Analog Devices SSM2166 - Manuals

Page 2 - Hz; NOTES; GATE

Parameter Symbol Conditions Min Typ Max Units AUDIO SIGNAL PATH Voltage Noise Density e n 15:1 Compression 17 nV/ √ Hz Noise 20 kHz Bandwidth, V IN = GND –109 dBu 1 Total Harmonic Distortion THD+N 2nd and 3rd Harmonics, V IN = –20 dBu 0.25 0.5 % 22 kHz Low-Pass Filter Input Impedance Z IN 180 k Ω Ou...

Page 3 - PIN CONFIGURATION

SSM2166 REV. A –3– PIN DESCRIPTION Pin # Mnemonic Function 1 GND Ground 2 GAIN ADJUST VCA Gain Adjust Pin. A resistor from this pin to ground sets the fixed gain of the VCA. Tocheck the setting of this pin the compression pin (Pin 10) should be grounded for no com-pression. The gain can be varied fr...

Page 4 - Figure 3. Output vs. Input Characteristics

SSM2166 REV. A –4– 0 –80 –80 0 –70 –60 –50 –40 –30 –20 –10 –10 –40 –50 –60 –70 –20 –30 T A = +25 ° C V+ = 5VV IN = 300mV rms @ 1kHz R L = 100k V NOISE GATE SETTING 550µV rmsROTATION POINT 300mV rmsGAIN ADJUST (PIN 2) = 1.25k V COMP RATIO = 1:1 COMP RATIO = 2:1 COMP RATIO = 5:1 COMP RATIO = 10:1 COMP...

Page 5 - Figure 10a. Wideband Output Noise; Figure 11. Small Signal Transient Response; Figure 12. Large Signal Transient Response

SSM2166 REV. A –5– ROTATION POINT – V rms R ROT PT RESISTOR – k V 1.0 0.1 0.01 0 45 5 10 35 40 15 20 25 30 50 55 T A = +25°C V+ = 5V R L = 100k V COMPRESSION RATIO = 1:1 NOISE GATE SETTING 550 m V rms GAIN ADJUST (PIN 2) = 1.25k V 60 65 70 75 80 85 90 Figure 9. Rotation Point vs. R ROT PT (Pin 11 to...

Page 7 - Figure 14. Functional Block Diagram and Typical Application; The Level Detector

SSM2166 REV. A –7– AUDIO +IN BUF OUT 5 3 2 V OUT 9 NOISE GATE 11 ROTATION POINT ADJUST 10 1 GND 13 VCA R 7 RMS LEVEL DETECTOR INPUT BUFFER VCA VCA IN SSM2166 R2 = 10k V 1 m F CONTROL CIRCUITRY 12 POWER DOWN POWERDOWN R GAIN COMPRESSIONRATIO SET R COMP 8 C AVG 2.2 m F AVGCAP GAIN ADJUST OUTPUT 1k V 4...

Page 8 - Control Circuitry; Compression Ratio; Figure 16. Effect of Varying the Compression Ratio; Rotation Point; Figure 17. Effect of Varying the Rotation Point; VCA Gain Setting and Muting; Figure 18. Effect of Varying the VCA Gain Setting

SSM2166 REV. A –8– 10 0% 100 90 100mV 1S 6dBV 66dBV 85dBV Figure 15b. RMS Level Detector Performance withC AVG = 22 µ F Control Circuitry The output of the rms level detector is a signal proportional tothe log of the true rms value of the buffer output with an addeddc offset. The control circuitry s...

Page 9 - Figure 19. Details of SSM2166 Mute Option; Downward Expansion Threshold; PC Board Layout Considerations

SSM2166 REV. A –9– The gain of the VCA can be reduced below 0 dB by makingR GAIN smaller than 1 k Ω . Switching Pin 2 through 330 Ω or less to ground will mute the output. Either a switch connected toground or a transistor may be used, as shown in Figure 19. Toavoid audible “clicks” when using this ...

Page 10 - and VCA; . This connection makes; Figure 22. Evaluation Board

SSM2166 REV. A –10– C X 1000pF C1 0.1 m F AUDIO IN (R S > 5k V ) 7 +IN SSM2166 NOTE: ADDITIONAL CIRCUIT DETAILS OMITTED FOR CLARITY. Figure 21. Circuit Configuration for Use with HighImpedance Signal Sources The value of the C7 should be the same as C6, the capacitorvalue used between BUF OUT and...

Page 11 - loads, and is externally available

SSM2166 REV. A –11– Figure 23c. Evaluation Board Backside Metallization(Not to Scale) Signal sources are connected to the SSM2166 through a 1/8"phone jack where a 0.1 µ F capacitor couples the input signal to the SSM2166’s +IN pin (Pin 7). As shown in Figure 22 and inmicrophone applications, the...

Page 12 - log; Figure 24. Objective Specifications; Figure 25. Transfer Characteristic; V to 50 mV is a suitable signal source.; Figure 26. Test Equipment Setup; . You have set the buffer; Figure 27. Initial Potentiometer Settings

SSM2166 REV. 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” and “5” and insert Jumper J5 into board socket pinslabeled “6” and “7.” If the output buffer is not required, re-move Jumper J5 and insert Jumper J4 i...

Page 14 - SSM2166 Demo Board Parts List; Figure 28. Evaluation Board Parts List

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...

Page 15 - OUTLINE DIMENSIONS

SSM2166 REV. A –15– OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 14-Lead Plastic DIP (N-14) 14 1 7 8 0.795 (20.19) 0.725 (18.42) 0.280 (7.11)0.240 (6.10) PIN 1 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) SEATINGPLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1...