U3761MB-AFNG3 TEMIC [TEMIC Semiconductors], U3761MB-AFNG3 Datasheet - Page 21

• Manufacturer Part Number: U3761MB-AFNG3
• Description: Low Voltage Standard Telephone Circuit with 13 Memories
• Manufacturer: TEMIC [TEMIC Semiconductors]

TELEFUNKEN Semiconductors
Rev. A2, 23-Apr-97
Formulas for Parameters of Elecrtrical Characteristics of Speech Circuit
Formulas referred to the basic test circuit. If not otherwise specified switches in basic test circuit are inactive.
Transmit gain
GS
VMIC = 3 mV/1 kHz, S5 = open
Receiving gain
GR
RX-mode: VGEN = 300 mV/1 kHz, S7b
Line loss compensation transmit
D
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Sidetone reduction
GSTA
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Line loss compensation receive
D
RX-mode: VGEN = 300 mV/1 kHz, S7b
Gain change when muted
GRM
VGEN = 100 mV/1 kHz, S5 = open, S8 = open
Input impedance of microphone amplifier
TX-mode: VMIC = 3 mV/1 kHz, S5 = open
Ri
GS
GR
+
+
+
+
+
+
+
20
20
GS(at IL
VL (s6
GR(at IL
VL (S6
20
20
50 k
+
+
log
log VRECO
closed)
log VRECO
open)
log
+
+
VMIC
–1
VRECO
VL
73 mA)–GS(at IL
VL
VL
73 mA)–GR(at IL
VL
(Mute
(in TX–mode)
Preliminary Information
+
inactive)–20
+
+
20 mA)
20 mA)
)
GR
log VRECO
VL
(Mute
+
active)
U3761MB
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