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參數(shù)資料
| 型號： | U4037B |
| 英文描述： | LOW VOLTAGE SPEECH CIRCUIT WITH TONE RINGER INTERFACE |
| 中文描述： | 低電壓語音電路的音調振鈴接口 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 70K |
| 代理商： | U4037B |
U4037B
Preliminary Information
TELEFUNKEN Semiconductors
Rev. A1, 08-Oct-96
3 (6)
Pin Description
Pin
Symbol
OUT
MELI
RECO1
RECO2
Function
Buzzer output
Melody input
Output of the receiver amplifier
Suitable for dynamic or piezoelec-
tronic transducers
Ground
The output of the sidetone can-
cellation signal, which requires a
balanced impedance of 8 to
10 times the subscribers line
impedance to be connected to
Pin V
L
.
Input to the line output driver
amplifier, transmit a.g.c. applied
to this stage
Transmit pre-amplifier output
Inputs of symmetrical microphone
amplifier with high common mode
rejection ratio
Regulated output voltage of for
biasing the MCU
Receive amplifier input
The receiving amplification is
regulated by an a.g.c.
Positive supply voltage input to
the device
The current through this pin is
modulated by the transmit signal.
GND
ST
TIN
MICO
MIC 1,
MIC 2
V
DD
RECIN
V
L
Pin
Symbol
SWAMP
Function
An external resistor (1 W) is
required from this pin to GND to
control the dc input impedance of
the circuit. It has a nominal value
of 56 for low voltage operation.
Volume adjustment of ringer and
earphone amplifier
Output for ringing frequency
detection
This internal voltage bias line
must be connected to V
L
via an
external resistor, R
B
, which domi-
nates the ac input impedance of
the circuit and should be 620
for an 600 input impedance or
910
for a 900
input
impedance.
The range of transmit and receive
gain variations between short and
long loops may be adjusted by
connecting a resistor R
AGC
from
this pin to (GND). This pin can be
left open to set a.g.c. out of action.
DTMF input
Control input for DTMF operation
Ringer supply
Input for setting the DC
characteristic
VOI1
VOI2
RFO
V
I
R
AGC
DTMF
MUTE
VB
RDC
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