TS4890
Rail-to-rail output 1 W audio power amplifier with standby mode
active low
Datasheet - production data
62
The unity-gain stable amplifier can be configured
by external gain setting resistors.
0LQL62
Table 1. Device summary(1)
76 ,'7
76 ,67
Part number
Temp. range
TS4890IDT
Features
Marking
4890
-40 + 85 °C
TS4890IST
• Operating from VCC= 2.2 V to 5.5 V
4890I
1. Available in tape and reel only.
• 1 W rail-to-rail output power @ VCC= 5 V,
THD=1%, f=1 kHz, with 8 Ω load
• Ultra low consumption in standby mode (10 nA)
• 75 dB PSSR @ 217 Hz from 5 to 2.2 V
• Pop and click reduction circuitry
• Ultra low distortion (0.1%)
• Unity gain stable
• Available in SO8 and MiniSO8
Applications
• Mobile phones (cellular/cordless)
• Laptop/notebook computers
• PDAs
• Portable audio devices
Description
The TS4890 is an audio power amplifier, which
can deliver 1 W of continuous RMS output power
into 8 W load @ 5 V.
This audio amplifier shows 0.1% distortion level
(THD) from a 5 V supply for a Pout = 250 mW
RMS. An external standby mode control reduces
the supply current to less than 10 nA. An internal
thermal shutdown protection is also provided.
The TS4890 has been designed for high quality
audio applications such as mobile phones, and to
minimize the number of external components.
February 2019
This is information on a product in full production.
DocID8396 Rev 7
1/46
www.st.com
Contents
TS4890
Contents
1
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1
Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4
Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5
Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
6
7
2/46
5.1
BTL configuration principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.2
Gain in typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.3
Low and high frequency response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.4
Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.5
Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.6
Pop and click performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.7
Power amplifier design examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.1
SO8 package information (TS4890IDT) . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.2
MiniSO8 package information (TS4890IST) . . . . . . . . . . . . . . . . . . . . . . . 43
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
DocID8396 Rev 7
TS4890
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Table 14.
Table 15.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Component description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical characteristics (VCC= +3.3 V, GND= 0 V, Tamb = 25 °C, unless otherwise specified)
.......................................................................7
Electrical characteristics (VCC= +2.6 V, GND= 0 V, Tamb = 25 °C, unless otherwise specified)
.......................................................................8
Electrical characteristics (VCC= +2.2 V, GND= 0 V, Tamb = 25 °C, unless otherwise specified)
.......................................................................9
Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Components 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Components 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Components 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
SO8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
MiniSO8 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
DocID8396 Rev 7
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46
List of figures
TS4890
List of figures
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Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Open loop frequency response. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Open loop frequency response (ZL=8 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Open loop frequency response (VCC=3.3 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Open loop frequency response (560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Open loop frequency response (Vcc=2.6 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=2.6 V+560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=2.2 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=2.2 V+560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=5 V+ 560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open loop frequency response (Vcc=2.6 V; CL=560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Open loop frequency response (Vcc=2.2 V; CL=560 pF) . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power supply rejection ratio (PSRR) vs power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power Supply Rejection Ratio (PSRR) vs feedback capacitor . . . . . . . . . . . . . . . . . . . . . . 15
Power supply rejection ratio (PSRR) vs bypass capacitor . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power supply rejection ratio (PSRR) vs input capacitor . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Power supply rejection ratio (PSRR) vs feedback resistor . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pout @ THD + N = 1% vs supply voltage vs RL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Pout @ THD + N = 10% vs supply voltage vs RL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs Pout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs Pout (Vcc = 3.3 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs Pout (Vcc = 2.6 V). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Power dissipation vs Pout (F=1 kHz) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Power derating curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD + N vs output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD + N vs output power (VCC=5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD + N vs output power (GV=2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD + N vs output power (Vcc=3.3 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
THD + N vs output power (Vcc=2.6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (RL=4 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (VCC=2.2 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (Gv=10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (RL=8 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (Vcc=5 V, RL= 8 Ω) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
THD + N vs output power (Vcc=3.3 V, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
HD + N vs output power (Vcc=3.3 V, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD + N vs output power (Vcc=2.6 V, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD + N vs output power (Vcc=2.6 V, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD + N vs output power (Vcc=2.2 V, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD + N vs output power (Vcc=2.2 V, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
THD + N vs output power (Vcc=5 V, Gv= 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD + N vs output power (Vcc=5 V, Gv= 10). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD + N vs output power (Vcc=3.3 V, RL= 8 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD + N vs output power (Vcc=3.3 V, RL= 8 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD + N vs output power (Vcc=2.6 V, RL= 8 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . 20
THD + N vs output power (Vcc=2.6 V, RL= 8 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . 20
DocID8396 Rev 7
TS4890
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List of figures
THD + N vs output power (Vcc=2.2 V, RL= 8 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=2.2 V, RL= 8 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=5 V, RL= 16 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=5 V, RL= 16 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=3.3 V, RL= 16 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=3.3 V, RL= 16 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . 21
THD + N vs output power (Vcc=2.6 V, RL= 16 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs output power (Vcc=2.6 V, RL= 16 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs output power (Vcc=2.2 V, RL= 16 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs output power (Vcc=2.2 V, RL= 16 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs frequency (Vcc=5 V, RL= 4 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs frequency (Vcc=5 V, RL= 4 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
THD + N vs frequency (Vcc=3.3 V, RL= 4 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=3.3 V, RL= 4 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=2.6 V, RL= 4 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=2.6 V, RL= 4 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=2.2 V, RL= 4 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=2.2 V, RL= 4 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
THD + N vs frequency (Vcc=5 V, RL= 8 Ω, Gv= 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Vcc=5 V, RL= 8 Ω, Gv= 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Vcc=5 V, RL= 8 Ω, Gv= 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Pout= 450 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Pout= 400 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Pout= 200 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
THD + N vs frequency (Vcc=3.3 V, RL= 8 Ω, Gv= 10, Pout= 400 mW) . . . . . . . . . . . . . . . 25
THD + N vs frequency (Pout= 200 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD + N vs frequency (Pout= 220 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD + N vs frequency (Pout= 110 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD + N vs frequency (VCC=2.6 V, Pout= 220 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD + N vs frequency (Pout=110 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
THD + N vs frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Pout=75 mW ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Pout=150 mW ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Vcc=2.2 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Pout=310 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Vcc=5 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
THD + N vs frequency (Gv=2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
THD + N vs frequency (Vcc=3.3 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
THD + N vs frequency (Gv=10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
THD + N vs frequency (Vcc=2.6 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
THD + N vs frequency (Vcc=2.2 V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
THD + N vs frequency (Pout=50 mW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Signal-to-noise ratio vs power supply with unweighted filter (Gv=2) . . . . . . . . . . . . . . . . . 28
Signal-to-noise ratio vs power supply with unweighted filter (20Hz to 20kHz) . . . . . . . . . . 28
Signal-to-noise ratio vs power supply Gv=2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Signal-to-noise ratio vs power supply with weighted filter type A . . . . . . . . . . . . . . . . . . . . 28
Frequency response gain vs Cin, and Cfeed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Current consumption vs power supply voltage (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Current consumption vs standby voltage @ Vcc = 5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Current consumption vs standby voltage @ Vcc = 3.3 V . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Current consumption vs standby voltage @ Vcc = 2.6 V . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Current consumption vs standby voltage @ Vcc = 2.2 V . . . . . . . . . . . . . . . . . . . . . . . . . . 29
DocID8396 Rev 7
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List of figures
Figure 101.
