TS486
TS487
100mW STEREO HEADPHONE AMPLIFIER WITH STANDBY
MODE
s
OPERATING FROM Vcc=2V to 5.5V
s
STANDBY MODE
ACTIVE LOW (TS486) or
HIGH (TS487)
s
OUTPUT POWER: 102mW @5V, 38mW
@3.3V into 16Ω with 0.1% THD+N max (1kHz)
s
LOW CURRENT CONSUMPTION:
2.5mA max
s
High Signal-to-Noise ratio: 103dB(A) at 5V
s
High Crosstalk immunity: 83dB (F=1kHz)
s
PSRR: 58 dB (F=1kHz), inputs grounded
s
ON/OFF click reduction circuitry
s
Unity-Gain Stable
s
SHORT CIRCUIT LIMITATION
s
Available in SO8, MiniSO8 & DFN 3x3mm
DESCRIPTION
The TS486/7 is a dual audio power amplifier capa-
ble of driving, in single-ended mode, either a 16 or
a 32Ω stereo headset.
Capable of descending to low voltages, it delivers
up to 90mW per channel (into 16Ω loads) of con-
tinuous average power with 0.3% THD+N in the
audio bandwitdth from a 5V power supply.
An externally-controlled standby mode reduces
the supply current to 10nA (typ.). The unity gain
stable TS486/7 can be configured by external
gain-setting resistors or used in a fixed gain ver-
sion.
APPLICATIONS
s
Headphone Amplifier
s
Mobile phone, PDA, computer motherboard
s
High end TV, portable audio player
ORDER CODE
Part
Number
TS486
TS487
TS486
TS486-1
TS486-2
TS486-4
TS487
TS487-1
TS487-2
TS487-4
Temperature
Package
Range: I
D
•
•
•
tba
tba
tba
•
tba
tba
tba
•
tba
tba
tba
•
tba
tba
tba
S
Q
external TS486I
external TS487I
external K86A
x1/0dB
K86B
x2/6dB
K86C
x4/12dB K86D
external K87A
x1/0dB
K87B
x2/6dB
K87C
x4/12dB K87D
TS487-IQT,
TS487-1IQT, TS487-2IQT, TS487-4IQT: DFN8
Gain
Marking
TS486-IQT, TS486-1IQT, TS486-2IQT, TS486-4IQT:
DFN8
PIN CONNECTIONS
(top view)
TS486IDT: SO8, TS486IST, TS486-1IST,
TS486-2IST, TS486-4IST: MiniSO8
OUT (1)
VIN (1)
BYPASS
GND
1
2
3
4
8
7
6
5
VCC
OUT (2)
VIN (2)
SHUTDOWN
OUT
(1)
1
2
3
4
8
7
6
5
Vcc
OUT
(2)
V
IN (2)
SHUTDOWN
V
IN (1)
BYPASS
GND
TS487IDT: SO8, TS487IST, TS487-1IST,
TS487-2IST, TS487-4IST: MiniSO8
OUT (1)
VIN (1)
BYPASS
GND
1
2
3
4
8
7
6
5
VCC
OUT (2)
VIN (2)
SHUTDOWN
-40, +85°C
OUT
(1)
V
IN (1)
BYPASS
GND
1
2
3
4
8
7
6
5
Vcc
OUT
(2)
V
IN (2)
SHUTDOWN
MiniSO & DFN only available in Tape & Reel with T suffix,
SO is available in Tube (D) and in Tape & Reel (DT)
June 2003
1/31
TS486-TS487
ABSOLUTE MAXIMUM RATINGS
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
SO8
MiniSO8
DFN8
Power Dissipation
2)
SO8
MiniSO8
DFN8
Parameter
Value
6
-0.3v to V
CC
+
0.3v
-65 to +150
150
175
215
70
0.71
0.58
1.79
1.5
100
200
250
continous
4)
Unit
V
V
°C
°C
°C/W
Pd
W
Human Body Model (pin to pin): TS486, TS487
3)
ESD
Machine Model - 220pF - 240pF (pin to pin)
Latch-up Latch-up Immunity (All pins)
Lead Temperature (soldering, 10sec)
ESD
Output Short-Circuit to Vcc or GND
1. All voltage values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25°C, Tjunction = 150°C.
kV
V
mA
°C
3. TS487 stands 1.5KV on all pins except standby pin which stands 1KV.
4. Attention must be paid to continous power dissipation (V
DD
x 300mA). Exposure of the IC to a short circuit for an extended time period is
dramatically reducing product life expectancy.
