

directly with Intel 8048 and 80C51 microprocessors

for control and status monitoring purposes.

A typical DAA arrangement is shown in Figure 5.This

diagram is for reference only and does not represent

a production-ready modem design.

In most applications the controller will monitor the

serial data for commands from the DTE and the

received data for break signals from the far end

modem. In this way, commands to the modem are

sent over the same line as the transmitted data. In

other applications the RS-232 interface handshake

lines are used for modem control.

(continued)

FIGURE 5: Typical 73K222BL DAA Circuit

RXA

VREF

RESET

N/C

ISET

RXCLK

RXD

TXCLK

EXCLK

TXD

INT

TXA1

TXA2

GND

CLK

XTL1

XTL2

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

ALE

VDD

ADR/DATA BUS

µC ALE

µC

11.0592 MHz

0.1 µF

10 µF

RXCLK

TXCLK

EXCLK

0.033 µF

TYP.

600Ω

1:1

TRANSIENT

SUPPRESSOR

FUSE

600

0.1 µF

8.2K

HOOK

RELAY

RJ-11

2 MΩ

1 µF

RING DETECT

TX DATA

RX DATA

CONTROL

INTERFACE

CHIP SELECT

µC

RING

DETECTOR

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