Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsLinear ICsLinear IC - Audio amplifier Headphones (2-channel, stereo) Class AB MiniSO 8

Rev 2

November 2005 1/26

TS482

100mW Stereo Headphone Amplifier

■ Operating from Vcc=2V to 5.5V

■ 100mW into 16Ω at 5V

■ 38mW into 16Ω at 3.3V

■ 11.5mW into 16Ω at 2V

■ Switch ON/OFF click reduction circuitry

■ High power supply rejection ratio: 85dB at 5V

■ High signal-to-noise ratio: 110dB(A) at 5V

■ High crosstalk immunity: 100dB (F=1kHz)

■ Rail-to-rail input and output

■ Unity-gain stable

■ Available in SO-8, MiniSO-8 & DFN8

Description

The TS482 is a dual audio power amplifier able to

drive a 16 or 32Ω stereo headset down to low

voltages.

It is delivering up to 100mW per channel (into 16Ω

loads) of continuous average power with 0.1%

THD+N from a 5V power supply.

The unity gain stable TS482 can be configured by

external gain-setting resistors.

Applications

■ Stereo headphone amplifier

■ Optical storage

■ Computer motherboard

■ PDA, organizers & notebook computers

■ High-end TV, set-top box, DVD players

■ Sound cards

Order Codes

Typical application schematic

TS482IST - MiniSO-8

TS482ID, TS482IDT - SO-8

UT (1)

IN+ (1)

UT (2)

IN- (2)

IN+ (2)

IN- (1)

UT (1)

IN+ (1)

UT (2)

IN- (2)

IN+ (2)

IN- (1)

TS482

3.9k

100k

Vcc

220µF

Right In

Left In

RL=32Ohms

1µF

2.2µF

1µF

Cin1

Cin2

Rin1

Cout2

Cout1

Rin2

Rfeed1

Rfeed2

Rpol

TS482

3.9k

100k

Vcc

220µF

Right In

Left In

RL=32Ohms

1µF

2.2µF

1µF

Cin1

Cin2

Rin1

Cout2

Cout1

Rin2

Rfeed1

Rfeed2

Rpol

TS482IQT - DFN8

VIN + (1)

GND VIN + (2)

Vcc

OUT

(2)

OUT (1)

VIN - (2)

VIN - (1)

VIN + (1)

GND VIN + (2)

Vcc

OUT

(2)

OUT (1)

VIN - (2)

VIN - (1)

Part Number Temperature Range Package Packing Marking

TS482ID/IDT

-40, +85°C

SO-8 Tube or Tape & Reel

482ITS482IST miniSO-8

Tape & Reel

TS482IQT DFN8

www.st.com

Summary of content (26 pages)

