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參數(shù)資料
| 型號： | MAX9851ETM+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 36/71頁 |
| 文件大小： | 0K |
| 描述： | IC CODEC AUDIO STEREO 48TQFN |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 立體聲音頻 |
| 數(shù)據(jù)接口： | 串行 |
| 分辨率（位）： | 18 b |
| ADC / DAC 數(shù)量： | 2 / 2 |
| 三角積分調(diào)變： | 是 |
| S/N 比，標(biāo)準(zhǔn) ADC / DAC (db)： | 81.5 / 88 |
| 動態(tài)范圍，標(biāo)準(zhǔn) ADC / DAC (db)： | 82 / 87.5 |
| 電壓 - 電源，模擬： | 2.6 V ~ 3.3 V |
| 電壓 - 電源，數(shù)字： | 1.7 V ~ 3.3 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-WFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-TQFN-EP（7x7） |
| 包裝： | 帶卷 (TR) |
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MAX9851/MAX9853
Stereo Audio CODECs with Microphone, DirectDrive
Headphones, Speaker Amplifiers, or Line Outputs
______________________________________________________________________________________
41
Microphone detection is provided by the microphone
bias circuitry. Set RBEN, MICLEN, and MICREN to 1
(register 0x12, bit B1 and register 0x1B, bits B1 and
B0) to enable the microphone bias circuitry. The micro-
phone bias voltage is compared with two thresholds,
95% and 10% of VINTMICBIAS. The thresholds define
three output-impedance states: high, medium, and low.
The high-impedance state occurs when there is no load
on the EXTMICBIAS pins. The medium state occurs
when the load is an electret module or an amplified
microphone biased at midsupply. The low state occurs
when the microphone pin is shorted to AGND by a
hook switch or an accessory logic/identification pin.
Alternatively, hook switches that disconnect the micro-
phone can be detected by looking for the high state.
Headphone detection is accomplished by placing a
small pullup current on HPL and HPR. For proper head-
phone detection, make sure that the headphone ampli-
fiers are disabled. Set HSTEST to 01 (register 0x19, bit
B1 and B0) to enable headphone Test 1 (see Table 5).
The sense bias for the headphone pins attempts to pull
both HPL and HPR up to AVDD with a low current to
avoid creating an audible disturbance on the head-
phones. When a stereo headphone is connected, both
HPR and HPL are pulled low. When no headphone is
connected, or a balanced mono speaker has been
HEADSET CONFIGURATION
HPR
HPL
EXTMICBIASL
EXTMICBIASR
No External Connector
High
3-Pole Connector
Mono HP, Mono Microphone
Low
High
Mid
High
4-Pole Connector
Stereo HP, Mono Microphone
Low
Mid
High
Mono HP, Stereo Microphone
Low
High
Mid
5-Pole Connector
Stereo HP, Stereo Microphone
Low
Mid
Test 2 Only*
No HP
Low
High
X
Mono Balanced HP
Low
X
Mono Balanced HP, Mono Microphone
Low
Mid
High
Mono Balanced HP, Stereo Microphone
Low
Mid
Table 4. Example Headset Configurations
*Test 2 is to be performed after Test 1 finds HPR and HPL High. Test 2 is needed only to determine if a balanced mono speaker is
connected to HPR and HPL.
HSDET
HPR
HPL
EXTMICBIASL
EXTMICBIASR
[11XXXX]
x
Low
x
[01XXXX]
x
Mid
x
[00XXXX]
x
High
x
[XX1XXX]
Low
x
[XX0XXX]
High
x
[XXX1XX]
x
Low
x
[XXX0XX]
x
High
x
[XXXX11]
x
Low
[XXXX01]
x
Mid
[XXXX00]
x
High
Table 3. HSDET Bit Decode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9851EVCMODU | 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 |
| 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 |
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