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TS488IST , Pop-free 120mW stereo headphone amplifier
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TS488IQT
Pop-free 120mW stereo headphone amplifier
May 2012 Doc ID 11971 Rev 5 1/32
TS488
TS489Pop-free 120 mW stereo headphone amplifier
Datasheet − production data
Features Pop and click noise protection circuitry Operating range from VCC= 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 mmx 2 mm
DescriptionThe 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.
Applications Headphone amplifiers Mobile phones, PDAs, computer motherboards High-end TVs, portable audio players
Contents TS488-TS4892/32 Doc ID 11971 Rev 5
Contents Typical application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224.1 Power dissipation and efficiency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.2 T otal power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.3 Lower cutoff frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.4 Higher cutoff frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.5 Gain setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.6 Decoupling of the circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.7 Standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.8 Wake-up time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.9 POP performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Connecting the headphones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285.1 MiniSO-8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 DFN8 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
TS488-TS489 Typical application schematic
Doc ID 11971 Rev 5 3/32 Typical application schematic
Figure 1. Typical application for the TS488-TS489
Table 1. Application component information
Absolute maximum ratings and operating conditions TS488-TS489
4/32 Doc ID 11971 Rev 5 Absolute maximum ratings and operating conditions
Table 2. Absolute maximum ratings All voltage values are measured with respect to the ground pin. Pdiss is calculated with Tamb= 25 °C, Tj= 150 °C. Attention must be paid to continuous power dissipation (VDD 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.
Table 3. Operating conditions The minimum current consumption (ISTBY) is guaranteed at GND (TS488) or VCC (TS489) for the whole
temperature range. When mounted on a 4-layer PCB.
TS488-TS489 Electrical characteristics
Doc ID 11971 Rev 5 5/32
3 Electrical characteristics
Table 4. Electrical characteristics at VCC =+5 V
with GND= 0 V, Tamb= 25 °C (unless otherwise specified) Guaranteed by design and evaluation.
Electrical characteristics TS488-TS489
6/32 Doc ID 11971 Rev 5
Table 5. Electrical characteristics at VCC =+3.3 V
with GND= 0 V, Tamb= 25 °C (unless otherwise specified) (1) All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. Guaranteed by design and evaluation.
TS488-TS489 Electrical characteristics
Doc ID 11971 Rev 5 7/32
Table 6. Electrical characteristics at VCC =+2.5 V
with GND= 0 V, Tamb= 25 °C (unless otherwise specified) Guaranteed by design and evaluation.
Electrical characteristics TS488-TS489
8/32 Doc ID 11971 Rev 5
Table 7. Index of graphics
TS488-TS489 Electrical characteristics
Doc ID 11971 Rev 5 9/32
Figure 2. Open-loop frequency response Figure 3. Open-loop frequency response
Figure 4. Open-loop frequency response Figure 5. Open-loop frequency response
Figure 6. Open-loop frequency response Figure 7. Open-loop frequency response
Electrical characteristics TS488-TS489
10/32 Doc ID 11971 Rev 5
Figure 8. Open-loop frequency response Figure 9. Open-loop frequency response
Figure 10. Open-loop frequency response Figure 11. Open-loop frequency response
Figure 12. Power derating curves Figure 13. Power derating curves
TS488-TS489 Electrical characteristics
Doc ID 11971 Rev 5 11/32
Figure 14. Signal-to-noise ratio vs. power
supply voltage
Figure 15. Signal-to-noise ratio vs. power
supply voltage
Figure 16. Signal-to-noise ratio vs. power
supply voltage
Figure 17. Signal-to-noise ratio vs. power
supply voltage
Figure 18. Signal-to-noise ratio vs. power
supply voltage
Figure 19. Signal-to-noise ratio vs. power
supply voltage
Electrical characteristics TS488-TS489
12/32 Doc ID 11971 Rev 5
Figure 20. Power dissipation vs. output power
per channel
Figure 21. Power dissipation vs. output power
per channel
Figure 22. Power dissipation vs. output power
per channel
Figure 23. Power supply rejection ratio vs.
frequency
Figure 24. Power supply rejection ratio vs.
frequency
Figure 25. Power supply rejection ratio vs.
frequency
TS488-TS489 Electrical characteristics
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Figure 26. Total harmonic distortion plus
noise vs. output power
Figure 27. Total harmonic distortion plus
noise vs. output power
Figure 28. Total harmonic distortion plus
noise vs. output power
Figure 29. Total harmonic distortion plus
noise vs. output power
Figure 30. Total harmonic distortion plus
noise vs. output power
Figure 31. Total harmonic distortion plus
noise vs. output power
Electrical characteristics TS488-TS489
14/32 Doc ID 11971 Rev 5
Figure 32. Total harmonic distortion plus
noise vs. output power
Figure 33. Total harmonic distortion plus
noise vs. output power
Figure 34. Total harmonic distortion plus
noise vs. output power
Figure 35. Total harmonic distortion plus
noise vs. output power
Figure 36. Total harmonic distortion plus
noise vs. output power
Figure 37. Total harmonic distortion plus
noise vs. output power
TS488-TS489 Electrical characteristics
Doc ID 11971 Rev 5 15/32
Figure 38. Total harmonic distortion plus
noise vs. output power
Figure 39. Total harmonic distortion plus
noise vs. output power
Figure 40. Total harmonic distortion plus
noise vs. output power
Figure 41. Total harmonic distortion plus
noise vs. output power
Figure 42. Total harmonic distortion plus
noise vs. output power
Figure 43. Total harmonic distortion plus
noise vs. output power
Electrical characteristics TS488-TS489
16/32 Doc ID 11971 Rev 5
Figure 44. Total harmonic distortion plus
noise vs. frequency
Figure 45. Total harmonic distortion plus
noise vs. frequency
Figure 46. Total harmonic distortion plus
noise vs. frequency
Figure 47. Total harmonic distortion plus
noise vs. frequency
Figure 48. Total harmonic distortion plus
noise vs. frequency
Figure 49. Total harmonic distortion plus
noise vs. frequency
