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TS421
User Manual
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ST TS419, TS421 User Manual

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■OPERATING FROM Vcc=2V to 5.5V
■STANDBY MODE A CTIV E HIGH (TS419) or
LOW (TS421)
■OUTPUT POWER into 16Ω: 367mW @ 5V
with 10% THD+N max or 295mW @5V and
110mW @3.3V with 1% THD+N max.
■LOW CURRENT CONSUMPTION: 2.5mA max
■PSRR: 56dB typ. at 1kHz, 46dB at 217Hz
■SHORT CIRCUIT LIMITATION
■ON/OFF click reduction circuitry
■Available in SO8, MiniSO8 & DFN 3x3
DESCRIPTION
The TS419/TS421 is a monaural audio power am-
plifier driving in BTL mode a 16 or 32Ω earpiece or
receiver speaker. The main advantage of this con-
figuration is to get rid of bulky ouput capacitors.
Capable of descending to lo w voltages , it delivers
up to 220mW per channel (into 16Ω loads) of con-
tinuous average power with 0.2% THD+N in the
audio bandwidth from a 5V power supply.
An externally controlled standby mode reduces
the supply current to 10nA (typ.). The TS419/
TS421 can be configu red by external gain-setting
resistors or used in a fixed gain version.
APPLICATIONS
■16/32 ohms earpiece or receiver speaker driver
■Mobile and cordless phones (analog / digital)
■PDAs & c o mpute r s
■Portable appliances
ORDER CODE
MiniSO & DFN only available in Tape & Reel with T suffix.
SO is available in Tube (D) and in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part
Number
Temp.
Range:
I
Package
Gain Marking
DS Q
TS419
-40, +85°C
•
external TS419I
TS421
•
external TS421I
TS419
••
external K19A
TS419-2 tba tba x2/6dB K19B
TS419-4 tba tba x4/12dB K19C
TS419-8 tba tba x8/18dB K19D
TS421
••
external K21A
TS421-2 tba tba x2/6dB K21B
TS421-4 tba tba x4/12dB K21C
TS421-8 tba tba x8/18dB K21D
TS419IDT: SO8
TS419IST, TS419-xIST: MiniSO8
Standby
Bypass
V+
IN
V
IN-
V2
OUT
GND
V
CC
V
OUT1
1
2
3
4
8
7
6
5
TS421IDT: SO8
TS421IST, TS421-xIST: MiniSO8
TS419IQT, TS419-xIQT: DFN8
TS421IQT, TS421-xIQT: DFN8
1
2
3
4
5
8
7
6
STANDBY
BYPASS V
IN+
Vcc
V
OUT 1
GND
VIN-
VOUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS V
IN+
Vcc
V
OUT 1
GND
VIN-
VOUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS V
IN+
Vcc
V
OUT 1
GND
VIN-
VOUT 2
1
2
3
4
5
8
7
6
STANDBY
BYPASS V
IN+
Vcc
V
OUT 1
GND
VIN-
VOUT 2
TS419
TS421
360mW MONO AMPLIFIER WITH STANDBY MODE
June 2003
TS419-TS421
2/32
ABSOLUTE MAXIMUM RATINGS
OPERATING CONDITIONS
Symbol Parameter Value Unit
V
CC
Supply voltage
1)
6V
V
i
Input Voltage
-0.3V to V
CC
+0.3V
V
T
stg
Storage Temperature -65 to +150 °C
T
j
Maximum Junction Temperature 150 °C
R
thja
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
175
215
70
°C/W
Pd
Power Dissipation
2)
SO8
MiniSO8
DFN8
0.71
0.58
1.79
W
ESD
Human Body Model (pin to pin): TS419
3)
, TS421
1.5 kV
ESD Machine Model - 220pF - 240pF (pin to pin) 100 V
Latch-up Latch-up Immunity (All pins) 200 mA
Lead Temperature (soldering, 10sec ) 250 °C
Output Short-Circuit to Vcc or GND
continous
4)
1. All voltage values are measured with respect to the ground pin.
2. Pd has been calculated with Tamb = 25°C, Tjunction = 150°C.
3. TS419 stands 1.5KV on all pi ns except sta ndby pin which st ands 1KV.
4. Attention must be pai d to continou s power dissipat i on (V
DD
x 300mA). Exposure of the IC to a short circuit for an extended time period is
dramatically reduci ng product lif e expectan cy .
