U4030B Datasheet, PDF (2/14 Pages) TEMIC Semiconductors – Telephone Speech Circuit

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