AD1990 Datasheet, PDF (1/16 Pages) Analog Devices – Class-D Audio Power Amplifier

Preliminary Technical Data
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
Class-D Audio Power Amplifier
AD1990/AD1992/AD1994/AD1996
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)
62
63
32
31 60
53
7,8
PVDD
4,5,6
OUTL+
1,2,3
PGND1
9,10
PVDD1
11,12,13
OUTL-
14,15,16
PGND1
PGND1
LEFT CHANNEL
DRIVER
HIGH SIDE
LEVEL
SHIFT
+
DEAD
TIME
CONTROL
DRIVER
LOW SIDE
Σ∆
M O D U L AT O R
PGA
PGA
50
51
RIGHT CHANNEL
Σ∆
M O D U L AT O R
DRIVER
HIGH SIDE
LEVEL
SHIFT
+
DEAD
TIME
CONTROL
DRIVER
LOW SIDE
DRIVER
HIGH SIDE
DRIVER
LOW SIDE
PVDD2
PGND2
PVDD2
PGND2
41,42
PVDD2
43,44,45
OUTR+
46,47,48
PGND2
39,40
PVDD2
36,37,38
OUTR-
33,34,35
PGND2
55
R E F _ F ILT
57
AV D D
56
AGND
24,25
DVDD
23,26
DGND
V O LTA G E
REFERENCE
T E M P E R AT U R E
SENSE &
OVER-CURRENT
PROTECTION
Ø1 Ø2
O S C ILL ATO R
27
28
CLKI CLKO
Ø1 Ø2
MODE CONTROL LOGIC
MUTE/
POP
CONTROL
30 29 19 18 17 49
22 21 20
Figure 1. Block Diagram
Rev. PrA – 1/20/05
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