Symbol Parameter Value Unit
V
CC
Supply Voltage 2 to 5.5 V
R
L
Load Resistor
≥
16
Ω
T
oper
Operating Free Air Temperature Range -40 to + 85 °C
C
L
Load Capacitor
R
L
= 16 to 100
Ω
R
L
> 100
Ω
400
100
pF
V
ICM
Common Mode Input Voltage Range
GND to V
CC
-1V
V
V
STB
Standby Voltage Input
TS421 ACTIVE / TS419 in STANDBY
TS421 in STANDBY / TS419 ACTIVE
1.5
≤
V
STB
≤
V
CC
GND
≤
V
STB
≤
0.4
1)
V
R
THJA
Thermal Resistance Junction to Ambient
SO8
MiniSO8
DFN8
2)
150
190
41
°C/W
T
wu Wake-up time from standby to active mode (Cb = 1µF)
3)
≥
0.12 s
1. The minimum current consumption (I
STANDBY
) is guaranteed at V
CC
(TS419) or GND (TS421) for the whole temperature range.
2. Wh en m ounted on a 4-layer PCB
3. For more details on T
WU
, please refer to application note section on Wak e-up time pag e 28.
TS419-TS421
3/32
FIXED GAIN VERSION SPECIFIC ELECTRICAL CHARACTERISTI CS
V
CC
from +5V to +2V, GND = 0V, T
amb
= 25°C (unless otherwise specified)
APPLICATION COMPONENTS INFORMATION
TYPICAL APPLICATION SCHEMATICS:
Symbol Parameter Min. Typ. Max. Unit
R
IN
Input Resistance 20 k
Ω
G
Gain value for Gain TS419/TS421-2
Gain value for Gain TS419/TS421-4
Gain value for Gain TS419/TS421-8
6dB
12dB
18dB
dB
Components Functional Description
R
IN
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
(fcl = 1 / (2 x Pi x R
IN
x C
IN
)). Not needed in fixed gain versions.
C
IN
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminal
R
FEED
Feedback resistor which sets the closed loop gain in conjunction with R
IN
.
A
V
= Closed Loop Gain= 2xR
FEED
/R
IN
. Not needed in fixed gain versions.
C
S
Supply Bypass capacitor which provides power supply filtering.
C
B
Bypass capacitor which provides half supply filtering.
TS419-TS421
4/32
ELECTRICAL CHARACTERISTICS
V
CC
= +5V, GND = 0V , T
amb
= 25°C (unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
I
CC
Supply Current
No input signal, no load 1.8 2.5 mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10 1000 nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
Ω,
Rfeed=20k
Ω
525mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 16
Ω
166
240
190
207
258
270
295
367
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
Ω,
P
out
= 150mW, 20Hz
≤
F
≤
20kHz
R
L
= 16
Ω,
P
out
= 220mW, 20Hz
≤
F
≤
20kHz
0.15
0.2
%
PSRR
Power Supply Rejection Ratio (A
v
=2)
1)
