PT2301 PTC | Alldatasheet

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Technical content

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2301 V1.4 - 1 - April, 2006

1 Watt Audio Power Amplifier PT2301

DESCRIPTION

The PT2301 is an integration audio power amplifier IC utilizing advanced CMOS technology. Supports 2 mono MIC input and 2 stereo line input, input gain of each amp can be set individually to meet customers’ needs. Built-in digital controlled volumes have 49 steps from +15dB ~ -90dB and all the functions can be controlled via I2C bus. In the output section, the PT2301 is equipped with both stereo headphone driver and mono speaker amp maximum output up to 1 watt. The PT2301 also equipped “Energy Save” power management systems; user can turn off the unused portion to minimize total power consumption for extended battery endurance. For different applications, the headphone section of the PT2301 has two mode types for different purposes, A-type (Output Capacitor-less) or B-type (Output with Capacitor).

FEATURES

  • 1W (8 Ω) mono channel speaker driver + stereo headphone driver
  • Digital controlled volume (49 steps /+15dB ~ -90dB)
  • 2 mono microphone inputs, 1 microphone output
  • 2 stereo line input
  • Input gain can be setting individually in each input port.
  • Eliminate DC block capacitor in the headphone driver output (Only PT2301-A supported)
  • Standby mode and Mute function
  • Thermal shutdown protection circuit
  • Energy Save function
  • Very low “POP” noise during function changed.
  • Wide operation voltage range: 2.7V ~ 5.5V
  • Low Distortion: earphone output < 0.05%, speaker output< 0.04%
  • Available in 24 Pin, space saving TSSOP Package

APPLICATIONS

  • Electronic dictionary
  • Translator
  • PDA
  • DSC (Digital Still Camera)
  • GPS

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2301 V1.4 - 2 - April, 2006 /SHUTDOWN ROUT VP217 SP-18 LOUT SP+20 VP121 HP_SENSE MIC_SENSE24 6SDA VCC MIC2 MICOUT REF PT2301-B 10L2R L1R 11 MIC1 VSS2 SCL 5 1L1L L2L 2 NC19

15 VSS1

/SHUTDOWN ROUT VP217 SP-18 LOUT SP+20 VP121 MIC_SENSE HP_SENSE

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2301 V1.4 - 3 - April, 2006 APPLICATION CIRCUIT I (PT2301-A) 8 ohm Headphone Jack /SHUTDOWN 4.7K R3 10K R4 10K RL1 24K RL2 24K SDA SCL RR1 24K RR2 24K L2R L1R C5 1uF C4 1uF 100uF L2L L1L VCC C7 1uF C6 1uF Microphone Jack Internal MIC IN MIC OUT MIC IN External C8 1uF C2 1uF C9 1uF PT2301-A /SHUTDOWN 1uF Cb L2R REF L1R MICOUT MIC2 VCC 15VSS1 MUTE 13 SP- VP2 ROUT 16 MUTE 100uF VCC MIC_SENSE HP_SENSE2 MIC1 SCL SDA VSS2 L2L L1L 22LOUT VP1 SP+ VEE VCC 4.7K Cb1 10uF VCC 100uF Notes 1. The (+) polarity of DC block capacitor installed in the I/O pin of the PT2301 should face towards the higher potential. 2. HP_SENSE (Pin 23) must be connected to Pin22 LOUT. 3. The gain setting resistors (R3、R4、RL1、RL2、RR1、RR2 ) should keep as close as possible with the PT2301 chip to prevent pick up noises. 4. DO NOT CONNECT HEADPHONE COMMON (VEE) TO OTHER AUDIO EQUIPMENT! THIS MAY CAUSES IC DAMAGE.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2301 V1.4 - 4 - April, 2006 APPLICATION CIRCUIT II (PT2301-B) VCC /SHUTDOWN 8 ohm RR2 24K RR1 24K SCL SDA RL2 24K RL1 24K R4 10K R3 10K L2R L1R C5 1uF C4 1uF 100uF L2L L1L VCC C6 1uF C7 1uF Microphone Jack MIC OUT Internal MIC IN External MIC IN C2 1uF C8 1uF C9 1uF PT2301-B /SHUTDOWN 1uF Cb L2R REF L1R MICOUT MIC2 VCC 15VSS1 MUTE 13 VP2 SP- ROUT 16 MUTE 100uF VCC HP_SENSE MIC_SENSE MIC1 SCL SDA VSS2 L2L L1L C11 22LOUT NC SP+ VP1 C12 300uF 300uF 4.7K 10K 10K VCC 4.7K 100uF Headphone Jack R9 1K R10 1K 10uF Cb1 VCC Notes 1. The (+) polarity of DC block capacitor installed in the I/O pin of the PT2301 should face towards the higher potential. 2. The gain setting resistors (R3、R4、RL1、RL2、RR1、RR2 ) should be kept as close as possible with the PT2301 chip to prevent pick up noises.

Tel: 886-2-66296288 Fax: 886-2-29174598 URL: http://www.princeton.com.tw PT2301 V1.4 - 5 - April, 2006 Valid Part Number Package Type Top Code PT2301-A 24 Pins, TSSOP, 173mil PT2301-A PT2301-B 24 Pins, TSSOP, 173mil PT2301-B