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73K221AL Datasheet(PDF) 13 Page - TDK Electronics

Part # 73K221AL
Description  V.22, V.21, Bell 212A, Bell 103 Single-Chip Modem with Integrated Hybrid
PDF  26 Pages
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Manufacturer  TDK [TDK Electronics]
Direct Link  http://www.tdk.com
Logo TDK - TDK Electronics

73K221AL Datasheet(HTML) 13 Page - TDK Electronics

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73K222BL
V.22, V.21, Bell 212A, Bell 103
Single-Chip Modem with Integrated Hybrid
13
TONE REGISTER (continued)
D7
D6
D5
D4
D3
D2
D1
D0
TR
011
RXD
OUTPUT
CONTR.
TRANSMIT
GUARD
TONE
TRANSMIT
ANSWER
TONE
TRANSMIT
DTMF
DTMF 3
DTMF 2
DTMF 1/
OVER-
SPEED
DTMF 0/
ANSWER/
GUARD
BIT NO.
NAME
CONDITION
DESCRIPTION
Programs 1 of 16 DTMF tone pairs that will be
transmitted when TX DTMF (TONE, Bit D4) and TX
ENABLE bit (CR0, Bit D1) are set. Tone encoding is
shown below:
DTMF CODE
D3 D2 D1 D0
KEYBOARD
EQUIVALENT
TONES
LOW
HIGH
1
697
1209
2
697
1336
3
697
1477
4
770
1209
5
770
1336
6
770
1477
7
852
1209
8
852
1336
9
852
1477
0
941
1336
*
941
1209
#
941
1477
A
697
1633
B
770
1633
C
852
1633
D3, D2,
D1, D0
DTMF 3, 2, 1, 0
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
D
941
1633
D4
Transmit DTMF
0
Disable DTMF.
1
Activates DTMF. The selected DTMF tones are
transmitted continuously when this bit is high and TX
ENABLE (CR0, Bit 1) is set to one. TX DTMF
overrides all other transmit functions.
D5
D4
D0
D5 interacts with bits D4 and D0 as shown.
0
0
X
Disables answer tone generator.
D5
Transmit
Answer Tone
1
0
0
Enables answer tone generator. A 2225 Hz answer
tone will be transmitted continuously when the
TRANSMIT ENABLE bit is set in CR0. The device
must be in answer mode.
1
0
1
Likewise a 2100 Hz answer tone will be transmitted.



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