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AD1994

Audio Switching Amplifier


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AD1994 pdf
Audio Switching Amplifier
AD1994
FEATURES
GENERAL DESCRIPTION
Integrated stereo modulator and power stage
<0.005% THD + N
105 dB dynamic range (A-weighted)
2 × 25 W output power (6 Ω, 10% THD + N)
1 × 50 W output power (3 Ω, 10% 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
APPLICATIONS
The AD1994 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.
One of the two modulators can control both output stages
providing twice the current and almost twice the efficiency for
single-channel applications. Both modulators can also control
external power devices for arbitrarily high output power. 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 20 V. The analog
modulator and digital logic operate from a 5 V supply.
Advanced televisions
Compact multimedia systems
Minicomponents
FUNCTIONAL BLOCK DIAGRAM
PGA1 PGA0
AVDD
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DVDD
FEEDBACK
NETWORK
PVDD
AD1994
AINL
PGA
Σ-Δ
MODULATOR
A1 OUTL+
A2
MOD_FILT
AINR
CLKI
CLKO
REF_FILT
PGA
ORDER
REDUCER
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
Figure 1.
PGND
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.



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AD1994 pdf
AD1994
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 ...................................................................... 15
Overview...................................................................................... 15
Σ-Δ Modulator............................................................................ 15
MUTE and RESET ..................................................................... 15
Mono Mode................................................................................. 16
Modulator Mode ........................................................................ 16
Gain Structure............................................................................. 16
Power Stage ................................................................................. 17
Clocking....................................................................................... 18
Protection Circuits and Error Reporting ................................ 19
Application Circuits ....................................................................... 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 21
REVISION HISTORY
2/06—Revision 0: Initial Version
Rev. 0 | Page 2 of 24



Part Number AD1994
Description Audio Switching Amplifier
Maker Analog Devices - Analog Devices
Total Page 24 Pages
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