OPERATING CONDITIONS
Symbol
V
CC
R
L
T
oper
C
L
Supply Voltage
Load Resistor
Operating Free Air Temperature Range
Load Capacitor
R
L
= 16 to 100Ω
R
L
> 100Ω
Standby Voltage Input
TS486 ACTIVE / TS487 in STANDBY
TS486 in STANDBY / TS487 ACTIVE
Parameter
Value
2 to 5.5
≥
16
-40 to + 85
400
100
1.5
≤
V
STB
≤
V
CC
GND
≤
V
STB
≤
0.4
1)
Unit
V
Ω
°C
pF
V
STB
V
1.
Thermal Resistance Junction to Ambient
SO8
150
R
THJA
MiniSO8
190
2)
41
DFN8
The minimum current consumption (
I
STANDBY)
is guaranteed at GND (TS486) or V
CC
(TS487) for the whole temperature range.
When mounted on a 4-layer PCB.
°C/W
2.
2/31
TS486-TS487
FIXED GAIN VERSION SPECIFIC ELECTRICAL CHARACTERISTICS
V
CC
from
+5V to +2V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
R
IN 1,2
Input Resistance
1)
Gain value for Gain TS486/TS487-1
G
Gain value for Gain TS486/TS487-2
Gain value for Gain TS486/TS487-4
1.
See figure 30 to establish the value of Cin vs. -3dB cut off frequency.
Parameter
Min.
Typ.
20
0dB
6dB
12dB
Max.
Unit
kΩ
dB
APPLICATION COMPONENTS INFORMATION
Components
R
IN1,2
C
IN1,2
R
FEED1,2
C
S
C
B
C
OUT1,2
Functional Description
Inverting input resistor which sets the closed loop gain in conjunction with R
FEED
. This resistor also
forms a high pass filter with C
IN
(fc = 1 / (2 x Pi x R
IN
x C
IN
)) .
Not needed in fixed gain versions.
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminal.
Feedback resistor which sets the closed loop gain in conjunction with R
IN
.
A
V
= Closed Loop Gain= -R
FEED
/R
IN
.
Not needed in fixed gain versions.
Supply Bypass capacitor which provides power supply filtering.
Bypass capacitor which provides half supply filtering.
Output coupling capacitor which blocks the DC voltage at the load input terminal.
This capacitor also forms a high pass filter with RL (fc = 1 / (2 x Pi x R
L
x C
OUT
)).
TYPICAL APPLICATION SCHEMATICS
3/31
TS486-TS487
ELECTRICAL CHARACTERISTICS
V
CC
=
+5V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
Symbol
I
CC
Parameter
Supply Current
No input signal, no load
Standby Current
No input signal,
No input signal,
V
STANDBY
=GND for TS486, R
L
=32Ω
V
STANDBY
=Vcc for TS487, R
L
=32Ω
Min.
Typ.
1.8
10
1
90
200
Max.
