3718 datasheet(2/6 Pages) ALLEGRO

2 / 6 page

3718

LOW-VOLTAGE AUDIO POWER AMPLIFIER

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage Range

VCC

1.8

3.0

9.0

Quiescent Supply Current

ICC

VCC = 3.0 V

—

6.0

VCC = 6.0 V

—

9.0

VCC = 9.0 V

—

Voltage Gain

Audio Power Output

POUT

RL = 8

Ω, V

CC = 3.0 V, THD = 10%

—

RL = 8

Ω, V

CC = 6.0 V, THD = 10%

250

430

—

RL = 32

Ω, V

CC = 3.0 V, THD = 10%

—

RL = 32

Ω, V

CC = 6.0 V, THD = 10%

—

125

—

Distortion

THD

POUT = 10 mW

—

0.3

1.0

POUT = 1.0 mW, VCC = 1.8 V

—

1.5

3.0

Output Noise

Vout

Input Shorted, BW = 80 kHz

—

200

500

µV

Input Resistance

RIN

Pin 8

—

250

—

Ω

Power Supply Rejection

PSRR

CD (Pin 1) = 500

µF, f = 120 Hz

—

ELECTRICAL CHARACTERISTICS at TA = +25°C, VCC = 3 V, RL = 32Ω, fin = 400 Hz

(unless otherwise noted).

TEST CIRCUIT AND TYPICAL

APPLICATION

100

125

150

0.5

TEMPERATURE IN

°C

2.0

1.5

1.0

Dwg. GP-009-1B

= 55

°C/W

θJC

FREE AIR, R

= 80

°C/W

θJA

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