TLV320AIC3268_15 Datasheet, PDF (246/263 Pages) Texas Instruments – TLV320AIC3268 Low Power Stereo Audio Codec With 105dB DAC, DirectPath Headphone and Class-D Speaker Amplifier and Integrated miniDSP

TLV320AIC3268
SLAS953A – JANUARY 2014 – REVISED FEBRUARY 2014
www.ti.com
Typical Applications (continued)
For high fidelity playback, the cutoff frequency of the resultant high-pass filter should be kept low. For example
with R_L of 10kΩ, using 1µF coupling capacitor results in a cut-off frequency of 8Hz.
For differential lineout configurations, the load should be directly connected between the differential outputs, with
no coupling capacitor.
The TLV320AIC3268 supports headphone in single-ended configuration and drives the signal biased around
ground. The headphone load can be directly connected between device terminals and ground.
The TLV320AIC3268 supports BTL load for receiver and speaker amplifier. The load can be directly connected
between the differential output terminals of receiver and speaker amplifier.
Whenver any of the analog output terminals LOL, LOR, RECP, RECM, HPL, HPR, SPKP or SPKM are not used
in an application, they should be left open or not connected.
9.2.2.3 EMI Passive Devices
The TLV320AIC3268 does not need filters for the functioning of it's speaker amplifier.
However depending on the board layout and system level EMI requirements, an optional EMI filter consisting of
ferrite beads and capacitors may be used as shown in and and labelled as optional. The ferrite beads if used
should be capable of handing peak currents for desired power delivery into speakers. If EMI passives are not
used, ferrite bead should be replaced with a short and the capacitor not installed.
9.2.3 Application Performance Plots
Figure 112 shows the excellent low-distortion performance of the TLV320AIC3268 in a system over the 20Hz to
20kHz audio spectrum.
±10
±30
±50
±70
±90
±110
20
200
2000
20000
Frequency (Hz)
C014
Conditions: Differential Lineout, R_load=10kΩ, CM=0.9V, Input Amplitude=-3dBFS
Figure 112. Total Harmonic Distortion + Noise versus Input Frequency
Figure 113 shows the distortion performance of the TLV320AIC3268 in a system over the input amplitude range.
246 Submit Documentation Feedback
Product Folder Links: TLV320AIC3268
Copyright © 2014, Texas Instruments Incorporated