U2090B
| Model | U2090B |
| Description | Monolithic Integrated Feature Phone Circuit |
| PDF file | Total 34 pages (File size: 675K) |
| Chip Manufacturer | ATMEL |
U4090B
1
10
W
V
SAO
RDC
4.7 nF
50
W
I
MP
47
m
F 1000
m
F
2
3
4
5
6
7
8
9
10
11
12
13
14
47
m
F
15
16
17
680 k
W
68 nF
S5
V
BC556
ramp
18
19
V
20
V
RFDO
21
22
1
m
F
Figure 24. Ringing power converter
68 nF
10
m
F
Preliminary Information
100
m
F
40
39
38
37
36
35
34
33
32
31
30
29
28
27
V
RING
I
RING
V
MP
V
RING
1.5 V
20 V
S1
S2
S3
I
RING
ramp
S4
I
L
TELEFUNKEN Semiconductors
Rev. C1, 28-Oct-96
220
m
F
2.2 mH
SD103A
20.6 V
DC
DC
DC
94 9138
30 (34)
V
SAI
1.8 V
pp
1 kHz
100 nF
RGSA
26
25
24
23
62 k
W
1) Max. output power: PSA =
Vsao
2
(S4 closed)
RSAO
2) Threshold of ringing frequency detector:
detecting VRFDO, when driving VRING from 2 V to 22 V (VRINGON)
and back again (VRINGOFF) (S2 = closed)
VRING
3) Input impedance: RRING =
(S3 = closed)
IRING
4) Input impedance in speech mode (IL > 15 mA):
RRINGSP = Vring (S1 = closed)
Iring
5) Ring detector enable: detecting VRFDO, when driving VMP from 0.7 V to 3.3 V
(VMPON) and back again (VMPOFF) (S5, S3 = closed)
Open pins should be connected as shown in figure 25
44
43
42
41
U4090B