PAGE 1
TS482 100mW Stereo Headphone Amplifier ■ Operating from Vcc=2V to 5.5V ■ 100mW into 16Ω at 5V ■ TS482ID, TS482IDT - SO-8 38mW into 16Ω at 3.3V ■ 11.
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Absolute Maximum Ratings 1 TS482 Absolute Maximum Ratings Table 1. Key parameters and their absolute maximum ratings Symbol VCC Vi Parameter Supply voltage (1) Input Voltage Value Unit 6 V -0.3 to VCC +0.3 V Toper Operating Free Air Temperature Range -40 to + 85 °C Tstg Storage Temperature -65 to +150 °C 150 °C Tj Maximum Junction Temperature Thermal Resistance Junction to Ambient Rthja 175 215 70 SO8 MiniSO8 DFN8 °C/W Power Dissipation (2) Pd 0.71 0.58 1.
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TS482 2 Electrical Characteristics Electrical Characteristics Table 3. Electrical characteristics when VCC = +5V, GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol Parameter ICC Supply Current No input signal, no load VIO Input Offset Voltage (VICM = V CC/2) IIB Input Bias Current (V ICM = VCC/2) Min. Typ. Max. Unit 5.5 7.2 1 5 mV 200 500 nA mA Output Power PO THD+N = THD+N = THD+N = THD+N = 0.1% Max, F = 1kHz, RL = 32Ω 1% Max, F = 1kHz, RL = 32Ω 0.
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Electrical Characteristics Table 4. TS482 Electrical characteristics when VCC = +3.3V, GND = 0V, Tamb = 25°C (unless otherwise specified) (1) Symbol Parameter ICC Supply Current No input signal, no load VIO Input Offset Voltage (VICM = V CC/2) IIB Input Bias Current (V ICM = VCC/2) Min. Typ. Max. Unit 5.3 7.2 1 5 mV 200 500 nA mA Output Power PO THD+N = THD+N = THD+N = THD+N = 0.1% Max, F = 1kHz, RL = 32Ω 1% Max, F = 1kHz, RL = 32Ω 0.
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Electrical Characteristics Table 5. TS482 Electrical characteristics when VCC = +2.5V, GND = 0V, Tamb = 25°C (unless otherwise specified) (2) Symbol Parameter ICC Supply Current No input signal, no load VIO Input Offset Voltage (VICM = VCC/2) IIB Input Bias Current (VICM = V CC/2) Min. Typ. Max. Unit 5.1 7.2 1 5 mV 200 500 nA mA Output Power PO THD+N THD+N THD+N THD+N = 0.1% Max, F = 1kHz, RL = 32Ω = 1% Max, F = 1kHz, RL = 32Ω = 0.
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Electrical Characteristics Table 6. TS482 Electrical characteristics when VCC = +2V, GND = 0V, Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit ICC Supply Current No input signal, no load 5 7.2 VIO Input Offset Voltage (VICM = V CC/2) 1 5 mV IIB Input Bias Current (V ICM = VCC/2) 200 500 nA mA Output Power PO THD+N = THD+N = THD+N = THD+N = 0.1% Max, F = 1kHz, RL = 32Ω 1% Max, F = 1kHz, RL = 32Ω 0.
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Electrical Characteristics Table 7. Components description Components Functional Description Rin Inverting input resistor which sets the closed loop gain in conjunction with Rfeed.
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Electrical Characteristics Table 8. TS482 Index of graphics Description Figure Page Open loop gain and phase vs. frequency response Figure 1 to10 Page 9 to10 Phase and Gain Margin vs. Power Supply Voltage Figure 11 to 20 Page 10 to12 Output power vs. power supply voltage Figure 21 to 23 Page 12 Output power vs. load resistance Figure 24 to 27 Page 12 to13 Power dissipation vs. output power Figure 28 to 31 Page 13 to14 Power derating vs.
