PT2309_09 PTC | Alldatasheet

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Technical content

Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan

DESCRIPTION

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% (32 Ω 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 protecti on, minimum package size for space saving and suitable for small or portable products.

APPLICATIONS

  • Portable VCD/DVD
  • CD-ROM
  • PDA
  • Sound Card

FEATURES

  • CMOS Technology
  • Stereo Input
  • Drive 32 Ω 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 BLOCK DIAGRAM

V1.3 December 2009 APPLICATION CIRCUIT

V1.3 December 2009 ORDER INFORMATION Valid Part Number Package Type Top Code PT2309 8 Pins, DIP, 300mil PT2309 PT2309-S 8 Pins, SOP, 150mil PT2309-S PIN CONFIGURATION PIN DESCRIPTION Pin Name I/O Description Pin No. OUT1 O CH1 Output 1 MUTE I Mute Pin 2 IN1 I CH1 Input 3 GND - Ground 4 IN2 I CH2 Input 5 BIAS I Bias Pin 6 OUT2 O CH2 Output 7 VDD - Power Input 8

V1.3 December 2009 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 noi se. 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 suppl y 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 char ge time constant, due to there is a 50K Ω 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 32 Ω headphone load, it needs a larger c apacitance to extending the lower frequency cut off point. If driving a small headphone a 100µF capac itor 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 output s signal will be muted immediat ely. 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 attenuat ion 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 December 2009 ABSOLUTE MAXIMUM RATINGS Parameter Symbol Condition Min. Max. Unit Supply Voltage VDD 0 7 V Operating Temperature Topr -40 +85 ℃ Storage Temperature Tstg -65 +150 ℃ Maximum Input Voltage Vimax -0.3 Vcc+0.3 V Maximum Input Current Iimax * -10 +10 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 Min. Typ. Max. Unit Supply Voltage VDD 3 5 6 V Normal Mode 6 7.5 9 mA Operating Current Is Mute Mode 4.5 6 7.5 mA Voltage Gain Vg -1 0 +1 dB Two Channels Gain Error Vgerr -0.5 0 +0.5 Vin=1Vrms, RL = 32Ω 0.01 0.03 0.06 THD+N THD Vin=1Vrms, RL = 5.1KΩ 0.003 0.005 0.01 THD=0.1%, RL=32Ω 35 45 55 Power Output Po THD=0.1%, RL=16Ω 65 75 85 mW Signal-to-Noise Ratio SNR Input =GND, A-Weighted 102 105 110 dB F=1KHz 90 100 105 Channel Separation CS F=100~20KHz 80 90 95 dB Power Supply Rejection Ratio PSRR Vr=100mVrms, F=100Hz 45 55 65 dB Mute mute MUTE=GND, F=1KHz 60 75 80 dB VIH, MUTE= OFF 1 1.1 1.4 Mute Voltage Vmute VIL, MUTE= ON 0.8 0.9 1 Vcc

V1.3 December 2009

PACKAGE INFORMATION

8 PINS, DIP, 300MIL

Dimensions (MM) Symbol Min. Nom. Max. A - - 4.80 A1 0.50 - - A2 3.10 3.30 3.50 b 0.38 - 0.55 c 0.21 - 0.35 e 2.54 BSC D 9.10 9.20 9.30 E 7.62 7.87 8.25 E1 6.25 6.35 6.45 L 2.92 3.30 3.81 Note: Refer to JEDEC MS-001 BA

V1.3 December 2009

8 PINS, SOP, 150 MIL

Dimensions (MM) Symbol Min. Nom. Max. A 1.35 1.60 1.77 A1 0.08 0.15 0.28 A2 1.20 1.40 1.65 b 0.33 - 0.51 c 0.17 - 0.26 e 1.27 BSC D 4.70 4.90 5.10 E 5.80 6.00 6.20 E1 3.70 3.90 4.10 L 0.38 0.60 1.27 θ 0° - 8° Note: Refer to JEDEC MS-012 AA

V1.3 December 2009 IMPORTANT NOTICE Princeton Technology Corporation (PTC ) reserves the right to make co rrections, 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