U4082B Datasheet, PDF (23/30 Pages) ATMEL Corporation – Low-voltage Voice-switched IC for Hands-free Operation

U4082B
Figure 8-2. Typical Output Swing versus V_S
6
5
4
3 TO
2
1
RO
MICO
HTO -,
HTO +
TO, RO
FO
0
3
4
5
6
V_S (V)
Figure 8-3. Basic Clock Diagram for Design Purposes
MIC amp.
MICO
I₁
R₁
TI
TO
T attenuator
TLI2
-
Acoustic
+
coupling
+
-
RLI2
Comparator
Comparator
C1
Attenuator
control
C2
I₃
R₃
R attenuator
SAO
RECO
RI
Speaker amp.
Hybrid amp.
HTO-/HTO+
R₂
I₂
TLI1
G_HIT
-
+
Tip
G_{ST Hybrid}
+
Ring
-
RLI1
G_HR
R₄
I₄
FO
FI
Filter
• G_ST is the side tone gain, measured from HTO–/HTO+ to the filter input (measured at
0.18 V/V, or –15 dB)
• G_HR is the gain from Tip/Ring to the filter input for receive signals (measured at 0.833V/V or
–1.6 dB)
• G_FO is the gain of the filter stage, measured from the input of the filter to RI, typically 0 dB
• G_R is the gain of the receive attenuator measured from RI to RECO
• G_SA is the gain of the speaker amplifier, measured from RECO to the differential output of the
U4083B (typically 22V/V or 26.8 dB)
• G_AC is the acoustic coupling, measured from the speaker differential voltage to the
microphone output voltage
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4743D–CORD–03/06