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Analog Devices SSM2166 Series, Руководство пользователя

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Analog Devices SSM2166 Series Скачать руководство пользователя страница 14

SSM2166

REV. A

–14–

SSM2166 Demo Board Parts List

R1

10k*

Feedback

R2

10k

Input

R3

50k Pot

Rotation Point, Adj.

R4

1k

Rotation Point, Fixed

R5

0

Comp Ratio, Fixed

R6

100k Pot

Comp Ratio, Adj.

R7

1M Pot

Noise Gate, Adj.

R8

1k

Noise Gate, Fixed

R9

1k

Gain Adj., Fixed

R10

20k Pot

Gain Adj.

R11

330

Mute

R12

100k

Power Down Pull-Up

C1

0.1*

Input DC Block

C2

1

Buffer Low f g = 1

C3

0.1 

µ

F

+V Bypass

C4

2.2–22

Avg. Cap

C5

0.01

Mute Click Suppress

C6

10

Coupling

C7

10

VCA Noise/DC Balance

IC1

SSM2166P

Mic Preamp

IC2

OP113FP

Op Amp, Output Buffer

S1

SPST

Mute

J1

1/8" Mini Phone Plug

MIC Input

J2

RCA Female

Output Jack

*Note:  R values in k

Ω

, C values in 

µ

F.

Figure 28. Evaluation Board Parts List

Содержание SSM2166 Series

Страница 1: ...SM2166 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...

Страница 2: ...in 12 0 V Specifications subject to change without notice REV A 2 CAUTION ESD electrostatic discharge sensitive device Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection Although the SSM2166 features proprietary ESD protection circuitry permanent damage may occur on devices subjected to high energy electrostatic disch...

Страница 3: ...signal should be ac coupled 0 1 µF typical into this pin 8 AVG CAP Detector Averaging Capacitor A capacitor 2 2 µF 22 µF to ground from this pin is the averaging capacitor for the detector circuit 9 NOISE GATE SET Noise Gate Threshold Set Point A resistor to V sets the level below which input signals are downward expanded For a 0 7 mV threshold the resistor value is approximately 380 kΩ Increasing...

Страница 4: ...2 5 12 5 12 5 96 96 96 215 215 215 395 395 395 RCOMP kV TYPICAL Figure 5 Compression Ratio vs RCOMP Pin 10 to GND GAIN dB GAIN ADJUST RESISTOR kV 20 6 0 0 26 2 4 6 8 10 12 14 16 18 20 22 24 18 8 4 2 14 10 16 12 28 30 TA 25 C V 5V RL 100kV VIN 100mV rms 1kHz NOISE GATE SETTING 550mV rms ROTATION POINT PIN 11 1V rms COMPRESSION RATIO 1 1 Figure 6 VCA Gain vs RGAIN Pin 2 to GND INPUT VOLTAGE V rms TH...

Страница 5: ... dB 70 60 20 1k 1M 10k 100k 50 40 0 30 20 10 10 ROTATION POINT 1 13V rms NOISE GATE SETTING 336mV rms RCOMP 40kV VIN 400mV rms G 60dB G 40dB G 20dB Figure 10b GBW Curves vs VCA Gain FREQUENCY Hz 10 80 20 30k 100 1k 20 30 40 50 60 70 RCOMP 0 RGAIN 1 24kV RGATE 500kV RROT 1 74kV 10k V 5 1V p p V 5 0 5V p p PSRR dB Figure 10c PSRR vs Frequency 10 0 100 90 20mV 10ms TA 25 C CAVG 2 2mF SYSTEM GAIN 0dB ...

Страница 6: ...e in the input signal level causes approximately a 3 dB change in the output level As a result the gain of the system is small for very small input signal levels even though it may be quite large for small input signals above of VDE The downward expansion threshold VDE is set externally by the user via RGATE at Pin 9 NOISE GATE Finally the SSM2166 provides an active HIGH CMOS compatible digital in...

