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Analog Devices SSM2166 Manual de usuario

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a
SSM2166*
Microphone Preamplifier with
Variable Compression and Noise Gating
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
FEATURES
Complete Microphone Conditioner in a 14-Lead 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 (ⴞ1 dB)
Low Cost
APPLICATIONS
Microphone Preamplifier/Processor
Computer Sound Cards
Public Address/Paging Systems
Communication Headsets
Telephone Conferencing
Guitar Sustain Effects Generator
Computerized Voice Recognition
Surveillance Systems
Karaoke and DJ Mixers
20 dB; this gain is in addition to the variable gain in other com-
pression 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 opti-
mized signal levels prior to digitization, thereby eliminating the
need for additional gain or attenuation in the digital domain
that could 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, such as the AD1845 and AD1847.
The device is available in 14-lead SOIC and P-DIP packages,
and guaranteed for operation over the extended industrial tempera-
ture range of –40°C to +85°C. For similar features/performance
in an 8-lead package, please refer to the SSM2165.
INPUT – dBu
–70 0–60 –50 –40 –30 –20 –10
10
OUTPUT – dBu
0
–30
–40
–50
–60
–10
–20
RATIO = 10:1
RATIO = 2:1
RATIO = 1:1
Figure 1. SSM2166 Compression and Gating Characteris-
tics with 10 dB of Fixed Gain (The Gain Adjust Pin Can Be
Used to Vary This Fixed Gain Amount)
REV. A
*Patents pending.
Figure 2. Functional Block Diagram and Typical Speech Application
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 eliminate “popping.” In the 1:1 compression set-
ting the SSM2166 can be programmed with a fixed gain of up to
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 1999
CONTROL
AUDIO
+IN
0.1mF
6
BUF
OUT
53
10mF
*
13
V
OUT
9
NOISE GATE
SET
V+
11
ROTATION
POINT SET
10
8
1
GND
22mF
COMPRESSION
RATIO
SET
25kV
2
2.3kV
14
500kV
17kV
1kV
VCA
R
7
LEVEL
DETECTOR
BUFFER
VCA1kV
VCA
IN
SSM2166
4
10mF
R1 = 10kV
R2 = 10kV
1mF
+
12
POWER
DOWN
AVG
CAP
+
++
*OPTIONAL
V+
VCA GAIN
ADJ
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Indice de contenidos

Pagina 1 - Microphone Preamplifier with

aSSM2166*Microphone Preamplifier withVariable Compression and Noise GatingInformation furnished by Analog Devices is believed to be accurate andreliab

Pagina 2 - SSM2166–SPECIFICATIONS

SSM2166REV. A–10–CX1000pFC10.1mFAUDIO IN(RS > 5kV)7+INSSM2166NOTE: ADDITIONAL CIRCUIT DETAILS OMITTED FOR CLARITY.Figure 21. Circuit Con

Pagina 3 - PIN DESCRIPTION

SSM2166REV. A–11–Figure 23c. Evaluation Board Backside Metallization(Not to Scale)Signal sources are connected to the SSM2166 through a 1/8"phon

Pagina 4

SSM2166REV. A–12–or an audio cable, then the onboard OP113 can be used. Touse the OP113 buffer, insert Jumper J4 into board socket pinslabeled “4” an

Pagina 5

SSM2166REV. A–13–STEP 5. Adjusting the Rotation PointSet the input level to 15 mV, and observe the output on the os-cilloscope. Adjust R3—ROTATION PT

Pagina 6 - The SSM2166 Signal Path

SSM2166REV. A–14–SSM2166 Demo Board Parts ListR1 10k* FeedbackR2 10k InputR3 50k Pot Rotation Point, Adj.R4 1k Rotation Point, FixedR5 0 Comp Ratio, F

Pagina 7 - The Level Detector

SSM2166REV. A–15–OUTLINE DIMENSIONSDimensions shown in inches and (mm).14-Lead Plastic DIP(N-14)141780.795 (20.19)0.725 (18.42)0.280 (7.11)0.240 (6.10

Pagina 8 - Control Circuitry

Parameter Symbol Conditions Min Typ Max UnitsAUDIO SIGNAL PATHVoltage Noise Densityen15:1 Compression 17 nV/√HzNoise 20 kHz Bandwidth, VIN = GND –109

Pagina 9 - (Noise Gate) Threshold

SSM2166REV. A–3–PIN DESCRIPTIONPin # Mnemonic Function1 GND Ground2 GAIN ADJUST VCA Gain Adjust Pin. A resistor from this pin to ground sets the fixed

Pagina 10 - Figure 22. Evaluation Board

SSM2166REV. A–4–0–80–80 0–70 –60 –50 –40 –30 –20 –10–10–40–50–60–70–20–30TA = +25°CV+ = 5VVIN = 300mV rms @ 1kHzRL = 100kVNOISE GATE SETTING 550µV rm

Pagina 11

SSM2166REV. A–5–ROTATION POINT – V rmsRROT PT RESISTOR – kV1.00.10.01045510 354015 20 25 30 50 55TA = +25°CV+ = 5VRL = 100kVCOMPRESSION RATIO = 1:1NOI

Pagina 12

SSM2166REV. A–6–APPLICATIONS INFORMATIONThe SSM2166 is a complete microphone signal conditioningsystem on a single integrated circuit. Designed prima

Pagina 13

SSM2166REV. A–7–AUDIO+INBUFOUT532VOUT9NOISEGATE11ROTATIONPOINTADJUST101GND13VCAR7RMSLEVELDETECTORINPUTBUFFERVCAVCAINSSM2166R2 = 10kV1mFCONTROLCIRCUITR

Pagina 14 - SSM2166 Demo Board Parts List

SSM2166REV. A–8–100%10090100mV1S6dBV66dBV85dBVFigure 15b. RMS Level Detector Performance withCAVG = 22 µFControl CircuitryThe output of the rms level

Pagina 15 - PRINTED IN U.S.A

SSM2166REV. A–9–The gain of the VCA can be reduced below 0 dB by makingRGAIN smaller than 1 kΩ. Switching Pin 2 through 330 Ω or lessto ground will m

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