CMX649 CML Microcircuits, CMX649 Datasheet - Page 20

• Manufacturer Part Number: CMX649
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
POWER CONTROL 2 Register ($65)
MIC AMP
Power Control
(Bits 7 – 6)
AUDIO DCA
Power Control
(Bits 5 – 4)
VOLUME DCA
Power Control
(Bits 3 – 2)
XTAL Power
Save
(Bit 1)
ANALOG Enable
(Bit 0)
2003 CML Microsystems Plc
Bit 7
Bit 5
Bit 3
0
0
1
1
0
0
1
1
0
0
1
1
These bits are dedicated to power/current control for the Microphone Amplifier.
These bits are dedicated to power/current control for the Audio Input Digitally
Controlled Amplfier.
These bits are dedicated to power/current control for the Volume Digitally Controlled
Amplifier.
When this bit is a logic 1 the one-pin crystal oscillator circuit is powered down.
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.
Bit 6
Bit 4
Bit 2
0
1
0
1
0
1
0
1
0
1
0
1
Power down (Off).
Lowest power (for audio bandwidths less than 3.3kHz).
Low power (for bit rates between 3.3kHz and 10kHz).
Normal operation (for audio bandwidths greater than
10kHz).
Power down (Off).
Lowest power (for audio bandwidths less than 3.3kHz).
Low power (for audio bandwidths between 3.3kHz and
10kHz).
Normal operation (for audio bandwidths greater than
10kHz).
Power down (Off).
Lowest power (for bit rates less than 32kbps).
Low power (for bit rates between 32kbps and 64kbps).
Normal operation (for bit rates greater than 64kbps).
Power Level Setting
Power Level Setting
Power Level Setting
20
CMX649
D/649/2