U4030B TEMIC Semiconductors, U4030B Datasheet - Page 2

• Manufacturer Part Number: U4030B
• Description: Telephone Speech Circuit
• Manufacturer: TEMIC Semiconductors

Pin Description
U4030B
2 (14)
Pin
V
V
CLIM
CK
ST
MICO
GR
RECO
MUTE
DTMF
1
2
3
4
5
6
7
8
9
M
C
Symbol
MUTE
RECO
MICO
CLIM
10
V
CK
1
3
5
8
V
ST
G
2
4
6
7
9
M
C
R
Supply voltage for an elecret
microphone, virtual ground
The internal 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 line
voltage
Time constant of anticlipping in
trans. path
Input of receive amplifier
Input of sidetone amplifier, must
be DC-coupled to V
Input for receive gain control
Output of receiving amplifier
Active high input to switch
circuit in DTMF-condition
Output of microphone amplifier
95
Function
17
20
19
18
16
15
14
13
12
11
M
RDC
SWAMP
PD
PRIVACY
V
GND
MIC2
MIC1
GT
V
L
D
Pin
10
11
12
13
14
15
16
17
18
19
20
PRIVACY Active high input to disable
SWAMP
Symbol
DTMF
MIC1
MIC2
GND
RDC
GT
V
PD
V
D
L
Input for DTMF signals (AC-
coupled). In mute condition a
small portion of the signal at this
pin is monitored to the receive
output
Input for transmit gain control
Inverting input of microphone
amplifier
Non-inverting input of
microphone amplifier
Ground (reference point for DC
and AC signals)
Line voltage
microphone amplifier
Power down input. Active high
input for reducing the current
consumption of the
circuit. Simultaneously V
shorted by an internal switch
A resistor connected from this
point to ground converts the
excess line current into heat in
order to prevent the IC from
thermal destruction at high line
currents
Input of power supply
Unregulated supply voltage for
peripheral circuits. Output
current capability and output
voltage increase with line current
Function
Rev. A2, 27-Jan-98
L
is