PT2309 Headphone Driver IC DESCRIPTION FEATURES The PT2309 is a headphone driver IC, it can working on wide supply range. Utilizing CMOS Technology, it has very low power consumption is in stand-by mode. Total harmonic distortion is lower than 0.03% (32Ω load) and the also has low noise output. Built-in mute function can prevents popping sounds happen when power is turned ON or OFF. It is also has built-in over-temperature protection, minimum package size for space saving and suitable for small or portable products. • • • • • CMOS Technology Stereo Input Drive 32Ω impedance load Low noise, Low distortion Suppress the pop and click noise when mode changed • Built-in mute function • Available in 8 Pins, DIP or SOP Package APPLICATIONS • • • • Portable VCD/DVD CD-ROM PDA Sound Card BLOCK DIAGRAM Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan PT2309 APPLICATION CIRCUIT V1.3 2 December 2009 PT2309 ORDER INFORMATION Valid Part Number PT2309 PT2309-S Package Type 8 Pins, DIP, 300mil 8 Pins, SOP, 150mil Top Code PT2309 PT2309-S PIN CONFIGURATION PIN DESCRIPTION Pin Name OUT1 MUTE IN1 GND IN2 BIAS OUT2 VDD V1.3 I/O O I I I I O - Description CH1 Output Mute Pin CH1 Input Ground CH2 Input Bias Pin CH2 Output Power Input 3 Pin No. 1 2 3 4 5 6 7 8 December 2009 PT2309 FUNCTION DESCRIPTION POWER SUPPLY The operating voltage of PT2309 is from 3V to 5V, In general operation 5V is recommended. It should connect a modest bias capacitor nearby the power source terminal. It can improve IC stability and decrease the noise output. Suggestion value of capacitor is from 0.1µF to 10µF. POP AND CLICK SUPPRESS For normal operation, the Input/Output port of a power amplifier powered by a single supply voltage must have a stable DC bias. Each time turn on the Vcc the input/output pins will present 1/2 Vcc DC bias voltage. For blocking the DC bias flowing to another circuit, each input/output port should have a DC blocking capacitor, it will charge/discharge when power on or off, the capacitance is relative with the pop noise. In general condition to prevent the pop noise, the time constant of bypass cap (CB) on the bypass pin will be set to maximum. Higher CB value will extend the stable time, and also can suppress the noise heard when power-on. In supply voltage=5V and CB=10µF, stable time is approx 1s. The value of CB also relative with the value of the DC blocking capacitor connected in input terminal. In general condition the time constant of DC blocking capacitor should be less than CB stable time. Recommend parts values please refer to application circuit. INPUT CAPACITOR Input capacitor decide the bandwidth and charge time constant, due to there is a 50KΩ impedance, so input terminal charge period constant is: Tin= (2π × 50KΩ × Cin) If Cin=1µF, Tin=0.3s, Low frequency lower limit is 3Hz. This capacitor can use a non-polarity SMD capacitor. OUTPUT CAPACITOR The headphone driver is designed to drive 32Ω headphone load, it needs a larger capacitance to extending the lower frequency cut off point. If driving a small headphone a 100µF capacitor is a good choice and the low frequency limit is around 50Hz; for better low frequency performance a 220µF capacitor is recommended and it’s low frequency can extend to 22Hz. Due to charge/discharge time constant is shorter than CB stable time, so it will not have pop and click noise. MUTE When the mute pin is connected to the GND, all of outputs signal will be muted immediately. Connecting the external R/C components on here could prevent the power–on “POP” noises, the mute function also can be active by the external DC voltage. Due to the built-in pull down resistor (150KΩ), a larger value series resistor connecting to the mute pin may causes mute malfunction because of mute voltage divided by the resistor network. For the detailed connection description please refer to the application circuit. The attenuation of mute is relation with CB, we suggest CB must be higher then 10µF, the recommend value is 47µF. Higher CB will have better mute characteristic. V1.3 4 December 2009 PT2309 ABSOLUTE MAXIMUM RATINGS Parameter Supply Voltage Symbol VDD Operating Temperature Condition Min. 0 Max. 7 Unit V Topr -40 +85 ℃ Storage Temperature Tstg -65 +150 ℃ Maximum Input Voltage Maximum Input Current Vimax Iimax -0.3 -10 Vcc+0.3 +10 V mA * Note: * Input pins surge current can reach 100mA does not induce the CMOS latched up. ELECTRICAL CHARACTERISTICS Unless otherwise, Vcc=5V，CB=47µF，bandwidth=22~22KHz Parameter Symbol CONDITIONS Supply Voltage VDD Operating Current Min. 3 Typ. 5 Max. 6 Unit V Normal Mode 6 7.5 9 mA Mute Mode 4.5 -1 -0.5 6 0 0 7.5 +1 +0.5 mA dB Vin=1Vrms, RL = 32Ω 0.01 0.03 0.06 Vin=1Vrms, RL = 5.1KΩ 0.003 0.005 0.01 THD=0.1%, RL=32Ω 35 45 55 THD=0.1%, RL=16Ω 65 75 85 SNR Input=GND, A-Weighted 102 105 110 dB CS F=1KHz F=100~20KHz 90 80 100 90 105 95 dB PSRR Vr=100mVrms, F=100Hz 45 55 65 dB mute MUTE=GND, F=1KHz VIH, MUTE= OFF VIL, MUTE= ON 60 1 0.8 75 1.1 0.9 80 1.4 1 dB Is Voltage Gain Two Channels Gain Error Vg Vgerr THD+N THD Power Output Signal-to-Noise Ratio Channel Separation Power Supply Rejection Ratio Mute Mute Voltage V1.3 Po Vmute 5 % mW Vcc December 2009 PT2309 PACKAGE INFORMATION 8 PINS, DIP, 300MIL Symbol A A1 A2 b c e D E E1 L Min. 0.50 3.10 0.38 0.21 9.10 7.62 6.25 2.92 Dimensions (MM) Nom. 3.30 2.54 BSC 9.20 7.87 6.35 3.30 Max. 4.80 3.50 0.55 0.35 9.30 8.25 6.45 3.81 Note: Refer to JEDEC MS-001 BA V1.3 6 December 2009 PT2309 8 PINS, SOP, 150 MIL Symbol A A1 A2 b c e D E E1 L θ Min. 1.35 0.08 1.20 0.33 0.17 4.70 5.80 3.70 0.38 0° Dimensions (MM) Nom. 1.60 0.15 1.40 1.27 BSC 4.90 6.00 3.90 0.60 - Max. 1.77 0.28 1.65 0.51 0.26 5.10 6.20 4.10 1.27 8° Note: Refer to JEDEC MS-012 AA V1.3 7 December 2009 PT2309 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.3 8 December 2009