T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n
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TA2022 KLI/1.2/07-04
TA2022
STEREO 90W (4
) CLASS-TTM DIGITAL AUDIO AMPLIFIER
DRIVER USING DIGITAL POWER PROCESSING (DPPTM)
TECHNOLOGY
T e c h n i c a l I n f o r m a t i o n R e v i s i o n 1 . 2 J U L Y 2 0 0 4
G E N E R A L D E S C R I P T I O N
The TA2022 is a 90W (4
) continuous average per channel Class-T Digital Audio Power Amplifier IC
using Tripath's proprietary Digital Power Processing (DPP
TM
) technology. Class-T amplifiers offer
both the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers.
A P P L I C A T I O N S
DVD Players
Mini/Micro Component Systems
Home Theater
Powered Speakers
B E N E F I T S
Fully integrated solution with internal
FETs
Dramatically improves efficiency versus
Class-AB amplifiers
Signal fidelity equal to high quality linear
amplifiers
High dynamic range compatible with
digital media such as CD and DVD
F E A T U R E S
Class-T architecture
High Power
100W @ 4
, 1.0% THD+N
90W @ 4
, 0.1% THD+N
60W @ 8
, 0.1% THD+N
"Audiophile" Sound Quality
0.015% THD+N @ 70W 4
0.015% THD+N @ 45W 8
0.10% IHF-IM @ 25W 4
High Efficiency
92% @ 88W 8
87% @ 125W 4
Dynamic Range = 102 dB
Mute Input
Integrated Gate Drive Supply
Over-current protection
Over and under-voltage protection
Single ended outputs
Outputs can be operated in bridged mode
32-pin SSIP package
T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n
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TA2022 KLI/1.2/07-04
A B S O L U T E M A X I M U M R A T I N G S
(Note 1)
SYMBOL PARAMETER
Value
UNITS
VPP, VNN
Supply Voltage (VPP1, VPP2, VNN1, VNN2)
+/- 40
V
V5
Positive 5V Bias Supply
Voltage at Input Pins (pins 18, 19, 23, 24, 26, 28-32)
6
-0.3V to (V5+0.3V)
V
V
VN10
Voltage for low-side FET drive
VNN+13
V
T
STORE
Storage Temperature Range
-55º to 150º
C
T
A
Operating Free-air Temperature Range (Note 2)
-40º to 85º
C
T
J
Junction Temperature
150º
C
ESD
HB
ESD Susceptibility Human Body Model (Note 3)
All pins (except pin 27)
Pin 27
4000
1500
V
V
ESD
MM
ESD Susceptibility Machine Model (Note 4)
All pins
200
V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
See the table below for Operating Conditions.
Note 2: This is a target specification. Characterization is still needed to validate this temperature range.
Note 3: Human body model, 100pF discharged through a 1.5K
resistor.
Note 4: Machine model, 220pF 240pF discharged through all pins.
O P E R A T I N G C O N D I T I O N S
(Note 5)
SYMBOL PARAMETER MIN.
TYP.
MAX.
UNITS
VPP, VNN
Supply Voltage (VPP1, VPP2, VNN1, VNN2)
+/- 12
+/-31
+/- 36
V
V5
Positive 5 V Bias Supply
4.5
5
5.5
V
VN10
Voltage for FET drive (Volts above VNN)
9
11
12
V
Note 5: Recommended Operating Conditions indicate conditions for which the device is functional.
See Electrical Characteristics for guaranteed specific performance limits.
T H E R M A L C H A R A C T E R I S T I C S
SYMBOL PARAMETER
VALUE
UNITS
JC
Junction-to-case Thermal Resistance
1.0
°
C/W
JA
Junction-to-ambient Thermal Resistance (still air)
20
°
C/W
T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n
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TA2022 KLI/1.2/07-04
E L E C T R I C A L C H A R A C T E R I S T I C S
(Notes 6, 7)
T
A
= 25
°C. See Application/Test Circuit on page 8. Unless otherwise noted, the supply voltage is
VPP=|VNN|=31V.
