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参数资料
| 型号： | MAX9851EVCMODU |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 编解码器 |
| 英文描述： | MAX9851评估板/评估系统 |
| 中文描述： | PCM CODEC |
| 文件页数： | 35/73页 |
| 文件大小： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9851EVKIT | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9851 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压: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 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| MAX9853ETM+T | 功能描述:接口—CODEC Stereo Audio CODEC w/DirectDrive Amp RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| MAX9853EVCMODU | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| MAX9853EVKIT | 功能描述:音频 IC 开发工具 Evaluation Kit/Evaluation System for the MAX9853 RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
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