Figure 102.
Figure 103.
Figure 104.
Figure 105.
Figure 106.
Figure 107.
Figure 108.
Figure 109.
Figure 110.
Figure 111.
Figure 112.
6/46
TS4890
Clipping voltage vs power supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Clipping voltage vs power supply voltage and load resistor . . . . . . . . . . . . . . . . . . . . . . . . 29
Vout1+Vout2 unweighted noise floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Vout1+Vout2 A-weighted noise floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Demoboard schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SO8 and MiniSO8 demoboard component side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SO8 and MiniSO8 demoboard top solder layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
SO8 and MiniSO8 demoboard bottom solder layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PSRR changes with Cb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
PSRR measurement schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
SO8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
MiniSO8 package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
DocID8396 Rev 7
TS4890
General information
1
General information
1.1
Pin connections (top view)
Figure 1. Pin connections (top view)
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Figure 2. Typical application schematic
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Table 2. Component description
Components
Functional description
Rin
Inverting input resistor which sets the closed loop gain in conjunction with
Rfeed. This resistor also forms a high pass filter with Cin (fc = 1 / (2 x Pi x
Rin x Cin))
Cin
Input coupling capacitor which blocks the DC voltage at the amplifier input
terminal
Rfeed
Feed back resistor which sets the closed loop gain in conjunction with Rin
Cs
Supply bypass capacitor which provides power supply filtering
Cb
Bypass pin capacitor which provides half supply filtering
Cfeed
Low pass filter capacitor allowing the high frequency to be cut
(low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed))
DocID8396 Rev 7
7/46
46
General information
TS4890
Table 2. Component description
Components
Rstb
Gv
8/46
Functional description
Pull-down resistor which fixes the right supply level on the standby pin
Closed loop gain in BTL configuration = 2 x (Rfeed / Rin)
DocID8396 Rev 7
TS4890
2
Absolute maximum ratings
Absolute maximum ratings
Table 3. Absolute maximum ratings
Symbol
VCC
Vi
Parameter
Value
Supply volatge(1)
Input voltage
(2)
6
V
GND to VCC
Toper
Operating free air
temperature range
-40 to + 85
Tstg
Storage temperature
-65 to +150
Tj
Rthja
Pd
Maximum junction
temperature
Thermal resistance
junction to ambient (3)
Unit
°C
150
175 (SO8)
°C/W
215 (MiniSO8)
Power dissipation(4)
See
W
Human body model
2
kV
200
V
ESD
Machine model
Latch-up immunity
Class A
Lead temperature
(soldering, 10 s)
260
°C
1. All voltages values are measured with respect to the ground pin.
2. The magnitude of input signal must never exceed VCC + 0.3 V / GND - 0.3 V.
3. The device is protected in case of overtemperature by a thermal shutdown active @ 150 °C.
4. Exceeding the power derating curves during a long period may involve abnormal working of the device.
Table 4. Operating conditions
Symbol
Parameter
Value
VCC
Supply volatge
VICM
Common mode input
voltage range
GND + 1 V to VCC
VSTB
Standby voltage input:
device on
device off
1.5 ≤ VSTB ≤ VCC
GND ≤ VSTB ≤ 0.5
RL
Rthja
Load resistor
Thermal resistance
junction-to-ambient (1)
Unit
2.2 to 5.5
V
4 -32
Ω
150 (SO8)
°C/W
190 (MiniSO8)
1. This thermal resistance can be reduced with a suitable PCB layout (see Fig. 24).
DocID8396 Rev 7
9/46
46
Electrical characteristics
3
TS4890
Electrical characteristics
VCC = +5 V, GND = 0 V, Tamb = 25 °C (unless otherwise specified)
Table 5. Electrical characteristics
Symbol
Typ.
Max.
Unit
Supply current
no input signal, no load
6
8
mA
Standby current (1), no input signal,
Vstdby = GND, RL = 8 Ω
10
1000
nA
Voo
Output offset voltage
no input signal, RL = 8 Ω
5
20
mV
Po
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
1
W
0.15
%
Power supply rejection ratio (2)
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ,
Vripple = 200 mV RMS
77
dB
ɸM
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
70
Degrees
GM
Gain margin
RL = 8 Ω, CL = 500 pF
20
dB
GBP
Gain bandwidth product
RL = 8 Ω
2
MHz
ICC
ISTANDBY
THD + N
PSRR
Parameter
Min.
