tea1085t NXP Semiconductors, tea1085t Datasheet - Page 20

• Manufacturer Part Number: tea1085t
• Description: Listening-in Circuit For Line-powered Telephone Sets
• Manufacturer: NXP Semiconductors

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(1) To TEA1060 (SLPE)
The DC current is divided as follows:
The pins not shown in the TEA1060 are left open. An impedance in series with pin SUP (e.g. an ammeter)
should be avoided as it interferes with the value of I
I
I
SUP
LN
=
=
V
------------------------------ -
I
SUP SREF
IN
R20
–
–
V
------------------------------ -
I line
SUP SREF
R20
–
C1
I CC
2
3
6
5
10
15
R1
TEA1060
9
LN
R5
I IN
A
.
I LN
16
C3
1
18
R20
8
7
R9
V LSI
I SUP
Fig.14 Test circuit.
19
5
6
4
(1)
1
V BB
2
24
(1)
3
C20
C21
(1)
14
18
C31
R35
TEA1085
TEA1085A
13
(1)
TEA1085
for
R34
20
(1)
V BB
12
(1)
TEA1085A
C26
R32
V BB
for
16
8
R33
C28
7
15
C25
R30
23
(1)
11
17
(1)
R36
10
21
22
R31
9
C24
V BB
V DTI
R29
R28
(1)
C27
R27
R26
R25 C22
V m
C23
R L
50
MGR043