Analog Devices AD1990 Preliminary Technical Data

Preliminary Technical Data
FEATURES
Integrated Stereo Modulator & Power Stage
0.005% THD+N
101.5dB Dynamic Range
PSRR > 65 dB
< 0.3 Ω (per transistor)
R
DS-ON
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
7,8
PVDD
4,5,6
OUTL+
1,2,3
PGND1
9,10
PVDD1
11,12,13
OUTL-
14,15,16
PGND1
PGND1
55
REF_FILT
57
AVDD
56
AGND
24,25
DVDD
23,26
DGND
Rev. PrA – 1/20/05
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective companies.
62 63
LEFT CHANNEL
LEVEL
SHIFT
Σ∆
+
DEAD MODULATOR
TIME
CONTROL
DRIVER
HIGH SIDE
DRIVER
LOW SIDE
Ø1 Ø2
VOLTAGE
REFERENCE
OSCILLATOR
TEMPERATURE
SENSE &
OVER-CURRENT
PROTECTION
27 28
CLKI CLKO
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
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)
60 53 50
32 31
Σ∆
PGA PGA
MODULATOR
Ø1
MODE CONTROL LOGIC
30 29 19 18 17 49
Figure 1. Block Diagram
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703
51
RIGHT CHANNEL
PVDD2
DRIVER
HIGH SIDE
DRIVER
LEVEL
LOW SIDE
SHIFT
PGND2
+
DEAD
PVDD2
TIME
CONTROL
DRIVER
HIGH SIDE
DRIVER
LOW SIDE
PGND2
Ø2
MUTE/
POP
CONTROL
22 21 20
© 2005 Analog Devices, Inc. All rights reserved.
∆ modulator.
∑
41,42
PVDD2
43,44,45
OUTR+
46,47,48
PGND2
39,40
PVDD2
36,37,38
OUTR-
33,34,35
PGND2
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