Total harmonic distortion + noise
Po = 250 mW RMS, Gv = 2,
20 Hz < f < 20 kHz, RL = 8 Ω
1. Standby mode is active when Vstdby is tied to GND.
2. Dynamic measurements - 20*log(RMS(Vout)/RMS(Vripple)). Vripple is the superimposed sinus signal to VCC
@ f = 217 Hz.
Table 6. Electrical characteristics (VCC= +3.3 V, GND= 0 V, Tamb = 25 °C, unless
otherwise specified)
Symbol
Typ.
Max.
Unit
Supply current
no input signal, no load
5.5
8
mA
Standby current (1), no input signal,
Vstdby = GND, RL = 8 Ω
10
1000
nA
Voo
Output offset voltage
no input signal, RL = 8 Ω
5
20
mV
Po
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
ICC
ISTANDBY
10/46
Parameter
DocID8396 Rev 7
Min.
450
mW
TS4890
Electrical characteristics
Table 6. Electrical characteristics (VCC= +3.3 V, GND= 0 V, Tamb = 25 °C, unless
otherwise specified)
Symbol
THD + N
Parameter
Min.
Total harmonic distortion + noise
Po = 250 mW RMS, Gv = 2,
20 Hz < f < 20 kHz, RL = 8 Ω
Typ.
Max.
Unit
0.15
%
Power supply rejection ratio (2)
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ,
Vripple = 200 mV RMS
77
dB
ɸM
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
70
Degrees
GM
Gain margin
RL = 8 Ω, CL = 500 pF
20
dB
GBP
Gain bandwidth product
RL = 8 Ω
2
MHz
PSRR
1. Standby mode is active when Vstdby is tied to GND.
2. Dynamic measurements - 20*log(RMS(Vout)/RMS(Vripple)). Vripple is the superimposed sinus signal to VCC
@ f = 217 Hz.
Table 7. Electrical characteristics (VCC= +2.6 V, GND= 0 V, Tamb = 25 °C, unless
otherwise specified)
Symbol
Typ.
Max.
Unit
Supply current
no input signal, no load
5
8
mA
Standby current (1), no input signal,
Vstdby = GND, RL = 8 Ω
10
1000
nA
Voo
Output offset voltage
no input signal, RL = 8 Ω
5
20
mV
Po
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
260
mW
Total harmonic distortion + noise
Po = 200 mW RMS, Gv = 2,
20 Hz < f < 20 kHz, RL = 8 Ω
0.15
%
Power supply rejection ratio (2)
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ,
Vripple = 200 mV RMS
77
dB
ɸM
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
70
Degrees
GM
Gain margin
RL = 8 Ω, CL = 500 pF
20
dB
GBP
Gain bandwidth product
RL = 8 Ω
2
MHz
ICC
ISTANDBY
THD + N
PSRR
Parameter
DocID8396 Rev 7
Min.
11/46
46
Electrical characteristics
TS4890
1. Standby mode is active when Vstdby is tied to GND.
2. Dynamic measurements - 20*log(RMS(Vout)/RMS(Vripple)). Vripple is the superimposed sinus signal to VCC
@ f = 217 Hz.
Table 8. Electrical characteristics (VCC= +2.2 V, GND= 0 V, Tamb = 25 °C, unless
otherwise specified)
Symbol
Typ.
Max.
Unit
Supply current
no input signal, no load
5
8
mA
Standby current (1), no input signal,
Vstdby = GND, RL = 8 Ω
10
1000
nA
Voo
Output offset voltage
no input signal, RL = 8 Ω
5
20
mV
Po
Output power
THD = 1% max., f = 1 kHz, RL = 8 Ω
180
mW
Total harmonic distortion + noise
Po = 200 mW RMS, Gv = 2,
20 Hz < f < 20 kHz, RL = 8 Ω
0.15
%
Power supply rejection ratio (2)
f = 217 Hz, RL = 8 Ω, RFeed = 22 kΩ,
Vripple = 100 mV RMS
77
dB
ɸM
Phase margin at unity gain
RL = 8 Ω, CL = 500 pF
70
Degrees
GM
Gain margin
RL = 8 Ω, CL = 500 pF
20
dB
GBP
Gain bandwidth product
RL = 8 Ω
2
MHz
ICC
ISTANDBY
THD + N
PSRR
Parameter
Min.
1. Standby mode is active when Vstdby is tied to GND.
2. Dynamic measurements - 20*log(RMS(Vout)/RMS(Vripple)). Vripple is the superimposed sinus signal to VCC
@ f = 217 Hz.
