Preliminary Technical Data
Integrated Stereo Modulator & Power Stage
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
Low Cost DMOS Process
Flat Panel Televisions
PC Audio Systems
Class-D Audio Power Amplifier
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)
M O D U L AT O R
M O D U L AT O R
R E F _ F ILT
AV D D
V O LTA G E
T E M P E R AT U R E
O S C ILL ATO R
MODE CONTROL LOGIC
30 29 19 18 17 49
22 21 20
Figure 1. Block Diagram
Rev. PrA – 1/20/05
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