MAX9814 Просмотр технического описания (PDF) - Maxim Integrated

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MAX9814

Microphone Amplifier with AGC and Low-Noise Microphone Bias

Maxim Integrated 

Microphone Amplifier with AGC and

Low-Noise Microphone Bias

ABSOLUTE MAXIMUM RATINGS

VDD to GND ..............................................................-0.3V to +6V

All Other Pins to GND.................................-0.3V to (VDD + 0.3V)

Output Short-Circuit Duration.....................................Continuous

Continuous Current (MICOUT, MICBIAS).......................±100mA

All Other Pins ....................................................................±20mA

Continuous Power Dissipation (TA = +70°C)

14-Pin TDFN-EP

(derate 16.7mW/°C above +70°C) ........................1481.5mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

Bump Temperature (soldering) Reflow............................+235°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VDD = 3.3V, SHDN = VDD, CCT = 470nF, CCG = 2µF, GAIN = VDD, TA = TMIN to TMAX, unless otherwise specified. Typical values are

at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

GENERAL

Operating Voltage

Supply Current

Shutdown Supply Current

Input-Referred Noise Density

Output Noise

Signal-to-Noise Ratio

VDD

IDD

ISHDN

en

SNR

Guaranteed by PSRR test

BW = 20kHz, all gain settings

BW = 20kHz

BW = 22Hz to 22kHz

(500mVRMS output signal)

A-weighted

2.7

5.5

V

3.1

6

mA

0.01

1

µA

30

nV/√Hz

430

µVRMS

61

dB

64

Dynamic Range

DR

(Note 2)

60

dB

Total Harmonic Distortion Plus

Noise

Amplifier Input BIAS

Maximum Input Voltage

Input Impedance

Maximum Gain

THD+N

VIN

VIN_MAX

ZIN

A

fIN = 1kHz, BW = 20Hz to 20kHz,

RL = 10kΩ, VTH = 1V (threshold = 2VP-P),

VIN = 0.5mVRMS, VCT = 0V

fIN = 1kHz, BW = 20Hz to 20kHz,

RL = 10kΩ, VTH = 0.1V (threshold =

200mVP-P), VIN = 30mVRMS, VCT = 2V

1% THD

1.14

GAIN = VDD

39.5

GAIN = GND

49.5

0.04

0.2

1.23

100

100

40

50

%

1.32

40.5

50.6

V

mVP-P

kΩ

dB

GAIN = unconnected

59.5

60

60.5

Minimum Gain

GAIN = VDD

GAIN = GND

18.7

20

20.5

29.0

30

30.8

dB

GAIN = unconnected

38.7

40

40.5

Maximum Output Level

Regulated Output Level

AGC Attack Time

VOUT_RMS

tATTACK

1% THD+N, VTH = MICBIAS

AGC enabled, VTH = 0.7V

CCT = 470nF (Note 3)

A/R = GND

1.26

0.707

1.40

1.1

1:500

1.54

VRMS

VP-P

ms

Attack/Release Ratio

A/R

A/R = VDD

A/R = unconnected

1:2000

1:4000

ms/ms

2 _______________________________________________________________________________________

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