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參數資料
型號: TPS65950ZXNT
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA209
封裝: 7 X 7 MM, 0.40 MM PITCH, PLASTIC, BGA-209
文件頁數: 147/167頁
文件大小: 2566K
代理商: TPS65950ZXNT
6.1.9
Digital Voice Filter Module
Low-pass
filter
Digital
modulator
Randomizer
High-pass
filter
Voiceinterface
DAC
032-029
6.1.9.1 Voice Downlink Filter (Sampling Frequency at 8 kHz)
–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
VoiceDownlink(RX)Filter8kHz
Frequency(Hz)
Gain(dB)
032-030
TPS65950
Integrated Power Management/Audio Codec
SWCS032 – OCTOBER 2008
www.ti.com
Table 6-11. Digital Audio Filter RX Electrical Characteristics
Parameter
Conditions
Min(1)
Typ(2)
Max(3)
Unit
Passband
0.42
FS
Passband ripple
0 to 0.42FS
(4)
–0.25
0.1
0.25
dB
Stopband
0.6
FS
Stopband attenuation
F = 0.6FS
(4) to 0.8F
S
(4)
60
75
dB
Group delay
15.8/FS
(4)
s
Linear phase
–1.4
1.4
°
(1)
Min = Minimum value
(2)
Typ = Typical value
(3)
Max = Maximum value
(4)
FS is the sampling frequency (8, 11.025, 12, 16, 22.05, 24, 32, 44.1, or 48 kHz).
Figure 6-16 shows the digital voice filter downlink full path characteristics for the voice interface.
Figure 6-16. Digital Voice Filter Downlink Path Characteristics
The global HPF or only the third-order HPF can be bypassed (when the third-order HPF is skipped, the
first-order HPF remains active).
Figure 6-17 shows the voice downlink frequency response with FS = 8 kHz. Table 6-12 lists the voice filter
frequency responses relative to the reference gain at 1 kHz with FS = 8 kHz.
Figure 6-17. Voice Downlink Frequency Response With FS = 8 kHz
80
Audio/Voice Module
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