TS488
TS489
Pop-free 120 mW stereo headphone amplifier
Datasheet
−
production data
Features
■
■
■
■
TS488IST - MiniSO-8
OUT (1)
VIN (1)
BYPASS
GND
1
2
3
4
8
7
6
5
VCC
OUT (2)
VIN (2)
SHUTDOWN
Pop and click noise protection circuitry
Operating range from V
CC
= 2.2 V to 5.5 V
Standby mode active low (TS488) or high (TS489)
Output power:
– 120 mW at 5 V, into 16
Ω
with 0.1% THD+N max (1 kHz)
– 55 mW at 3.3 V, into 16
Ω
with 0.1% THD+N max (1 kHz)
Low current consumption: 2.7 mA max at 5 V
Ultra-low standby current consumption: 10 nA
typical
High signal-to-noise ratio
High crosstalk immunity: 102 dB (F = 1 kHz)
PSRR: 70 dB typ. (F = 1 kHz), inputs grounded
at 5 V
Unity-gain stable
Short-circuit protection circuitry
Available in lead-free MiniSO-8 & DFN8
2 mm x 2 mm
TS488IQT - DFN8
Vcc
OUT
(1)
V
IN (1)
Bypass
1
2
3
4
8
7
6
OUT
(2)
V
IN (2)
Shutdown
■
■
■
■
■
■
■
■
5
GND
Applications
■
Headphone amplifiers
■
Mobile phones, PDAs, computer motherboards
■
High-end TVs, portable audio players
Description
The TS488/9 is an enhancement of TS486/7 that
eliminates pop and click noise and reduces the
number of external passive components.
The TS488/9 is a dual audio power amplifier
capable of driving, in single-ended mode, either a
16
Ω
or a 32
Ω
stereo headset.
Capable of descending to low voltages, it delivers
up to 31 mW per channel (into 16
Ω
loads) of
continuous average power with 0.1% THD+N in
the audio bandwidth from a 2.5 V power supply.
An externally-controlled standby mode reduces
the supply current to 10 nA (typ.). The unity gain
stable TS488/9 is configured by external gain-
setting resistors.
May 2012
This is information on a product in full production.
Doc ID 11971 Rev 5
1/32
www.st.com
32
Contents
TS488-TS489
Contents
1
2
3
4
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Lower cutoff frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Higher cutoff frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
POP performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Connecting the headphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1
5.2
MiniSO-8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DFN8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6
7
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
2/32
Doc ID 11971 Rev 5
TS488-TS489
Typical application schematic
1
Typical application schematic
Figure 1.
Typical application for the TS488-TS489
TS488=stdby
TS489=stdby
Table 1.
Application component information
Functional description
Inverting input resistor that sets the closed loop gain in conjunction with R
feed
.
This resistor also forms a high pass filter with C
in
(F
c
=
1 / (2 x Pi x R
in
x C
in
)).
Input coupling capacitor that blocks the DC voltage at the amplifier’s input terminal.
Feedback resistor that sets the closed loop gain in conjunction with R
in
.
A
V
= Closed Loop Gain= -R
feed
/R
in
.
Supply output capacitor that provides power supply filtering.
Bypass capacitor that provides half supply filtering.
Output coupling capacitor that blocks the DC voltage at the load input terminal.
This capacitor also forms a high pass with R
L
(F
c
=
1 / (2 x Pi x R
L
x C
out
)).
Component
R
in1,2
C
in1,2
R
feed1,2
C
s
C
b
C
out1,2
Doc ID 11971 Rev 5
3/32
Absolute maximum ratings and operating conditions
TS488-TS489
2
Absolute maximum ratings and operating conditions
Table 2.
Symbol
V
CC
V
i
T
stg
T
j
R
thja
Supply voltage
(1)
Input voltage
Storage temperature
Maximum junction temperature
Thermal resistance junction-to-ambient
MiniSO-8
DFN8
Power dissipation
(2)
:
MiniSO-8
DFN8
Human body model (pin to pin)
Machine model
220 pF - 240 pF (pin to pin)
Latch-up immunity (all pins)
Lead temperature (soldering, 10 sec)
Output short-circuit to V
CC
or GND
1. All voltage values are measured with respect to the ground pin.
2. P
diss
is calculated with T
amb
= 25 °C, T
j
= 150 °C.
