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PT2309 Headphone Driver IC
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 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.
FEATURES
* * * * * CMOS Technology Stereo Input Drive 32 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: 886-66296288Fax: 886-29174598 http://www.princeton.com.tw2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT2309
APPLICATION CIRCUIT
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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 I/O O I I I I O Description CH1 Output Mute Pin CH1 Input Ground CH2 Input Bias Pin CH2 Output Power Input Pin No. 1 2 3 4 5 6 7 8
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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 0.1F to 10F.
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=10F, 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 50K impedance, so input terminal charge period constant is: Tin= (2 x 50K x Cin) If Cin=1F, 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 headphone load, it needs a larger capacitance to extending the lower frequency cut off point. If driving a small headphone a 100F capacitor is a good choice and the low frequency limit is around 50Hz; for better low frequency performance a 220F 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 (150K), 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 10F, the recommend value is 47F. Higher CB will have better mute characteristic.
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ABSOLUTE MAXIMUM RATINGS
Parameter Supply Voltage Operating Temperature Storage Temperature Maximum Input Voltage Maximum Input Current Symbol VDD Topr Tstg Vimax Iimax * Condition Min. 0 -40 -65 -0.3 -10 Max. 7 +85 +150 Vcc+0.3 +10 Unit V V mA
Note: * Input pins surge current can reach 100mA does not induce the CMOS latched up.
ELECTRICAL CHARACTERISTICS
Unless otherwise, Vcc=5VCB=47Fbandwidth=22~22KHz Parameter Symbol CONDITIONS Supply Voltage VDD Operating Current Voltage Gain Two Channels Gain Error THD+N Is Vg Vgerr THD Vin=1Vrms, RL = 32 Vin=1Vrms, RL = 5.1K THD=0.1%, RL=32 THD=0.1%, RL=16 Input=GND, A-Weighted F=1KHz F=100~20KHz Vr=100mVrms, F=100Hz MUTE=GND, F=1KHz VIH, MUTE= OFF VIL, MUTE= ON Normal Mode Mute Mode Min. 3 6 4.5 -1 -0.5 0.01 0.003 35 65 102 90 80 45 60 1 0.8 Typ. 5 7.5 6 0 0 0.03 0.005 45 75 105 100 90 55 75 1.1 0.9 Max. 6 9 7.5 +1 +0.5 0.06 0.01 55 85 110 105 95 65 80 1.4 1 Unit V mA mA dB
%
Power Output Signal-to-Noise Ratio Channel Separation Power Supply Rejection Ratio Mute Mute Voltage
Po SNR CS PSRR mute Vmute
mW dB dB dB dB Vcc
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PACKAGE INFORMATION
8 PINS, DIP, 300MIL
Symbol A A1 A2 b c e D E E1 L
Note: Refer to JEDEC MS-001 BA
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
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8 PINS, SOP, 150 MIL
Symbol A A1 A2 b c e D E E1 L
Note: Refer to JEDEC MS-012 AA
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
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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
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