Страница 7: ...large a value can result in slow response times to signal dy namics Electrolytic capacitors are recommended here for low est cost and should be in the range of 2 µF to 47 µF Capacitor values from 18 µF to 22 µF have been found to be more appro priate in voiceband applications where capacitors on the low end of the range seem more appropriate for music program material The rms detector filter time ...

Страница 8: ... internal dc reference voltage in the control circuitry used to set the rotation point is user specified as il lustrated in Figure 9 The effect on rotation point is shown in Figure 17 By varying a resistor RROT PT connected between the positive supply and the ROTATION POINT SET pin Pin 11 the rotation point may be varied from approximately 20 mV rms to 1 V rms From the figure the rotation point is...

Страница 9: ...he power supply to the SSM2166 can result in quicker settling times the off to on settling time of the SSM2166 is less than 200 ms while the on to off settling time is less than 1 ms In either implementation transients may appear at the output of the de vice In order to avoid these output transients MUTE control of the VCA s gain as previously mentioned should be used PC Board Layout Consideration...

Страница 10: ...diagram of the SSM2166 evaluation board avail able upon request from Analog Devices is illustrated in Figure 22 As a design aid the layouts for the topside silkscreen topside and backside metallization layers are shown in Figures 23a b and c Although not shown to scale the finished dimen sion of the evaluation board is 3 5 inches by 3 5 inches and comes complete with pin sockets and a sample of th...

Страница 11: ...ER DOWN input to ground for normal opera tion Jumper J3 can be replaced by an open drain logic buffer for a digitally controlled shutdown function An output signal MUTE function can be implemented on the SSM2166 by con necting the GAIN ADJUST pin Pin 2 through a 330 Ω resis tance to ground This is provided on the evaluation board via R11 and S1 A capacitor C5 connected between Pin 2 and ground and...

Страница 12: ...40 0 1 10 1 0 OUTPUT mV 15 ROTATION POINT COMPRESSION REGION 1 2 LIMITING REGION GATE THRESHOLD Figure 25 Transfer Characteristic Evaluation Board If you build your own breadboard keep the leads to Pins 3 4 and 5 short A convenient evaluation board is available from your sales representative The R and C designations refer to the demonstration board schematic of Figure 22 and parts list Figure 28 T...

Страница 13: ...arying the averaging capacitor C4 changes the attack and decay times which are best determined empirically Compression ratio will keep the output steady over a range of microphone to speaker distance and the noise gate will keep the background sounds subdued STEP 9 Record Values With the power removed from the test fixture measure and record the values of all potentiometers including any fixed res...

Страница 14: ... 1k Gain Adj Fixed R10 20k Pot Gain Adj R11 330 Mute R12 100k Power Down Pull Up C1 0 1 Input DC Block C2 1 Buffer Low f g 1 C3 0 1 µF V Bypass C4 2 2 22 Avg Cap C5 0 01 Mute Click Suppress C6 10 Coupling C7 10 VCA Noise DC Balance IC1 SSM2166P Mic Preamp IC2 OP113FP Op Amp Output Buffer S1 SPST Mute J1 1 8 Mini Phone Plug MIC Input J2 RCA Female Output Jack Note R values in kΩ C values in µF Figu...

Страница 15: ... 014 0 356 0 060 1 52 0 015 0 38 0 210 5 33 MAX 0 130 3 30 MIN 0 070 1 77 0 045 1 15 0 100 2 54 BSC 0 160 4 06 0 115 2 93 14 Lead Narrow Body SOIC SO 14 14 8 7 1 0 3444 8 75 0 3367 8 55 0 2440 6 20 0 2284 5 80 0 1574 4 00 0 1497 3 80 PIN 1 SEATING PLANE 0 0098 0 25 0 0040 0 10 0 0192 0 49 0 0138 0 35 0 0688 1 75 0 0532 1 35 0 0500 1 27 BSC 0 0099 0 25 0 0075 0 19 0 0500 1 27 0 0160 0 41 8 0 0 0196...

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