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Electrical Characteristics 60 60 0 Gain (dB) 80 20 1 Figure 3. 10 100 Frequency (kHz) 1000 10000 Phase 80 60 40 20 -20 0 -40 0.1 -20 Open loop gain and phase vs. frequency response 1 Figure 4. 10 100 Frequency (kHz) 1000 10000 Vcc = 5V RL = 16Ω Tamb = 25°C Gain 60 180 80 160 140 Gain 60 Vcc = 2V RL = 16Ω Tamb = 25°C 80 60 0 Gain (dB) Phase Phase (Deg) Gain (dB) 20 100 40 20 20 80 60 40 20 -20 0 0 -40 0.1 1 Figure 5. 10 100 Frequency (kHz) 1000 10000 -40 0.
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Electrical Characteristics Open loop gain and phase vs. frequency response Figure 8. Open loop gain and phase vs. frequency response 180 180 Gain 60 Vcc = 5V RL = 600Ω Tamb = 25°C 80 160 140 Vcc = 2V RL = 600Ω Tamb = 25°C Gain 60 Phase 60 0 Gain (dB) 20 80 Phase (Deg) Gain (dB) 100 40 100 20 80 Phase 60 0 40 20 -20 40 20 -20 0 0 -40 0.1 1 Figure 9. 10 100 1000 Frequency (kHz) 10000 -40 0.1 -20 Open loop gain and phase vs.
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Electrical Characteristics TS482 Figure 13. Phase margin vs. power supply voltage Figure 14. Gain margin vs. power supply voltage 50 50 RL=16Ω Tamb=25°C 40 30 Gain Margin (dB) Phase Margin (Deg) 40 CL= 0 to 500pF 20 10 30 20 CL=0 to 500pF 10 RL=16Ω Tamb=25°C 0 2.0 2.5 3.0 3.5 4.0 Power Supply Voltage (V) 4.5 0 2.0 5.0 2.5 3.0 3.5 4.0 Power Supply Voltage (V) 4.5 5.0 Figure 15. Phase margin vs. power supply voltage Figure 16. Gain margin vs.
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Electrical Characteristics Figure 19. TS482 Phase margin vs. power supply voltage Figure 20. Gain margin vs. power supply voltage 70 20 CL=0pF 50 CL=0pF 40 CL=300pF Gain Margin (dB) Phase Margin (Deg) 60 CL=500pF 30 20 10 CL=200pF 10 CL=500pF RL=5kΩ Tamb=25°C RL=5kΩ Tamb=25°C 0 2.0 2.5 Figure 21. 3.0 3.5 4.0 Power Supply Voltage (V) 4.5 0 2.0 5.0 2.5 Output power vs. power supply voltage Figure 22. 3.0 3.5 4.0 Power Supply Voltage (V) 4.5 5.0 Output power vs.
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Electrical Characteristics TS482 Figure 25. Output power vs. load resistance Figure 26. Output power vs. load resistance 50 THD+N=1% 60 Output power (mW) Av = -1 Vcc = 3.3V F = 1kHz BW < 125kHz Tamb = 25°C 50 40 THD+N=10% 30 20 0 40 30 25 THD+N=10% 20 15 THD+N=0.1% 5 8 16 24 32 40 48 Load Resistance (ohm) 56 0 64 Figure 27. Output power vs.
PAGE 14
Electrical Characteristics TS482 Figure 31. Power dissipation vs. output power Figure 32. Power derating vs. ambient temperature 25 Power Dissipation (mW) Vcc=2V F=1kHz 20 THD+N<1% RL=8Ω 15 10 RL=16Ω 5 RL=32Ω 0 0 2 4 6 8 10 12 14 Output Power (mW) Figure 33. Current consumption vs. power supply voltage Figure 34. Power supply rejection ratio vs. frequency 6 80 4 Ta=85°C Ta=-40°C 3 Ta=25°C Vcc=3.3V 60 20 1 0 1 2 3 Power Supply Voltage (V) 4 0 20 5 Figure 35. THD + N vs.
PAGE 15
Electrical Characteristics TS482 Figure 37. THD + N vs. output power Figure 38. THD + N vs. output power 10 10 Vcc=2V 0.1 Vcc=2.6V Vcc=3.3V Vcc=2.6V Vcc=3.3V 0.1 Vcc=5V 1 1E-3 Vcc=5V 10 Output Power (mW) 100 Figure 39. THD + N vs. output power 0.01 0.1 Output Voltage (Vrms) 1 Figure 40. THD + N vs. output power 10 10 RL = 5kΩ F = 20Hz 1 Av = -1 BW < 125kHz Tamb = 25°C Vcc=2V Vcc=2.6V THD + N (%) THD + N (%) Vcc=2V 0.01 0.
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Electrical Characteristics TS482 Figure 43. THD + N vs. output power Figure 44. THD + N vs. output power 10 10 RL = 5kΩ F = 1kHz Av = -1 1 BW < 125kHz Tamb = 25°C Vcc=2V Vcc=2.6V THD + N (%) THD + N (%) RL = 600Ω F = 1kHz Av = -1 1 BW < 125kHz Tamb = 25°C Vcc=3.3V 0.1 Vcc=5V Vcc=3.3V Vcc=5V 0.01 1E-3 0.01 0.1 Output Voltage (Vrms) 1E-3 0.01 1 Figure 45. THD + N vs. output power Vcc=2V Vcc=2.