3. Attention must be paid to continuous power dissipation (V
DD
x 250 mA). Short-circuits can cause
excessive heating and destructive dissipation. Exposing the IC to a short-circuit for an extended period of
time will dramatically reduce the product’s life expectancy.
Absolute maximum ratings
Parameter
Value
6
-0.3 V to V
CC
+0.3 V
-65 to +150
150
215
70
0.58
1.79
2
200
200
250
continuous
(3)
Unit
V
V
°C
°C
°C/W
P
diss
ESD
ESD
Latch-up
W
kV
V
mA
°C
Table 3.
Symbol
V
CC
R
L
T
oper
C
L
Operating conditions
Parameter
Supply voltage
Load resistor
Operating free air temperature range
Load capacitor:
R
L
= 16 to 100
Ω
R
L
> 100
Ω
Standby voltage input:
TS488 active, TS489 in standby
TS488 in standby, TS489 active
Thermal resistance junction-to-ambient
MiniSO-8
DFN8
(2)
Value
2.2 to 5.5
≥
16
-40 to + 85
400
100
1.5
≤
V
≤
V
CC
GND
≤
V
STBY
≤
0.4
(1)
190
40
Unit
V
Ω
°C
pF
V
STBY
V
R
thja
°C/W
1. The minimum current consumption (I
STBY
) is guaranteed at GND (TS488) or V
CC
(TS489) for the whole
temperature range.
2. When mounted on a 4-layer PCB.
4/32
Doc ID 11971 Rev 5
TS488-TS489
Electrical characteristics
3
Table 4.
Symbol
I
CC
Electrical characteristics
Electrical characteristics at V
CC
= +5 V
with GND = 0 V, T
amb
= 25 °C (unless otherwise specified)
Parameter
Supply current
Conditions
No input signal, no load
No input signal, V
STBY
= GND for TS488,
R
L
= 32
Ω
No input signal, V
STBY
= V
CC
for TS489,
R
L
= 32
Ω
THD+N = 0.1% max, F = 1 kHz, R
L
= 32
Ω
P
out
Output power
THD+N = 1% max, F = 1 kHz, R
L
= 32
Ω
THD+N = 0.1% max, F = 1 kHz, R
L
= 16
Ω
THD+N = 1% max, F = 1 kHz, R
L
= 16
Ω
Total harmonic distortion
+ noise
A
V
=-1, R
L
= 32
Ω,
P
out
= 60 mW,
20 Hz
≤
F
≤
20 kHz
A
V
=-1, R
L
= 16
Ω,
P
out
= 90 mW,
20 Hz
≤
F
≤
20 kHz
A
V
=-1, R
L
≥
16
Ω,
C
b
=1 µF, F = 1 kHz,
V
ripple
= 200 mVpp
A
V
=-1, R
L
≥
16
Ω,
C
b
=1 µF, F = 217 Hz,
V
ripple
= 200 mVpp
V
OL
: R
L
= 32
Ω
V
O
Output swing
V
OH
: R
L
= 32
Ω
V
OL
: R
L
= 16
Ω
V
OH
: R
L
= 16
Ω
SNR
Signal-to-noise ratio
A-weighted, A
V
=-1, R
L
= 32
Ω,
THD+N < 0.4%, 20 Hz
≤
F
≤
20 kHz
R
L
= 32
Ω,
A
V
= -1
F = 1 kHz
F = 20 Hz to 20 kHz
4.18
4.53
64
62
100
70
Min.
Typ.
2
10
10
75
80
mW
120
130
0.3
%
0.3
70
dB
68
0.23
4.72
V
0.44
4.48
105
dB
0.57
0.31
Max.
2.7
1000
nA
1000
Unit
mA
I
STBY
Standby current
THD+N
PSRR
Power supply rejection
ratio, inputs grounded
(1)
Crosstalk Channel separation
C
i
GBP
SR
V
IO
t
wu
Input capacitance
Gain bandwidth product
Slew rate, unity gain
inverting
Input offset voltage
Wake-up time
-102
-84
1
dB
pF
MHz
V/μs
20
mV
ms
R
L
= 32
Ω
R
L
= 16
Ω
V
icm
=V
CC
/2
1.1
0.65
1
100
1. Guaranteed by design and evaluation.
Doc ID 11971 Rev 5
5/32
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