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Technical content
DESCRIPTION
The PT3323 is a 2-VRMS pop-free audio line driver with single power supply, which is designed to remove the output dc-blocking capacitors and reduce component numbers and cost. With 3.3V supply voltage, it is capable of driving 2 V RMS into a 10k Ω load. Meanwhile, the device ha s differential inputs and uses external gain setting resistors that supports a gain range of ±1V/V to ±10V/V. Compared the traditional methods, the PT3323 doesn't require either a power supply more than 3.3V, or a split rail power supply to generate a 5. 6Vpp output. The PT3323 contains a charge pump that generates a negative supply rail, so it supports a clean ground-biased 2-VRMS output. Furthermore, the PT3323 offers a built -in under voltage detector and mute control circuitry for optimal pop -free performance. The PT3323 is available in 14-pin TSSOP package.
FEATURES
Differential Input and Single-Ended Output Output 2-VRMS pop-free audio line driver at 10 KΩ load with 3.3V power supply Low Distortion - Low THD+N, < 0.01% (at 2 VRMS Into 10 KΩ) - High SNR, > 90 dB - Low Vn, < 11μVrms Low DC Offset, < 1.5mV No output DC-Blocking capacitors Adjustable Gain can be achieved by adjusting the external gain resistance Built-in pop and click suppression Over current protection Available in TSSOP-14 package
APPLICATIONS
Set-Top Box LCD TV or Monitor Laptop or MID Portable DVD BLOCK DIAGRAM
V1.0 2 November 2016 APPLICATION CIRCUIT +INR -INR OUTR GND MUTE VSS CN +INL -INL OUTL UVP GND VDD CP OUTR OUTL RFB RIN CIN RFB RIN CIN - + -+ RIN CIN RIN CIN RFB RFB RIGHT INPUT LEFT INPUT 1uF CP 1 uF SUPPLY SUPPLY R1R2 MUTE Differential-input, single-ended output, second-order filter RIN=15 KΩ, RFB=30 KΩ, R1=43 KΩ, C1=180pF, C2=47pF，Cp=1uF
V1.0 3 November 2016 ORDER INFORMATION Valid Part Number Package Type Top Code PT3323-TX 14-pin, TSSOP PT3323-TX PIN CONFIGURATION 1 +INR -INR OUTR GND MUTE VSS CN 8 14+INL -INL OUTL UVP GND VDD CP PIN DESCRIPTION Pin Number I/O Symbol Description
1 I +INR Right-channel positive input
2 I -INR Right-channel negative input
3 O OUTR Right-channel output
4 P GND Power Ground
5 I MUTE Mute, L=muted, H=normal
6 P VSS Supply voltage
7 I/O CN Charge-pump flying capacitor negative connection
8 I/O CP Charge-pump flying capacitor positive connection
9 P VDD Positive supply
10 P GND Power Ground
11 I UVP Undervoltage protection;
Connect to VDD with a 10KΩ resistor if function is unused.
12 O OUTL Left-channel output
13 I +INR Left channel positive input
14 I -INR Left channel negative input
V1.0 10 November 2016 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 Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw