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
1
EB-TA2022 Rev. 1.0/03.02
EB-TA2022
CLASS-T DIGITAL AUDIO AMPLIFIER 2 CHANNEL TA2022
EVALUATION BOARD
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 . 0 M a r c h 2 0 0 2
G E N E R A L D E S C R I P T I O N
T h e E B - T A 2 0 2 2 V e r s i o n 4 . 0 i s a s t e r e o 1 0 0 W p e r c h a n n e l a u d i o a m p l i f i e r
d e s i g n e d t o p r o v i d e a s i m p l e a n d s t r a i g h t f o r w a r d e n v i r o n m e n t f o r t h e e v a l u a t i o n
o f t h e T A 2 0 2 2 a m p l i f i e r . T h i s e v a l u a t i o n b o a r d i n c l u d e s a c i r c u i t t h a t w i l l
a u t o m a t i c a l l y t r i m a n y D C o f f s e t a t t h e o u t p u t a n d a r e l a y . F o r a d d i t i o n a l
d o c u m e n t a t i o n o n t h e T A 2 0 2 2 , s e e t h e T A 2 0 2 2 D a t a S h e e t .
A P P L I C A T I O N S
Mini/Micro Component Systems
Home Theater Receivers
Car stereo head units & trunk amplifiers
Powered DVD Systems
B E N E F I T S
More power per cubic inch for 100W per
channel design
Simplifies thermal management
Signal Quality comparable to linear
amplifiers
Simple building block for multi-channel
design
F E A T U R E S
High Power: 100W @ 4
, 1.0% THD+N
Low Noise Floor: 150uV A-weighted
Low Distortion: .02% THD+N @ 75W, 4
High Efficiency: 92% for 8
loads
87% for 4
loads
Dynamic Range = 102dB
Over-Current Protection
Over and Under Voltage Protection
Over Temperature Protection
Single Ended Outputs
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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EB-TA2022 Rev. 1.0/03.02
O P E R A T I N G I N S T R U C T I O N S
B O A R D C O N N E C T I O N D I A G R A M
Audio Source
OUT2
AGND
OUT1
+
-
TA2022
V+ Pgnd V- Vo2 GND2 GND1 Vo1
AGND 5V IN1 AGND IN2
5V
+
+
-
-
J2
J3
Speaker Right
Speaker Left
A
W
A
K
E M
U
TE
J1
+
+ -
-
VNN
VPP
Pgnd
Three external power supplies are required to operate the EB-TA2022: VPP, VNN (referenced to
Pgnd), and 5V (referenced to Agnd). The VPP and VNN form a split rail supply referenced to Pgnd.
The 5V ground (Agnd) must be kept separate from the VPP and VNN ground (Pgnd). Agnd and Pgnd
are joined at a common point on the EB-TA2022 near headers J2 and J3.
Minimum and Maximum supply voltages are +/-20V and +/-36V, respectively, depending on the load
impedance. It is not recommended that the EB-TA2022 be operated above +/-31V when driving 4
loads, single ended, as the internal current limit circuit may activate, causing the amplifier to mute.
The VPP and VNN power supply connection, J3, is through a 7-Pin 0.156" spaced header. The
female terminal housing for this header is Molex 09-50-8071. Please see TABLE 2 for header
connections.
The 5V power supply connection, J2, is through a 5-Pin 0.100" spaced header. The female terminal
housing for this header is Molex 22-01-2057. Please see TABLE 1 for header connections.
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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EB-TA2022 Rev. 1.0/03.02
TABLE 1
TABLE 2
OUTPUT
The output connection for each channel of the EB-TA2022 is made at pins 1 4 of header J3. The
output of the TA2022 is single-ended, therefore each output has a positive output (Vo1 and Vo2) and
a ground (GND1 and GND2).
I N P U T
The input connection for each channel of the EB-TA2022 is made at pins 3 5 of header J2. The left
and right inputs should be connected to IN1 (pin3) and IN2 (pin5). These inputs share a common
ground referenced to Agnd (pin4).
JUMPER SETTINGS
There is a 3-pin header for the MUTE control of the TA2022. With the jumper placed in the AWAKE
position the part is un-muted by grounding (AGND) the mute pin. When the jumper is placed in the
MUTE position the mute pin is pulled high (5V) and the amplifier is muted.
OUTPUT OFFSET NULL AND RELAY
There is an automatic offset trim circuit for each channel using an LM358 op-amp. Once the LM358
trims any DC to 0Vdc a comparator allows a relay to close.
GAIN SETTING
The gain of the EB_TA2022 Version 4.0 is set to 18V/V. The gain of the TA2022 is the product of the
input stage and the modulator stage. The input stage gain is set to unity. Before changing the gain of
the TA2022, please refer to the TA2022 Amplifier Gain section of the TA2022 Data Sheet.
J 3 C o n n e c t o r P i n # C o n n e c t i o n
P i n 1 V o 1
P i n 2 G N D 1
P i n 3 G N D 2
P i n 4 V o 2
P i n 5 V N N
P i n 6 P g n d
P i n 7 V P P
J 2 C o n n e c t o r P i n # C o n n e c t i o n
P i n 1 A g n d
P i n 2 5 V
P i n 3 I N 1
P i n 4 A g n d
P i n 5 I N 2
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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EB-TA2022 Rev. 1.0/03.02
Performing Measurements on the EB-TA2022 Version 4.0
The TA2022 operates by generating a high frequency switching signal based on the audio input.
