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PDF L6726 Data sheet ( Hoja de datos )
| Número de pieza | L6726 | |
| Descripción | UNIVERSAL SPEECH CIRCUIT | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L6726 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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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 2·200Ω, 48V,
2·400Ω, and 36V, 2·500Ω, 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
1 page  
L6726
FUNCTIONAL DIAGRAM(Cont.)
LINEAR INTEGRATED CIRCUIT
+Line
DTMF
input
C8
220nF
MIC R16
350 27k
DC supply OUT
CMOS device
MUTE
10 AD
12
13 AM
DC
897
Sense input
Control output
+
47 F
C7
Note : * Not used in test setup
1
UTC 6726
AT AR
1
7
R14
310
1 REC
8 350
5 11 3
2
R4
18k
C3 R7
100nF 910
R5 R6 560
22k 75
R9
11k
C4
47nF
R11
3k
R8
15 14 6
R13
C5 11k R15
10
14 4
R10
82k
910
R1 *
47 F
R2 *
100nF
R3
+
C1
C2
15nF
-Line
Figure 3. Circuit with external components for test setup.
www.DataSheet4U.com
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 13
QW-R108-015,B
5 Page 
L6726
LINEAR INTEGRATED CIRCUIT
APPLICATION INFORMATION(Cont.)
DESIGN PROCEDURE:
1. Circuit impedance to the line.
2. DC-characteristic
3. Gain regulation.
4. Transmitter gain and frequency response.
5. Receiver gain and frequency response.
6. Side-tone.
7. Components to suppress radio interference, specially the wires up to the handset.
Others:
The circuit can be placed either in the telephone or in the handset.
Cut off the transmitter can be done at F1 without interference of other functions of the circuit.
When using the extended low current and low voltage range (5mA, 2V), two resistors have to be connected from the
microphone inputs to ground as shown in figure 13.
11 3
11 3
RA CA RA CA
2
RA
15
R11 R10 +Line
RB
CB R6 RB
11 3
11 3
RA
CA
CB
RA
CA
RB RB
CB
11 3
RA CA
RB
11 3
CA
RA CA
RB
11 3
11 3
RA
RA CA
www.DataSheet4U.com
CA
RB CB RB CB
Figure 7. Examples of network "2"
2
15
RA R11 R10 +Line
RB
R6 RC
CA
2
RA
RB
15
R11
CB
R10 +Line
R6 RC
CA
Figure 8. Examples of network "4"
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
11 of 13
QW-R108-015,B
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet L6726.PDF ] | |
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