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TS4909IQT Datasheet(PDF) 1 Page - STMicroelectronics |
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TS4909IQT Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 32 page  September 2007 Rev 8 1/32 32 TS4909 Dual mode low power 150mW stereo headphone amplifier with capacitor-less and single-ended outputs Features ■ No output coupling capacitors necessary ■ Pop-and-click noise reduction circuitry ■ Operating from VCC = 2.2V to 5.5V ■ Standby mode active low ■ Output power: – 158mW @5V, into 16 Ω with 1% THD+N max (1kHz) – 52mW @3.0V into 16 Ω with 1% THD+N max (1kHz) ■ Ultra low current consumption: 2.0mA typ.@3V ■ Ultra low standby consumption: 10nA typ. ■ High signal-to-noise ratio: 105 dB typ.@5V ■ High crosstalk immunity: 110dB (F=1kHz) for single-ended outputs ■ PSRR: 72dB (F=1kHz), inputs grounded, for phantom ground outputs ■ Low tWU: 50ms in PHG mode, 100ms in SE mode ■ Available in lead-free DFN10 3x3mm Applications ■ Headphone amplifier ■ Mobile phone ■ PDA, portable audio player Description The TS4909 is a stereo audio amplifier designed to drive headphones in portable applications. The integrated phantom ground is a circuit topology that eliminates the heavy output coupling capacitors. This is of primary importance in portable applications where space constraints are very high. A single-ended configuration is also available, offering even lower power consumption because the phantom ground can be switched off. Pop-and-click noise during switch-on and switch- off phases is eliminated by integrated circuitry. Specially designed for applications requiring low power supplies, the TS4909 is capable of delivering 31mW of continuous average power into a 32 Ω load with less than 1% THD+N from a 3V power supply. Featuring an active low standby mode, the TS4909 reduces the supply current to only 10nA (typ.). The TS4909 is unity gain stable and can be configured by external gain-setting resistors. Pin connections (top view) DFN10 (3x3) 1 2 3 4 7 10 9 8 5 6 1 2 3 4 7 10 9 8 5 6 Vin1 Vin2 Stdby Bypass SE/PHG Vdd Vout1 Vout3 Vout2 Gnd Vin1 Vin2 BIAS Gnd Vout1 Vout2 Vout3 Stdby SE/PHG Functional block diagram Bypass Vdd www.st.com |
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