ST TS2012FC User Manual
TS2012FC
Filter-free flip-chip stereo 2 x 2.5 W class D audio power amplifer
Features
■ Operates from V
■ Dedicated standby mode active low for each
= 2.5 to 5.5 V
CC
channel
■ Output power per channel: 1.15 W at 5 V or
0.63 W at 3.6 V into 8 Ω with 1% THD+N max.
■ Output power per channel: 1.85 W at 5 V into
4 Ω with 1% THD+N max.
■ Output short-circuit protection
■ Four gain setting steps: 6, 12, 18, 24 dB
■ Low current consumption
■ PSSR: 63 dB typ at 217 Hz.
■ Fast startup phase: 7.8 ms
■ Thermal shutdown protection
■ Flip-chip 16-bump lead-free package
LOUT-
LOUT-
LOUT+
LOUT+
Flip chip 16 bumps
Pin connections (top view)
STDBYL
PVCC
PVCC
STDBYL
STDBYR
STDBYR
G1
G1
G1
G1
PGND
PGND
AGND
AGND
G0
G0
ROUT-
ROUT-
ROUT+
ROUT+
AVCC
AVCC
Applications
■ Cellular phones
■ PDA
Description
The TS2012 is a fully-differential stereo class D
power amplifier able to drive up to 1.15 W into an
8 Ω load at 5 V per channel. It achieves better
efficiency compared to typical class AB audio
amps.
The device has four different gain settings utilizing
two digital pins: G0 and G1.
Pop and click reduction circuitry provides low
on/off switch noise while allowing the device to
start within 8 ms.
Two standby pins (active low) allow each channel
to be switched off separately.
The TS2012 is available in a flip-chip 16-bump
lead-free package.
LIN+
LIN+
INL+
INL+
LIN- RIN-
LIN- RIN-
RIN+
RIN+
March 2009 Rev 4 1/33
www.st.com
33
Contents TS2012FC
Contents
1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3
2 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Electrical characteristics tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Electrical characteristic curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1 Differential configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2 Gain settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3 Common mode feedback loop limitations . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.4 Low frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.6 Wake-up time (t
4.7 Consumption in shutdown mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.8 Single-ended input configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.9 Output filter considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.10 Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.11 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
) and shutdown time (t
WU
) . . . . . . . . . . . . . . . . . . . . 23
STBY
5 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
6 Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
2/33
TS2012FC Absolute maximum ratings and operating conditions
1 Absolute maximum ratings and operating conditions
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
(2)
(1)
(6)
(5)
(7)
(3)
6V
GND to V
CC
V
200 °C/W
(4)
2kV
200 V
GND to V
CC
V
V
T
T
R
V
oper
P
Supply voltage
CC
Input voltage
in
Operating free air temperature range -40 to + 85 °C
Storage temperature -65 to +150 °C
stg
T
Maximum junction temperature 150 °C
j
Thermal resistance junction to ambient
thja
Power dissipation Internally limited
d
HBM: human body model
ESD
MM: machine model
Latch-up Latch-up immunity 200 mA
V
STBY
Standby pin maximum voltage
Lead temperature (soldering, 10sec) 260 °C
Output short circuit protection
1. All voltage values are measured with respect to the ground pin.
2. The magnitude of the input signal must never exceed VCC + 0.3 V / GND - 0.3 V.
3. The device is protected in case of over temperature by a thermal shutdown active at 150°C.
4. Exceeding the power derating curves during a long period will cause abnormal operation.
5. Human body model: 100 pF discharged through a 1.5 kΩ resistor between two pins of the device, done for
all couples of pin combinations with other pins floating.
6. Machine model: a 200 pF cap is charged to the specified voltage, then discharged directly between two
pins of the device with no external series resistor (internal resistor < 5 Ω), done for all couples of pin
combinations with other pins floating.
7. Implemented short-circuit protection protects the amplifier against damage by short-circuit between
positive and negative outputs of each channel and between outputs and ground.
