SSM2166_15 datasheet(3/20 Pages) AD

Part #	SSM2166

Description	Microphone Preamplifier with Variable Compression and Noise Gating

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Data Sheet

SSM2166

Rev. E | Page 3 of 20

SPECIFICATIONS

V+ = 5 V, f = 1 kHz, RL = 100 kΩ, RGATE = 600 kΩ, RROT PT = 3 kΩ, RCOMP = 0 Ω, R1 = 0 Ω, R2 = ∞ Ω, TA = 25°C, unless otherwise noted;

VIN = 300 mV rms.

Table 1.

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

AUDIO SIGNAL PATH

Voltage Noise Density

en

15:1 Compression

17

nV/√Hz

Noise

20 kHz bandwidth, VIN = GND

−109

dBu1

Total Harmonic Distortion and

Noise

THD + N

Second and third harmonics, VIN = −20 dBu,

22 kHz low-pass filter

0.25

0.5

%

Input Impedance

ZIN

180

kΩ

Output Impedance

ZOUT

75

Ω

Load Drive

Resistive

5

kΩ

Capacitive

2

nF

Buffer

Input Voltage Range

1% THD

1

V rms

Output Voltage Range

1% THD

1

V rms

VCA

Input Voltage Range

1% THD

1

V rms

Output Voltage Range

1% THD

1.4

V rms

Gain Bandwidth Product

1:1 compression, VCA gain = 60 dB

30

MHz

CONTROL SECTION

VCA Dynamic Gain Range

60

dB

VCA Fixed Gain Range

−60 to +19

dB

Compression Ratio, Minimum

1:1

Compression Ratio, Maximum

See Figure 19 for RCOMP/RROT PT, rotation

point = 100 mV rms

15:1

Control Feedthrough

15:1 compression, rotation point = −10 dBu,

R2 = 1.5 kΩ

±5

mV

POWER SUPPLY

Supply Voltage Range

V+

4.5

5.5

V

Supply Current

ISY

7.5

10

mA

Quiescent Output Voltage Level

2.2

V

Power Supply Rejection Ratio

PSRR

50

dB

POWER DOWN

Supply Current

Pin 12 = V+2

10

100

µA

1

0 dBu = 0.775 V rms.

2

Normal operation for Pin 12 is 0 V.

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