Datasheet

GAIN CONTROL
High Output Impedance
+
–
VideoBuffer/Amp
(i.e:THS7375)
TPA6135A2
75 W
OUTR
OUTL
TPA6135A2
SLOS623A – FEBRUARY 2009 – REVISED APRIL 2009 .................................................................................................................................................. www.ti.com
The TPA6135A2 has two gain settings which are controlled with the GAIN pin. The following table gives an
overview of the gain function.
GAIN VOLTAGE AMPLIFIER GAIN
≤ 0.6 V 0 dB
≥ 1.3 V 6 dB
Table 1. Windows Vista™ Premium Mobile Mode Specifications
Windows Premium Mobile Vista
Device Type Requirement TPA6135A2 Typical Performance
Specifications
THD+N ≤ – 65 dB FS [20 Hz, 20 kHz] – 75 dB FS [20 Hz, 20 kHz]
Analog Speaker Line Jack
Dynamic Range with Signal
(R
L
= 10 k Ω , FS = 0.707 ≤ – 80 dB FS A-Weight – 100 dB FS A-Weight
Present
Vrms)
Line Output Crosstalk ≤ – 60 dB [20 Hz, 20 kHz] – 90 dB [20 Hz, 20 kHz]
THD+N ≤ – 45 dB FS [20 Hz, 20 kHz] – 65 dB FS [20 Hz, 20 kHz]
Analog Headphone Out Jack
Dynamic Range with Signal
(R
L
= 32 Ω , FS = 0.300 ≤ – 80 dB FS A-Weight – 94 dB FS A-Weight
Present
Vrms)
Headphone Output Crosstalk ≤ – 60 dB [20 Hz, 20 kHz] – 90 dB [20 Hz, 20 kHz]
The TPA6135A2 has a HI-Z control pin that increases output impedance while mutting the amplifier. Apply a
voltage greater than 1.3 V to the HI-Z and EN pin to activate the HI-Z mode. This feature allows the headphone
output jack to be shared for other functions besides audio. For example, sharing of a headphone jack between
audio and video as shwon in Figure 26 . The TPA6135A2 output impedance is high enough to prevent
attenuating the video signal.
Maximum
External Voltage
Enable Voltage HI-Z Voltage Output Impedance Comments
Applied to the
Output Pins
≤ 0.6 V ≤ 0.6 V 20 Ω – 30 Ω
– 0.3 V to 3.3 V
(1)
Shutdown Mode
≤ 0.6 V ≥ 1.3 V 20 Ω – 30 Ω
≥ 1.3 V ≤ 0.6 V ≤ 1 Ω – Active Mode
40 k Ω @ 10 kHz
≥ 1.3 V ≥ 1.3 V 4.5 k Ω @ 1 MHz – 1.8 V to 1.8 V HI-Z Mode
750 Ω @ 10 MHz
(1) If V
DD
is < 3.3 V, then maximum allowed external voltage applied is V
DD
in this mode
Figure 26. Sharing One Connector Between Audio and Video Signals Example
12 Copyright © 2009, Texas Instruments Incorporated
Product Folder Link(s) :TPA6135A2