tea1065t NXP Semiconductors, tea1065t Datasheet - Page 19

• Manufacturer Part Number: tea1065t
• Description: Versatile Telephone Transmission Circuit With Dialler Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
March 1994
handbook, full pagewidth
Versatile telephone transmission circuit with
dialler interface
Voltage gain is defined as G
and MIC the MUTE input should be LOW or open-circuit, for measuring the DTMF
input MUTE should be HIGH. Inputs not under test should be open-circuit except VSI
that should be connected to V
C1
100 F
10 F
Fig.16 Test circuit for defining voltage gain of MIC , MIC and DTMF inputs.
V i
V i
v
= 20 Log V
EE
.
17
19
20
18
14
8
7
o
/V
IR
MIC
MIC
DTMF
MUTE
PD
VSI
i
. For measuring the gain from MIC
V CC
V EE
21
16
REFI
REG
13
22
620
C3
4.7
F
R1
TEA1065
DOC
AGC
12
23
118
R6
k
19
STAB
LN
1
9
3.6
R5
k
SLPE
VBG
CURL
GAS1
GAS2
GAR
11
QR
QR
24
DPI
R9
20
15
10
4
5
6
2
3
100
R4
k
R7
k
68
C7 1 nF
100 F
C6
100 pF
C4
100 pF
600
R L
Product specification
I line
MBA558
V o
TEA1065
140 mA
5 to