SYMBOL PARAMETER
CONDITIONS MIN.
TYP.
MAX.
UNITS
I
q
Quiescent Current
(No load, Mute = 0V)
VPP = +31V
VNN = -31V (Note 8)
V5 = 5V (Note 9)
VN10 = 11V (Note 10)
20
55
45
65
60
80
mA
mA
mA
mA
I
MUTE
Mute Supply Current
(No load, Mute = 5V)
VPP = +31V
VNN = -31V (Note 8)
V5 = 5V (Note 9)
0.5
2
20
25
mA
mA
mA
V
IH
High-level input voltage (MUTE)
I
IH
= See Mute Control Section
3.5
V
V
IL
Low-level input voltage (MUTE)
I
IL
= See Mute Control Section
1.0
V
V
OH
High-level output voltage (HMUTE) I
OH
= 3mA
4.0
V
V
OL
Low-level output voltage (HMUTE) I
OL
= 3mA
0.5
V
V
OFFSET
Output Offset Voltage
No Load, MUTE = Logic low
0.1% R
FBA
, R
FBB
, R
FBC
resistors
-750 750 mV
I
OC
Over Current Sense Threshold
TBD
7
8
A
I
VPPSENSE
VPPSENSE Threshold Currents
Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)
138
62
162
154
79
72
178
87
µA
µA
µA
µA
V
VPPSENSE
Threshold Voltages with
R
VPPSENSE
= 249K
(Note 11, Note 12)
Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)
36.5
17.8
42.8
40.9
22.2
20.4
47.3
24.4
V
V
V
V
I
VNNSENSE
VNNSENSE Threshold Currents
Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)
152
65
174
169
86
77
191
95
µA
µA
µA
µA
V
VNNSENSE
Threshold Voltages with
R
VNNSENSE
= 249K
(Note 11, Note 12)
Over-voltage turn on (muted)
Over-voltage turn off (mute off)
Under-voltage turn off (mute off)
Under-voltage turn on (muted)
-36.2
-14.8
-42.1
-40.8
-20.2
-17.9
-46.8
-22.6
V
V
V
V
T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n
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TA2022 KLI/1.2/07-04
P E R F O R M A N C E C H A R A C T E R I S T I C S S I N G L E E N D E D
(Notes 6, 7)
T
A
= 25
°C. Unless otherwise noted, the supply voltage is VPP=|VNN|=31V, the input frequency
is 1kHz and the measurement bandwidth is 20kHz. See Application/Test Circuit on Page 8.
SYMBOL PARAMETER
CONDITIONS MIN.
TYP.
MAX.
UNITS
P
OUT
Output Power
(Continuous Average/Channel)
(Note 13)
VPP = |VNN| = +/-31V, R
L
= 4
THD+N = 0.1%
THD+N = 1.0%
THD+N = 10%
VPP = |VNN| = +/-35V, R
L
= 8
THD+N = 0.1%
THD+N = 10%
80
90
100
125
60
88
W
W
W
W
W
THD + N Total Harmonic Distortion Plus
Noise
P
OUT
= 70W/Channel, R
L
= 4
VPP = |VNN| = +/-31V
P
OUT
= 45W/Channel, R
L
= 8
VPP = |VNN| = +/-35V
0.015
0.015
%
%
IHF-IM
IHF Intermodulation Distortion
19kHz, 20kHz, 1:1 (IHF), R
L
= 4
P
OUT
= 25W/Channel
0.1 %
SNR Signal-to-Noise
Ratio
A-Weighted
0dB = 90W/Channel, R
L
= 4
102
dB
CS Channel
Separation
0dB = 25W, R
L
= 4
83 dB
A
V
Amplifier
Gain
P
OUT
= 10W/Channel, R
L
= 4
,
See Application / Test Circuit
18.1 V/V
A
VERROR
Channel to Channel Gain Error
P
OUT
= 10W/Channel, R
L
= 4
See Application / Test Circuit
0.5
dB
Power Efficiency
P
OUT
= 88W/Channel, R
L
= 8
P
OUT
= 125W/Channel, R
L
= 4
92
87
%
%
I
SLOAD
Source
Current
P
OUT
= 125W/Channel, R
L
= 4
VPP = +31V
VNN = -31V
V5 = 5V
4.59
4.61
45
A
A
mA
e
NOUT
Output Noise Voltage
A-Weighted, input AC grounded
150
µV
P E R F O R M A N C E C H A R A C T E R I S T I C S B R I D G E D T I E D L O A D
(Notes 6, 7)
T
A
= 25
°C. Unless otherwise noted, the supply voltage is VPP=|VNN|=30V, the input frequency
is 1kHz and the measurement bandwidth is 20kHz.
