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TLV320AIC3262 Datasheet(PDF) 43 Page - Texas Instruments

Part # TLV320AIC3262
Description  Ultralow Power Stereo Audio Codec With miniDSP, DirectPath Headphone, and Stereo Class-D Speaker Amplifier
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TLV320AIC3262 Datasheet(HTML) 43 Page - Texas Instruments

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Rload
Rpop
Cc
Output
Driver
PAD
-6...+14dB
1dB steps
-6...+14dB
1dB steps
HPL
HPR
Charge
Pump (disabled)
HPVSS_Sense
VNEG
CPFCP
CPFCM
HVDD_18
CPVSS
DVDD_18
1.5...3. 6V
DVDD
DVdd
TLV320AIC3262
www.ti.com
SLAS679A – DECEMBER 2011 – REVISED SEPTEMBER 2015
10.3.4.11 Stereo Unipolar Configuration
10.3.4.11.1
Circuit Topology
The power supply hook up scheme for the unipolar configuration is shown in Figure 23. HVDD_18 terminal
supplies the positive side of the headphone amplifier. The negative side is connected to ground potential
(VNEG). It is recommended to connect the CPVDD_18 terminal to DVdd, although the charge pump must not be
enabled while the device is connected in unipolar configuration.
Figure 23. Unipolar Stereo Headphone Circuit
The left and right DAC channels are routed to the corresponding left and right headphone amplifier. This
configuration is also used to drive line-level loads. To enable cap-coupled mode, B0_P1_R31_D7 should be set
to 0. Note that the recommended range for the HVDD_18 supply in cap-coupled mode (1.65V-3.6V) is different
than the recommended range for the default ground-centered configuration (1.5V-1.95V). In cap-coupled mode
only, the Headphone output common mode can be controlled by changing B0_P1_R8_D[4:3].
10.3.4.11.2
Unipolar Turn-On Transient (Pop) Reduction
The TLV320AIC3262 headphone drivers also support pop-free operation in unipolar, ac-coupled configuration.
Because the HPL and HPR are high-power drivers, pop can result due to sudden transient changes in the output
drivers if care is not taken. The most critical care is required while using the drivers as stereo single-ended
capacitively-coupled drivers as shown in Figure 23. The output drivers achieve pop-free power-up by using slow
power-up modes. Conceptually, the circuit during power-up can be visualized as
Figure 24. Conceptual Circuit for Pop-Free Power-up
The value of Rpop can be chosen by setting register B0_P1_R11_D[1:0].
Copyright © 2011–2015, Texas Instruments Incorporated
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