參數(shù)資料
型號(hào)： MAX9888EVKIT+
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 107/115頁(yè)
文件大小： 0K
描述： KIT EVALUATION FOR MAX9888
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 1
系列： DirectDrive®, FLEXSOUND™
相關(guān)產(chǎn)品： MAX9888EWY+T-ND - IC CODEC AUDIO FLEXSOUND 63WLP
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Stereo Audio CODEC
with FlexSound Technology
MAX9888
91
Figure 28. Speaker Amplifier Signal Processing Block Diagram
Speaker Amplifier Signal Processing
The IC includes signal processing to improve the sound
quality of the speaker output and protect transducers
from damage. An excursion limiter dynamically adjusts
the highpass corner frequency, while a power limiter and
distortion limiter prevent the amplifier from outputting too
much distortion or power. The excursion limiter is located
in the DSP while the distortion limiter and power limiter
control the analog volume control (Figure 28). All three
limiters analyze the speaker amplifier’s output signal to
determine when to take action.
Excursion Limiter
The excursion limiter is a dynamic highpass filter that
monitors the speaker outputs and increases the high-
pass corner frequency when the speaker amplifier’s out-
put exceeds a predefined threshold. The filter smoothly
transitions between the high and low corner frequency to
prevent unwanted artifacts. The filter can operate in four
different modes:
U
Fixed Frequency Preset Mode. The highpass corner
frequency is fixed at the upper corner frequency and
does not change with signal level.
U
Fixed Frequency Programmable Mode. The high-
pass corner frequency is fixed to that specified by the
programmable biquad filter.
U
Preset Dynamic Mode. The highpass filter automati-
cally slides between a preset upper and lower corner
frequency based on output signal level.
U
User Programmable Dynamic Mode. The highpass
filter slides between a user-programmed biquad filter
on the low side to a predefined corner frequency on
the high side.
The transfer function for the user-programmable biquad is:
-1
-2
0
1
2
-1
-2
1
2
b
b z
H(z)
1 a z
a z
+
=
+
The coefficients b0, b1, b2, a1, and a2 are sample rate
dependent and stored in registers 0xB4 through 0xC7.
Store b0, b1, and b2 as positive numbers. Store a1 and
a2 as negated two’s complement numbers. Separate fil-
ters can be stored for the DAI1 and DAI2 playback paths.
The MAX9888 EV kit software includes a graphic interface
for generating the user-programmable biquad coefficients.
Note: Only change the excursion limiter settings when
the signal path is disabled to prevent undesired artifacts.
DALEN
DACL
DAREN
DACR
SPKLP
SPKLN
MIXSPL
+6dB
SPVOLL:
+8dB TO -62dB
SPKLVDD
SPKLGND
SPKRVDD
SPKRP
SPKRN
SPLEN
SPREN
POWER/
DISTORTION LIMITER
MIXSPR
+6dB
SPVOLR:
+8dB TO -62dB
SPKRPGND
MIX
EQ1EN
EQ2EN
DVEQ1:
0dB TO -15dB
DV1G:
0/6/12/18dB
DV2:
0dB TO -15dB
DCB2
5-BAND
PARAMETRIC
EQ
5-BAND
PARAMETRIC
EQ
DVEQ2:
0dB TO -15dB
MULTIBAND ALC
EXCURSION LIMITER
DV1:
0dB TO -15dB
MODE1
DVFLT
MIXDAR
+
MIX
MIXDAL
MIX
AUDIO/
FILTERS
AUDIO/
VOICE
FILTERS
BATTERY ADC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9888EVKIT+ 功能描述:音頻 IC 開(kāi)發(fā)工具 MAX9888 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評(píng)估:TAS5614L 工作電源電壓:12 V to 38 V
MAX9888EWY+T 功能描述:接口—CODEC Stereo Audio CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
MAX9889EWO+T 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
MAX988ESA 功能描述:校驗(yàn)器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX988ESA+ 功能描述:校驗(yàn)器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
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