参数资料
型号: MAX9856ETL+T
厂商: Maxim Integrated Products
文件页数: 21/46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:
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)
MAX9856
Automatic Gain Control
The MAX9856 AGC continuously adjusts the analog
microphone PGAs to maintain constant signal level. When
the AGC is enabled, manual control of the input PGA is
not possible. The PGA includes zero-cross detection,
which prevents gain changes, from being audible.
The AGC process consists of three main sections.
When the AGC threshold is exceeded, the gain is
reduced exponentially with a time constant referred to
as the attack time. Once the large signal has passed,
the AGC waits the specified hold time before reducing
the gain. The time required to reduce the gain from
maximum attenuation to minimum attenuation is known
as the release time.
The AGC circuitry only operates on the PGA in the micro-
phone path, but the digital level detector is based on the
mixed signal. Only use the AGC when input signals from
the LINEIN and AUXIN are excluded or attenuated.
Table 10 lists the AGC registers and shows the AGC
register bit description.
Low-Power Audio CODEC with
DirectDrive Headphone Amplifiers
28
______________________________________________________________________________________
ADCHP/DACHP
LRCLK (kHz)
000
001 (Hz)
010 (Hz)
011 (Hz)
100 (Hz)
101 (Hz)
110 (Hz)
111 (Hz)
8
Off
5
10
20
41
82
170
364
11.025
Off
7
14
28
56
114
235
501
12
Off
8
15
30
61
124
255
545
16
Off
10
20
40
81
165
340
727
22.05
Off
14
28
55
112
227
469
1002
24
Off
15
30
60
122
247
511
1091
32
Off
20
40
80
162
330
681
1455
44.1
Off
28
55
111
224
455
938
2005
48
Off
30
60
121
244
495
1021
2182
64
Off
40
80
161
325
660
1362
2909
88
Off
55
111
222
448
909
1877
4009
96
Off
60
120
241
487
990
2043
4364
Table 9. Digital Highpass Filter Cutoff Frequencies
REG
B7
B6
B5
B4
B3
B2
B1
B0
0x0C
0
AGCRLS
AGCATK
AGCHLD
0x0D
0
AGCSRC
AGCSTH
Table 10. Automatic Gain Control Registers
BITS
FUNCTION
AGCRLS
AGC Release Time. The release time is the time it takes for the gain to return to its normal level after the
input signal has fallen below the threshold and the hold time has passed:
000—78ms
001—156ms
010—312ms (recommended)
011—625ms
100—1.25s
101—2.5s
110—5s
111—10s
AGC Register Bit Description
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