SYMBOL PARAMETER
CONDITIONS MIN.
TYP.
MAX.
UNITS
P
OUT
Output Power
(Continuous Average)
(Note 13)
VPP = |VNN| = +/-30V, R
L
= 8
THD+N = 0.1%
THD+N = 10%
150
235
W
W
THD + N Total Harmonic Distortion Plus
Noise
P
OUT
= 100W, R
L
= 8
0.05
%
IHF-IM
IHF Intermodulation Distortion
19kHz, 20kHz, 1:1 (IHF), R
L
= 8
P
OUT
= 25W
0.10 %
Power Efficiency
P
OUT
= 225W, R
L
= 8
87 %
SNR Signal-to-Noise
Ratio
A-Weighted, R
L
= 8
0dB = 150W
104
dB
e
NOUT
Output Noise Voltage
A-Weighted, input AC grounded
220
µV
Note 6:
Minimum and maximum limits are guaranteed but may not be 100% tested.
Note 7:
For operation in ambient temperatures greater than 25
°C, the device must be derated
based on the maximum junction temperature and the thermal resistance determined
by the mounting technique.
T r i p a t h T e c h n o l o g y, I n c . - T e c h n i c a l I n f o r m a t i o n
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TA2022 KLI/1.2/07-04
Note 8:
This specification includes the current draw from the internal buck regulator. If an
external floating supply is used, instead of the internal buck regulator, the quiescent
current draw of the VNN supply will be approximately 20mA.
Note 9:
This specification includes the current draw from both the TA2022 and the external
feedback biasing.
Note 10:
This is the current draw of the VN10 pin if an external "floating" 11V supply is used
instead of the internal buck regulator
Note 11:
These supply voltages are calculated using the IVPPSENSE AND IVNNSENSE
values shown in the Electrical Characteristics table. The typical voltage values
shown are calculated using a RVPPSENSE and RVNNSENSE value of 249kohm
without any tolerance variation. The minimum and maximum voltage limits shown
include either a +1% or 1% (+1% for Over-voltage turn on and Under-voltage turn
off, -1% for Over-voltage turn off and Under-voltage turn on) variation of
RVPPSENSE or RVNNSENSE off the nominal 249kohm value. These voltage
specifications are examples to show both typical and worst case voltage ranges for a
given RVPPSENSE and RVNNSENSE resistor value of 249kohm. Please refer to
the Application Information section for a more detailed description of how to calculate
the over and under voltage trip voltages for a given resistor value.
Note 12:
The fact that the over-voltage turn on and over-voltage turn off specifications exceed
the absolute maximum of +/-40V for the TA2022 does not imply that the part will work
at these elevated supply voltages. It also does not imply that TA2022 is tested or
guaranteed at these supply voltages. The supply voltages are simply a calculation
based on the process spread of the I
VPPSENSE
and I
VNNSENSE
currents (see Note 11).
The supply voltage must be maintained below the absolute maximum of +/-40V or
permanent damage to the TA2022 may occur.
Note 13:
The supply voltage limitation for 4 ohm single ended (+/-31V), or 8 ohm bridged (+/-
30V), is based on the current limit protection circuitry. The current limit circuitry may
be activated during large output excursions if the recommended supply voltage
ranges are exceeded.
This will result in the amplifier being muted.
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