MAX98090AETL+ Maxim Integrated, MAX98090AETL+ Datasheet - Page 120

• Manufacturer Part Number: MAX98090AETL+
• Description: Interface - CODECs 5V 130mW Stereo Headphone Amp
• Manufacturer: Maxim Integrated

Specifications of MAX98090AETL+

• Rohs: yes

MAX98090
Playback Path Dynamic Range Control
The playback path includes a dynamic range control
(DRC) section (Figure 25). The DRC is highly configu-
rable and features digital make-up gain, a dynamic range
compression and expansion, and programmable attack
and release times.
The device dynamic range is determined by the difference
between the full-scale and the RMS noise floor amplitude
of the configured signal path. To avoid performance limit-
ing, the application dynamic range is typically smaller
than the dynamic range of the selected signal path. With
dynamic range control disabled, the input dynamic range
is equal to the output dynamic range (Figure 26). When
Figure 26. Dynamic Range Compression and Expansion
Figure 27. DRC Enable and Make-Up Gain
www.maximintegrated.com
-100
-120
-140
-100
-120
-20
-40
-60
-80
-20
-40
-60
-80
0
0
-140 -120 -100
-120 -100
FULL SCALE
NOISE FLOOR
FULL SCALE
APPLICATIN OUTPUT
DYNAMIC RANGE
INPUT AMPLITUDE (dBFS)
INPUT AMPLITUDE (dBFS)
-80
DRC DISABLED
DRC DISABLED
-80
APPLICATION INPUT
-60
DYNAMIC RANGE
-60
-40
-40
-20
-20
0
0
-100
-120
-100
-120
-140
-20
-40
-60
-80
-20
-40
-60
-80
0
0
THRESHOLD = -60dB
-140 -120 -100
-120 -100
FULL SCALE
NOISE FLOOR
FULL SCALE
EXPANSION
RATIO = 1:2
COMPRESSED OUTPUT
DYNAMIC RANGE
DYNAMIC RANGE COMPRESSION
INPUT AMPLITUDE (dBFS)
INPUT AMPLITUDE (dBFS)
THRESHOLD = -30dB
-80
DRC ENABLED
COMPRESSION
-80
THRESHOLD = -30dB
RATIO = 4:1
APPLICATION INPUT
-60
DYNAMIC RANGE
compression is enabled, if the input signal amplitude
exceeds the compression threshold the gain is reduced
by the chosen compression ratio. This results in a smaller,
compressed output dynamic range relative to the input
dynamic range. When expansion is enabled, the gain is
decreased by the chosen expansion ratio if the input sig-
nal amplitude instead falls below the expansion threshold.
This results in a larger, expanded output dynamic range.
The DRC also features a digital make-up gain control
section (Table 54), that can be programmed from 0dB to
12dB in 1dB increments. Figure 27 shows the effect of
enabling the DRC with and without digital make-up gain.
COMPRESSION
-60
RATIO = 2:1
Ultra-Low Power Stereo Audio Codec
-40
-40
-20
-20
0
0
-100
-120
-140
-100
-120
-20
-40
-60
-80
-20
-40
-60
-80
0
0
-140 -120 -100 -80
-120 -100
FULL SCALE
NOISE FLOOR
FULL SCALE
EXPANDED OUTPUT
DYNAMIC RANGE
A
V_ALC
DYNAMIC RANGE EXPANSION
DRC ENABLED WITH GAIN
INPUT AMPLITUDE (dBFS)
INPUT AMPLITUDE (dBFS)
= +10dB
-80
Maxim Integrated │ 120
APPLICATION INPUT
-60
DYNAMIC RANGE
-60dB, RATIO = 1:2
THRESHOLD =
-60
EXPANSION
-40
-40
-20
-20
0
0