12/46
DocID8396 Rev 7
TS4890
Electrical characteristics curves
4
Electrical characteristics curves
Figure 3. Open loop frequency response
Figure 4. Open loop frequency response (ZL=8
Ω)
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13/46
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Electrical characteristics curves
TS4890
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(Vcc=2.2 V)
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(Vcc=5 V)
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(Vcc=5 V+ 560 pF)
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(Vcc=2.2 V+560 pF)
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(Vcc=2.6 V+560 pF)
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Figure 7. Open loop frequency response
(Vcc=2.6 V)
TS4890
Electrical characteristics curves
Figure 14. Open loop frequency response
(Vcc=2.2 V; CL=560 pF)
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(PSRR) vs feedback capacitor
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vs power supply
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vs input capacitor
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DocID8396 Rev 7
15/46
46
Electrical characteristics curves
TS4890
Figure 19. Power supply rejection ratio (PSRR)
vs feedback resistor
Figure 20. Pout @ THD + N = 1% vs supply
voltage vs RL
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voltage vs RL
Figure 22. Power dissipation vs Pout
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Figure 24. Power dissipation vs Pout
(Vcc = 2.6 V)
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DocID8396 Rev 7
TS4890
Electrical characteristics curves
Figure 25. Power dissipation vs Pout (F=1 kHz)
Figure 26. Power derating curves
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Figure 28. THD + N vs output power (VCC=5 V)
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Figure 30. THD + N vs output power (Vcc=3.3 V)
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Electrical characteristics curves
TS4890
Figure 31. THD + N vs output power (Vcc=2.6 V)
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Figure 34. THD + N vs output power (Gv=10)
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Figure 35. THD + N vs output power (RL=8 Ω)
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Figure 36. THD + N vs output power (Vcc=5 V,
RL= 8 Ω)
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18/46
DocID8396 Rev 7
2XWSXW3RZHU :
TS4890
Electrical characteristics curves
Figure 37. THD + N vs output power (Vcc=3.3 V,
Gv= 2)
Figure 38. HD + N vs output power (Vcc=3.3 V,
Gv= 10)
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Figure 39. THD + N vs output power (Vcc=2.6 V, Figure 40. THD + N vs output power (Vcc=2.6 V,
Gv= 2)
Gv= 10)
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Figure 41. THD + N vs output power (Vcc=2.2 V, Figure 42. THD + N vs output power (Vcc=2.2 V,
Gv= 2)
Gv= 10)
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19/46
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Electrical characteristics curves
TS4890
Figure 43. THD + N vs output power (Vcc=5 V,
Gv= 2)
Figure 44. THD + N vs output power (Vcc=5 V,
Gv= 10)
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Figure 45. THD + N vs output power (Vcc=3.3 V, Figure 46. THD + N vs output power (Vcc=3.3 V,
RL= 8 Ω, Gv= 2)
RL= 8 Ω, Gv= 10)
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Figure 47. THD + N vs output power (Vcc=2.6 V, Figure 48. THD + N vs output power (Vcc=2.6 V,
RL= 8 Ω, Gv= 2)
RL= 8 Ω, Gv= 10)
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DocID8396 Rev 7
2XWSXW3RZHU :
TS4890
Electrical characteristics curves
Figure 49. THD + N vs output power (Vcc=2.2 V, Figure 50. THD + N vs output power (Vcc=2.2 V,
RL= 8 Ω, Gv= 2)
RL= 8 Ω, Gv= 10)
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Figure 51. THD + N vs output power (Vcc=5 V,
RL= 16 Ω, Gv= 2)
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Figure 52. THD + N vs output power (Vcc=5 V,
RL= 16 Ω, Gv= 10)
2XWSXW3RZHU :
N+]
5/ :9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
N+]
N+]
+]N+]
(
2XWSXW3RZHU :
(
+]
2XWSXW3RZHU :
Figure 53. THD + N vs output power (Vcc=3.3 V, Figure 54. THD + N vs output power (Vcc=3.3 V,
RL= 16 Ω, Gv= 2)
RL= 16 Ω, Gv= 10)
5/ :9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
7+'1
7+'1
N+]
5/ :
9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
N+]
N+]
+]N+]
(
2XWSXW3RZHU :
(
DocID8396 Rev 7
+]
2XWSXW3RZHU :
21/46
46
Electrical characteristics curves
TS4890
Figure 55. THD + N vs output power (Vcc=2.6 V, Figure 56. THD + N vs output power (Vcc=2.6 V,
RL= 16 Ω, Gv= 2)
RL= 16 Ω, Gv= 10)
N+]
5/ :
9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
7+'1
7+'1
5/ :
9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
+]
N+]
N+]
+]N+]
(
2XWSXW3RZHU :
(
2XWSXW3RZHU :
Figure 57. THD + N vs output power (Vcc=2.2 V, Figure 58. THD + N vs output power (Vcc=2.2 V,
RL= 16 Ω, Gv= 2)
RL= 16 Ω, Gv= 10)
5/ :
9FF 9
*Y
&E &LQ P)
%: N+]
7DPE q&
5/ :9FF 9
*Y &E &LQ P)
%: N+]7DPE q&
N+]
+]
7+'1
7+'1
N+]
+]
N+]
(
N+]
2XWSXW3RZHU :
(
2XWSXW3RZHU :
Figure 59. THD + N vs frequency (Vcc=5 V, RL= Figure 60. THD + N vs frequency (Vcc=5 V, RL=
