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參數資料
| 型號： | U3762MB-MFNG3 |
| 英文描述： | Universal Telephone IC - All Functions Integrated |
| 中文描述： | 通用電話芯片-所有的功能集成 |
| 文件頁數： | 21/23頁 |
| 文件大小： | 248K |
| 代理商： | U3762MB-MFNG3 |
U3762MB
Preliminary Information
Rev. A1, 15-Sep-98
21 (23)
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
20
log
V
L
V
MIC
V
MIC
= 3 mV/1 kHz, S5 = open
Receiving gain
GR
20
log
V
RECO
V
L
RX-mode: V
gen
= 300 mV/1 kHz, S7b
Line-loss compensation transmit
GS
GS(at I
L
TX-mode: V
MIC
= 3 mV/1 kHz, S5 = open
73 mA)–GS(at I
L
20 mA)
Sidetone reduction
GSTA
20
log
V
L
V
RECO
(in TX–mode)
GR
TX-mode: V
MIC
= 3 mV/1 kHz, S5 = open
Line-loss compensation receive
GR
GR(at I
L
RX-mode: V
gen
= 300 mV/1 kHz, S7b
73 mA)–GR(at I
L
20 mA)
Gain change when muted
GRM
20
logV
RECO
V
L
(Mute
inactive)–20
logV
RECO
V
L
(Mute
active)
V
gen
= 100 mV/1 kHz, S5 = open, S8 = open
Input impedance of microphone amplifier
50 k
V
L(S6
closed)
V
L(S6
Ri
open)
–1
TX-mode: V
MIC
= 3 mV/1 kHz, S5 = open
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