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TI-TPA0112.pdf
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TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Compatible With PC 99 Desktop Line-Out
Into 10-kΩ Load
D
Internal Gain Control, Which Eliminates
External Gain-Setting Resistors
D
2-W/Ch Output Power Into 3-Ω Load
D
PC-Beep Input
D
Depop Circuitry
D
Stereo Input MUX
D
Fully Differential Input
D
Low Supply Current and Shutdown Current
D
Surface-Mount Power Packaging
24-Pin TSSOP PowerPAD
description
The TPA0112 is a stereo audio power amplifier in a 24-pin TSSOP thermally enhanced package capable of
delivering 2 W of continuous RMS power per channel into 3-Ω loads. This device minimizes the number of
external components needed, simplifying the design, and freeing up board space for other features. When
driving 1 W into 8-Ω speakers, the TPA0112 has less than 0.8% THD+N across its specified frequency range.
Included within this device is integrated depop circuitry that virtually eliminates transients that cause noise in
the speakers.
Amplifier gain is internally configured and controlled by way of two terminals (GAIN0 and GAIN1). BTL gain
settings of –2, –6, –12, and –24 V/V are provided, while SE gain is always configured as –1 V/V for headphone
drive. An internal input MUX allows two sets of stereo inputs to the amplifier. In notebook applications, where
internal speakers are driven as BTL and the line outputs (often headphone drive) are required to be SE, the
TPA0112 automatically switches into SE mode when the SE/BTL
input is activated, and this reduces the gain
to –1 V/V.
The TPA0112 consumes only 6 mA of supply current during normal operation. A miserly shutdown mode
reduces the supply current to less than 150 µA.
The PowerPAD package (PWP) delivers a level of thermal performance that was previously achievable only
in TO-220-type packages. Thermal impedances of approximately 35°C/W are readily realized in multilayer PCB
applications. This allows the TPA0112 to operate at full power into 8-Ω loads at an ambient temperature of 85°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2000, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
PWP PACKAGE
(TOP VIEW)
GND
GAIN0
GAIN1
LOUT+
LLINEIN
LHPIN
PV
DD
RIN
LOUT–
LIN
BYPASS
GND
GND
RLINEIN
SHUTDOWN
ROUT+
RHPIN
V
DD
PV
DD
PCB ENABLE
ROUT–
SE/BTL
PC-BEEP
GND
PowerPAD is a trademark of Texas Instruments Incorporated.
TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
functional block diagram
ROUT+
–
+
–
+
R
MUX
PC-
Beep
Gain/
MUX
Control
Depop
Circuitry
Power
Management
–
+
–
+
L
MUX
RHPIN
RLINEIN
RIN
PC-BEEP
GAIN0
GAIN1
SE/BTL
LHPIN
LLINEIN
LIN
ROUT–
PV
DD
V
DD
BYPASS
SHUTDOWN
GND
LOUT+
LOUT–
PC ENABLE
TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
AVAILABLE OPTIONS
PACKAGED DEVICE
T
A
TSSOP
†
(PWP)
–40°C to 85°C TPA0112PWP
†
The PWP package is available taped and
reeled. To order a taped and reeled part, add
the suffix R to the part number (e.g.,
TPA0112PWPR).
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME NO.
I/O
DESCRIPTION
BYPASS 11 Tap to voltage divider for internal mid-supply bias generator
GAIN0 2 I Bit 0 of gain control
GAIN1 3 I Bit 1 of gain control
GND
1, 12,
13, 24
Ground connection for circuitry. Connected to the thermal pad.
LHPIN 6 I Left channel headphone input, selected when SE/BTL is held high
LIN 10 I Common left input for fully differential input. AC ground for single-ended inputs.
LLINEIN 5 I Left channel line input, selected when SE/BTL is held low
LOUT+ 4 O Left channel positive output in BTL mode and positive output in SE mode
LOUT– 9 O Left channel negative output in BTL mode and high-impedance in SE mode
PC-BEEP 14 I
The input for PC Beep mode. PC-BEEP is enabled when a > 1-V (peak-to-peak) square wave is input
to PC-BEEP or PCB ENABLE is high.
PCB ENABLE 17 I
If this terminal is high, the detection circuitry for PC-BEEP is overridden and passes PC-BEEP through
the amplifier, regardless of its amplitude. If PCB ENABLE is floating or low, the amplifier continues to
operate normally.
PV
DD
7, 18 I Power supply for output stage
RHPIN 20 I Right channel headphone input, selected when SE/BTL is held high
RIN 8 I Common right input for fully differential input. AC ground for single-ended inputs.
RLINEIN 23 I Right channel line input, selected when SE/BTL is held low
ROUT+ 21 O Right channel positive output in BTL mode and positive output in SE mode
ROUT– 16 O Right channel negative output in BTL mode and high-impedance in SE mode
SHUTDOWN 22 I Places entire IC in shutdown mode when held low, except PC-BEEP remains active
SE/BTL 15 I
Input MUX control input. When this terminal is held high, the LHPIN or RHPIN and SE output is selected.
When this terminal is held low, the LLINEIN or RLINEIN and BTL output are selected.
V
DD
19 I Analog V
DD
input supply. This terminal needs to be isolated from PV
DD
to achieve highest performance.
TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
DD
6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
–0.3 V to V
DD
+0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total power dissipation internally limited (see Dissipation Rating Table). . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
–40°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating junction temperature range, T
J
–40°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
DISSIPATION RATING TABLE
PACKAGE
T
A
≤ 25°C DERATING FACTOR T
A
= 70°C T
A
= 85°C
PWP 2.7 W
‡
21.8 mW/°C 1.7 W 1.4 W
‡
Please see the Texas Instruments document,
PowerPAD Thermally Enhanced Package Application Report
(literature number SLMA002), for more information on the PowerPAD package. The thermal data was
measured on a PCB layout based on the information in the section entitled
Texas Instruments Recommended
Board for PowerPAD
on page 33 of the before mentioned document.
recommended operating conditions
MIN MAX UNIT
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Supply voltage, V
DD
ÁÁÁ
ÁÁÁ
4.5
ÁÁÁ
ÁÁÁ
5.5
ÁÁÁ
ÁÁÁ
V
High level in
p
ut voltage V
IH
SE/BTL 4
V
High
-
le
v
el
inp
u
t
v
oltage
,
V
IH
SHUTDOWN 2
V
Low level in
p
ut voltage V
IL
SE/BTL 3
V
Lo
w-
le
v
el
inp
u
t
v
oltage
,
V
IL
SHUTDOWN 0.8
V
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Operating free-air temperature, T
A
ÁÁÁ
ÁÁÁ
–40
ÁÁÁ
ÁÁÁ
85
ÁÁÁ
ÁÁÁ
°C
electrical characteristics at specified free-air temperature, V
DD
= 5 V, T
A
= 25°C (unless otherwise
noted)
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
ÁÁÁÁ
ÁÁÁÁ
|V
OO
|
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Output offset voltage (measured differentially)
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
V
I
= 0, A
V
= 2
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
25
ÁÁÁ
ÁÁÁ
mV
ÁÁÁÁ
ÁÁÁÁ
PSRR
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Power supply rejection ratio
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
V
DD
= 4 V to 5 V
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
77
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
dB
|I
IH
| High-level input current
V
DD
= 5.5 V,
V
I
= V
DD
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
900
ÁÁÁ
Á
Á
Á
ÁÁÁ
nA
|I
IL
| Low-level input current
V
DD
= 5.5 V,
V
I
= 0 V
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
900
ÁÁÁ
ÁÁÁ
nA
ÁÁÁÁ
ÁÁÁÁ
I
DD
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Su
pp
ly current
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
6
ÁÁÁ
ÁÁÁ
8
ÁÁÁ
ÁÁÁ
mA
ÁÁÁÁ
ÁÁÁÁ
I
DD
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
S
u
ppl
y
c
u
rrent
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
SE mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
3
ÁÁÁ
ÁÁÁ
4
ÁÁÁ
ÁÁÁ
mA
ÁÁÁÁ
ÁÁÁÁ
I
DD(SD)
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Supply current, shutdown mode
ÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
150
ÁÁÁ
ÁÁÁ
300
ÁÁÁ
ÁÁÁ
µA
TPA0112
2-W STEREO AUDIO POWER AMPLIFIER
WITH FOUR SELECTABLE GAIN SETTINGS
SLOS204B – MAY 1999 – REVISED MARCH 2000
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
operating characteristics, V
DD
= 5 V, T
A
= 25°C, R
L
= 8 Ω, Gain = –2 V/V, BTL mode
PARAMETER TEST CONDITIONS
MIN TYP MAX UNIT
ÁÁÁÁ
Á
ÁÁ
Á
ÁÁÁÁ
P
O
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
Á
ÁÁÁÁÁÁÁÁÁÁÁÁ
Output power
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
THD = 1%,
R
L
= 4 Ω
ÁÁÁÁÁÁ
Á
ÁÁÁÁ
Á
ÁÁÁÁÁÁ
f = 1 kHz,
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
1.9
ÁÁÁ
Á
Á
Á
ÁÁÁ
ÁÁÁ
Á
Á
Á
ÁÁÁ
W
ÁÁÁÁ
ÁÁÁÁ
THD + N
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Total harmonic distortion plus noise
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
P
O
= 1 W,
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
f = 20 Hz to 15 kHz
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
0.75%
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁÁ
ÁÁÁÁ
B
OM
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Maximum output power bandwidth
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
THD = 5%
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
>15
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
kHz
ÁÁÁÁ
ÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Supply ripple rejection ratio
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
f = 1 kHz,
C
B
= 0.47 µF
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
68
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
dB
SNR Signal-to-noise ratio 105 dB
ÁÁÁÁ
ÁÁÁÁ
V
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Noise out
p
ut voltage
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
C
B
= 0.47
µ
F,
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
BTL mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
16
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
µV
RMS
ÁÁÁÁ
ÁÁÁÁ
V
n
ÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁ
Noise
o
u
tp
u
t
v
oltage
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
B
µ ,
f = 20 Hz to 20 kHz
ÁÁÁÁÁÁ
ÁÁÁÁÁÁ
SE mode
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
30
ÁÁÁ
ÁÁÁ
ÁÁÁ
ÁÁÁ
µ
V
RMS
Z
I
Input impedance See Table 1
TYPICAL CHARACTERISTICS
Table of Graphs
FIGURE
vs Output power
1, 4–7, 10–13,
16–19, 21
THD+N Total harmonic distortion plus noise
vs Frequency
2, 3, 8, 9, 14,
15, 20, 22
vs Output voltage 23
V
n
Output noise voltage vs Bandwidth 24
Supply ripple rejection ratio vs Frequency 25, 26
Crosstalk vs Frequency 27–29
Shutdown attenuation vs Frequency 30
SNR Signal-to-noise ratio vs Frequency 31
Closed loop respone 32–35
P
O
Output power vs Load resistance 36, 37
P
D
Power dissi
p
ation
vs Output power 38, 39
P
D
Po
w
er
dissipation
vs Ambient temperature 40
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