This
signal is sent through a low-pass filter that recovers an amplified version of the audio input
.
The
frequency of the switching pattern is spread spectrum in nature and typically varies between 100kHz
and 1MHz, which is well above the 20Hz 20kHz audio band. The pattern itself does not alter or
distort the audio input signal, but it does introduce some inaudible components.
The measurements of certain performance parameters, particularly noise related specifications such
as THD+N, are significantly affected by the design of the low-pass filter used on the output as well as
the bandwidth setting of the measurement instrument used. Unless the filter has a very sharp roll-off
just beyond the audio band or the bandwidth of the measurement instrument is limited, some of the
inaudible noise components introduced by the TA2022 amplifier switching pattern will degrade the
measurement by including out of band (audio) energy.
One feature of the TA2022 is that it does not require large multi-pole filters to achieve excellent
performance in listening tests, usually a more critical factor than performance measurements.
Though using a multi-pole filter may remove high-frequency noise and improve THD+N type
measurements (when they are made with wide-bandwidth measuring equipment), these same filters
degrade frequency response. The EB-TA2022 has a simple two-pole output filter with excellent
performance in listening tests.
(See Application Note 4 for additional information on bench testing)
C o n t a c t I n f o r m a t i o n
T R I P A T H T E C H N O L O G Y , I N C
2560 Orchard Parkway, San Jose, CA 95131
408.750.3000 - P
408.750.3001 - F
For more Sales Information, please visit us @
www.tripath.com/cont_s.htm
For more Technical Information, please visit us @
www.tripath.com/data.htm
EB-TA2022 Revised: 3/18/2001 JR.
Revision: Ver4.0
Bill Of Materials
Item
Quantity
Reference
Part
Digikey Part #
Manufacturers Part# (Package)
________________________________________________________________________________________________________________
1
10
C33,C41,C42,C43,C48,
0.1uF;50V
PCC1864CT-ND
Panasonic ECJ-2VF1H104Z (SMT 0805)
C49,C3,C8,C9,C10
2
2
C44,C45
0.1uF;100V
AVX-12061C104KAT2A (SMT 1206)
3
1
C47
390pF;50V
PCC391CGCT-ND
PANASONIC ECJ-2VC1H391J(SMT 0805)
4
1
C46
330pF;50V
PCC331CGCT-ND
PANASONIC ECJ-2VC1H331J(SMT 0805)
5
2
C35,C36,C4,C6
3.3uF;25V
P6626-ND
Panasonic ECE-A25Z3R3(Thru-Hole)
6
4
C37,C38,C39,C40
0.22uF;50V
P4667-ND
Panasonic ECQ-V1H224JL(Thru-Hole)
7
2
C29,C32
220uF;50V
P10326-ND
Panasonic EEU-FC1H221S(Thru-Hole)
8
1
C34
100uF;35V
P5165-ND
Panasonic ECA-1VM101(Thru-Hole)
9
2
C27,C28
47uF;16V
P810-ND
Panasonic ECE-A1CKA470(Thru-Hole)
10
1
C5
22uF, 10V
P960-ND
Panasonic ECE-A1AKS220(Thru-Hole)
11
3
D1,D8,D9
B1100/B
B1100DICT-ND
Diodes Inccorporated (SMA)
12 4
D5,D11,D12,D13
MURS120T3
MURS120T3 (SMT SMB)
13
1
D4
1N5243
1N5243BDICT-ND
13V, 500mW, DO-35
14
1
D2
1N5235
1N5235BDICT-ND
6.8V, 500mW, DO-35
15
1
D3
1N4148
1N4148DICT-ND
DO-35
16
1
D6
LED
17
1
J3
7-pin,0.156" header
WM4605-ND
Molex 26-48-1075
18
1
J2
5-pin,0.100" header
WM4203-ND
Molex 22-23-2051
19
1
J1
3-pin,0.100" header
WM4001-ND
Molex 22-03-2031
20
2
J9,J10
Screw Terminal
8190K-ND
Keystone 8190
21
1
L4
100uH
TK4300-ND
JWMiller 6000-101k or Toko 187LY-101J
22
2
L5,L6
11uH
American Cores AW-690-06-44T-22-V*see note
1
23
2
R47,R48
249
(SMT 0805)
24
1
R16
300
(SMT 0805)
25
5
R30,R33,R34,R35,R50
1K
(SMT 0805)
26
4
R36,R38,R39,R40
1.2K
(SMT 0805)
27
2
R1,R17
3K
(SMT 0805)
28
1
R42
8.2K
,1%
(SMT 0805)
29
4
R31,R37,R41,R52
9.1K
,1%
(SMT 0805)
30
2
R18,R19
10K
(SMT 0805)
31
1
R8
15K
(SMT 0805)
32
4
R32,R43,R44,R51
20K
, 1%
(SMT 0805)
33
1
R7
25K
(SMT 0805)
34
1
R9
35K
(SMT 0805)
35
5
R2,R10,R12,R14,R15
50K
(SMT 0805)
36
1
R5
80K
(SMT 0805)
37
3
R3,R11,R13
100K
(SMT 0805)
38
1
R4
200K
(SMT 0805)
39
3
R45,R46,R6
249K
,1%
(SMT 0805)
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