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| 型號： | UDA1380TT |
| 元件分類： | 通用總線功能 |
| 英文描述： | Stereo audio coder-decoder for MD, CD and MP3 |
| 中文描述： | 立體聲音頻編碼器，可用于MD，CD和MP3解碼器 |
| 文件頁數(shù)： | 15/68頁 |
| 文件大小： | 278K |
| 代理商： | UDA1380TT |
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2002 Sep 16
15
Philips Semiconductors
Product specification
Stereo audio coder-decoder
for MD, CD and MP3
UDA1380
8.4
Interpolation filter (DAC)
The interpolation digital filter interpolates from 1 to 64f
s
or
to 128f
s
, by cascading FIR filters, see Table 4. The
interpolator is equipped with several sound features like
volume control, mute, de-emphasis and tone control.
Table 4
Interpolation filter characteristics
8.4.1
DIGITAL MUTE
Muting the DAC will result in a cosine roll-off soft mute,
using 4
×
32 = 128 samples in normal mode (or 3 ms at
44.1 kHz sampling frequency). The cosine roll-off curve is
illustrated in Fig.8. These cosine roll-off functions are
implementedforboththedigitalmixerandthemastermute
inside the DAC data path, see Section 8.8.
8.4.2
S
OUND FEATURES
In addition, there are basic sound features:
dB-linear volume control using 14-bit coefficients in
steps of 0.25 dB: range 0 to
78 dB maximum
suppression and
∞
dB: applies to both master volume
and mixing volume control
De-emphasis for 32, 44.1, 48 and 96 kHz for both
channel 1 and 2 (selectable independently)
Treble, which is selectable gain for high frequencies
(positive gain only), the edge frequency of the treble is
fixed (depends on the sampling frequency). Can be set
for left and right independently:
– Two settings: f
c
= 1.5 kHz and f
c
= 3 kHz, assuming
sampling frequency is 44.1 kHz
– Both settings have 0 to 6 dB gain range in steps
of 2 dB
Bass boost, which is selectable gain for low frequencies
(positive gain only). The edge frequency of the bass
boost is fixed and depends on the sampling frequency.
Can be set for left and right independently:
– Two settings: f
c
= 250 Hz and f
c
= 300 Hz, assuming
sampling frequency is 44.1 kHz
– First setting: 0 to 18 dB gain range in steps of 2 dB
– Second setting: 0 to 24 dB gain range in
steps of 2 dB.
8.5
Noise shaper
The noise shaper consists of two mono 3rd-order noise
shapers and one time-multiplexed stereo 5th-order noise
shaper.
The order of the noise shaper can be chosen between
3rd-order (which runs at 128f
s
) and 5th-order (which runs
at 64f
s
) via bit SEL_NS in the L3-bus or I
2
C-bus register.
The preferable choice for the noise shaper order is:
3rd-order noise shaper is preferred at low sampling
frequencies, for instance between 8 and 32 kHz. This is
for preventing out-of-band noise from the noise shaper
to move into the audio band
5th-order noise shaper is normally used at higher
sampling frequencies, normally from 32 to 100 kHz.
The noise shaper shifts in-band quantization noise to
frequencieswellabovetheaudioband.Thisnoiseshaping
technique enables high signal-to-noise ratios to be
achieved. The noise shaper output is converted into an
analog signal using an FSDAC.
ITEM
CONDITION
VALUE (dB)
±
0.025
60
>135
Pass-band ripple
Stop band
Dynamic range
0 to 0.45f
s
>0.55f
s
0 to 0.45f
s
handbook, halfpage
mute
factor
0
10
5
15
25
0
0.8
MGU119
20
0.6
0.4
0.2
t (ms)
Fig.8
Mute as a function of raised cosine roll-off,
displayed assuming 44.1 kHz.
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| UDA1384 | Multichannel audio coder-decoder |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UDA1380TT/N2 | 制造商:PHILIP 功能描述: |
| UDA1380TT/N2,512 | 功能描述:接口—CODEC SSA CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率: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 |
| UDA1380TT/N2,518 | 功能描述:接口—CODEC SSA CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率: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 |
| UDA1380TT-T | 功能描述:接口—CODEC SSA CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率: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 |
| UDA1384 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multichannel audio coder-decoder |
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