u4037b-n ETC-unknow, u4037b-n Datasheet - Page 2

• Manufacturer Part Number: u4037b-n
• Description:
  c-controlled Speech And Ringer Circuit
• Manufacturer: ETC-unknow

Pin Description
U4037B-N
2 (7)
Pin
1
2
3
4
5
MU/VOL2
TXACL
VRING
DTMF
MICO
OUT2
VOL1
TXACL Time constant of anti-clipping in
AGA
VMP
Symbol
DTMF
MEL
MICO
AGA
PD
ST
ST
10
12
11
1
2
3
4
5
6
7
8
9
Output of microphone preamplifier
Sidetone reduction input
input resistance is approx. 25 k
transmit path
Automatic gain adjustment with line
current, a resistor connected from
this pin to GND sets the starting
point maximum gain change: 6 dB.
Input for DTMF signals
Figure 1. Pinning
Function
16276
Preliminary Information
19
18
17
16
15
14
13
24
23
22
21
20
MIC2
MIC1
RECO2
RECO1
RIF
RECIN
VB
IMP
GND
VL
IND
OUT1
Pin
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
6
7
8
9
VRING Input for ringersupply voltage
RECO1 Output of receiving amplifier
RECO2 Inverting output of receiving ampl.
Symbol
RECIN
VOL1
VOL2
OUT2
OUT1
MIC1
MIC2
VMP
GND
MEL
MU/
IND
IMP
RIF
VL
VB
PD
2-bit volume adjustment for tone
ringer
1. 2-bit volume adjustment for tone
2. Mute of microphone amplifier:
– Speech condition,
– DTMF condition
Input for melody
Active high input for reducing the
current consumption of the circuit,
simultaneously V
internal switch
Regulated supply voltage 3.4 V for
peripheral circuits (esp. micropro-
cessors), minimum output current:
2 mA (ringing) 4 mA (speech mode)
Differential output for tone ringer
Differential output for tone ringer
The internal equivalent inductance
of the circuit is proportional to the
value of the capacitor at this pin, a
resistor connected to ground may be
used to reduce the DC line voltage
Line voltage
Reference point for DC- and AC-
output signals
Impedance adjustment
Unregulated supply voltage for
peripheral circuits (voice switch),
limited to typically 7 V
Receiver input
Pin for adjustment of frequency
response and gain of receiver
Inverting input of microphone ampl.
Non-inverting input of microphone
amplifier
ringer
input MU/VOL2 low
DTMF signal at Pin 5 is fed to
input MU/VOL2 high
the line. A part of the DTMF-
signal is passed to the receiving
amplifier as a confidence signal
during dialing.
Function
L
Rev. A3, 06-Mar-01
is shorted by an