CMX649 Просмотр технического описания (PDF) - CML Microsystems Plc
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CMX649 Datasheet PDF : 50 Pages
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ADM Codec
CMX649
POWER CONTROL 2 Register ($65)
MIC AMP
These bits are dedicated to power/current control for the Microphone Amplifier.
Power Control
(Bits 7 – 6)
Bit 7 Bit 6
Power Level Setting
0
0 Power down (Off).
0
1 Lowest power (for audio bandwidths less than 3.3kHz).
1
0 Low power (for bit rates between 3.3kHz and 10kHz).
1
1 Normal operation (for audio bandwidths greater than
10kHz).
AUDIO DCA
These bits are dedicated to power/current control for the Audio Input Digitally
Power Control Controlled Amplfier.
(Bits 5 – 4)
Bit 5 Bit 4
Power Level Setting
0
0 Power down (Off).
0
1 Lowest power (for audio bandwidths less than 3.3kHz).
1
0 Low power (for audio bandwidths between 3.3kHz and
10kHz).
1
1 Normal operation (for audio bandwidths greater than
10kHz).
VOLUME DCA These bits are dedicated to power/current control for the Volume Digitally Controlled
Power Control Amplifier.
(Bits 3 – 2)
Bit 3 Bit 2
Power Level Setting
0
0 Power down (Off).
0
1 Lowest power (for bit rates less than 32kbps).
1
0 Low power (for bit rates between 32kbps and 64kbps).
1
1 Normal operation (for bit rates greater than 64kbps).
XTAL Power
Save
(Bit 1)
When this bit is a logic 1 the one-pin crystal oscillator circuit is powered down.
ANALOG Enable
(Bit 0)
When this bit is set to a logic 1 all of the analog circuitry (register $64 and bits 7-2 of
register $65) is enabled. When this bit is set to a logic 0 all of the analog circuitry is
powered down (on-chip bandgap reference is powered down). This is equivalent to
setting all of the bits of register $64 and bits 7-2 of register $65 to a logic 0. So to
enable the AAF pabk, register $64 bit 6 and register $65 bit 0 must both be set to
logic 1. Note that these bits control power to their respective blocks and that a signal
path may still exist even if the block is power send.
© 2003 CML Microsystems Plc
20
D/649/2
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