Datasheet

HPL_IN
HPL_OUT
S0490-01
V
OUT
V
IN
R
1
R
2
TAS5717
TAS5719
SLOS655A –NOVEMBER 2010– REVISED FEBRUARY 2011 www.ti.com
USING HEADPHONE AMPLIFIER IN TAS5717
This device has a stereo output which can be used as a line driver or a headphone driver that can output 2-Vrms
stereo. An audio system can be set up for different applications using this device.
Case 1 – Headphone (HP)/Line Drive With Analog Input:
The device can be represented as shown in Figure 46: analog inputs (single-ended) as HPL_IN (pin 1) and
HPR_IN (pin 4) with the outputs HPL_OUT (pin 2) and HPR_OUT (pin 3).
Figure 46. Headphone/Line Driver with Analog Input
HP_SD pin can be used turn ON/OFF the headphone amplifier/line driver.
Speaker channels are independent of headphone/line driver in this mode.
Case 2 – Headphone With I
2
S Input:
Hardware setup: The HP_PWML and HP_PWMR signals should be fed into a low-pass filter (LPF), and the
output of the LPF is fed to analog inputs (HPL_IN and HPR_IN). The A_SEL pin has a 15-kΩ pulldown to ground
and should be routed to headphone amplifier enable (HP_SDZ pin 33).
Software setup: Write to register 0x05 bits D4 = 1, D1 = 1, and D0 = 1 (13 hex). When D4 and D1 are set to 1,
the A_SEL pin goes high and thus enables the headphone output. When register 0x05 D4 = 1, the device is in
headphone mode and the speaker outputs are in shutdown.
NOTE: The speaker and headphone cannot be used at the same time as they both share the same digital
channel. DAP can be used for headphone volume.
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Product Folder Link(s): TAS5717 TAS5719