4 Ω, Gv= 2)
4 Ω, Gv= 10)
3RXW :
22/46
)UHTXHQF\ +]
3RXW P:
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
3RXW P:
3RXW :
7+'1
7+'1
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
DocID8396 Rev 7
)UHTXHQF\ +]
TS4890
Electrical characteristics curves
Figure 61. THD + N vs frequency (Vcc=3.3 V,
RL= 4 Ω, Gv= 2)
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
7+'1
7+'1
Figure 62. THD + N vs frequency (Vcc=3.3 V,
RL= 4 Ω, Gv= 10)
3RXW P:
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
3RXW P:
3RXW P:
3RXW P:
)UHTXHQF\ +]
Figure 63. THD + N vs frequency (Vcc=2.6 V,
RL= 4 Ω, Gv= 2)
)UHTXHQF\ +]
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
3RXW P:
Figure 64. THD + N vs frequency (Vcc=2.6 V,
RL= 4 Ω, Gv= 10)
7+'1
7+'1
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
3RXW P:
3RXW P:
)UHTXHQF\ +]
Figure 65. THD + N vs frequency (Vcc=2.2 V,
RL= 4 Ω, Gv= 2)
3RXW P:
)UHTXHQF\ +]
Figure 66. THD + N vs frequency (Vcc=2.2 V,
RL= 4 Ω, Gv= 10)
7+'1
7+'1
5/ :9FF 9
*Y
&E P)
%: N+]
7DPE q&
5/ :9FF 9
*Y
&E P)
%: N+]
7DPE q&
3RXW P:
3RXW P:
3RXW P:
)UHTXHQF\ +]
DocID8396 Rev 7
)UHTXHQF\ +]
23/46
46
Electrical characteristics curves
TS4890
Figure 67. THD + N vs frequency (Vcc=5 V, RL= Figure 68. THD + N vs frequency (Vcc=5 V, RL=
8 Ω, Gv= 2)
8 Ω, Gv= 2
5/ :
9FF 9
*Y
3RXW P:
%: N+]
7DPE &
&E )
5/ :
9FF 9
*Y
3RXW P:
%: N+]
7DPE &
7+'1
7+'1
&E )
&E )
&E )
)UHTXHQF\ +]
Figure 69. THD + N vs frequency (Vcc=5 V, RL=
8 Ω, Gv= 10)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
&E )
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
&E )
&E )
&E )
)UHTXHQF\ +]
Figure 71. THD + N vs frequency (Pout= 400
mW)
)UHTXHQF\ +]
&E )
&E )
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
7+'1
7+'1
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
Figure 72. THD + N vs frequency (Pout= 200
mW)
24/46
)UHTXHQF\ +]
Figure 70. THD + N vs frequency (Pout= 450
mW)
7+'1
7+'1
&E )
&E )
)UHTXHQF\ +]
DocID8396 Rev 7
)UHTXHQF\ +]
TS4890
Electrical characteristics curves
Figure 73. THD + N vs frequency (Vcc=3.3 V,
RL= 8 Ω, Gv= 10, Pout= 400 mW)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
7+'1
7+'1
Figure 74. THD + N vs frequency (Pout= 200
mW)
&E )
&E )
&E )
&E )
)UHTXHQF\ +]
Figure 75. THD + N vs frequency (Pout= 220
mW)
)UHTXHQF\ +]
Figure 76. THD + N vs frequency (Pout= 110
mW)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
7+'1
7+'1
&E )
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
&E )
&E )
&E )
)UHTXHQF\ +]
Figure 77. THD + N vs frequency (VCC=2.6 V,
Pout= 220 mW)
7+'1
&E )
&E )
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
&E )
&E )
)UHTXHQF\ +]
Figure 78. THD + N vs frequency (Pout=110 mW)
7+'1
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE &
)UHTXHQF\ +]
)UHTXHQF\ +]
DocID8396 Rev 7
25/46
46
Electrical characteristics curves
TS4890
Figure 79. THD + N vs frequency
Figure 80. THD + N vs frequency (Pout=75 mW )
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE q&
7+'1
7+'1
&E P)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE q&
&E P)
&E P)
&E P)
)UHTXHQF\ +]
Figure 81. THD + N vs frequency (Pout=150 mW
)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE q&
&E P)
&E P)
&E P)
5/ :9FF 9
*Y
3RXW P:
%: N+]
7DPE q&
&E P)
)UHTXHQF\ +]
Figure 82. THD + N vs frequency (Vcc=2.2 V)
7+'1
7+'1
)UHTXHQF\ +]
Figure 83. THD + N vs frequency (Pout=310
mW)
)UHTXHQF\ +]
Figure 84. THD + N vs frequency (Vcc=5 V)
5/ :9FF 9
*Y &E )
%: N+]
7DPE &
7+'1
5/ :9FF 9
*Y &E )
%: N+]
7DPE &
3RXW P:
7+'1
3RXW P:
3RXW P:
3RXW P:
26/46
)UHTXHQF\ +]
DocID8396 Rev 7
)UHTXHQF\ +]
TS4890
Electrical characteristics curves
Figure 85. THD + N vs frequency (Gv=2)
Figure 86. THD + N vs frequency (Vcc=3.3 V)
7+'1
7+'1
5/ :9FF 9
*Y &E )
%: N+]
7DPE &
3RXW P:
5/ :9FF 9
*Y
&E )
%: N+]
7DPE &
3RXW P:
3RXW P:
3RXW P:
)UHTXHQF\ +]
Figure 87. THD + N vs frequency (Gv=10)
5/ :9FF 9
*Y &E P)
%: N+]
7DPE q&
3RXW P:
7+'1
5/ :9FF 9
*Y &E P)
%: N+]
7DPE q&
7+'1
)UHTXHQF\ +]
Figure 88. THD + N vs frequency (Vcc=2.6 V)
3RXW P:
3RXW P:
)UHTXHQF\ +]
3RXW P:
Figure 89. THD + N vs frequency (Vcc=2.2 V)
)UHTXHQF\ +]
5/ :9FF 9
*Y &E P)
%: N+]
7DPE q&
7+'1
5/ :9FF 9
*Y &E P)
%: N+]
7DPE q&
Figure 90. THD + N vs frequency (Pout=50 mW)
7+'1
3RXW P:
3RXW P:
3RXW P:
)UHTXHQF\ +]
DocID8396 Rev 7
)UHTXHQF\ +]
27/46
46
Electrical characteristics curves
TS4890
Figure 91. Signal-to-noise ratio vs power supply Figure 92. Signal-to-noise ratio vs power supply
with unweighted filter (Gv=2)
with unweighted filter (20Hz to 20kHz)
5/ :
5/ :
615 G%
615 G%
5/ :
9FF 9
5/ :
5/ :
*Y
&E &LQ P)
7+'1
7DPE q&
*Y
&E &LQ P)
7+'1
7DPE q&
5/ :
9FF 9
Figure 93. Signal-to-noise ratio vs power supply Figure 94. Signal-to-noise ratio vs power supply
Gv=2
with weighted filter type A
5/ :
615 G%
615 G%
5/ :
5/ :
9FF 9
&IHHG S)
&IHHG S)
28/46
&LQ Q)
&IHHG Q)
9FF 9
9VWDQGE\ 9FF
7DPE q&
&LQ Q)
&LQ Q)
,FF P$
*DLQ G%
Figure 96. Current consumption vs power
supply voltage (no load)
5/ :
*Y
&E &LQ P)
7+'1
7DPE q&
Figure 95. Frequency response gain vs Cin, and
Cfeed
5/ :
*Y
&E &LQ P)
7+'1
7DPE q&
5/ :
5LQ 5IHHG N:
7DPE q&
)UHTXHQF\ +]
9FF 9
DocID8396 Rev 7
TS4890
Electrical characteristics curves
Figure 97. Current consumption vs standby