3/33
Absolute maximum ratings and operating conditions TS2012FC
Table 2. Operating conditions
Symbol Parameter Value Unit
V
CC
V
V
V
STBY
R
V
V
R
thja
1. I Voo I ≤ 40 mV max with all differential gains except 24 dB. For 24 dB gain, input decoupling capacitors are
mandatory.
2. Without any signal on standby pin, the device is in standby (internal 300 kΩ +/-20% pull-down resistor).
3. Minimum current consumption is obtained when V
4. Between G0, G1pins and GND, there is an internal 300 kΩ (+/-20%) pull-down resistor. When pins are
floating, the gain is 6 dB. In full standby (left and right channels OFF), these resistors are disconnected
(HiZ input).
5. With a 4-layer PCB.
Supply voltage 2.5 to 5.5 V
Input voltage range GND to V
in
(2)
(3)
(1)
(4)
STBY
(5)
= GND.
GND+0.5V to VCC-0.9V V
1.4 ≤ V
GND
≤ V
STBY
STBY
1.4 ≤ VIH ≤ VCC
≤ VIL ≤ 0.4
GND
90 °C/W
Input common mode voltage
ic
Standby voltage input
Device ON
Device in STANDBY
Load resistor ≥ 4 Ω
L
GO, G1 - high level input voltage
IH
GO, G1 - low level input voltage
IL
Thermal resistance junction to ambient
CC
≤ VCC
≤ 0.4
V
V
V
V
4/33
TS2012FC Typical application
2 Typical application
Figure 1. Typical application schematics
Differential
Left Input
Left IN+
Left IN-
Differential
Rig ht Inpu t
Right IN+
Right IN-
Differential
Left Input
Left IN+
Left IN-
Input capacitors
are optional
Cin
Cin
Cin
Cin
Input capacitors
are optional
Cin
Cin
Gain Select
Control
TS20 12
Lin+
A1
Lin-
B1
G0
C2
G1
B2
Rin+
D1
Rin-
C1
STBYL
B4
STBYR
B3
Standby Control
Gain Select
Control
TS20 12
Lin+
A1
Lin-
B1
Gain
Select
Gain
Select
Gain
Select
Standby
Control
D2
AVCC
C3
D2
AVCC
PWM
Oscil lator
PWM
Protection
Circuit
PWM
Cs2
0.1uF
Cs2
0.1uF
PVCC
H
Bridge
H
Bridge
PGNDAGND
PVCC
H
Bridge
VCC
VCC
Cs1
1uF
A2
Lout+
A3
LC Output Filter
Left sp eak er
Righ t speaker
Load
A4
Lout-
Rout+
D3
Rout-
D4
C4
Cs1
1uF
A2
Lout+
A3
A4
Lout-
Differential
Rig ht Inpu t
Right IN+
Right IN-
G0
C2
C3
Oscil lator
PWM
Protection
Circuit
H
Bridge
PGNDAGND
Rout+
Rout-
C4
D3
D4
Ω
4 LC Output Filter
μ
15 H
μ
2 F
μ
2 F
μ
15 H
LC Output Filter Load
Ω
8 LC Output Filter
μ
30 H
μ
1 F
μ
1 F
μ
30 H
G1
B2
Rin+
D1
Cin
Cin
C1
B4
B3
Gain
Select
Rin-
STBYL
STBYR
Standby Control
Standby
Control
5/33
Typical application TS2012FC
Table 3. External component descriptions
Components Functional description
C
, C
S1
C
in
Table 4. Pin descriptions
Pin number Pin name Pin description
A1 Lin+ Left channel positive differential input
A2 PVCC Power supply voltage
A3 Lout+ Left channel positive output
A4 Lout- Left channel negative output
B1 Lin- Left channel negative differential input
B2 G1 Gain select pin (MSB)
B3 STBYR Standby pin (active low) for right channel output
B4 STBYL Standby pin (active low) for left channel output
C1 Rin- Right channel negative differential input
C2 G0 Gain select pin (LSB)
Supply capacitor that provides power supply filtering.
