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TS4871IQT Folha de dados(PDF) 4 Page - STMicroelectronics |
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TS4871IQT Folha de dados(HTML) 4 Page - STMicroelectronics |
4 / 28 page TS4871 4/28 ELECTRICAL CHARACTERISTICS VCC = 2.6V, GND = 0V, Tamb = 25°C (unless otherwise specified) REMARKS 1. All measurements, except PSRR measurements, are made with a supply bypass capacitor Cs = 100µF. 2. External resistors are not needed for having better stability when supply @ Vcc down to 3V. By the way, the quiescent current remains the same. 3. The standby response time is about 1µs. Symbol Parameter Min. Typ. Max. Unit ICC Supply Current No input signal, no load 5.5 8 mA ISTANDBY Standby Current 1) No input signal, Vstdby = Vcc, RL = 8 Ω 1. Standby mode is actived when Vstdby is tied to Vcc 10 1000 nA Voo Output Offset Voltage No input signal, RL = 8 Ω 520 mV Po Output Power THD = 1% Max, f = 1kHz, RL = 8 Ω 260 mW THD + N Total Harmonic Distortion + Noise Po = 200mW rms, Gv = 2, 20Hz < f < 20kHz, RL = 8 Ω 0.15 % PSRR Power Supply Rejection Ratio2) f = 217Hz, RL = 8 Ω, RFeed = 22KΩ, Vripple = 200mV rms 2. Dynamic measurements - 20*log(rms(Vout)/rms(Vripple)). Vripple is the surimposed sinus signal to Vcc @ f = 217Hz 75 dB Φ M Phase Margin at Unity Gain RL = 8Ω, CL = 500pF 70 Degrees GM Gain Margin RL = 8Ω, CL = 500pF 20 dB GBP Gain Bandwidth Product RL = 8Ω 2MHz 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 to cut the high frequency (low pass filter cut-off frequency 1 / (2 x Pi x Rfeed x Cfeed)) Rstb Pull-up resistor which fixes the right supply level on the standby pin Gv Closed loop gain in BTL configuration = 2 x (Rfeed / Rin) |
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