LA8638V Datasheet, PDF (1/16 Pages) Sanyo Semicon Device – Low-voltage Compander IC for Cordless Telephones

Ordering number : EN5776
Monolithic Linear IC
LA8638V
Low-voltage Compander IC
for Cordless Telephones
Overview
The LA8638V provides dynamic range expansion, noise
suppression for enhancing the quality of audio signals in
cordless telephones and other communications systems.
This single chip provides the functions that make it ideal
for cordless telephones: a compressor with a logarithmic
compression ratio of 1/2, expander with a logarithmic
expansion ratio of 2, splatter filter, microphone amplifier,
BTL amplifier, waveform shaper for the receiving signal,
muting for both receiving and transmitting signals, and
standby operation.
Functions
• Transmitter circuits: compressor, microphone amplifier,
limiter (IDC), muting, output level changes to user-
specified levels, and splatter filter
• Receiver circuits: expander, buffer amplifier for filters,
muting, output level changes to user-specified levels,
and BTL amplifier
• Other circuits: waveform shaper for the receiving signal
and standby operation
speaker with a load of 2 kΩ
• Standby operation that conserves battery power during
intermittent reception by disabling all but the waveform
shaper for the receiving signal
• Built-in splatter filter with user-specified fc
• Low-voltage operation (1.8 V to 5.5 V)
Package Dimensions
unit: mm
3191-SSOP30
[LA8638V]
Features
• Full processing of baseband signals for both receiving
and transmitting signals
• Built-in BTL receiver amplifier for driving a ceramic
SANYO: SSOP30
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum power supply voltage
Maximum power dissipation
Operating temperature
Storage temperature
Symbol
V_CC max
Pd max
Topr
Tstg
Ta ≤ 75°C
Operating Conditions at Ta = 25°C
Parameter
Recommended power supply voltage
Operating power supply voltage range
Symbol
V_CC
V_CCop
Conditions
Conditions
Ratings
Unit
7.0
V
100
mW
–20 to +75
°C
–40 to +125
°C
Ratings
Unit
2.4
V
1.8 to 5.5
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
40398RM (OT) No. 5776-1/16