MAX97236EVKIT+ Maxim Integrated Products, MAX97236EVKIT+ Datasheet - Page 30

• Manufacturer Part Number: MAX97236EVKIT+
• Description: Audio Modules & Development Tools MAX97236 Eval Kit
• Manufacturer: Maxim Integrated Products

Specifications of MAX97236EVKIT+

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Audio Amplifier with Jack Detection
Table 17. Enable Registers (continued)
30
REGISTER
Enable2
0x1E
BIT
5
4
3
2
1
0
NAME
AUTO
VSEN
ZDEN
THRH
FAST
Volume Adjustment Slewing
Volume changes are smoothed by stepping through intermediate steps. VSEN
also ensures that the volume automatically ramps from the minimum setting to
the programmed value at turn-on and back to the minimum value at turn-off.
0 = Enabled.
1 = Disabled.
Zero-Crossing Detection
ZDEN holds volume changes until there is a zero-crossing in the audio signal.
This reduces clicks during volume changes (zipper noise). If no zero-crossing
is detected within 100ms, the volume change is forced.
0 = Enabled.
1 = Disabled.
Jack Insertion Polling Speed
A fast polling speed tests for a jack insertion 3 times per second, while a
slow polling speed tests for jack insertion every 2 seconds. Setting the polling
speed to slow mode saves shutdown power consumption while the mechanical
JACKSW switch is operational.
0 = Slow polling mode, 2s delay between polls.
1 = Fast polling mode, 333ms delay between polls.
Class H Threshold Select
THRH selects the threshold at which the power supplies switch from Q0.9V
to Q1.8V. A higher threshold allows the IC’s output stage to be powered from
Q0.9V for a higher percentage of the audio waveform, decreasing power dis-
sipation at the expense of dynamic distortion.
0 = Low threshold.
1 = High threshold.
Automatic Mode Select
Set AUTO to allow the IC to enable functional blocks depending on the load.
In auto mode, the user merely reads the status of registers 0x1D and 0x1E to
find out what blocks are enabled. Setting AUTO makes bits register 0x1D and
0x01E read-only (except SHDN and SLEEP). Clear AUTO to give the system
control of what functional blocks are active. The user needs to allow the jack
configuration detect algorithm to complete before enabling functional blocks.
00 = User controls which functional blocks are on. Registers 0x1D and 0x1E
are R/W.
01 = The IC enables functional blocks automatically depending on the results
of the jack configuration detect algorithm after SHDN is set.
10 = The IC enables functional blocks automatically depending on the results
of the jack configuration detect algorithm regardless of whether SHDN is set.
SHDN must go to high to enable audio playback.
DESCRIPTION