參數(shù)資料
型號： TLV320AIC22PT
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： ROHS COMPLIANT, PLASTIC, LQFP-48
文件頁數(shù)： 48/55頁
文件大小： 782K
代理商： TLV320AIC22PT
TLV320AIC22
DUAL VOIP CODEC
SLAS281B – JULY 2000 – REVISED JUNE 2002
52
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
TLV320AIC22 DAC path-clipping avoidance
If large signals are input to either codec’s DAC at the DIN pin, internal clipping of the signals can occur. The result
is undesired signal distortion at the analog output of each DAC. To avoid signal distortion induced by clipping
in the TLV320AIC22 DAC path, the following is recommended:
1.
For linear operation:
D Always reduce the DAC signal input levels by 6 dB for each codec. This will ensure that large signals
approaching digital full-scale amplitude will not cause clipping.
D Program each codec’s internal programmable gain amplifier (PGA) for the desired overall channel gain,
plus 6 dB. The PGA for codec 1 is programmed via control register 3. The PGA for codec 2 is programmed
via control register 8.
Examples are provided in Table 16.
Table 16. Examples of Signal Attenuation and PGA Gain Settings
for Various Overall Channel Gains
OVERALL DESIRED
CHANNEL GAIN
INPUT LEVEL BEFORE
–6-dB APPLICATION
INPUT LEVEL AFTER
–6-dB APPLICATION
PGA GAIN
0 dB
–6 dB
6 dB
0 dB
–6 dB
–12 dB
6 dB
–27 dB
0 dB
–6 dB
–21 dB
–27 dB
–12 dB
–18 dB
–21 dB
2.
PCM companded (
-Law or A-Law) operation:
Because
-Law and A-Law transmission levels often are referenced in terms of dBm0, receive channel-input
levels limits can be noted in terms of dBm0. The signal-level 0 dBm0 is the digital milliwatt transmission level,
as addressed in the International Telecommunication Union (ITU) specification G.711. The ITU G.711
specification also shows the theoretical load capacity of the A-Law as 3.14 dBm0 and 3.17 dBm0 for the
-Law.
D Fundamentally, apply the same procedure as outlined in step 1 for linear operation.
D When using terms of dBm0, restrict A-Law signal levels to –2.88 dBm0 and -Law signal levels to
–3.02 dBm0 signal levels. These levels correspond to A-Law and
-Law to linear mapping codes that reflect
a 6-dB or greater reduction in signal level.
performance issues associated with the recommended action to avoid signal clipping in the
TLV320AIC22
The recommended action requires the attenuation of input signals by 6 dB prior to input to either codec’s DAC
on the device. The internal DAC path PGA should be programmed so that the desired channel gain and recovery
of the 6-dB input signal attenuation is accomplished. Loss of a least significant bit (LSB) of information is typical
by attenuating digital signals by 6 dB and can result in degraded signal-to-noise (SNR) performance. For the
TLV320AIC22 DAC path, the recommended action described above to avoid signal clipping results in
degradation of SNR performance typically less than 0.5 dB for signals larger than 5 LSBs and less than 2 dB
for signals larger than 2 LSBs.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TLV320AIC22PTR 功能描述:接口—CODEC DUAL VOIP CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
TLV320AIC23 制造商:TI 制造商全稱:Texas Instruments 功能描述:STereo Audio CODEC, 8- to 96kHz, With Integrated Headphone Amplifier
TLV320AIC23_06 制造商:TI 制造商全稱:Texas Instruments 功能描述:Stereo Audio CODEC, 8-to 96-kHz, With Integrated Headphone Amplifier
TLV320AIC23B 制造商:TI 制造商全稱:Texas Instruments 功能描述:Stereo Audio CODEC, 8-to 96-kHz, With Integrated Headphone Amplifier
TLV320AIC23B_06 制造商:TI 制造商全稱:Texas Instruments 功能描述:Stereo Audio CODEC, 8-to 96-kHz, With Integrated Headphone Amplifier
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