TRIPATH TECHNOLOGY TA2020-020 Datasheet
TECHNICAL INFORMATION
Stereo 20W (4ΩΩΩΩ) Class-T Digital Audio Amplifier using
Digital Power Processing
September, 2000
General Description
The TA2020-020 is a 20W continuous average two-channel Class-T Digital Audio Power
Amplifier IC using Tripath’s proprietary Digital Power Processing
amplifiers offer both the audio fidelity of Class-AB and the power efficiency of Class-D
amplifiers.
Applications
¾DVD Players
¾Mini/Micro Component Systems
¾Automotive Audio
¾Computer / PC Multimedia
¾Cable Set-Top Products
¾Televisions
¾Battery Powered Systems
Benefits
¾Fully integrated solution with FETs
Easier to design-in than Class-D
¾
Reduced system cost with no heat sink
¾
¾Dramatically improves efficiency versus
Class-AB
¾Signal fidelity equal to high quality linear
amplifiers
¾High dynamic range compatible with
digital media such as CD, DVD, and
internet audio
Typical Performance
THD+N versus Output Power
10
VDD = 13.5V
5
Av = 12
f = 1kHz
BW = 22Hz - 22kHz
2
1
0.5
TM
Technology TA2020-020
TM
technology. Class-T
Features
¾Class-T architecture
¾Single Supply Operation
¾“Audiophile” Quality Sound
¾0.03% THD+N @ 10W 4Ω
¾0.1% THD+N @12W 4Ω
¾0.18% IHF-IM @ 1W 4Ω
¾High Power
¾13W @ 8Ω, 10% THD+N
¾23W @ 4Ω, 10% THD+N
¾38W EIAJ* VDD=14.4V @
*saturated square wave output
¾High Efficiency
¾88% @ 12W 8Ω
¾81% @ 20W 4Ω
¾Dynamic Range = 103 dB
X
¾Up to 2
¾Mute and Sleep inputs
¾Turn-on & turn-off pop suppression
¾Over-current protection
¾Over-temperature protection
¾Bridged outputs
¾32-pin SSIP package
25Wrms @ 4Ω, VDD=14.6V
4
Ω
0.2
THD+N (%)
0.1
0.05
0.02
0.01
RL= 8
Ω
1 2 3 4 5 6 7 8 9 10 20500m
Output Power (W)
RL= 4
Ω
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TECHNICAL INFORMATION
Absolute Maximum Ratings
(Note 1)
SYMBOL PARAMETER Value UNITS
V
DD
T
STORE
T
A
T
J
Supply Voltage 16 V
Storage Temperature Range
Operating Free-air Temperature Range
Junction Temperature
-40
-40
°
to 150°
to 85°
°
150
°
C
C
C
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
Operating Conditions
SYMBOL PARAMETER MIN. TYP. MAX. UNITS
V
DD
V
IH
V
IL
Note 2: Recommended Operating Conditions indicate conditions for which the device is functional.
See Electrical Characteristics for guaranteed specific performance limits.
Supply Voltage 8.5 13.5 14.6 V
High-level Input Voltage (MUTE, SLEEP) 3.5 V
Low-level Input Voltage (MUTE, SLEEP) 1 V
(Note 2)
Thermal Characteristics
SYMBOL PARAMETER Value UNITS
θ
JC
θ
JA
Junction-to-case Thermal Resistance
Junction-to-ambient Thermal Resistance
3.5
15
°
°
C/W
C/W
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TECHNICAL INFORMATION
Electrical Characteristics
(Note 1, 2)
See Test/Application Circuit. Unless otherwise specified, VDD = 13.5V, f = 1kHz, Measurement
Bandwidth = 22kHz, R
= 4Ω, TA = 25 °C.
