Allegro UDN3718M Datasheet
3718
LOW-VOLTAGE AUDIO POWER AMPLIFIER
DISCONTINUED PRODUCT
— FOR REFERENCE ONLY
Providing a low-cost, compact alternative to discrete transistor
amplifiers, the ULN3718M integrated circuit is ideal for application
as a headphone driver in portable radios, tape players, and other
battery-operated equipment. The low-power audio amplifier’s wide
frequency response and low noise ensure premium performance.
The amplifier will operate (at reduced volume) with supply voltages
as low as 1.8 V without a significant increase in distortion. This feature
allows operation with a 3 V battery supply and minimizes concern
about weak batteries. The class-AB audio amplifier has low quiescent
current drain for maximum battery life. This device is rated for operation with supply voltages up to 9 V.
The ULN3718M audio amplifier is supplied in an 8-pin mini-DIP
plastic package. A copper alloy lead frame gives the amplifier enhanced power dissipation ratings.
FEATURES
■ Wide Operating Voltage Range 1.8 - 9.0 V
■ Low Quiescent Current
■ AC Short-Circuit Protection
■ Low External Parts Count
■ Low Distortion
■ 40 dB Voltage Gain
■ Low Noise
3718
LOW-VOLTAGE
AUDIO POWER AMPLIFIER
Always order by complete part number: ULN3718M .
Data Sheet
27117.25
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC. . . . . . . . . . . . . . 10 V
Package Power Dissipation,
P
D
. . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
T
A
. . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
T
S
. . . . . . . . . . . . . . . -65°C to +150°C
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 V
CC
1.8 3.0 9.0 V
Quiescent Supply Current I
CC
VCC = 3.0 V — 6.0 10 mA
V
CC
= 6.0 V — 9.0 15 mA
VCC = 9.0 V — 12 20 mA
Voltage Gain A
V
36 40 44 dB
Audio Power Output P
OUT
RL = 8Ω, VCC = 3.0 V, THD = 10% — 80 — mW
RL = 8Ω, VCC = 6.0 V, THD = 10% 250 430 — mW
R
L
= 32Ω, VCC = 3.0 V, THD = 10% 15 25 — mW
R
L
= 32Ω, VCC = 6.0 V, THD = 10% — 125 — mW
Distortion THD P
OUT
= 10 mW — 0.3 1.0 %
P
OUT
= 1.0 mW, VCC = 1.8 V — 1.5 3.0 %
Output Noise V
out
Input Shorted, BW = 80 kHz — 200 500 µV
Input Resistance R
IN
Pin 8 — 250 — kΩ
Power Supply Rejection PSRR C
D
(Pin 1) = 500 µF, f = 120 Hz — 28 — dB
ELECTRICAL CHARACTERISTICS at T
A
= +25°C, V
CC
= 3 V, R
L
= 32Ω, f
in
= 400 Hz
(unless otherwise noted).
TEST CIRCUIT AND TYPICAL
APPLICATION
50 75 100 125 150
0.5
0
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
TEMPERATURE IN °C
2.0
1.5
1.0
25
Dwg. GP-009-1B
R = 55°C/W
θJC
FREE AIR, R = 80°C/W
θJA
W
Copyright © 1985, 1995, Allegro MicroSystems, Inc.
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