U4084B Datasheet, PDF (15/26 Pages) TEMIC Semiconductors – Low-Voltage, Voice-Switched Circuit for Hands-Free Operation

U4084B
20
10
0
v_i = 10 mV
– 10
– 20
v_i = 40 mV
– 30
– 40
100
93 7770 e
1000
f (Hz)
10000
Figure 11. Level-detector AC transfer characteristics
versus frequency
10
0
– 10
– 20
Receive mode
– 30
– 40
0.1
93 7771 e
← Minimum recommended level
0.3
0.5 0.7
0.9
1.2
VCI/V_B
Figure 12. Receive attenuator versus volume control
10
0
– 10
– 20
– 30
– 40
2.8
93 7772 e
3
3.2
3.4
3.6
V_S (V)
Figure 13. Receive attenuation gain versus V_S
120
120
100
100
80
80
60
60
40
40
Gain
20
20
0
0
0
1
10
100
1000
94 7871 e
f ( kHz )
Figure 14. Microphone amplifier open loop gain and phase
versus frequency
TELEFUNKEN Semiconductors
Rev. A1, 31-Jan-97
Preliminary Information
15 (26)