S2
Input coupling capacitors (optional) that block the DC voltage at the amplifier input
terminal. The capacitors also form a high pass filter with Zin
= 1 / (2 x π x Zin x Cin)). Be aware that value of Z
(F
cl
is changing with gain setting.
in
C3 AGND Analog ground
C4 PGND Power ground
D1 Rin+ Right channel positive differential input
D2 AVCC Analog supply voltage
D3 Rout+ Right channel positive output
D4 Rout- Right channel negative output
6/33
TS2012FC Electrical characteristics
3 Electrical characteristics
3.1 Electrical characteristics tables
Table 5. VCC = +5 V, GND = 0 V, Vic=2.5V, T
amb
= 25° C
(unless otherwise specified)
Symbol Parameters and test conditions Min. Typ. Max. Unit
I
CC
I
STBY
V
oo
P
THD + N
Efficiency
PSRR
Crosstalk
CMRR
Gain
Supply current
No input signal, no load, both channels
Standby current
No input signal, V
STBY
= GND
Output offset voltage
Floating inputs, G = 6 dB, RL = 8 Ω
Output power
THD + N = 1% max, f = 1 kHz, R
o
THD + N = 1% max, f = 1 kHz, RL = 8 Ω
THD + N = 10% max, f = 1 kHz, RL = 4 Ω
THD + N = 10% max, f = 1 kHz, R
Total harmonic distortion + noise
= 0.8 W, G = 6 dB, f =1 kHz, RL = 8 Ω
P
o
Efficiency per channel
= 1.85 W, RL = 4 Ω +15µH
P
o
Po = 1.16 W, RL = 8 Ω +15µH
Power supply rejection ratio with inputs grounded
C
V
in
ripple
=1µF
,f = 217 Hz, RL = 8 Ω, Gain = 6 dB,
= 200 mV
pp
(1)
Channel separation
= 0.9 W, G = 6 dB, f =1 kHz, RL = 8 Ω
P
o
Common mode rejection ratio
C
= 1 µF, f = 217 Hz, RL = 8 Ω, Gain = 6 dB,
in
= 200 mV
Δ
VICM
pp
Gain value with no load
G1 = G0 = V
IL
G1 = VIL and G0 = VIH
G1 = VIH and G0 = V
IL
G1 = G0 = VIH
= 4 Ω
L
= 8 Ω
L
5.5
11.5
17.5
23.5
57mA
12µA
25 mV
1.85
1.15
2.5
1.6
0.5 %
78
88
65 dB
90 dB
63 dB
6
12
18
24
6.5
12.5
18.5
24.5
W
%
dB
Single-ended input impedance
Referred to ground
Z
in
Gain = 6 dB
Gain = 12 dB
Gain = 18 dB
Gain = 24 dB
F
Pulse width modulator base frequency 190 280 370 kHz
PWM
24
24
12
30
30
15
6
7.5
7/33
36
36
18
kΩ
9
Electrical characteristics TS2012FC
Table 5. VCC = +5 V, GND = 0 V, Vic=2.5V, T
amb
= 25° C
(unless otherwise specified) (continued)
Symbol Parameters and test conditions Min. Typ. Max. Unit
SNR
t
WU
t
STBY
V
N
1. Dynamic measurements - 20*log(rms(V
2. See Section 4.6: Wake-up time (t
Signal to noise ratio (A-weighting)
Po = 1.1 W, G = 6 dB, RL =8Ω
Total wake-up time
Standby time
(2)
(2)
Output voltage noise f = 20 Hz to 20 kHz, RL=8Ω
Unweighted (filterless, G = 6 dB)
A-weighted (filterless, G = 6 dB)
Unweighted (with LC output filter, G = 6 dB)
A-weighted (with LC output filter, G = 6 dB)
Unweighted (filterless, G = 24 dB)
A-weighted (filterless, G = 24 dB)
Unweighted (with LC output filter, G = 24 dB)
A-weighted (with LC output filter, G = 24 dB)
)/rms(V
out
) and shutdown time (t
WU
ripple
)). V
is the superimposed sinus signal to VCC at f = 217 Hz.
ripple
) on page 23.