voltage @ Vcc = 5 V
Figure 98. Current consumption vs standby
voltage @ Vcc = 3.3 V
,FF P$
,FF P$
9FF 9
7DPE q&
9VWDQGE\ 9
9FF 9
7DPE q&
9VWDQGE\ 9
Figure 99. Current consumption vs standby
voltage @ Vcc = 2.6 V
Figure 100. Current consumption vs standby
voltage @ Vcc = 2.2 V
,FF P$
,FF P$
9FF 9
7DPE q&
9VWDQGE\ 9
9VWDQGE\ 9
Figure 102. Clipping voltage vs power supply
voltage and load resistor
7DPE q&
9RXW 9RXW
&OLSSLQJ9ROWDJH/RZVLGH 9
9RXW 9RXW
&OLSSLQJ9ROWDJH+LJKVLGH 9
9FF 9
7DPE q&
Figure 101. Clipping voltage vs power supply
voltage
5/ :
5/ :
5/ :
7DPE q&
5/ :
5/ :
5/ :
3RZHUVXSSO\9ROWDJH 9
3RZHUVXSSO\9ROWDJH 9
DocID8396 Rev 7
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46
Electrical characteristics curves
TS4890
Figure 103. Vout1+Vout2 unweighted noise floor Figure 104. Vout1+Vout2 A-weighted noise floor
2XWSXW1RLVH9RO WDJH 9
$Y
6WDQGE\PRGH
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30/46
$Y
6WDQGE\PRGH
$Y
9FF 9WR97D PE &
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,QSXW*URXQGHG
%: +]WRN+] $:HLJKWHG
2XWSXW1RLVH9ROW DJH 9
9FF 9WR97DPE &
&E &LQ )
,QSXW*URXQGHG
%: +]WRN+] 8QZHLJKWHG
)UHTXHQF\ +]
DocID8396 Rev 7
)UHTXHQF\ +]
TS4890
Application information
Figure 105. Demoboard schematic
&
5
&
5
6
9FF
9FF
9FF
6
*1'
&
5
3RV LQSXW
3
9FF
5
N
5
&
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5
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287
6
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6
5
5
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6
9FF
3
&
Q
&
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$Y
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&
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%LDV
'
3: 21
*1'
5
Application information
76
&
&
X
&
Figure 106. SO8 and MiniSO8 demoboard component side
DocID8396 Rev 7
31/46
46
Application information
TS4890
Figure 107. SO8 and MiniSO8 demoboard top solder layer
Figure 108. SO8 and MiniSO8 demoboard bottom solder layer
5.1
BTL configuration principle
The TS4890 is a monolithic power amplifier with a BTL output type. BTL (bridge tied load)
means that each end of the load are connected to two single ended output amplifiers. Thus,
we have:
•
Single ended output 1 = Vout1 = Vout (V)
•
Single ended output 2 = Vout2 = Vout (V)
•
and Vout1 - Vout2 = 2Vout (V)
The output power is:
32/46
DocID8396 Rev 7
TS4890
Application information
2
( 2VoutRMS )
Pout = ------------------------------------ ( W )
RL
For the same power supply voltage, the output power in BTL configuration is four times
higher than the output power in single ended configuration.
5.2
Gain in typical application schematic
In flat region (no effect of Cin), the output voltage of the first stage is:
Rfeed
Vout1 = – Vin ----------------- ( V )
Rin
For the second stage: Vout2 = -Vout1 (V)
The differential output voltage is:
Rfeed
Vout2 – Vout1 = 2Vin ----------------- ( V )
Rin
The differential gain named gain (Gv) for more convenient usage is:
Vout2 – Vout1
Rfeed
Gv = ---------------------------------------- = 2 ----------------Vin
Rin
Remark: Vout2 is in phase with Vin and Vout1 is 180 phased with Vin. It means that the
positive terminal of the loudspeaker should be connected to Vout2 and the negative to
Vout1.
5.3
Low and high frequency response
In low frequency region, the effect of Cin starts. Cin with Rin forms a high pass filter with a 3 dB cut-off frequency.
1
FCL = --------------------------- ( Hz )
2πRinCin
In high frequency region, you can limit the bandwidth by adding a capacitor (Cfeed) in
parallel on Rfeed. Its form a low pass filter with a -3 dB cut-off frequency.
1
F CH = ------------------------------------------ ( Hz )
2πRfeedCfeed
DocID8396 Rev 7
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46
Application information
5.4
TS4890
Power dissipation and efficiency
Hypothesis:
•
Voltage and current in the load are sinusoidal (Vout and Iout)
•
Supply voltage is a pure DC source (Vcc)
Regarding the load we have:
VOUT = V PEAK sin ωt ( V )
and
V OUT
IOUT = -------------- ( A )
RL
and
V
2
PEAK
P OUT = ------------------- ( W )
2R L
Then, the average current delivered by the supply voltage is:
VPEAK
Icc AVG = 2 ----------------- ( A )
πR L
The power delivered by the supply voltage is Psupply = Vcc IccAVG (W).
Then, the power dissipated by the amplifier is Pdiss = Psupply - Pout (W)
2 2Vcc
Pdiss = ---------------------- P OUT – P OUT ( W )
π R
L
and the maximum value is obtained when
∂Pdiss
------------------- = 0
∂POUT
and its value is
2
2Vcc Pdissmax = ---------------(W)
2
π RL
Remark: This maximum value is only depending on power supply voltage and load values.
The efficiency is the ratio between the output power and the power supply.
34/46
DocID8396 Rev 7
TS4890
Application information
P OUT
πV PEAK
η = ----------------------- = --------------------Psupply
4Vcc
The maximum theoretical value is reached when Vpeak = Vcc, so
π
--- = 78.5percentage
4
5.5
Decoupling of the circuit
Two capacitors are needed to bypass properly the TS4890. A power supply bypass
capacitor Cs and a bias voltage bypass capacitor Cb.
Cs has especially an influence on the THD+N in high frequency (above 7kHz) and indirectly
on the power supply disturbances.
