Panasonic AN6425K Datasheet

Overview
The AN6425K is a high-function speech network IC with speaker amplifier. It incorporates a transmitter-system non-lin­ear circuit, receiver digital VRs, etc. and is suitable for realiz­ing the multifunctional telephone sets.
Features
Speech network IC for the multifunctional telephone sets
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)
AN6425K
Speech Network Circuit
Unit : mm
1 2 3 4 5 6 7 8
9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
26.7±0.3
0.5±0.1
3 to 15˚
8.4
±0.3
0.9±0.25
1.778
4.8±0.25
28-pin Shrunk DIL Plastic Package (SDIP028-P-0400B)
3.05±0.25
10.16±0.25
0.3
+0.1
– 0.05
1.05±0.25
Block Diagram
VL
28 27 26 25 24 23 22 21 20 19 18 17 16 15
CLASS B BTL
SP Amp.
CLASS A Push pull
2V REG
2V
1V
1 2 3 4 5 6 7 8 9 10 11 12 13 14
1V REFF
Battery
Selector
+
REC DRIVER
30k
1V
VL
SEND
Amp
65k
REC
DRIVER
30k
D12 dB
+
MUTE
GND
80k
– +
2k2k
Filter Amp.
D6dB
D5dB
D3dB
DVR
D3dB
KT
TT
HT
in
MIC
REC
40k
in
in
4k
Logic INV NAND
V
L
I
L
P
D
T
opr
T
stg
Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature
V
mA
mW
˚C ˚C
Parameter Symbol Rating Unit
Absolute Maximum Ratings (Ta=25˚C)
14.4
*
120
*
1200
*
–20 to + 65
–55 to +150
*
VCC × ICC <1200mW
Parameter Symbol Range
Recommended Operating Range (Ta=25˚C)
Operating supply voltage range
V
L
3 to 12V
Parameter Symbol Condition min typ max
Electrical Characteristics (Ta=25˚C)
G
V
(REC)
Open between the Pins19 and 20. Measure the output between the Pins22 and 23 when a sign­al (–55dBm) is input to the Pin18.
Receiver distortion factor
THD
(REC)
%1
Open between the Pins19 and 20. Measure the out­put distortion factor between the Pins 22 and 23 when a signal
(–55dBm) is input to the Pin18.
Receiver maximum output voltage
V
O
(REC)
dBm+3
D Automatic pad
AP
(REC)
dB
Input a signal (–45dBm) to the Pin18 and mea­sure an output change between the Pins22 and 23 when I
L
changes from 80mA to 30mA.
MUTE
(REC)
Input a signal
(–45dBm)
to the Pin18 and measure an output change between the Pins 22 and 23 when the Pin12 changes from no microphone input signal to –40dBm.
dB
Input a signal
(–45dBm)
to the Pin18 and measure an output change between the Pins 22 and 23 when the Pin12 is set from H to L.
Receiver D digital VR
DVR
dBm–50
Measure the output between the Pins22 and 23 when there is no signal at the Pin18.
–3
Receiver noise output
V
no
(REC)
dB42.5
Open bitween the Pins3 and 6. Measure the output between the Pins28 and 1 when a signal (–45dBm) is input to the Pin12.
Transmitter gain
G
V
(SEND)
%
Transmitter distortion factor
THD
(SEND)
dBm5
Open between the Pins3 and 6. Measure the output distortion factor between the Pins28 and 1 when a signal
(–45dBm) is input to the Pin12.
Transmitter maximum transmission level
V
O
(SEND)
dB–3 –1.5
–60
29.5
45
5
–1.5
5
8
–45
–6
2
40
Receiver gain
53 dB50.548
0
–6
D Receiver noise prevention
dB–5 –3–7
4
Transmitter D automatic pad
AP
(SEND)
Input a signal (–35dBm) to the Pin12 and measure an output change between the Pins 28 and 1 when I
L
changes from 80mA.
dBm–65
Measure the output between the Pins28 and 1 when there is no signal at the Pin18.
Transmitter noise prevention
V
no
(SEND)
dB26.5
HOLD TONE gain
G
V
(HOLD)
dB41.5
Ground the Pin24. Input a signal (–30dBm)
to the Pin17 and measure the
output change between the Pins 28 and 1.
TOUCH TONE gain
G
V
(TOUCH)
%1
Ground a signal (–45dBm) to the Pin16 and measure the out­put between the Pins28 and 1.
3
44
6
1.5
39
23.5
TOUCH TONE distortion factor
THD
(TOUCH)
Ground the Pin14. Input a signal (–45dBm) to the Pin16 and measure the output distor­tion factor between the Pins 28 and 1.
Unit
Input a signal to the Pin18 and measure the output between the Pins22 and 23 at an output distortion factor of 5%.
Input a signal to the Pin12 and measure the output between the Pins28 and 1 at an output distortion factor of 5%.
*
IL=30mA and Freq=1kHz unless otherwise specified.
Parameter Symbol Condition min typ max
Electrical Characteristics (cont.) (Ta=25˚C)
dB–3 –1.5–6
TOUCH TONE D automatic pad
AP
(TOUCH)
Ground the Pin14. Input a signal (–45 dBm) to the Pin16 and measure an out­put change between the Pins 28 and 1 when I
L
changes from 80mA to 30mA.
dB5045
SP amplifier gain
G
V
(SP)
Ground the Pin15. Input a signal (–50dBm) to the Pin24 and measure the output between the Pins 25 and 26.
%10
SP distortion factor
THD
(SP)
Ground the Pin15. Input a signal
(–50dBm) to the Pin24 and measure the output distor­tion factor between the Pins 25 and 26.
Unit
*
I
L
=30mA and Freq=1kHz unless otherwise specified.
Pin Descriptions
1
2
3
4
5
6
7
GND
2V REG
1V REF
BT
1/2V
L
Ground pin. Connect to the output of the diode bridge.
2V internal stabillized power supply output pin. Connect to GND via 220µF. The current obtainable from this pin is 5mA or less (at I
L
=20mA).
1V reference coltage output pin. Connect to GND via 47µF. No current is allowed to be input/output from this pin.
External battery connection pin. Connect the 3 to 6V battery to GND. Connect to GND directly when the BT function is not used.
Transmitter output. Transmitter gain control pin. Controls the gain and frequency charac­teristic of the transmitter system with external C and R.
Automatic pad control pin. Capable of controlling the pad operating point with the external resistor.
Typical waveform
Description Equivalent circuitPin No. Pin name
SEND OUTPUT
SEND DRIVER
DC 0V
DC 2V
DC 1V
DC
0.3V
DC 0 to 6V
(Supplied from Outside)
5/7 × V
L
V
ref
2V REG
2
3
+
V
CC
10k
1V
5
V
CC
V
L
Vref
65.3k
6
V
L
20k
47k
7
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