Datasheet

–3
–2.5
–2
–1.5
–1
–0.5
0
0.5
1
1.5
2
0 500 1000 1500 2000 2500 3000 3500 4000
Rx_8K_1st_HPF
Specification
Rx_8K_3rd_HPF
VoiceDownlink(RX)Filter8kHz
Frequency(Hz)
Gain(dB)
032-030
TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
6.1.9.1 Voice Downlink Filter (Sampling Frequency at 8 kHz)
Figure 6-17 shows the voice downlink frequency response with F
S
= 8 kHz. Table 6-12 lists the voice filter
frequency responses relative to the reference gain at 1 kHz with F
S
= 8 kHz.
Figure 6-17. Voice Downlink Frequency Response With F
S
= 8 kHz
Table 6-12. Digital Voice Filter RX Electrical Characteristics With F
S
= 8 kHz
Parameter Test Conditions Min Typ Max Unit
Frequency response relative to reference gain at 1 kHz (first-order 100 Hz –20 dB
HPF)
200 Hz –8 –0.5
300 to 3300 Hz –0.5 0 0.5
3400 Hz –1.5 0 0.1
4000 Hz –17
4600 Hz –40
> 6000 Hz –45
Pole when third-order HPF is disabled (first-order HPF) 2.5 Hz
Group delay 0.5 ms
Copyright © 2008–2011, Texas Instruments Incorporated Audio/Voice Module 81
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