With 100 µF, you can expect similar THD+N performance like shown in the datasheet.
If Cs is lower than 100 µF, in high frequency THD+N increases and disturbances on the
power supply rail are less filtered.
To the contrary, if Cs is higher than 100ìF, those disturbances on the power supply rail are
more filtered.
Cb has an influence on THD+N in lower frequency, but its function is critical on the final
result of PSRR with input grounded in lower frequency.
If Cb is lower than 1 µF, THD+N increases in lower frequency (see THD+N vs frequency
curves) and the PSRR worsens up.
If Cb is higher than 1 µF, the benefit on THD+N in lower frequency is small but the benefit on
PSRR is substantial (see PSRR vs. Cb curves).
Note that Cin has a non-negligible effect on PSRR in lower frequency. Lower is its value,
higher is the PSRR.
5.6
Pop and click performance
In order to have the best performances with the pop and click circuitry, the formula below
must be followed:
τ in ≤ τ b
with
τin = ( R in + R feed ) × C in ( s )
DocID8396 Rev 7
35/46
46
Application information
TS4890
and
τb = 50kΩ × C b ( s )
5.7
Power amplifier design examples
Given:
•
Load impedance: 8 Ω
•
Output power @ 1% THD+N: 0.5 W
•
Input impedance:10 kΩ min.
•
Input voltage peak to peak: 1 Vpp
•
Bandwidth frequency: 20 Hz to 20 kHz (0, -3 dB)
•
THD+N in 20 Hz to 20 kHz < 0.5% @Pout=0.45 W
•
Ambient temperature max. = 50 °C
•
SO8 package
First of all, we must calculate the minimum power supply voltage to obtain 0.5 W into 8 W.
See curves in Figure 15, we can read 3.5 V. Thus, the power supply voltage value min. is
3.5 V. Following the maximum power dissipation equation:
2
2Vcc Pdissmax = ---------------(W)
2
π RL
with 3.5 V we have Pdissmax = 0.31 W.
Refer to power derating curves (Figure 24), with 0.31 W the maximum ambient temperature
is 100 °C. This last value could be higher if you follow the example layout shows on the
demoboard (better dissipation).
The gain of the amplifier in flat region is:
V OUTPP 2 2R L POUT
G V = --------------------- = ------------------------------- = 5.65
VINPP
V INPP
We have Rin > 10 kW. Let us take Rin = 10 kΩ, then Rfeed = 28.25 kΩ. We could use for
Rfeed = 30 kΩ in normalized value and the gain is Gv = 6.
In lower frequency we want 20 Hz (-3dB cut off frequency). Then:
1
C IN = --------------------------- = 795nF
2πRinFCL
So, we could use for CIN a 1 µF capacitor value that gives 16 Hz. In higher frequency we
want 20 kHz (-3dB cut off frequency). The Gain bandwidth product of the TS4890 is 2 MHz
typical and does not change when the amplifier delivers power into the load. The first
amplifier has a gain of:
36/46
DocID8396 Rev 7
TS4890
Application information
Rfeed
----------------- = 3
Rin
and the theoretical value of the -3 dB cut of higher frequency is 2 MHz/3 = 660 kHz. We can
keep this value or limiting the bandwidth by adding a capacitor Cfeed, in parallel on Rfeed.
Then:
1
C FEED = ------------------------------------ = 265pF
2πR FEED F CH
So, we could use for Cfeed a 220 pF capacitor value that gives 24 kHz. Now, we can choose
the value of Cb with the constraint THD+N in 20 Hz to 20 kHz < 0.5% @ Pout=0.45 W. If you
refer to the closest THD+N vs frequency measurement: Figure 71 (Vcc=3.3 V, Gv=10), with
Cb = 1 µF, the THD+N vs frequency is always below 0.4%. As the behavior is the same with
Vcc = 5 V (Figure 67), Vcc = 2.6 V (Figure 67). As the gain for these measurements is
higher (worst case), we can consider with Cb = 1 µF, Vcc = 3.5 V and Gv = 6, that the
THD+N in 20 Hz to 20 kHz range with Pout = 0.45 W is lower than 0.4%. In the following
tables, you could find three another examples with values required for the demoboard.
Remark: components with (*) marking are optional.
Application n°1: 20 Hz to 20 kHz bandwidth and 6 dB gain BTL power
amplifier
Table 9. Components
Designator
Part type
R1
22 k / 0.125 W
R4
22 k / 0.125 W
R6
Short-circuit
R7
(Vcc-Vf_led)/If_led
R8
10 k/0.125 W
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug
10.16 mm pitch
S8
3 connector 2.54 mm
pitch
P1
PCB phono jack
D1
Led 3 mm
U1
TS4890ID or TS4890IS
DocID8396 Rev 7
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46
Application information
TS4890
Application n°2: 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power
amplifier
Table 10. Components 2
Designator
Part type
R1
110 k / 0.125 W
R4
22 k / 0.125 W
R6
Short-circuit
R7
(Vcc-Vf_led)/If_led
R8
10 k/0.125 W
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug
10.16 mm pitch
S8
3 connector 2.54 mm
pitch
P1
PCB phono jack
D1
Led 3 mm
U1
TS4890ID or TS4890IS
Application n°3: 50 Hz to 10 kHz bandwidth and 10 dB gain BTL power
amplifier
Table 11. Components 3
Designator
38/46
Part type
R1
33 k / 0.125 W
R2
Short-circuit
R4
22 k / 0.125 W
R6
Short-circuit
R7
(Vcc-Vf_led)/If_led
R8
10 k/0.125 W
C2
470 nF
C5
150 nF
C6
100 µF
DocID8396 Rev 7
TS4890
Application information
Table 11. Components 3
Designator
Part type
C7
100 nF
C9
Short-circuit
C10
Short-circuit
C12
1 µF
S1, S2, S6, S7
2 mm insulated plug
10.16 mm pitch
S8
3 connector 2.54 mm
pitch
P1
PCB phono jack
D1
Led 3 mm
U1
TS4890ID or TS4890IS
Application n°4: differential inputs BTL power amplifier
In this configuration, we need to place these components: R1, R4, R5, R6, R7, C4, C5, C12.
