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| 型号： | MAX9860EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/38页 |
| 文件大小： | 0K |
| 描述： | KIT EVALUATION FOR MAX9860 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | * |
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MAX9860
16-Bit Mono Audio Voice Codec
30
Maxim Integrated
Automatic Gain Control (AGC)
and Noise Gate
The MAX9860 includes AGC on both microphone
inputs. AGC is enabled by setting the hold time through
AGCHLD. AGC dynamically controls the analog PGA
microphone input gain to hold the level constant over a
20dB input range, enhancing the voice path operation
for various use conditions. When AGC is enabled, it
monitors the signal level at the output of the ADC and
then makes gain adjustments by controlling the analog
microphone PGA. When AGC is enabled, PGAM is not
user programmable.
Since AGC increases the level of all signals below a
user-defined threshold, the noise floor effectively is
increased by 20dB. To counteract this, a noise gate is
included to reduce the gain at low levels. Unlike typical
noise gates that completely silence the output below a
threshold, the noise gate in the MAX9860 reduces the
gain for signals below the defined level. As the signal
level becomes further below the threshold, the gain is
further reduced. The Automatic Gain Control
Thresholds and Noise Gate Thresholds graphs in the
Typical Operating Characteristics show the resulting
steady-state transfer curves when AGC and the noise
gate are enabled.
Table 10. AGC and Noise Gate Registers
REGISTER ADDRESS
B7
B6
B5
B4
B3
B2
B1
B0
0x0E
AGCSRC
AGCRLS
AGCATK
AGCHLD
0x0F
ANTH
AGCTH
BITS
FUNCTION
AGCSRC
AGC/Noise Gate Signal Source Select
0 = The left ADC output is used by the AGC and noise gate.
1 = The sum of the left and right ADC outputs is used by the AGC and noise gate.
AGC Release Time
Time taken by the AGC circuit to increase the gain from minimum to maximum.
CODE
TIME
000
78ms
001
156ms
010
312ms
011
625ms
100
1.25s
101
2.5s
110
5s
AGCRLS
111
10s
AGC Attack Time
The time constant of the AGC gain reduction curve.
CODE
TIME (ms)
00
3
01
12
10
50
AGCATK
11
200
AGC Hold Time
Time the AGC circuit waits before beginning to increase gain when a signal below the threshold is
detected.
CODE
TIME (ms)
00
AGC disabled
01
50
10
100
AGCHLD
11
400
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX9860EVKIT+ | 功能描述:音频 IC 开发工具 MAX9860 Eval Kit 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 |
| MAX9867ETJ+ | 功能描述:接口—CODEC Stereo Audio CODEC for Portable Devices 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 |
| MAX9867ETJ+T | 功能描述:接口—CODEC Stereo Audio CODEC for Portable Devices 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 |
| MAX9867EVKIT+ | 功能描述:音频 IC 开发工具 MAX9867 Eval Kit 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 |
| MAX9867EWV+ | 制造商:Maxim Integrated Products 功能描述:LOW-POWER, STEREO AUDIO CODEC - Rail/Tube |
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