U2090B
| Model | U2090B |
| Description | Monolithic Integrated Feature Phone Circuit |
| PDF file | Total 34 pages (File size: 675K) |
| Chip Manufacturer | ATMEL |
Mico
V
MP
10
m
F
100
m
F
ZEAR
I
M
62 k
W
V
L
V
M
open
1
220
m
F
1000
m
F
47
m
F
2
3
4
5
6
7
8
9
10
11
12
13
14
15
I
MP
16
17
18
19
20
21
22
68 nF
10
m
F
V
DTMF
I
L
RDC
4.7 nF
V
VL: S3 = closed
10
W
Figure 23. DTMF amplifier
RGT
1
m
F
Preliminary Information
40
39
38
37
36
35
34
33
32
31
30
29
28
220 nF
1k
W
V
V
M
S3
50 k
W
VL 50k
W
: S3 = open
d
D
DTMF-amplifier: 20log (VL/VDTMF) dB
W
Input resistance: (VL50K / (VL – VL50k)) * 50k
Open pins should be connected as shown in figure 25
V
GEN3
U4090B
AC
94 9136
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
27
26
25
24
23
220 nF 150 nF 1
m
F
RGR
44
43
42
41
U4090B
29 (34)
