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AD1990ACPZ-AD1992ACPZ-AD1994ACPZ
Class-D Audio Power Amplifier – 2 × 5W
Class-D Audio Power AmplifierRev. PrA – 1/20/05
FEATURES
Integrated Stereo Modulator & Power Stage
0.005% THD+N
101.5dB Dynamic Range
PSRR > 65 dB
RDS-ON < 0.3 Ω (per transistor)
Efficiency > 80% @ 5W/6 Ω
EMI Optimized Modulator
On-Off-Mute Pop Noise Suppression
Short Circuit Protection
Over-Temperature Protection
Low Cost DMOS Process
APPLICATIONS
Flat Panel Televisions
Automotive Amplifiers
PC Audio Systems
Mini Components
GENERAL DESCRIPTION The AD199x is a two channel Bridge Tied Load (BTL)
switching audio power amplifier with integrated ∑∆ modulator.
The modulator accepts a 1Vrms input signal (maximum power)
and generates a switching waveform to drive speakers directly.
One of the two modulators can control both output stages
providing twice the current for single-channel applications. A
digital, microcontroller-compatible interface provides control of
reset, mute and PGA gain as well as output signals for thermal
and over-current error conditions. The output stage can operate
from supply voltages ranging from 8V to 20V. The analog
modulator and digital logic operate from a 5V supply.
AD1990: 5Wx2 (10Wx1)
AD1992: 10Wx2 (20Wx1)
AD1994: 25Wx2 (50Wx1)
AD1996: 40Wx2 (80Wx1) Figure 1. Block Diagram
TABLE OF CONTENTSGeneral Description........................................................................1
AD199x—Specifications..................................................................3
test conditions unless otherwise noted......................................3
Absolute Maximum Ratings............................................................6
Pin Configurations And Functional Descriptions.......................7
Typical Performance Characteristics.............................................8
Functional Description..................................................................10
Device Architecture...................................................................10
Amplifier Gain............................................................................10
System Design.............................................................................11
Outline Dimensions.......................................................................14
ESD Caution................................................................................14
AD199X—SPECIFICATIONS
TEST CONDITIONS UNLESS OTHERWISE NOTED Supply Voltages
AVDD 5 V
DVDD 5 V
PVDDX 12 V
Ambient Temperature 25 °C
Load Impedance 6 Ω
Clock Frequency 11.2896 MHz
Measurement Bandwidth 20 Hz to 20 KHz
Table 1. Performance of both channels is identical
Table 2 DIGITAL TIMING (Guaranteed over -40°C to +85°C, AVDD = DVDD = 5.0V ± 10%, PVDDX =12V ± 10%, Non Overlap Time
tNOL = Shortest, See Table 6: Non-Overlap Time Settings) Figure 2. Output Timing
Figure 3. Mute Timing
Figure 4. Reset to Mute Delay
ABSOLUTE MAXIMUM RATINGS
Table 3. AD199x Absolute Maximum Ratings1 Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or
any other condition s above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability. Only one absolute maximum rating may be
applied at any one time. Including any induced voltage due to inductive load
Figure 5. 64 Lead LFCSP Package
PIN CONFIGURATIONS AND FUNCTIONAL DESCRIPTIONS
Table 4. Pin Function Descriptions
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency(Hz)2468101214161820–160
tivFigure 6. 1KHz, 100mW into a 6Ω Load
tiv
Frequency(KHz)Figure 7. 1KHz, 1W into a 6Ω Load
FREQUENCY(KHz)Figure 8. 1KHz, 5W into a 6Ω Load
FREQUENCY-KHz
-00Figure 9. 7KHz, 1W into a 6Ω Load
