73K222BL
V.22, V.21, Bell 212A, 103 Single-Chip
Modem with Integrated Hybrid
DATA SHEET
A typical DAA arrangement is shown in Figure 5.This
diagram is for reference only and does not represent
a production-ready modem design.
APPLICATIONS INFORMATION
GENERAL CONSIDERATIONS
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
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.
lines are used for modem control.
(continued)
RING DETECT
+5
TX DATA
RX DATA
2 M
Ω
1 µF
RING
DETECTOR
RXA 32
1
2
3
4
5
6
7
8
GND
CLK
XTL1
XTL2
AD0
AD1
AD2
AD3
VREF 31
RESET 30
N/C 29
11.0592 MHz
8.2K
+5
ISET 28
0.1 µF
OH
27
HOOK
RELAY
RXCLK 26
RXD 25
TXD 24
0.1 µF
600
9
AD4
ADR/DATA BUS
CS
10 AD5
11 AD6
12 AD7
13 ALE
23
FUSE
CONTROL
EXCLK 22
TXCLK 21
INTERFACE
µC ALE
1
2
3
4
INT
20
µC
µC
WR
RD
14
15
16 VDD
NC 19
TXA1 18
TXA2 17
WR
RD
+5
+
10 µF
600
1:1
Ω
0.033 µF
TYP.
RJ-11
TRANSIENT
SUPPRESSOR
0.1 µF
RXCLK
TXCLK
EXCLK
CHIP SELECT
FIGURE 5: Typical 73K222BL DAA Circuit
Page: 21 of 26
© 2005, 2008 TERIDIAN Semiconductor Corporation
Rev 7.2
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