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Electrical Characteristics TS482 Figure 49. THD + N vs. output power Figure 50. THD + N vs. frequency 0.1 RL = 5kΩ F = 20kHz Av = -1 1 BW < 125kHz Tamb = 25°C Vcc=2V Vcc=2V, Po=10mW Vcc=2.6V, Po=20mW Vcc=3.3V, Po=40mW Vcc=5V, Po=100mW Vcc=2.6V THD + N (%) THD + N (%) 10 Vcc=3.3V Vcc=5V 0.1 RL=8Ω Av=-1 Bw < 125kHz Tamb=25°C 0.01 0.01 0.01 0.1 Output Voltage (Vrms) 1 Figure 51. THD + N vs. frequency 20 100 1000 Frequency (Hz) 10000 20k Figure 52. THD + N vs. frequency 0.1 0.
PAGE 18
Electrical Characteristics TS482 Figure 55. Signal to noise ratio vs. power Figure 56. Signal to noise ratio vs. power supply with unweighted filter (20Hz supply with unweighted filter (20Hz to 20kHz) to 20kHz) 110 110 104 102 RL=32Ω 100 98 96 RL=8Ω 94 RL=16Ω 92 90 2.0 2.5 Av = -1 THD+N < 0.2% Tamb = 25°C 108 Signal to Noise Ratio (dB) Signal to Noise Ratio (dB) Av = -1 108 THD+N < 0.2% 106 Tamb = 25°C 3.0 106 104 102 RL=600Ω 100 98 RL=5kΩ 96 94 92 3.5 4.0 4.5 90 2.0 5.0 2.5 3.
PAGE 19
Electrical Characteristics TS482 Figure 61. Crosstalk vs. frequency Figure 62. Crosstalk vs. frequency 100 100 80 ChB to ChA ChA to ChB 60 RL=8Ω Vcc=5V Pout=100mW Av=-1 Bw < 125kHz Tamb=25°C 40 20 20 100 1000 Frequency (Hz) Crosstalk (dB) Crosstalk (dB) 80 ChA to ChB 60 RL=16Ω Vcc=5V Pout=90mW Av=-1 Bw < 125kHz Tamb=25°C 40 20 10000 20k Figure 63. Crosstalk vs. frequency ChB to ChA 20 100 1000 Frequency (Hz) 10000 20k Figure 64. Crosstalk vs.
PAGE 20
Electrical Characteristics TS482 Figure 67. Lower cut off frequency vs. input capacitor Figure 68. Typical distribution of TDH + N 40 1000 Vcc=5V RL=16Ω Av=-1 Pout=90mW 20Hz≤F≤20kHz Tamb=25°C 32 Rin=10kΩ 100 Number of Units -3dB Cut Off Frequency (Hz) 36 Rin=3.9kΩ Rin=22kΩ 10 28 24 20 16 12 8 4 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 2.2 0.012 0.018 0.024 Input Capacitor Cin ( F) Figure 69. Best case distribution of THD + N 0.
PAGE 21
Electrical Characteristics TS482 Figure 73. Worst case distribution of THD + N Figure 74. Typical distribution of TDH + N 40 20 Number of Units 32 28 24 20 16 12 16 14 12 10 8 6 8 4 4 2 0 0.012 0.018 0.024 0.030 0.036 0.042 Vcc=5V RL=32Ω Av=-1 Pout=60mW 20Hz≤F≤20kHz Tamb=25°C 18 Number of Units Vcc=2V RL=16Ω Av=-1 Pout=8mW 20Hz≤F≤20kHz Tamb=25°C 36 0 0.012 0.048 0.018 0.024 THD+N (%) Figure 75.
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Electrical Characteristics TS482 Figure 79. Worst case distribution of THD + N 40 Vcc=2V RL=32Ω Av=-1 Pout=6.5mW 20Hz≤F≤20kHz Tamb=25°C 36 Number of Units 32 28 24 20 16 12 8 4 0 0.012 0.018 0.024 0.030 0.036 THD+N (%) 22/26 0.042 0.
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Package Mechanical Data 3 TS482 Package Mechanical Data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.
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Package Mechanical Data 3.
PAGE 25
Package Mechanical Data 3.
PAGE 26
Revision history 4 TS482 Revision history Date Revision June 2003 1 Initial release. 2 The following changes were made in this revision: – Lead temperature for lead-free added see Table 1: Key parameters and their absolute maximum ratings on page 2. – Formatting changes throughout. Nov. 2005 Changes Information furnished is believed to be accurate and reliable.