STBY
99 dB
9 13 16.5 ms
11 15.8 20 ms
61
31
59
31
87
52
87
53
µV
RMS
8/33
TS2012FC Electrical characteristics
Table 6. VCC = +3.6 V, GND = 0 V, Vic=1.8V, T
amb
= 25° C
(unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
I
CC
I
STBY
V
oo
P
THD + N
Efficiency
PSRR
Crosstalk
CMRR
Gain
Supply current
No input signal, no load, both channels
Standby current
No input signal, V
STBY
= GND
Output offset voltage
Floating inputs, G = 6 dB, RL = 8 Ω
Output power
THD + N = 1% max, f = 1 kHz, RL = 4 Ω
o
THD + N = 1% max, f = 1 kHz, R
THD + N = 10% max, f = 1 kHz, RL = 4 Ω
THD + N = 10% max, f = 1 kHz, RL = 8 Ω
Total harmonic distortion + noise
= 0.45 W, G = 6 dB, f = 1 kHz, RL = 8 Ω
P
o
Efficiency per channel
= 0.96 W, RL = 4 Ω +15µH
P
o
Po = 0.63 W, RL = 8 Ω +15µH
Power supply rejection ratio with inputs grounded
C
V
in
ripple
=1µF
,f = 217 Hz, RL = 8 Ω, Gain = 6 dB,
= 200 mV
pp
(1)
Channel separation
G = 6 dB, f = 1 kHz, R
= 8 Ω
L
Common mode rejection ratio
C
= 1 µF, f = 217 Hz, RL = 8 Ω, Gain = 6 dB,
in
Δ
= 200 mV
VICM
pp
Gain value with no load
G1 = G0 = V
IL
G1 = VIL and G0 = VIH
G1 = V
and G0 = V
IH
IL
G1 = G0 = VIH
= 8 Ω
L
5.5
11.5
17.5
23.5
3.5 5.5 mA
0.7 2 µA
25 mV
0.96
0.63
1.3
0.8
0.35 %
78
88
65 dB
90
62 dB
6
12
18
24
6.5
12.5
18.5
24.5
W
%
dB
Single-ended input impedance
Referred to ground
Z
in
Gain = 6 dB
Gain = 12 dB
Gain = 18 dB
Gain = 24 dB
F
Pulse width modulator base frequency 190 280 370 kHz
PWM
SNR
t
WU
t
STBY
Signal-to-noise ratio (A-weighting)
P
= 0.6 W, G = 6 dB, RL = 8 Ω
o
Total wake-up time
Standby time
(2)
(2)
24
24
12
6
30
30
15
7.5
96 dB
7.5 11.3 15 ms
10 13.8 18 ms
9/33
36
36
18
kΩ
9
Electrical characteristics TS2012FC
Table 6. VCC = +3.6 V, GND = 0 V, Vic=1.8V, T
amb
= 25° C
(unless otherwise specified) (continued)
Symbol Parameter Min. Typ. Max. Unit
Output voltage noise f = 20 Hz to 20 kHz, RL=8Ω
Unweighted (filterless, G = 6 dB)
A-weighted (filterless, G = 6 dB)
Unweighted (with LC output filter, G = 6 dB)
V
N
A-weighted (with LC output filter, G = 6 dB)
Unweighted (filterless, G = 24 dB)
A-weighted (filterless, G = 24 dB)
Unweighted (with LC output filter, G = 24 dB)
A-weighted (with LC output filter, G = 24 dB)
1. Dynamic measurements - 20*log(rms(V
2. See Section 4.6: Wake-up time (t
) and shutdown time (t
WU
)/rms(V
out
ripple
)). V
is the superimposed sinus signal to VCC at f = 217 Hz.
ripple
) on page 23.
STBY
54
28
52
27
80
50
79
49
µV
RMS
10/33
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