We have also: R4 = R5, R1 = R6, C4 = C5. The gain of the amplifier is:
R1
G VDIFF = 2 -------R4
For Vcc=5 V, a 20 Hz to 20 kHz bandwidth and 20 dB gain BTL power amplifier you could
follow the bill of material below:
Table 12. Components 4
Designator
Part type
R1
110 k / 0.125 W
R4
22 k / 0.125 W
R5
22 k / 0.125 W
R6
Short-circuit
R7
(Vcc-Vf_led)/If_led
R8
10 k/0.125 W
C4
470 nF
C5
470 nF
C6
100 µF
C7
100 nF
C9
Short-circuit
C10
Short-circuit
DocID8396 Rev 7
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46
Application information
TS4890
Table 12. Components 4
Designator
Part type
C12
1 µF
D1
Led 3 mm
S1, S2, S6, S7
2 mm insulated plug
10.16 mm pitch
S8
3 connector 2.54 mm
pitch
P1, P2
PCB phono jack
U1
TS4890ID or TS4890IS
How to use the PSRR curves
We have finished a design and we have chosen for the components:
•
Rin = Rfeed = 22 kΩ
•
Cin=100 nF
•
Cb=1 µF
Now, in Figure 16, we can see the PSRR (input grounded) vs frequenc y curves. At 217 Hz,
we have a PSRR value of -36 dB. In reality we want a value about -70dB. So, we need a
gain of 34 dB. Now, in Figure 15 we can see the effect of Cb on the PSRR (input grounded)
vs frequency. With Cb=100 µF, we can reach the -70 dB value. The process to obtain the
final curve (Cb=100 µF, Cin=100 nF, Rin=Rfeed=22 kΩ) is a simple transfer point by point
on each frequency of the curve on Figure 16 to the curve on Figure 15. The measurement
result is shown on the next figure.
Figure 109. PSRR changes with Cb
9FF DQG9
5IHHG N5LQ N
5J :5/ :
7DPE q&
3655 G%
&LQ Q)
&E P)
&LQ Q)
&E P)
)UHTXHQF\ +]
The PSRR is the power supply rejection ratio. It is a kind of SVR in a determined frequency
range. The PSRR of a device, is the ratio between a power supply disturbance and the
result on the output. We can say that the PSRR is the ability of a device to minimize the
impact of power supply disturbances to the output.
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DocID8396 Rev 7
TS4890
Application information
Figure 110. PSRR measurement schematic
9FF DQG9
5IHHG N5LQ N
5J :5/ :
7DPE q&
&LQ Q)
&E P)
3655 G%
&LQ Q)
&E P)
)UHTXHQF\ +]
Principle of operation
•
We fixed the DC voltage supply (Vcc)
•
We fixed the AC sinusoidal ripple voltage (Vripple)
•
No bypass capacitor Cs is used
The PSRR value for each frequency is:
Rms ( V ripple )
PSRR ( dB ) = 20 × Log 10 ------------------------------------------Rms ( Vs - – Vs + )
Remark: The measure of the Rms voltage is not an Rms selective measure but a full range
(2 Hz to 125 kHz) Rms measure. It means that we measure the effective Rms signal + the
noise.
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46
Package information
6
TS4890
Package information
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
6.1
SO8 package information (TS4890IDT)
Figure 111. SO8 package outline
Table 13. SO8 package mechanical data
Dimensions
Ref.
Min.
Typ.
A
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Inches(1)
Millimeters
Max.
Min.
Typ.
1.75
0.25
Max.
0.069
A1
0.1
0.004
0.01
A2
1.25
b
0.28
0.48
0.011
0.019
c
0.17
0.23
0.007
0.01
D
4.8
5
0.189
0.049
4.9
DocID8396 Rev 7
0.193
0.197
TS4890
Package information
Table 13. SO8 package mechanical data
Dimensions
Ref.
Inches(1)
Millimeters
Min.
Typ.
Max.
Min.
Typ.
Max.
E
5.8
6
6.2
0.228
0.236
0.244
E1
3.8
3.9
4
0.15
0.154
0.157
e
1.27
0.05
h
0.25
0.5
0.01
0.02
L
0.4
1.27
0.016
0.05
L1
k
ccc
1.04
0.04
0
8°
0.1
0.004
1. Values in inches are converted from mm and rounded to 4 decimal digits.
6.2
MiniSO8 package information (TS4890IST)
Figure 112. MiniSO8 package outline
DocID8396 Rev 7
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46
Package information
TS4890
Table 14. MiniSO8 package mechanical data
Dimensions
Ref.
Inches(1)
Millimeters
Min.
Typ.
A
Max.
Min.
1.1
A1
0
A2
0.75
b
Max.
0.043
0.15
0
0.95
0.03
0.22
0.4
0.009
0.016
c
0.08
0.23
0.003
0.009
D
2.8
3
3.2
0.11
0.118
0.126
E
4.65
4.9
5.15
0.183
0.193
0.203
E1
2.8
3
3.1
0.11
0.118
0.122
e
L
0.85
0.65
0.4
0.6
0.006
0.033
0.8
0.016
0.024
0.95
0.037
L2
0.25
0.01
ccc
0°
0.037
0.026
L1
k
8°
0°
0.1
1. Values in inches are converted from mm and rounded to 4 decimal digits.
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Typ.
DocID8396 Rev 7
0.031
8°
0.004
TS4890
7
Revision history
Revision history
Table 15. Document revision history
Date
Revision
15-Feb-2019
7
Changes
Removed DFN8 package. Updated the document
accordingly
DocID8396 Rev 7
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46
TS4890
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ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order
acknowledgement.
Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or
the design of Purchasers’ products.
No license, express or implied, to any intellectual property right is granted by ST herein.
Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product.
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Information in this document supersedes and replaces information previously supplied in any prior versions of this document.
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