SSM2166S Analog Devices Inc, SSM2166S Datasheet - Page 16

• Manufacturer Part Number: SSM2166S
• Description: IC PREAMP AUDIO MONO MIC 14SOIC
• Manufacturer: Analog Devices Inc

Specifications of SSM2166S

• Rohs Status: RoHS non-compliant
• Output Type: 1-Channel (Mono)
• Voltage - Supply: 4.5 V ~ 5.5 V
• Features: Microphone
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Max Output Power X Channels @ Load: -

SSM2166
SETUP SUMMARY
The transfer condition of Figure 2 has been implemented. For
inputs below the 100 μV noise gate threshold, circuit and back-
ground noise is minimized. Above it, the output increases at a
rate of 1 dB for each 2 dB input increase until the 500 mV rotation
point is reached at an input of approximately 15 mV. For higher
inputs that drive the output beyond 500 mV, limiting occurs
and there is little further increase. The SSM2166 processes the
output of the buffer, which in the previous example is 20 dB, or
Table 6. Initial Potentiometer Settings
Function
Gain Adjust (VCA)
Rotation Point
Compression Point
Noise Gate
Table 7. Demonstration Board Parts List
Component
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
C1
C2
C3
C4
C5
C6
C7
IC1
IC2
S1
J1
J2
Value
10 kΩ resistor
10 kΩ resistor
50 kΩ potentiometer
500 Ω resistor
0 Ω resistor
100 kΩ potentiometer
1 MΩ potentiometer
500 Ω resistor
1 kΩ resistor
20 kΩ potentiometer
330 Ω resistor
100 kΩ resistor
0.1 μF capacitor
Potentiometer
R10
R3
R6
R7
0.1 μF capacitor
1 μF capacitor
2.2 μF to 22 μF capacitor
0.01 μF capacitor
10 μF capacitor
10 μF capacitor
SSM2166
OP113, IC
SPST, Switch
1/8-inch mini phone plug jumper
RCA female jumper
Range
0 kΩ to 20 kΩ
0 kΩ to 50 kΩ
0 kΩ to 100 kΩ
0 kΩ to 1 MΩ
Initial Position
CCW
CCW
CCW
CW
Rev. D | Page 16 of 20
10× the input level. Use the oscilloscope to ensure that the
buffer is not being driven into clipping with the highest expected
input peaks. Always take the minimum gain in the buffer consis-
tent with the average source level and crest factor (ratio of peak
to rms). The wide program range of the SSM2166 makes it
useful in many applications other than microphone signal
conditioning.
Description
Feedback
Input
Rotation point, adjust
Rotation point, fixed
Compression ratio, fixed
Compression ratio, adjust
Noise gate, adjust
Noise gate, fixed
Gain adjust, fixed
Gain adjust
Mute
Power-down, pull-up
Input dc block
Buffer low F, G = 1
+V bypass
Average capacitor
Mute click suppress
Coupling
VCA noise/dc balance
MIC preamp
Operational amplifier, output buffer
Mute
MIC input
Output jack
Initial Resistance
0 Ω
0 Ω
0 Ω
1 MΩ
Effect of Change
1:1; CW to increase compression
0 dB; CW to increase VCA gain
1 V; CW to reduce rotation point
300 μV; CCW to increase threshold