U2090B
| Model | U2090B |
| Description | Monolithic Integrated Feature Phone Circuit |
| PDF file | Total 34 pages (File size: 675K) |
| Chip Manufacturer | ATMEL |
open
V
M
V
MP
V
MP
10
m
F
RGR
ZEAR
S3
30
29
28
27
26
25
24
23
100
m
F
I
M
62 k
W
RAGA
VZEAR, dr
open
Mico
V
L
220 nF 150 nF 1
m
F
1
68 nF
10
m
F
V
DTMF
4.7 nF
2
10
W
I
L
V
22
m
F
S1
b
V
GEN
AC
a
V
LR
220
m
F
1000
m
F
47
m
F
3
4
5
6
7
8
9
10
11
12
13
14
15
I
MP
16
17
18
19
20
21
1
m
F
22
Figure 21.
RGT
220 nF
V
1 k
W
RDC 600
W
V
MP
open
S2
Preliminary Information
U4090B
Mute suppression:
open pins should be connected as shown in figure 25
V
M
Line loss compensation:
D
GRI = GR (at IL = 100 mA) –GR (at IL = 14 mA), S3 = closed
Receiving noise: S1a
Receive amplification: GR = 20*log ( VZEAR/VLR) dB (S1 = b, S2 open)
DTMF-control signal: GRM = 20*log (VZEAR/VDTMF) dB (S1 =a, S2 = closed)
AC-impedance: (VLR/ (VGEN – VLR)) * ZL
a) RECATT:
D
GR = 20*log (VLR/VZEAR) dB +GR, MUTR = open
b) RA2:
D
GR = 20*log (VLR/VZEAR) dB + GR, MUTR = VMP
c) DTMF operation:
D
GR = 20*log VLR/VZEAR) dB + GR, MUTX = VMP
94 9134
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
41
40
39
38
37
36
35
34
33
32
31
44
43
42
U4090B
27 (34)
