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PDF UTCL6726 Data sheet ( Hoja de datos )
| Número de pieza | UTCL6726 | |
| Descripción | UNIVERSAL SPEECH CIRCUIT | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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UTCL6726 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.
DIP-18
UTC
UNISONIC TECHNOLOGIES CO., LTD. 1
QW-R108-015,A
1 page  
www.DataSheet4U.com
UTCL6726 LINEAR INTEGRATED CIRCUIT
RL=0~4KΩ
5H+5H
RLoad
=400Ω+400Ω
C1
1μF
+
E=50V
V2
V1
Uz=(15 ~16)V
+
600Ω
MUTE
VM
IL
+LINE MIC
DTMF UTC 6726
VL
IDC
with external
component
see fig 3
REC
VDC
-LINE
V4
ZMIC=350 Ω
V3
ZRec=350 Ω
Figure 2. Test setup with rectifier bridge
+Line
DTMF
input
C8
220nF
MIC R16
350Ω 27k
DC supply OUT
CMOS device
MUTE
10 AD
12
13 AM
DC
897
Sense input
Control output
+
47μF
C7
Note : * Not used in test setup
1
UTC 6726
AT AR
17
R14
310Ω
18
REC
350 Ω
5 11 3
2
15 14 6 14 4
C4
R4
18k
C3 R7 47nF
100nF 910 Ω R11
3kΩ
R10
82k
910 Ω R3
R5 R6 560Ω R8
R1 *
+
22k 75 Ω
R13 47μF C1
R9
11k
C5 11k R15 R2 *
10 Ω
100nF
C2
15nF
-Line
Figure 3. Circuit with external components for test setup.
FUNCTIONAL DESCRIPTION
The gain of the transmitting and receiving amplifiers are continuously and euqually changed with the line length.
The starting point for the gain regulation is externally set .The gain regulation can be cut-off externally, see table
under gain regulation below.
The outputs of the transmitting and receiving amplifiers have internals limitations of the output amplitudes.
UTC
UNISONIC TECHNOLOGIES CO., LTD. 5
QW-R108-015,A
5 Page 
www.DataSheet4U.com
UTCL6726 LINEAR INTEGRATED CIRCUIT
+Line
R10 R12 C6
2
R11
15
RA RB
Low impedance
R6 Rc network.
Figure 9. Typical sidetone network
2
R6
+Line
Zbal
C6 15
R12
C * To get flat response
for receiving
Figure 10. Sidetone network especially
suited for applicatons with a high line
current,when R6 has a low value
R14
17
18
Figure11. Magnetic reciever connection
12
MIC
13 AM
11
50k 50k
-Line
Figure 13. Additional components for
extended low current/voltage oeration
12
200Ω
200Ω
1μF
1μF
4
12
13
14
Figure 12. Electret microphone with FET buffer
12
13
Figure 14. Connection of a magnetic
microphone
17
13
Figure 15. Connection of a dynamic microphone
18
Figure 16. Dynamic reviever connection
UTC
UNISONIC TECHNOLOGIES CO., LTD. 11
QW-R108-015,A
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet UTCL6726.PDF ] | |
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