2.5
1000
Unit
mA
I
STANDBY
V
IO
I
IB
nA
mV
nA
Input Offset Voltage (V
ICM
= V
CC
/2)
Input Bias Current (V
ICM
= V
CC
/2)
1)
Output Power
THD+N
THD+N
THD+N
THD+N
=
=
=
=
0.1% Max, F = 1kHz, R
L
= 32Ω
1% Max, F = 1kHz, R
L
= 32Ω
0.1% Max, F = 1kHz, R
L
= 16Ω
1% Max, F = 1kHz, R
L
= 16Ω
P
O
60
95
64
65
102
108
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=-1)
R
L
= 32Ω, P
out
= 60mW, 20Hz
≤
F
≤
20kHz
R
L
= 16Ω, P
out
= 90mW, 20Hz
≤
F
≤
20kHz
Power Supply Rejection Ratio, inputs grounded
2)
(A
v
=-1), RL>=16Ω, C
B
=1µF, F = 1kHz, Vripple = 200mVpp
Max Output Current
THD +N
≤
1%, R
L
= 16Ω connected between out and V
CC
/2
Output Swing
V
OL
: R
L
= 32Ω
V
OH
: R
L
= 32Ω
V
OL
: R
L
= 16Ω
V
OH
: R
L
= 16Ω
Signal-to-Noise Ratio (A weighted, A
v
=-1)
2)
(R
L
= 32Ω, THD +N < 0.4%, 20Hz
≤
F
≤
20kHz)
Channel Separation, R
L
= 32Ω, A
v
=-1
F = 1kHz
F = 20Hz to 20kHz
Channel Separation, R
L
= 16Ω, A
v
=-1
F = 1kHz
F = 20Hz to 20kHz
Input Capacitance
Gain Bandwidth Product (R
L
= 32Ω)
Slew Rate, Unity Gain Inverting (R
L
= 16Ω)
53
106
0.3
0.3
58
115
%
PSRR
I
O
dB
mA
V
O
4.45
4.2
80
0.45
4.52
0.6
4.35
103
0.5
V
0.7
SNR
dB
Crosstalk
83
79
80
72
1
1.1
0.4
dB
C
I
GBP
SR
pF
MHz
V/µs
1. Only for external gain version.
2. Guaranteed by design and evaluation.
4/31
TS486-TS487
ELECTRICAL CHARACTERISTICS
V
CC
=
+3.3V,
GND =
0V,
T
amb
= 25°C (unless otherwise specified)
1)
Symbol
I
CC
Parameter
Supply Current
No input signal, no load
Standby Current
No input signal,
No input signal,
V
STANDBY
=GND for TS486, R
L
=32Ω
V
STANDBY
=Vcc for TS487, R
L
=32Ω
Min.
Typ.
1.8
10
1
90
200
Max.
2.5
1000
Unit
mA
I
STANDBY
V
IO
I
IB
nA
mV
nA
Input Offset Voltage (V
ICM
= V
CC
/2)
Input Bias Current (V
ICM
= V
CC
/2)
2)
Output Power
THD+N
THD+N
THD+N
THD+N
=
=
=
=
0.1% Max, F = 1kHz, R
L
= 32Ω
1% Max, F = 1kHz, R
L
= 32Ω
0.1% Max, F = 1kHz, R
L
= 16Ω
1% Max, F = 1kHz, R
L
= 16Ω
P
O
23
36
26
28
38
42
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=-1)
R
L
= 32Ω, P
out
= 16mW, 20Hz
≤
F
≤
20kHz
R
L
= 16Ω, P
out
= 35mW, 20Hz
≤
F
≤
20kHz
Power Supply Rejection Ratio, inputs grounded
3)
(A
v
=-1), RL>=16Ω, C
B
=1µF, F = 1kHz, Vripple = 200mVpp
Max Output Current
THD +N
≤
1%, R
L
= 16Ω connected between out and V
CC
/2
Output Swing
V
OL
: R
L
= 32Ω
V
OH
: R
L
= 32Ω
V
OL
: R
L
= 16Ω
V
OH
: R
L
= 16Ω
Signal-to-Noise Ratio (A weighted, A
v
=-1)
3)
(R
L
= 32Ω, THD +N < 0.4%, 20Hz
≤
F
≤
20kHz)
Channel Separation, R
L
= 32Ω, A
v
=-1
F = 1kHz
F = 20Hz to 20kHz
Channel Separation, R
L
= 16Ω, A
v
=-1
F = 1kHz
F = 20Hz to 20kHz
Input Capacitance
Gain Bandwidth Product (R
L
= 32Ω)
Slew Rate, Unity Gain Inverting (R
L
= 16Ω)
53
64
0.3
0.3
58
75
%
PSRR
I
O
dB
mA
V
O
2.85
2.68
80
0.3
3
0.45
2.85
98
0.38
V
0.52
SNR
dB
Crosstalk
80
76
77
69
1
1.1
0.4
dB
C
I
GBP
SR
1.
pF
MHz
V/µs
All electrical values are guaranted with correlation measurements at 2V and 5V.
2.
3.
Only for external gain version.
Guaranteed by design and evaluation.
5/31
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