![](http://datasheet.mmic.net.cn/300000/KS16114_datasheet_16200449/KS16114_67.png)
KS16112/4
9600/14400 bps FAX MODEM
-
67
-
MODEM CIRCUIT INTERFACE
The modem is packaged in a 68 - pin PLCC to be designed into OEM circuit boards. An example of a hard-
ware realization is shown in Figure 11. This figure also includes the circuitry needed to display the eye
pattern.
PR
74LS74
CLK CL O
13
VDD
+ 5VD
86.6K 1%
1000
P
F 5%
0.33
RXA
1%
-
+
1458
+ 12V
0.110K 1%
3.0K
POR
0.1
36.5K
1%
86.6K 1%
1000
P
F 5%
TXA
1458
-
+
34.8K 1% 0.1
0.1
- 12V
AUXIN
1K
1K
+ 5V
10K
- 12V
1.0
255 1/4W
0.1
1N4625D
+ 5V
3.0
+ 5VA
2.7M
0.1
0.33
10
25V
High Freq.
Alum. Elect.
Note :
1. All Resistors
±
5%,
1/8W unless noted
2. All capacitors
μ F
,
±
20%, 50V unless noted
15
V
DD
GNND2
54
68
10
51
45
44
53
30
35
36
52
34
25
48
47
24
32
17
9
13
14
31
33
43
29
42
40
41
39
50
GNND1
PORI
PORO
RXAI
AOUT
AGCIN
GNDA2
AES
AEE
GNDA1
TXAO
DAOUT
DAIN
ADOUT
ADIN
AUXAI
SYNCIN2
EN85
XCLKO
YCLKO
V
BB
FOUT
FIN
RCVO
RCVI
CABL1
CABL2
V
CC
RCI
22
38
SEPCLK
ECLKIN
SEPWCLK
SYNCIN1
SEPXO
SEPYO
RS4
RS3
RS2
RS1
RS0
D7
D6
D5
D4
D3
D2
D1
D0
IRQ
WRITE( R/W )
CS
READ-
2
RTS
CTS
TXDI
DCLK
RXDO
RLSD
XTALI
XTALO
KS16112/4
21
49
23
26
67
1
2
3
4
55
56
57
58
59
60
61
62
63
64
65
66
7
18
19
20
27
28
V . 24 SERIAL
INTERFACE
74LS164
CLK
3 4 5 6 10111213
A
B
VDD
CLR
GND
LE
ADJ
REF IN
REF OUT
17
0.01
VOUT
SUM
ACOUP
1
22
OFFSET
NE5018
LE
ADJ.
REF IN
RET OUT
VOUT
SUM
OFFSET
ACOMP
NE5018
12
11
1
2
8
2 3 4 5 6 7 8 9
LSB
MSB
10
12
13
14
A
B
CLK
VDD
CLR
GND
74LS164
3
4
5
6 10 11 12 13
9
7 8
6
5
4
3
2
1
2
8
10
12
13
14
8
0.1
14
9
7
4.7K
0.1
16
MICRO-
PROCESSOR
INTERFACE
19
- 12V
+ 12V
0.1
0.1
18
20
15
21
100
P
F
22
P
F
2K
X - OUT
MSB
LSB
14
9
74.7K
+ 5VD
0.1
0.1
0.1
- 12V
+ 12V
16 17
0.01
19
1
22
18
20
15
21
100
P
F
22
P
F
2K
IN9148
Y - OUT
IN9148
Figure 11. Complete Modem Circuit and Eye Pattern Generator
46.4K
4.7K
+5VD
+5VD
1800pF
11
15pF 5%
12
XTALI
XTALO
Third Overtone Crystal
10uH
15pF 5%
38.000MHz(KS16114)
68pF 5%
11
18pF 5%
12
Fundamental Crystal
24.000MHZ(KS16112)
38.000MHz(KS16114)
39pF 5%
OPTIONAL EYE PATTERN CIRCUIT