L
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNITS
P
O
I
DD,MUTE
I
DD, SLEEP
I
q
THD + N Total Harmonic Distortion Plus
IHF-IM IHF Intermodulation Distortion 19kHz, 20kHz, 1:1 (IHF) 0.18 %
SNR Signal-to-Noise Ratio
CS Channel Separation
PSRR Power Supply Rejection Ratio Vripple = 100mV 60 80 dB
η
V
OFFSET
VOH High-level output voltage
VOL Low-level output voltage
e
OUT
Output Power
(Continuous Average/Channel)
Mute Supply Current MUTE = VIH 5.5 7 mA
Sleep Supply Current SLEEP = VIH 0.25 2 mA
Quiescent Current VIN = 0 V 60 mA
Noise
Power Efficiency
Output Offset Voltage No Load, MUTE = Logic low 50 150 mV
(FAULT & OVERLOADB)
(FAULT & OVERLOADB)
Output Noise Voltage A-Weighted, input AC grounded 100
THD+N = 0.1% R
R
THD+N = 10% R
R
PO = 10W/Channel 0.03 %
A-Weighted, P
0dBr = 1W, R
= 12W/Channel, RL = 8Ω
P
OUT
3.5 V
1 V
L
= 4Ω
L
= 8Ω
L
= 4Ω
L
= 8Ω
L
= 1W, RL = 8Ω
OUT
= 4Ω, f = kHz
13
8
22
12
89 dB
74 80 dB
88 %
W
W
W
W
V
µ
Notes:
1) Minimum and maximum limits are guaranteed but may not be 100% tested.
2) 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.
TA2020-020, Rev. 4.0, 09.00 3 of 13
TECHNICAL INFORMATION
Pin Description
Pin
Function
2, 8 V5D, V5A Digital 5VDC, Analog 5VDC
3, 7,
16
AGND1, AGND2,
AGND3
4 REF Internal reference voltage; approximately 1.0VDC
6 OVERLOADB A logic low output indicates the input signal has overloaded the amplifier.
9, 12 VP1, VP2 Input stage output pins
10, 13 IN1, IN2 Single-ended inputs. Inputs are a “virtual” ground of an inverting opamp with
11 MUTE When set to logic high, both amplifiers are muted and in idle mode. W hen low
14 BIASCAP Input stage bias voltage (approximately 2.4VDC).
17 SLEEP When set to logic high, device goes into low power mode. If not used this pin
18 FAULT A logic high output indicates thermal overload, or an output is shorted to ground,
19, 28 PGND2, PGND1 Power Ground (high current)
20 DGND Digital Ground
21, 23,
26, 24
OUTP2 & OUTM2;
OUTP1 & OUTM1
22, 25 VDD2, VDD1 Supply pin for high current H-bridges, nominally 13.5VDC.
1, 5, 15 NC Not connected
27 VDDA Analog 13.5VDC
29 CPUMP Charge pump output (nominally 10V above VDDA)
30 5VGEN Regulated 5VDC source used to supply power to the input section (pins 2 & 8).
31, 32 DCAP2, DCAP1 Charge pump switching pins. DCAP1 (pin 32) is a free running 300kHz square
Description
Analog Ground
approximately 2.4VDC bias.
(grounded), both amplifiers are fully operational. If left floating, the device stays in
the mute mode. Ground if not used.
should be grounded.
or another output.
Bridged outputs
wave between VDDA and DGND (13.5Vpp nominal). DCAP2 (pin 31) is level
shifted 10 volts above DCAP1 (pin 32) with the same amplitude (13.5Vpp
nominal), frequency, and phase as DCAP1.
AGND1
OVERLOADB
AGND2
BIASCAP
AGND3
PGND2
OUTP2
OUTM2
OUTM1
OUTP1
PGND1
CPUMP
5VGEN
DCAP2
DCAP1
V5D
REF
V5A
VP1
MUTE
VP2
SLEEP
FAULT
DGND
VDD2
VDD1
VDDA
32-pin SSIP Package
NC
NC
IN1
IN2
NC
(Front View)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
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