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參數資料
型號: MAX9888EVKIT+
廠商: Maxim Integrated Products
文件頁數: 109/115頁
文件大小: 0K
描述: KIT EVALUATION FOR MAX9888
產品培訓模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 1
系列: DirectDrive®, FLEXSOUND™
相關產品: MAX9888EWY+T-ND - IC CODEC AUDIO FLEXSOUND 63WLP
Stereo Audio CODEC
with FlexSound Technology
MAX9888
93
Power Limiter
The IC’s power limiter tracks the RMS power delivered to
the loudspeaker and briefly mutes the speaker amplifier
output if the speaker is at risk of sustaining permanent
damage.
Loudspeakers are typically damaged when the voice coil
overheats due to extended operation above the rated
power. During normal operation, heat generated in the
voice coil is transferred to the speaker’s magnet, which
transfers heat to the surrounding air. For the voice coil to
overheat, both the voice coil and the magnet must over-
heat. The result is that a loudspeaker can operate above
its rated power for a significant time before it heats suf-
ficiently to cause damage.
The IC’s power limiter includes user-programmable time
constants and power thresholds to match a wide range
of loudspeakers. Program the power limiter’s threshold to
match the loudspeaker’s rated power handling. This can
be determined through measurement or the loudspeak-
er’s specification. Program time constant 1 to match the
voice coil’s thermal time constant. Program time constant
2 to match the magnet’s thermal time constant. The time
constants can be determined by plotting the voice coil’s
resistance vs. time as power is applied to the speaker.
Table 26. Power Limiter Registers
REGISTER
BIT
NAME
DESCRIPTION
0x42
7
PWRTH
Power Limiter Threshold
If the RMS output power from the speaker amplifiers exceeds this threshold, the out-
put is briefly muted to protect the speaker. The threshold is measured in watts assum-
ing an 8I load. VBAT must correctly reflect the voltage of SPKLVDD/SPKRVDD to
achieve accurate thresholds.
6
VALUE
THRESHOLD
(W)
VALUE
THRESHOLD
(W)
0x0
Power limiter
disabled
0x8
0.27
5
0x1
0.05
0x9
0.35
0x2
0.06
0xA
0.48
0x3
0.09
0xB
0.72
0x4
0.11
0xC
1.00
4
0x5
0.13
0xD
1.43
0x6
0.18
0xE
1.57
0x7
0.22
0xF
1.80
2
PWRK
Power Limiter Weighting Factor
Determines the balance between time constant 1 and 2 to match the dominance of
each time constant in the loudspeaker.
1
VALUE
T1 (%)
T2 (%)
000
50
001
62.5
37.5
010
75
25
011
87.5
12.5
0
100
0
101
12.5
87.5
110
25
75
111
37.5
62.5
REGISTER
BIT
NAME
DESCRIPTION
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相關代理商/技術參數
參數描述
MAX9888EVKIT+ 功能描述:音頻 IC 開發工具 MAX9888 Eval Kit RoHS:否 制造商:Texas Instruments 產品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估: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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
MAX988ESA 功能描述:校驗器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓(最大值):6 mV 電源電流(最大值):1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX988ESA+ 功能描述:校驗器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓(最大值):6 mV 電源電流(最大值):1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
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