TLV320AIC3204_17 Datasheet, PDF (41/53 Pages) Texas Instruments – Ultra Low Power Stereo Audio Codec

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Typical Application (continued)
TLV320AIC3204
SLOS602C – SEPTEMBER 2008 – REVISED NOVEMBER 2014
Signal Connector
R1
Cc
R2
Device Analog Input
Req
Figure 23. Analog Input Connection With Resistor Divider Network
Whenever any of the analog input terminals IN1_L, IN2_L, IN3_L, IN1_R, IN2_R or IN3_R are not used in an
application, it is recommended to short the unused input terminals together (if convenient) and connect them to
ground using a small capacitor (example 0.1 µF).
11.2.2.2 Analog Output Connection
The line outputs of the TLV320AIC3204 drive a signal biased around the device common mode voltage. To avoid
loading the common mode with the load, it is recommended to connect the single-ended load through an ac-
coupling capacitor. The ac-coupling capacitor in combination with the load impedance forms a high pass filter.
F_c = 1/(2 x π x R_LC_c)
(7)
C_c = 1/(2 x π x R_LF_c)
(8)
For high fidelity playback, the cutoff frequency of the resultant high-pass filter should be kept low. For example
with R_L of 10 kΩ, using 1-µF coupling capacitor results in a cut-off frequency of 8 Hz.
For differential lineout configurations, the load should be directly connected between the differential outputs, with
no coupling capacitor.
Whenever any of the analog output terminals LOL, LOR, HPL or HPR are not used in an application, they should
be left open or not connected.
Copyright © 2008–2014, Texas Instruments Incorporated
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