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| 型號： | SSM2166SZ-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 0K |
| 描述： | IC PREAMP AUDIO MONO MIC 14SOIC |
| 產(chǎn)品變化通告： | Material Change 25/Mar/2009 |
| 標準包裝： | 1 |
| 類型： | AB 類 |
| 輸出類型： | 1-通道（單聲道） |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 特點： | 麥克風 |
| 安裝類型： | 表面貼裝 |
| 供應商設備封裝： | 14-SOICN |
| 封裝/外殼： | 14-SOIC（0.154"，3.90mm 寬） |
| 包裝： | 標準包裝 |
| 產(chǎn)品目錄頁面： | 775 (CN2011-ZH PDF) |
| 其它名稱： | SSM2166SZ-REEL7DKR |
Microphone Preamplifier with
Variable Compression and Noise Gating
Data Sheet
Rev. E
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
1996–2013 Analog Devices, Inc. All rights reserved.
FEATURES
Complete microphone conditioner in a 14-lead SOIC package
Single 5 V operation
Adjustable noise gate threshold
Compression ratio set by external resistor
Automatic limiting feature—prevents ADC overload
Adjustable release time
Low noise and distortion
Power-down feature
20 kHz bandwidth (±1 dB)
APPLICATIONS
Microphone preamplifiers/processors
Computer sound cards
Public address/paging systems
Communication headsets
Telephone conferencing
Guitar sustain effects generators
Computerized voice recognition
Surveillance systems
Karaoke and DJ mixers
GENERAL DESCRIPTION
The SSM2166 integrates a complete and flexible solution for
conditioning microphone inputs in computer audio systems. It
is also excellent for improving vocal clarity in communications
and public address systems. A low noise, voltage-controlled
amplifier (VCA) provides a gain that is dynamically adjusted by
a control loop to maintain a set compression characteristic. The
compression ratio is set by a single resistor and can be varied
from 1:1 to over 15:1 relative to a user-defined rotation point;
signals above the rotation point are limited to prevent overload
and to eliminate popping. In the 1:1 compression setting, the
SSM2166 can be programmed with a fixed gain of up to 20 dB;
this gain is in addition to the variable gain in other compression
settings. The input buffer can also be configured for front-end
gains of 0 dB to 20 dB. A downward expander (noise gate) prevents
amplification of noise or hum. This results in optimized signal
levels prior to digitization, thereby eliminating the need for
additional gain or attenuation in the digital domain that may
add noise or impair accuracy of speech recognition algorithms.
The compression ratio and time constants are set externally. A
high degree of flexibility is provided by the VCA gain, rotation
point, and noise gate adjustment pins.
The SSM2166 is an ideal companion product for audio codecs
used in computer systems. The SSM2166 is available in a 14-
lead SOIC package and is guaranteed for operation over the
extended industrial temperature range of 40°C to +85°C.
10
0
–10
–20
–30
–40
–50
–60
–70
–60
–50
–40
–30
–20
–10
0
INPUT (dBu)
O
UT
P
UT
(
d
Bu
)
003
57
-00
2
COMP RATIO = 10:1
COMP RATIO = 2:1
COMP RATIO = 1:1
Figure 1. Compression and Gating Characteristics with 10 dB of Fixed Gain (The
Gain Adjust Pin Can Be Used to Vary This Fixed Gain Amount)
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL SPEECH APPLICATION
BUFFER
1k
BUF OUT
VCAIN
VCAR
V+
4
3
5
14
LEVEL
DETECTOR
VCA
CONTROL
8
1
12
6
7
2
13
9
11
10
SSM2166
POWER DOWN
GND
AVG CAP
COMP RATIO SET
GAIN
ADJUST
OUTPUT
NOISE GATE
SET
ROTATION
SET
–IN
AUDIO
+IN
0.1F
R2
10k
1F
+
R1
10k
10F
10F (OPTIONAL)
++
+
25k
22F
500k
2.3k
17k
V+
0
035
7-
0
01
Figure 2.
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