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PDF AN6425K Data sheet ( Hoja de datos )
| Número de pieza | AN6425K | |
| Descripción | Speech Network Circuit | |
| Fabricantes | Panasonic Semiconductor | |
| Logotipo |  |
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AN6425K
Speech Network Circuit
s Overview
The AN6425K is a high-function speech network IC with
speaker amplifier. It incorporates a transmitter-system non-lin-
ear circuit, receiver digital VRs, etc. and is suitable for realiz-
ing the multifunctional telephone sets.
s Features
• Speech network IC for the multifunctional telephone sets
• Capable of interfacing with the light-weight small receivers
and ECM transmitters
• Built-in 2V REG constant voltage source (2V typ) for ECM
• Built-in non-linear circuits in the transmitter and receiver
systems in order to eliminate ambient noises
• Built-in speaker amplifier and capable of driving with a main
wire current
• Built-in hold-tone amplifier, key-in-tone amplifier, and
DTMF transmitter, and capable of setting the mode with the
control pins
• Automatic gain control (automatic pad function) according to
a circuit curret
• Built-in tertiary active filter circuit and capable of sending a
DTMF circuit with much higher harmonic at a low distortion
factor
• Built-in single touch receiver volume-up function (about
6dB)
Unit : mm
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
1.05±0.25
8.4±0.3
4.8±0.25 3.05±0.25
3 to 15˚
10.16±0.25
0.3+–0.01.05
28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B)
s Block Diagram
VL
28 27 26 25 24 23 22 21 20 19 18 17 16 15
80kΩ
SP
Amp.
CLASS A
Push pull
CLASS B
BTL
+
REC
DRIVER
–
+
REC
DRIVER
–
30kΩ
1V
30kΩ
2kΩ
2kΩ
2V REG
2V
– D5dB D3dB
+ D6dB
REC
in
DVR
40kΩ
4kΩ
KT
HT
1V REFF
1V
VL
Battery
Selector
65kΩ
SEND D12
Amp dB
MUTE
Filter
Amp.
TT
in
MIC
D3dB in
Logic
INV
NAND
1 2 3 4 5 6 7 8 9 10 11 12 13 14
GND
1 page  
s Pin Descriptions (cont.)
Pin No. Pin name Typical waveform
Description
KT/HT input
17
DVR input
KT/HT
1V
0V
Digital VR ON
KT/HT signal input pin,
Digital VR ON Pin.
Inputs a KEY IN TONE or HOLD
TONE signal. If the Pin14 is set to Low,
the KT signal is output to the receiver,
and if the Pin13 is set to Low, the HT
signal is output to the curcuit and speak-
er. The receiver gain is improved 6dB
by setting this pin to Low instantaneous-
ly.
Equivalent circuit
VCC
30kΩ
45kΩ
VCC
16
Vref
+
–
4kΩ
18 REC input
19 REC NFB
20 REC output
21
Driver
input
22
Driver
output (1)
23
Driver
output (2)
24 SP input
Receiver signal input pin.
1V Inputs a receiver signal from the side
tone preventive circuit network.
VCC
18
Vref
Receiver gain control pin,
Receiver signal output pin.
1V Capable of controlling the frequency
characteristic and gain of the receiver
system with the external parts C and F
of the Pins19 and 20. The receiver sig-
1V nal/HOLD TONE signal/KEY IN TONE
signal is output to the Pin20 by the
HC/DMC/SPC control.
VCC
VCC
19
82kΩ
VCC
–
+
VCC
20
1V
Receiver amplifier signal input pin,
Receiver output (1) pin,
1V Receiver output (2) pin.
Inputs a receiver signal from the Pin20
to the Pin21. BTL output at the Pins20
1V and 23.
Speaker amplifier signal input pin.
1V Inputs a receiver signal from the Pin20.
VCC
22
VCC
23
VCC
+
– 2kΩ
2kΩ
Vref
Vref
2kΩ
+
–
2kΩ
21
VCC
24
Vref
10kΩ
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AN6425K.PDF ] | |
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