L6726
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
PIN DESCRIPTIONS
Pin
No. Name
Pin
Description
Output of the DC-regulator and transmit amplifier. This pin is connected to the line through a polarity
guard and diode bridge.
1
2
+L
Output of the transmit amplifier. This pin is connected through a resistor of 47 to 100Ω to -L, which
TO sets the DC-resistance of the circuit. The output has a low AC output impedance and the signal is
used to drive a side tone balancing network.
3
4
TI
Input of transmit amplifier. Input impedance 17kΩ±20%
The positive power supply terminal for most of the circuitry inside the UTC L6726 (about 1mA current
consumption).The +C-PIN shall be connected to a decoupling capacitor of 47μF to 150μF
When low, speech circuit is muted and the DTMF input is enabled. Maximum voltage (at mute) is
0.3V,current sink requirement of external driver is 50μA
+C
5
Mute
6
GR Control input for the gain regulation circuitry.
DCS The sense input to the DC-supply.
DCO The output from the DC-supply.
7
8
9
DCC The control output from the DC-supply
10
11
12
13
14
15
16
17
18
DI
The input for the DTMF-signal. Input impedance is 25kΩ±20%
MO Output of the microphone amplifier or DTMF-amplifier
MI 1
Input to the microphone amplifier. Input impedance 1.7kΩ±20%
MI 2
-L
The negative power terminal, connected to the line though a polarity guard diode bridge
RI
Input of receiver amplifier. Input impedance is approximately 38kΩ±20%
DR The control input for the receiver amplifier driving capability.
RE 1
Receiver amplifier outputs. Output impedance is approximately 3Ω.
RE 2
UNISONIC TECHNOLOGIES CO., LTD
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QW-R108-015, C
www.unisonic.com.tw
UTC [ Unisonic Technologies ]
