SSM2167 datasheet(4/8 Pages) AD

Part #	SSM2167

Description	Low Voltage Microphone Preamplifier with Variable Compression and Noise Gating

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REV. A

SSM2167

–4–

– Typical Performance Characteristics

RGATE –

100

10

1

0

3,500

500

1,000

1,500

2,500

2,000

3,000

TA = 25 C

V+ = 3V

RLOAD = 100k

COMPRESSION RATIO 2:1

ROTATION POINT = 63mV rms

TPC 1. Noise Gate vs. RGATE

FREQUENCY – Hz

20

30k

100

1k

10k

1

0.01

0.1

20k

TA = 25 C

V+ = 3V

VIN = 24.5mV rms

COMPRESSION RATIO 1:1

ROTATION POINT = 63mV rms

NOISE GATE SETTING = 1.4mV rms

TPC 2. THD + N vs. Frequency

FREQUENCY – Hz

1k

10M

10k

100k

1M

35

15

5

15

5

25

VIN = 2mV rms

RCOMP = 175k

ROTATION POINT = 63mV rms

NOISE GATE SETTING = 1.4mV rms

TPC 3. GBW Curves vs. VCA Gain

INPUT VOLTAGE – V rms

1

0.1

0.01

10m

1

0.1

TA = 25 C

V+ = 3V

VIN FREQUENCY = 1kHz

RLOAD = 100k

COMPRESSION RATIO 1:1

ROTATION POINT = 63mV rms

NOISE GATE SETTING = 1.4mV rms

TPC 4. THD + N vs. Input

INPUT – dBV

0

80

70

60

50

40

30

20

10

40

50

60

70

20

30

TA = 25 C

V+ = 3V

RL = 100k

ROTATION POINT = 63mV rms

NOISE GATE SETTING = 1.4mV rms

COMPRESSION RATIO 1:1

COMPRESSION RATIO 5:1

COMPRESSION RATIO 10:1

COMPRESSION RATIO 2:1

TPC 5. Output vs. Input Characteristics

FREQUENCY – Hz

10

20

80

10

100k

100

1k

10k

30

40

50

60

70

V+ = 3V + 0.1

RGATE = 5k

RCOMP = 0V

TPC 6. PSRR vs. Frequency

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