U4084B TEMIC [TEMIC Semiconductors], U4084B Datasheet - Page 18

• Manufacturer Part Number: U4084B
• Description: Low-Voltage, Voice-Switched Circuit for Hands-Free Operation
• Manufacturer: TEMIC [TEMIC Semiconductors]

Figure 19. Power supply rejection of the microphone amplifier
U4084B
18 (26)
Acoustic
coupling
94 7870 e
MIC amp.
60
40
20
0
0
I
I
RLI2
1
3
MICO
SAO
R
R
Speaker amp.
1
3
+
+
–
–
f ( kHz )
1
C
VB
Figure 21. Basic block diagram for design purposes
= 1000
Preliminary Information
= 220
MICO,
Comparator
m
m
C1
F
F
RECO
TI
10
T attenuator
R attenuator
Attenuator
control
94 7872 e
Comparator
TO
RI
Figure 20. Typical output swing versus V
6
5
4
3
2
1
0
C2
3
RO
TO
4
TELEFUNKEN Semiconductors
ext. Transmit. amp.
V
+
+
–
–
S
( V )
ext. Receive amp.
5
R
R
MICO
2
4
G
ST
Rev. A1, 31-Jan-97
RLI1
TLI1
TO,RO
I
I
4
2
12677
6
Hybrid
S
Ring
Tip