LA8519M Datasheet, PDF (21/29 Pages) Sanyo Semicon Device – I/O Switch/Voice Signal-Processing IC for Cordless Telephones

LA8519M
• Speech network internal analog switch operation
T
R
+++
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
49
50
BN1
51
52
BN2
53
54
55
Power supply
21
Line amplifier ^SW2
TRANSMIT
AMP
ATT
12
SW1
2
1
SW3
SW4
21
GAIN CTL
RECEIVER
AMP
–9.5 dB
HAND
CPU
INTERFACE
A13131
Note: Switches SW2 and SW3 are controlled by the MUTE pin (pin 35). Switches SW1 and SW4 are controlled by address 3D as set by serial data
transfers. Note that switches SW2 and SW3 operate together, as do switches SW1 and SW4.
SW1 and SW4 Operation
State
SW1
SW4
Power supplied (initial state)
1
1
Address 3D
2
2
Power off
2
2
Note: When the power is off, SW1 and SW4 go to the "2" positions, and their states cannot be changed.
SW2 and SW3 Operation
Pin 35 (MUTE)
High
Low
SW2
1
2
SW3
1
2
Note: SW2 and SW3 operate as described above regardless of the power supplied/off state.
• Line amplifier attenuator
Normally, the line attenuator is set to 0 dB. It can be set to –6 dB by setting address to 7D and mode to D = 1 with
a serial data transfer.
64
LINE-OUT
ATT
Crosspoint Switch
A13132
• Oscillator amplifier attenuator
Normally, the oscillator amplifier attenuator is set to –16 dB. It can be set to 0 dB by setting address to 7F and
mode to D = 1 with a serial data transfer.
8
OSC-IN
ATT
SW5
A13133
No. 6471-21/29