ACS422A68TAGZBX8 IDT, ACS422A68TAGZBX8 Datasheet - Page 35

• Manufacturer Part Number: ACS422A68TAGZBX8
• Description: Interface - CODECs
• Manufacturer: IDT

Specifications of ACS422A68TAGZBX8

• Rohs: yes
• Part # Aliases: IDTACS422A68TAGZBX8

ACS422x68
LOW-POWER, HIGH-FIDELITY, INTEGRATED CODEC
©2011 INTEGRATED DEVICE TECHNOLOGY, INC.
The LSPKOut (L+, L-) and RSPKOut (R+, R-) pins are controlled similarly, but independently of, the headphone output
pins. They are intended to drive an 8 ohm or 4 ohm speaker pair.
R2 (2h)
SPKVOLL
R3 (3h)
SPKVOLR
Register Address
3.14.2. Speaker Outputs
3.14.3.
3.14.2.1. Speaker Volume Control Registers
DDX
For additional information on the DDX
www.idt.com.
The DDX
•
•
•
The power stages boost the signals to higher levels, sufficient to drive speakers at a comfortable lis-
tening level.
3.14.3.1. Constant Output Power Mode
In normal operation the BTL amplifier is rated at 0.5W (full scale digital with 6dB BTL gain) into an 8
ohm load at 3.6V but will vary from about 0.38W to about 1.2W across a 3.1V to 5.5V supply range.
However, when constant output power mode is enabled, the full scale output is held constant from
3.1V to 5.5V.
Feedback filters are applied to shape any noise. The filters move noise from audible frequencies
to frequencies above the audio range.
The PWM block converts the data streams to tri-state PWM signals and sends them to the
power stages.
Finally, the Class-D controller block adjusts the output volume to provide constant output power
across supply voltage.
6:0
6:0
Bit
TM
7
7
Class D Audio Processing
TM
SPKVOL_R
Class D PWM Controller performs the following signal processing:
SPKVOL_L
RSVD
RSVD
Label
[6:0]
[6:0]
Table 38. SPKVOL L/R Registers
Type
RW
RW
R
R
1101111
1101111
Default
(0dB)
(0dB)
35
0
0
TM
Class D solution, please see the application note on
Reserved
Left Speaker Volume
1111111 = +12dB
1111110 = +11.25dB
…
1101111 = 0dB
...
0001000 to 0000001 = -77.25dB
0000000= Mute
Note: If SPKVOLU is set, this setting will take effect
after the next write to the Right Input Volume register.
Reserved
Right Speaker Volume
1111111 = +12dB
1111110 = +11.25dB
…
1101111 = 0dB
...
0001000 to 0000001 = -77.25dB
0000000 = Mute
Description
ACS422X68
V1.6 01/13