F = 1kHz
,
Vripple = 200mVpp, input grounded, Cb=1µF
1. Guaranteed by design and evaluation.
50 56 dB
SNR
Signal-to-Noise Ratio (Filter Type A, A
v
=2)
1)
(R
L
= 32
Ω,
THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
85 98 dB
Φ
M
Phase Margin at Unity Gain
R
L
= 16
Ω
, C
L
= 400pF
58 Degrees
GM
Gain Margin
R
L
= 16
Ω
, C
L
= 400pF
18 dB
GBP
Gain Bandwidth Product
R
L
= 16
Ω
1.1 MHz
SR
Slew Rate
R
L
= 16
Ω
0.4 V/
µ
S
TS419-TS421
5/32
ELECTRICAL CHARACTERISTICS
V
CC
= +3.3V, GND = 0V, T
amb
= 25°C (unless otherwise specified)
1)
1. All electrical values are guaranted with correlation measurements at 2V and 5V
Symbol Parameter Min. Typ. Max. Unit
I
CC
Supply Current
No input signal, no load 1.8 2.5 mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10 1000 nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
Ω,
Rfeed=20k
Ω
525mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 16
Ω
65
91
75
81
102
104
113
143
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
Ω,
P
out
= 50mW, 20Hz
≤
F
≤
20kHz
R
L
= 16
Ω,
P
out
= 70mW, 20Hz
≤
F
≤
20kHz
0.15
0.2
%
PSRR
Power Supply Rejection Ratio
inputs grounded, F = 1kHz
,
Vripple = 200mVpp, Cb=1µF
50 56 dB
SNR
Signal-to-Noise Ratio (Weighted A, A
v
=2)
(R
L
= 32
Ω,
THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
82 94 dB
Φ
M
Phase Margin at Unity Gain
R
L
= 16
Ω
, C
L
= 400pF
58 Degrees
GM
Gain Margin
R
L
= 16
Ω
, C
L
= 400pF
18 dB
GBP
Gain Bandwidth Product
R
L
= 16
Ω
1.1 MHz
SR
Slew Rate
R
L
= 16
Ω
0.4 V/
µ
S
TS419-TS421
6/32
ELECTRICAL CHARACTERISTICS
V
CC
= +2.5V, GND = 0V, T
amb
= 25°C (unless otherwise specified)
1)
1. All electrical values are guaranted with correlation measurements at 2V and 5V
Symbol Parameter Min. Typ. Max. Unit
I
CC
Supply Current
No input signal, no load 1.7 2.5 mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10 1000 nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
Ω,
Rfeed=20k
Ω
525mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 16
Ω
32
44
37
41
52
50
55
70
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
Ω,
P
out
= 30mW, 20Hz
≤
F
≤
20kHz
R
L
= 16
Ω,
P
out
= 40mW, 20Hz
≤
F
≤
20kHz
0.15
0.2
%
PSRR
Power Supply Rejection Ratio (A
v
=2)
inputs grounded, F = 1kHz
,
Vripple = 200mVpp, Cb=1µF
50 56 dB
SNR
Signal-to-Noise Ratio (Weighted A, A
v
=2)
(R
L
= 32
Ω,
THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
80 91 dB
Φ
M
Phase Margin at Unity Gain
R
L
= 16
Ω
, C
L
= 400pF
58 Degrees
GM
Gain Margin
R
L
= 16
Ω
, C
L
= 400pF
18 dB
GBP
Gain Bandwidth Product
R
L
= 16
Ω
1.1 MHz
SR
Slew Rate
R
L
= 16
Ω
0.4 V/
µ
S
TS419-TS421
7/32
ELECTRICAL CHARACTERISTICS
V
CC
= +2V, GND = 0V, T
amb
= 25°C (unless otherwise specified)
Symbol Parameter Min. Typ. Max. Unit
I
CC
Supply Current
No input signal, no load 1.7 2.5 mA
I
STANDBY
Standby Current
No input signal, V
STANDBY
=GND for TS421
No input signal, V
STANDBY
=Vcc for TS419
10 1000 nA
Voo
Output Offset Voltage
No input signal, RL = 16 or 32
Ω,
Rfeed=20k
Ω
525mV
P
O
Output Power
THD+N = 0.1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 32
Ω
THD+N = 0.1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 1% Max, F = 1kHz, R
L
= 16
Ω
THD+N = 10% Max, F = 1kHz, R
L
= 16
Ω
19
24
20
23
30
26
30
40
mW
THD + N
Total Harmonic Distortion + Noise (A
v
=2)
R
L
= 32
Ω,
P
out
= 13mW, 20Hz
≤
F
≤
20kHz
R
L
= 16
Ω,
P
out
= 20mW, 20Hz
≤
F
≤
20kHz
0.1
0.15
%
PSRR
Power Supply Rejection Ratio (A
v
=2)
1)
