u3762mb ETC-unknow, u3762mb Datasheet - Page 21

• Manufacturer Part Number: u3762mb
• Description: Universal Telephone Functions Integrated
• Manufacturer: ETC-unknow

Rev. A1, 15-Sep-98
Equations for Electrical Characteristic Parameters of the Speech Circuit
The equations refer to the basic test circuit. If not otherwise specified, the switches in the basic test circuit are inactive.
Transmit gain
GS
V
Receiving gain
GR
RX-mode: V
Line-loss compensation transmit
D
TX-mode: V
Sidetone reduction
GSTA
TX-mode: V
Line-loss compensation receive
D
RX-mode: V
Gain change when muted
GRM
V
Input impedance of microphone amplifier
TX-mode: V
Ri
MIC
GS
GR
gen
+
+
+
= 100 mV/1 kHz, S5 = open, S8 = open
+
+
= 3 mV/1 kHz, S5 = open
+
+
20
20
GS(at I
GR(at I
V
20
V
20
L (S6
L (S6
gen
MIC
MIC
gen
MIC
50 k
log
log
+
+
log
= 300 mV/1 kHz, S7b
= 300 mV/1 kHz, S7b
log
closed)
L
open)
= 3 mV/1 kHz, S5 = open
= 3 mV/1 kHz, S5 = open
L
= 3 mV/1 kHz, S5 = open
+
+
V
V
V
V
V
–1
73 mA)–GS(at I
V
MIC
V
RECO
73 mA)–GR(at I
RECO
L
V
RECO
L
L
L
(Mute
(in TX–mode)
+
Preliminary Information
inactive)–20
L
L
+
+
20 mA)
)
20 mA)
GR
log
V
V
RECO
L
(Mute
+
active)
U3762MB
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