L3234 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
L3234 Datasheet PDF : 26 Pages
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L3234 - L3235
THERMAL DATA
Symbol
Description
Rth j-amb Thermal Resistance Junction-ambient
Value
Max
80
Unit
°C/W
PIN DESCRIPTION
Pin
Name
Description
1
Vbat
Negative Battery Supply Input.
2
RING
RING wire of 2 Wire Line Interface.
3
ZAC
Non Inverting Input of the AC Impedance Synthesis Circuit.
4
VREG
Emitter Connection for the External Transistor.
5
AGND
Analog/Digital Ground.
6
BGND
Battery Ground. This is the Reference for the Battery Voltage (note 1).
7
CAC
AC Current Feedback Input.
8
RPC
External Protection Resistors AC Transmission Compensation.
9
TX
Four Wire Transmitting Amplifier Output.
10
ZB
Non Inverting Operational Input Inserted in the Hybrid Circuit for 2W to 4W
Conversion. The Network Connected from this Pin to Ground shall be a copy
of the Line Impedance.
11
ZA
VRX Output Buffer 2W to 4W Conversion.
12
RX
High Impedance Four Wire Receiving Input.
13
VCC
Positive 5V Supply Voltage.
14
REF
Voltage Reference Output; a Resistor Connected to this pin sets the Internal
Bias Current.
15
VSS
Negative 5V Supply Voltage.
16
IL
Transversal Line Current Feedback Divided by 50.
17
VPOL
Non Inverting Operational Input to Implement DC Character.
18
BASE
Driver for External Transistor Base.
19
LIM
Voltage Reference Output; a Resistor Connected to this Pin Sets the Value of
Line Current Limitation.
20
RNG
Ringing Logic Input from Line Card Controller.
21
SBY
Stand by Logic Input (SBY = 1 Set Line Current Limitation at 3mA).
22
PU
Power u.p Logic Output for the Codec Filter. (PU = 0 means Codec Filter
Activated)
23
CS
Ring Injector Enable for L3234 Output. (CS = 1 means L3234 Ringing
Injection Enable).
24
OH
Hook Status Logic Output (OH = 0 means off hook).
25
GDK
Ground Key Status Logic Output (GDK = 0 means Ground Key on).
26
RTF
Time Constant Hook Detector Filter Input.
27
GKF
Time Constant GK Detector Filter Input.
28
TIP
Tip Wire of 2 Wire Line Interface.
Note 1:
AGND and BGND pins must be tied together at a low impedance point (e.g. at card connector level).
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