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Analog Devices Semiconductor Electronic Components Datasheet

AD1990 Datasheet

Audio Switching Amplifier

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AD1990 pdf
Audio Switching Amplifier
AD1990
FEATURES
Integrated stereo modulator and power stage
<0.002% THD + N
101 dB dynamic range (A-weighted)
2 × 5 W output power (4 Ω, <0.01% THD + N)
RDS-ON < 0.3 Ω (per transistor)
PSRR > 65 dB
On-off-mute pop noise suppression
EMI optimized modulator
Short-circuit protection
Overtemperature protection
Low cost DMOS process
GENERAL DESCRIPTION
The AD1990 is a 2-channel, bridge tied load (BTL), switching
audio power amplifier with integrated Σ-Δ modulator. The
modulator accepts a single-ended, analog input signal and
converts it to a switching waveform to drive speakers directly. A
digital, microprocessor-compatible interface provides control of
reset, mute, and PGA gain, as well as feedback signals for thermal
and overcurrent error conditions. The output stage can operate
over a power supply voltages range of 8 V to 12 V. The analog
modulator and digital logic operate from a 5 V supply.
APPLICATIONS
Advanced televisions
Compact multimedia systems
Minicomponents
FUNCTIONAL BLOCK DIAGRAM
PGA1 PGA0
AVDD
AD1990
AINL
PGA
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DVDD
Σ-Δ
MODULATOR
A1
A2
FEEDBACK
NETWORK
PVDD
OUTL+
AINR
CLKI
CLKO
REF_FILT
PGA
Σ-Δ
MODULATOR
LEVEL
SHIFTER
AND
DEAD TIME
CONTROL
OSCILLATOR
MODE CONTROL
LOGIC AND
POP/CLICK
SUPPRESSION
VOLTAGE
REFERENCE
B1
B2
H-BRIDGE
C1
C2
D1
D2
OUTL–
OUTR+
OUTR–
AGND
PGND
Figure 1.
FEEDBACK
NETWORK
Rev. 0
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.


Analog Devices Semiconductor Electronic Components Datasheet

AD1990 Datasheet

Audio Switching Amplifier

No Preview Available !

AD1990 pdf
AD1990
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 11
Overview ..................................................................................... 11
Σ-Δ Modulator............................................................................ 11
MUTE and RESET ..................................................................... 11
Gain Structure............................................................................. 11
Power Stage ................................................................................. 13
Clocking....................................................................................... 13
Protection Circuits and Error Reporting ................................ 14
Application Circuits ....................................................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 16
REVISION HISTORY
4/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 16


Part Number AD1990
Description Audio Switching Amplifier
Maker Analog Devices
Total Page 16 Pages
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