参数资料
| 型号： | MAX9856ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 31/46页 |
| 文件大小： | 0K |
| 描述： | IC AUDIO CODEC 40TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 音频编解码器 |
| 数据接口： | 串行 |
| 分辨率（位）： | 18 b |
| ADC / DAC 数量： | 2 / 2 |
| 三角积分调变： | 是 |
| S/N 比，标准 ADC / DAC (db)： | 77 / 91 |
| 动态范围，标准 ADC / DAC (db)： | 85 / 91 |
| 电压 - 电源，模拟： | 1.71 V ~ 3.6 V |
| 电压 - 电源，数字： | 1.71 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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MAX9856
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
______________________________________________________________________________________
37
Headset Detection
The MAX9856 features headset detection that can detect
the insertion and removal of a jack as well as the load
type. When a jack is detected, an interrupt on
IRQ can be
triggered to alert the microcontroller of the event. Figure 6
shows the typical configuration for jack detection and
Table 14 shows the headset detect control register and
bit description.
Sleep-Mode Jack Detection
When the MAX9856 is in shutdown and the power sup-
ply is available, sleep mode jack detection can be
enabled to detect jack insertion. Sleep mode applies a
2A pullup current to JACKSNS and HPL, which forces
the voltage on JACKSNS and HPL to AVDD when no
load is applied. When a jack is inserted, either JACK-
SNS, HPL, or both are loaded sufficiently to reduce the
output voltage to nearly 0V and clear the JKSNS or
LSNS bits, respectively. The change in the LSNS and
JKSNS bits sets JDET and triggers an interrupt on
IRQ
if IJDET is set. The interrupt signals the microcontroller
that a jack has been inserted, allowing the microcon-
troller to respond as desired.
Powered-On Jack Detection
When the MAX9856 is in normal operation and the
microphone interface is enabled, jack insertion and
removal can be detected through the JACKSNS pin. As
shown in Figure 6, VMIC is pulled up by MICBIAS.
When a microphone is connected, VMIC is assumed to
be between 0V and 95% of VMICBIAS. If the jack is
removed, VMIC increases to VMICBIAS. This event caus-
es JKMIC to be set, alerting the system that the head-
set has been removed. Alternatively, if the jack is
inserted, VMIC decreases to below 95% of VMICBIAS
and JKMIC is cleared, alerting that a jack has been
inserted. The JKMIC bit can be configured to create a
hardware interrupt that alerts the microcontroller of jack
removal and insertion events.
Impedance Detection
The MAX9856 is able to detect the type of load con-
nected by applying a 2mA pullup current to HPL, HPR,
and JACKSNS. To minimize click-and-pop the current
is ramped up and down over a 24ms period. The 2mA
current can be individually applied to HPL, HPR, and
JACKSNS by appropriately configuring the EN bits.
When the 2mA current has finished ramping, HSDETL,
HSDETR, and JSDET are updated to reflect the mea-
sured impedance. EN must be cleared and reset to re-
measure the impedance. Figure 7 and Table 15
illustrate the impedance detection process.
Figure 6. Example Jack Configuration for Jack Detection
I
2mA
SET EN BITS TO 1
SET EN BITS TO 0
tO
tf
tO + 24ms
tf - 24ms
IMPEDANCE
DETECTION
COMPLETE
READ HSDETL,
HSDETR,
JSDET
Figure 7. Current on HPL, HPR, or JACKSNS During Impedance Detection
GND
MIC
HPR
HPL
MICBIAS
JACKSNS
HPR
MICL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9856EVKIT+ | 功能描述:音频 IC 开发工具 Evaluation Kit for the MAX9856 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 |
| MAX9856GTL/V+ | 功能描述:接口—CODEC Low-Power Audio CODEC with DirectDrive Headphone Amplifiers 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 |
| MAX9856GTL/V+T | 功能描述:接口—CODEC Low-Power Audio CODEC with DirectDrive Headphone Amplifiers 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 |
| MAX985EBT+T | 功能描述:校验器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX985EBT+TG45 | 功能描述:校验器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
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