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參數(shù)資料
| 型號： | MAX9851EVCMODU |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 編解碼器 |
| 英文描述： | MAX9851評估板/評估系統(tǒng) |
| 中文描述： | PCM CODEC |
| 文件頁數(shù)： | 35/73頁 |
| 文件大?。?/td> | 1357K |
| 代理商： | MAX9851EVCMODU |
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MAX9851/MAX9853
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
40
______________________________________________________________________________________
Power-Off/Sleep Mode
When the analog or digital supplies are removed from
the MAX9851/MAX9853, the headset detect circuit
enters sleep mode (PVDD must remain powered, typical-
ly through a direct connection to the battery).
Alternatively, set SLEEP = 1 (register 0x19, bit B2) to
allow sleep mode to monitor headset insertion and
removal while the MAX9851/MAX9853 are in low-power
shutdown. In this mode, the external headset jack is
monitored for activity, but no attempt is made to detect
the headset configuration. For proper operation, the bat-
tery voltage must be available, through PVDD. A low-cur-
rent bias is supplied to EXTMICBIASL to allow detection
of activity. If this pin is pulled low at any time, a hardware
interrupt is triggered and IRQ is set. IRQ remains assert-
ed until sleep mode is exited or the headset jack is
removed. Any pullup resistor on the open-drain IRQ out-
put will cause a small current to be drawn until the C
can initiate a power-up sequence. Once power is
applied to the MAX9851/MAX9853, or SLEEP is set to 0,
the sleep mode is disabled and normal headset detect
functions can be used.
In sleep mode it is important that the microphone bias
be disabled by setting RBEN to 0, and that no parasitic
diodes load the EXTMICBIASL/R pins. Also note that the
autodetect circuitry will trigger IRQ for approximately
50ms when PVDD is initially applied or when sleep mode
is first enabled. This is a consequence of the weak
pullup current used to sense EXTMICBIASL and the
attached AC-coupling capacitor that must be charged.
Normal Operation
Set ENA to 1 (register 0x19, bit B3) and HSTEST to 01
(register 0x19, bits B1–B0) to enable normal operation.
In this mode EXTMICBIASL, EXTMICBIASR, HPL, and
HPR are probed to determine the loading of each pin.
The detected loading is then reported in the HSDET
bits (status register 0x01 B5-B0). The loading of each
pin is shown in Table 3 along with the reported HSDET
code. The headset configuration that corresponds to
some possible loading states is shown in Table 4.
Headphone detection is done in a two-step process.
Test 1 (HSTEST = 01) is used to determine if stereo
headphones are connected. If a balanced mono head-
phone is connected, this test will be inconclusive. Test
2 (HSTEST = 10) must then be performed to determine
the configuration. See Figure 9 for the typical head-
phone test procedure.
Figure 8. Headset-Detection Circuitry
MAX9851
MAX9853
95%
10%
95%
10%
80%
VINTMICBIAS
AVDD
AGND
SLEEP
MODE
IRQ
CONTROL
IRQ
I2C REGISTER
0x01 B5-B0
EXTMICBIASR
EXTMICR
EXTMICBIASL
EXTMICL
HPL
HPR
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9851EVKIT | 功能描述:音頻 IC 開發(fā)工具 Evaluation Kit/Evaluation System for the MAX9851 RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| MAX9853ETM+ | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp 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 |
| MAX9853ETM+T | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp 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 |
| MAX9853EVCMODU | 功能描述:音頻 IC 開發(fā)工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
| MAX9853EVKIT | 功能描述:音頻 IC 開發(fā)工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 產(chǎn)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 |
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