SSM2166 datasheet(4/16 Pages) AD

Part #	SSM2166

Description	Microphone Preamplifier with Variable Compression and Noise Gating

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REV. B

–4–

SSM2166–Typical Performance Characteristics

0

–80

0

–70

–60

–50

–40

–30

–20

–10

–40

–50

–60

–70

–20

–30

TA = +25°C

V+ = 5V

VIN = 300mV rms @ 1kHz

RL = 100k

NOISE GATE SETTING

550µV rms

ROTATION POINT

300mV rms

GAIN ADJUST (PIN 2) = 1.25k

COMP RATIO = 1:1

COMP RATIO = 2:1

COMP RATIO = 5:1

COMP RATIO = 10:1

COMP RATIO = 15:1

INPUT – dBu

TPC 1. Output vs. Input Characteristics

RGATE – k

10

1

0.1

0

450

50 100

350 400

150 200 250 300

500 550 600 650

100

TA = +25°C

V+ = 5V

RL = 100k

COMPRESSION RATIO = 2:1

ROTATION POINT

1V rms

GAIN ADJUST (PIN 2) = 1.25k

TPC 2. Noise Gate vs. RGATE (Pin 9 to V+)

COMPRESSION

RATIO

ROTATION POINT

1:1

2:1

5:1

10:1

15:1

100mV rms

0

300mV rms

0

1V rms

0

12.5

96

215

395

RCOMP – k , TYPICAL

TPC 3. Compression Ratio vs. RCOMP (Pin 10 to GND)

GAIN ADJUST RESISTOR – k

20

6

0

026

2

468

10 12 14

16 18

20 22 24

18

8

4

2

14

10

16

12

28

30

TA = +25°C

V+ = 5V

RL = 100k

VIN = 100mV rms @ 1kHz

NOISE GATE SETTING

550 V rms

ROTATION POINT (PIN 11)

1V rms

COMPRESSION RATIO = 1:1

TPC 4. VCA Gain vs. RGAIN (Pin 2 to GND)

INPUT VOLTAGE – V rms

5

1

0.1

0.01

1

0.1

0.05

RL = 10k

RL = 100k

TA = +25°C

V+ = 5V

COMPRESSION RATIO = 1:1

NOISE GATE SETTING

550 V rms

ROTATION POINT

1V rms

GAIN ADJUST (PIN 2) = 1.25k

VIN FREQUENCY = 1kHz

TPC 5. THD + N (%) vs. Input (V rms)

FREQUENCY – Hz

5

1

0.1

20

30k

100

0.05

1k

10k

TA = +25°C

V+ = 5V

VIN = 77.5mV rms @ 1kHz

COMPRESSION RATIO = 1:1

NOISE GATE SETTING

550 V rms

ROTATION POINT

1V rms

GAIN ADJUST (PIN 2) = 1.2k

MEASUREMENT FILTER BW: 22Hz TO 30kHz

TPC 6. THD + N (%) vs. Frequency (Hz)

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