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Analog Devices Semiconductor Electronic Components Datasheet



AD1991

Class D/1-Bit Audio Power Output Stage


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AD1991 pdf
Class D/1-Bit Audio Power Output Stage
AD1991
FEATURES
Class D/1-Bit Audio Power Output Stage
5 V Analog and Digital Supply Voltages
Power Stage Power Supply 8 V to 20 V
Output Power @ 0.1% THD + N
Stereo Mode
2 ؋ 20 W @ 4 @ 14.4 V
2 ؋ 20 W @ 8 @ 20 V
Mono Mode
1 ؋ 40 W @ 4 @ 20 V
RON < 320 m(per Transistor)
Efficiency > 85% @ Full Power/8
Clickless Mute Function
Turn-On and Turn-Off Pop Suppression
Short-Circuit Protection
Overtemperature Protection
Data Loss Protection
2-Channel BTL Outputs or
4-Channel Single-Ended Outputs
52-Lead Exposed Pad TQFP Package
Low Cost DMOS Process
APPLICATIONS
PC Audio Systems
Minicomponents
Automotive Amplifiers
Home Theater Systems
Televisions
GENERAL DESCRIPTION
The AD1991 is a 2-channel BTL or 4-channel single-ended
class D audio power output stage. The part is configured during
reset to be in either 2-channel mode or 4-channel mode.
To protect the IC as well as the connected speakers, the AD1991
provides turn-on and turn-off pop suppression, short-circuit
protection, and overtemperature shutdown. To control the IC,
a power-down/reset input and a mute pin are available.
The output stage can be operated over a power supply range
from 8 V to 20 V.
In 2-channel mode, Transistors A1, B2, C1, and D2 are turned
on by a Logic 1 on inputs INA and INC, and Transistors A2,
B1, C2, and D1 are turned on by a Logic 0 on inputs INA and
INC. In 4-channel mode, Transistors A1, B1, C1, and D1 are
turned on by a Logic 1 on the four inputs, and Transistors A2,
B2, C2, and D2 are turned on by a Logic 0 on the four inputs
(see the Functional Block Diagrams).
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. 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.
FUNCTIONAL BLOCK DIAGRAMS
2-Channel Mode
AVDD DVDD
INA
LEFT
INPUT
PVDD
6
OUTA
A1
3
A2
INB
INC
RIGHT
INPUT
B1
B2
LEVEL SHIFTER
AND
SWITCH CONTROL
H-BRIDGE
C1
C2
OUTB
3
OUTC
3
IND
CLK
RST/PDN
MUTE
D1
D2
،n
THERMAL PROTECTION
SHORT-CIRCUIT PROTECTION
MUTE CONTROL
OUTD
3
CURRENT OVERLOAD
THERMAL SHUTDOWN
THERMAL WARNING
DATA LOSS
4 2 14
AGND DGND TEST PGND
CONTROL
4-Channel Mode
AVDD DVDD
PVDD
6
INA A1 OUTA
3
A2
INB B1 OUTB
3
B2
LEVEL SHIFTER
AND
SWITCH CONTROL
H-BRIDGE
INC C1 OUTC
3
C2
LOAD
REQUIRING
DC VOLTAGE
SUPPLY
IND
CLK
RST/PDN
MUTE
D1
D2
،n
THERMAL PROTECTION
SHORT-CIRCUIT PROTECTION
MUTE CONTROL
OUTD
3
LOAD
REQUIRING
DC VOLTAGE
SUPPLY
CURRENT OVERLOAD
THERMAL SHUTDOWN
THERMAL WARNING
DATA LOSS
4 2 14
AGND DGND TEST PGND
CONTROL
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.



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AD1991 pdf
AD1991–SPECIFICATIONS1 (AVDD = 5 V, DVDD = 5 V, PVDDX = 20 V, Ambient Temperature = 25؇C,
Load Impedance = 8 , unless otherwise noted.)
Parameter
OUTPUT POWER PO (f = 1 kHz SINE WAVE)2
EFFICIENCY
RON
Per High-Side Transistor
Per Low-Side Transistor
Temperature Coefficient
THERMAL WARNING ACTIVE
THERMAL SHUTDOWN ACTIVE
OVERCURRENT SHUTDOWN ACTIVE
POWER SUPPLIES
Supply Voltage AVDD
Supply Voltage DVDD
Supply Voltage PVDDX
Power-Down Current
AVDD
DVDD
PVDDX
Operating Current
AVDD
DVDD
PVDDX
DIGITAL I/O
Input Voltage High
Input Voltage Low
Output Voltage High
Output Voltage Low
Leakage Current on Digital Inputs
NOTES
1Performance of both channels is identical.
2Measurement requires PWM modulator.
Specifications subject to change without notice.
Min Typ Max Unit Test Conditions
20 W RL = 4 , PVDDX = 14 V
20 W RL = 8 , PVDDX = 20 V
87 % f = 1 kHz, PO = 20 W, RL = 8
260 320 m@ 1 A
190 235 m@ 1 A
0.7 mΩ/°C
135 °C Die temperature
150 °C Die temperature
3.8 5
6.75 A
4.5 5.0 5.5 V
4.5 5.0 5.5 V
6.5 8 to 20 22.5 V
6 14 µA RST/PDN held low
1 13 µA RST/PDN held low
17 µA RST/PDN held low
1.8 2.75 mA
4 5.2 mA
40 mA 50:50 384 kHz square wave on
INA and INC
2.0
DVDD – 0.8
DVDD
1.2
0.4
10
V
V
V
V
µA
@ 2 mA
@ 2 mA
DIGITAL TIMING CHARACTERISTICS (Guaranteed over –40؇C to +85؇C, AVDD = DVDD = 5 V ؎ 10%, PVDDX = 20 V ؎ 10%,
Edge Speed = Slowest, Nonoverlap Time = Shortest.)
Symbol
Parameter
tPDL
tPST
tNOL
tPDRP
tMSU
tMH
tMPDL
Input transition to output initial response
Power transistor switching time
Nonoverlap time
RST/PDN minimum low pulsewidth
Mode pin setup time before RST/PDN going high
Mode pin hold time after RST/PDN going high
MUTE asserted to output initial response
Specifications subject to change without notice.
Min
Typ
Max
Unit
30 ns
3.5 ns
25 to 40
ns
20 ns
5 ns
5 ns
3 s
–2– REV. 0



Part Number AD1991
Description Class D/1-Bit Audio Power Output Stage
Maker Analog Devices - Analog Devices
Total Page 11 Pages
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