U4084B Datasheet, PDF (2/26 Pages) TEMIC Semiconductors – Low-Voltage, Voice-Switched Circuit for Hands-Free Operation

U4084B
Block Diagram
MIC
8
MUTE
–
V_{B +}
9
MICO TLI2
7 14
CPT
13 _Background-
noise monitor
15
TLO2
16
RLO2
4
V_S
Level
detectors
1
GND
3
CD
400 Ω
12
V_B
11 17
C_T RLI2
TI
TO
6
5
T attenuator
V_S
AGC
Background-
noise monitor
Attenuator
control
Dial tone
detector
+–
Level
detectors
24
CPR
20
TLI1
22
RLO1
22
TLO1
V_B
R attenuator
U4084B
19
18 10
23
RECO RI VCI RLI1
12626
Figure 1. Block diagram
2 (26)
TELEFUNKEN Semiconductors
Preliminary Information
Rev. A1, 31-Jan-97