Datasheet

8 W
Ferrite chip bead
Ferrite chip bead
VBAT.RIGHT/LEFT
IHF.RIGHT/LEFT.M
GND.RIGHT/LEFT
C /C
HFR HFL
IHF.RIGHT/LEFT.P
VBAT
On board
Chip
032-018
L /L
HFR.P HFL.P
L /L
HFR.M HFL.M
C /C
HFR.P HFL.P
C /C
HFR.M HFL.M
DigitalPGA
Gain=0dB
AnalogPGA
Gain=0dB
Amp
0dB
DAC
1.5Vpp
0dBFs
032-019
TPS65950
SWCS032E–OCTOBER 2008–REVISED JANUARY 2011 www.ti.com
Figure 6-5. 8-Ω Stereo Hands-Free
NOTE
For the component values, see Table 15-1.
For ferrite bead, choose one with high impedance at high frequencies, but with very low impedance at low
frequencies. For example, MPZ1608S221A (recommended), N2012ZPS121, or MDP BKP1608HS271.
6.1.3 Headset
The analog signal from the audio and/or voice interface is fed to two single-ended headset amplifiers.
There are two configurations:
• Stereo single-ended mode: Left and right headset amplifiers with different gains (–6, 0, 6 dB) provide
the stereo signal on the HSOL and HSOR terminals. A pseudo-ground is provided on the VMID
terminal to eliminate external capacitors.
• Stereo single-ended mode ac-coupled: Left and right headset amplifiers with different gains (–6, 0, 6
dB) provide the stereo signal on the HSOL and HSOR terminals. The external capacitor is required to
eliminate the dc component of the signal.
6.1.3.1 Headset Output Characteristics
Figure 6-6 shows the headset amplifier. Table 6-3 lists the output characteristics of the headset amplifier.
Figure 6-6. Headset Amplifier
Table 6-3. Headset Output Characteristics
Parameter Test Conditions Min Typ Max Unit
Load impedance 14 16 Ω
70 Audio/Voice Module Copyright © 2008–2011, Texas Instruments Incorporated
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