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Unisonic Technologies

L6726 Datasheet Preview

L6726 Datasheet

UNIVERSAL SPEECH CIRCUIT

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UNISONIC TECHNOLOGIES CO., LTD
L6726
LINEAR INTEGRATED CIRCUIT
UNIVERSAL SPEECH
CIRCUIT
„ DESCRIPTION
The UTC L6726 is a mask-programmable, monolithic
integrated speech circuits for using in electronic telephones.
It is designed for using with a low impedance microphone.
Transmitting and receiving gain are regulated with line length.
Different regulation for various current feeds can be set by
external resistors. Typical current feeds as 48V 2·200, 48V,
2·400, and 36V, 2·500, can be handled. Application
dependent parameters such as line balance, side tone level,
amplification and frequency response are set by external
components. Parameters are set independently which means
easy adaptation for various market needs.
The UTC L6726 is developed for using with CMOS-type dialer
ICs. A separate DTMF input is switched when the circuit is
muted, and an adjustable DC supply is provided for feeding an
external CMOS device.
„ FEATURES
*Minimum number of inexpensive external components, 5
capacitors and 11 resistors.
*Mute function for operation with DTMF-generator.
*Transmit and receive gain regulation for automatic loop loss
compensation.
*Extended current and voltage range 5~130mA, down to 2V.
*Differential microphone input for good balance to ground.
*Balanced receiver output stage.
*Short start-up time.
*Stabilized DC-supply for low current CMOS dialers and/or
electret microphones.
*DTMF-input controlled by mute.
„ ORDERING INFORMATION
Ordering Number
Normal
Lead Free
L6726-D18-T
L6726L-D18-T
L6726-S18-R
L6726L-S18-R
L6726-S18-T
L6726L-S18-T
Package
DIP-18
SOP-18
SOP-18
*Pb-free plating product number: L6726L
Packing
Tube
Tape Reel
Tube
www.DataSheet4U.com
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
1 of 13
QW-R108-015,B




Unisonic Technologies

L6726 Datasheet Preview

L6726 Datasheet

UNIVERSAL SPEECH CIRCUIT

No Preview Available !

L6726
„ PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
+L 1
TO 2
TI 3
+C 4
Mute 5
GR 6
DCS 7
DCO
DCC
8
9
18 RE 2
17 RE 1
16 DR
15 RI
14 -L
13 MI 2
12 MI 1
11 MO
10 DI
„ PIN DESCRIPTIONS
Pin Pin
No. Name
Description
1
+L
Output of the DC-regulator and transmit amplifier. This pin is connected to the line through a polarity
guard and diode bridge.
Output of the transmit amplifier. This pin is connected through a resistor of 47 to 100to -L, which
2 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 TI Input of transmit amplifier. Input impedance 17k±20%
4
+C
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
5
Mute
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
6 GR Control input for the gain regulation circuitry.
7 DCS The sense input to the DC-supply.
8 DCO The output from the DC-supply.
9 DCC The control output from the DC-supply
10 DI The input for the DTMF-signal. Input impedance is 25k±20%
11 MO Output of the microphone amplifier or DTMF-amplifier
12
13
MI 1
MI 2
Input to the microphone amplifier. Input impedance 1.7k±20%
14 -L The negative power terminal, connected to the line though a polarity guard diode bridge
15 RI Input of receiver amplifier. Input impedance is approximately 38k±20%
16 DR The control input for the receiver amplifier driving capability.
17
18
RE 1
RE 2
Receiver amplifier outputs. Output impedance is approximately 3.
www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 13
QW-R108-015,B


Part Number L6726
Description UNIVERSAL SPEECH CIRCUIT
Maker Unisonic Technologies
Total Page 13 Pages
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