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参数资料
| 型号： | UDA1380TT |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 消费家电 |
| 英文描述： | Stereo audio coder-decoder for MD, CD and MP3 |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO32 |
| 封装： | 6.10 MM, 0.65 MM PITCH, PLASTIC, MO-153, SOT-487-1, TSSOP-32 |
| 文件页数： | 7/68页 |
| 文件大小： | 426K |
| 代理商： | UDA1380TT |
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2004 Apr 22
15
NXP 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 64fs or
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
implemented for both the digital mixer and the master mute
inside the DAC data path, see Section 8.8.
8.4.2
SOUND 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: fc = 1.5 kHz and fc = 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: fc = 250 Hz and fc = 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 128fs) and 5th-order (which runs
at 64fs) via bit SEL_NS in the L3-bus or I2C-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
frequencies well above the audio band. This noise shaping
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)
Pass-band ripple
0 to 0.45fs
±0.025
Stop band
>0.55fs
60
Dynamic range
0 to 0.45fs
>135
handbook, halfpage
010
515
25
1
0
0.8
MGU119
20
0.6
0.4
0.2
t (ms)
mute
factor
Fig.8
Mute as a function of raised cosine roll-off,
displayed assuming 44.1 kHz.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| UDA1380TT/N2,518 | 功能描述:接口—CODEC SSA CODEC RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| UDA1380TT-T | 功能描述:接口—CODEC SSA CODEC RoHS:否 制造商:Texas Instruments 类型: 分辨率: 转换速率:48 kSPs 接口类型:I2C ADC 数量:2 DAC 数量:4 工作电源电压:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-81 封装:Reel |
| UDA1384 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Multichannel audio coder-decoder |
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