inputs grounded, F = 1kHz
,
Vripple = 200mVpp, Cb=1µF
1. Guaranteed by design and evaluation.
49 54 dB
SNR
Signal-to-Noise Ratio (Weighted A, A
v
=2)
1)
(R
L
= 32
Ω,
THD +N < 0.5%, 20Hz
≤
F
≤
20kHz)
80 89 dB
Φ
M
Phase Margin at Unity Gain
R
L
= 16
Ω
, C
L
= 400pF
58 Degrees
GM
Gain Margin
R
L
= 16
Ω
, C
L
= 400pF
20 dB
GBP
Gain Bandwidth Product
R
L
= 16
Ω
1.1 MHz
SR
Slew Rate
R
L
= 16
Ω
0.4 V/
µ
S
TS419-TS421
8/32
Index of Graphs
Note : All measurements made with Rin=20kΩ, Cb=1µF, and Cin=10µF unless otherwise specified.
Description Figure Page
Common Curves
Open Loop Gain and Phase vs Frequency 1 to 12 9 to 10
Current Consumption vs Power Supply Voltage 13 11
Current Consumption vs Standby Voltage 14 to 19 11 to 12
Output Power vs Power Supply Voltage 20 to 23 12
Output Power vs Load Resistor 24 to 27 12 to 13
Power Dissipation vs Output Power 28 to 31 13 to 14
Power Derating vs Ambiant Temperature 32 14
Output Voltage Swing vs Supply Voltage 33 14
Low Frequency Cut Off vs Input Capacitor 34 14
Curves With 6dB Gain Setting (Av=2)
THD + N vs Output Power 35 to 43 15 to 16
THD + N vs Frequency 44 to 46 16
Signal to Noise Ratio vs Power Supply Voltage 47 to 48 17
Noise Floor 49 to 50 17
PSRR vs Frequency 51 to 55 17 to 18
Curves With 12dB Gain Setting (Av=4)
THD + N vs Output Power 56 to 64 19 to 20
THD + N vs Frequency 65 to 67 20
Signal to Noise Ratio vs Power Supply Voltage 68 to 69 21
Noise Floor 70 to 71 21
PSRR vs Frequency 72 to 76 21 to 22
Curves With 18dB Gain Setting (Av=8)
THD + N vs Output Power 77 to 85 23 to 24
THD + N vs Frequency 86 to 88 24
Signal to Noise Ratio vs Power Supply Voltage 89 to 90 25
Noise Floor 91 to 92 25
PSRR vs Frequency 93 to 97 25 to 26
TS419-TS421
9/32
Fig. 1: Open Loop Gain and Phase vs
Frequency
Fig. 3: Open Loop Gain and Phase vs
Frequency
Fig. 5: Open Loop Gain and Phase vs
Frequency
Fig. 2: Open Loop Gain and Phase vs
Frequency
Fig. 4: Open Loop Gain and Phase vs
Frequency
Fig. 6: Open Loop Gain and Phase vs
Frequency
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
RL = 8
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
ZL = 8
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
RL = 16
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
RL = 8
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
ZL = 8
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
RL = 16
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
TS419-TS421
10/32
Fig. 7: Open Loop Gain and Phase vs
Frequency
Fig. 9: Open Loop Gain and Phase vs
Frequency
Fig. 11: Open Loop Gain and Phase vs
Frequency
Fig. 8: Open Loop Gain and Phase vs
Frequency
Fig. 10: Open Loop Gain and Phase vs
Frequency
Fig. 12: Open Loop Gain and Phase vs
Frequency
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
ZL = 16
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
RL = 32
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 5V
ZL = 32
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
ZL = 16
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
RL = 32
Ω
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
0.1 1 10 100 1000 10000
-40
-20
0
20
40
60
80
-20
0
20
40
60
80
100
120
140
160
180
Gain (dB)
Frequency (kHz)
Vcc = 2V
ZL = 32
Ω
+400pF
Tamb = 25
°
C
Gain
Phase
Phase (Deg)
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