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PDF LA8580W Data sheet ( Hoja de datos )
| Número de pieza | LA8580W | |
| Descripción | Compander + I/O Switching Telephone Audio Signal-Processing IC | |
| Fabricantes | SANYO Electric | |
| Logotipo |  |
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Ordering number : ENN7737
www.DataSheet4U.com
Monolithic Linear IC
LA8580W
Compander + I/O Switching Telephone Audio
Signal-Processing IC
Overview
The LA8580W is an I/O switching audio signal-
processing IC for low-power cordless telephone base sets.
It also supports personal fax machines for the Japanese
domestic market. It integrates an extensive set of
functions, including a compander, a crosspoint switch for
I/O switching, an electronic volume control, and level
switching, ALC, VOX, and filter circuits.
Applications
Low-power cordless telephone base sets and Japanese
market home fax machines.
Functions
• Crosspoint switch (equivalent to 10 × 9) and electronic
volume control (VOL)
• Audio level switching (ATT) for the telephone circuit
system, the handset system, both DSP systems, the
doorphone system, and the microphone system
• Dedicated ring-tone input pin (OSC-IN), ring-tone level
switching (OSC-ATT), ring-tone muting (OSC-SW)
• ALC amplifier, audio level detection (VOX),
operational amplifiers for the DSP I/O filters.
• Compressor, limiter (IDC), compressor system muting,
splatter filter.
• Expander, receive system input filter amplifier, and
expander system muting
• Receive system data waveform shaping (with threshold
follower on/off function)
• Serial interface (8-bit serial data input)
• Built-in electronic volume control (about 2 dB per step
over 15 steps) and extensive set of level switching
circuits allow this IC to easily switch signals with a wide
range of levels.
• A compander circuit, which provides noise reduction
during communication, is built in. This circuit can also
be used for noise suppression and improved audio
quality in wireless communication systems.
• Built-in splatter filter (fifth order Butterworth filter with
settable center frequency) for reduced parts counts.
Package Dimensions
unit: mm
3190A-SQFP64 (0.5 mm lead pitch)
[LA8580W]
12.0
10.0
48 33
49 32
64
1
(1.25)
(0.5)
16
0.18
17
0.15
SANYO: SQFP64
Features
• Includes a 10 input system/9 output system crosspoint
switch that supports mixing. Systems that provide
flexible and complex switching of signal paths can be
implemented easily.
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
32204TN (OT) No. 7737-1/26
1 page  
Test Circuit
LA8580W
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Power supply
Unit (resistance: Ω, capacitance: F)
No. 7737-5/26
5 Page 
LA8580W
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10. Control output pins (pins 4 and 5)
These output pins are current output pins, and have current capacities of about 30 ±10 µA of source current and over
100 µA of sink current. As a result, pull-down resistors are required if these pins are used to control voltage mode
type input ports such as MOS transistors.
If either of these pins is unused, it must be shorted to ground to assure the source current path.
11. Control input pins (pins 2, 3, 62, 63, and 64)
Since the internal pin circuits include both a pull-down resistor and an input current limiting resistor and furthermore
the high side protection diode has been eliminated, the LA8580W can be directly connected to the controlling
microcontroller even if the supply voltages differ.
However, when directly connected to the microcontroller output ports, the LA8580W substrate is affected, and the
signal-to-noise ratio may be degraded. Thus we recommend inserting series resistors with a value of about 1 kΩ to
2.2 kΩ.
12. Power on reset pin (pin 61)
The power on reset function is enabled by adding a capacitor between pin 61 and ground and a pull-up resistor to
VCC (sample values: 10 µF, 100 kΩ). This allows all the IC mode settings to be set to their default states when power
is first applied. However, to reduce the number of external components, we recommend using serial control of
address 00 to perform a reset at least 200 ms after power is first applied.
However, note that since no serial control operations can be performed if this pin is left at the low level, the external
pull-up resistor is required even if the power on reset function is not used.
Although this pin can be used as an independent reset pin controlled by the microcontroller, an input current limiting
resistor inserted in series is absolutely required for connection with the microcontroller. (This is the only case where
the pull-up resistor is not required, since the current can be supplied by the microcontroller port.)
13. Parallel control mode
The compressor/expander system muting control adopts an independent parallel control technique.
Pin No.
2
3
Pin
CMP-MUTE
EXP-MUTE
Low or open
Compressor system audio: muted
Expander system audio: muted
High
Compressor system audio: normal output
Expander system audio: normal output
14. Data shaper threshold
The built-in data shaper can support either a fixed threshold or threshold following operation depending on the
application circuit at pin 60.
(1) Threshold following: Insert a capacitor between pin 60 and ground (following function internal bias resistor: 50 kΩ).
(2) Fixed threshold: Connect pin 60 to ground.
15. VOX (voice signal level detection) circuit
The VOX circuit consists of an input block amplifier that sets the sensitivity, a full-wave rectifier that rectifies that
signal, and comparator that compares the rectified voltage. The smoothing capacitor for the full-wave rectifier is
connected to pin 56. Since the ripple component increases and an AC component may be output from the VOX
circuit if that capacitor is too small, a capacitor of 0.47 µF or greater must be used.
If the VOX circuit is not used, short pins 54 and 55 together, and connect pins 56 and 57 to ground.
16. ESD protection diode
The ESD protection diodes have been removed from the control pin and data output pin circuits to allow these pins to
be connected directly to the microcontroller. However if the microcontroller input and output ports are connected
directly, the LA8580W substrate may be affected and that can lead to degradation of the signal-to-noise ratio. To
avoid this problem, we recommend the insertion of series resistors with a value of about 1 kΩ to 2.2 kΩ.
Pins with no protection diodes: VCC1 (pin 9), VCC2 (pin 58), GND1 (pin 40), and GND2 (pin 1)
Pins with only low side protection diodes: Pin 2, 3, 4, 5, 57, 59, 61, 62, 63, 64
Pins with only high side protection diodes: All other pins
No. 7737-11/26
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| Páginas | Total 26 Páginas | |
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