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參數資料
| 型號： | UDA1342 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | Codec |
| 英文描述： | Audio CODEC |
| 中文描述： | 音頻編解碼器 |
| 文件頁數： | 9/44頁 |
| 文件大小： | 180K |
| 代理商： | UDA1342 |
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2000 Mar 29
9
Philips Semiconductors
Preliminary specification
Audio CODEC
UDA1342TS
8.2.2
D
OUBLE DIFFERENTIAL MODE
Since the UDA1342TS is equipped with two stereo ADCs,
these two pairs of stereo ADCs can be used to convert a
single stereo signal to a signal with a higher performance
by using the ADCs in the double differential mode.
This mode and the input signals, being channel 1 or 2 as
input to the double differential configuration, can be
selected via the L3-bus/I
2
C-bus interface.
8.3
Decimation filter (ADC)
The decimation from 64f
s
to 1f
s
is performed in two stages.
x
The first stage realizes a
characteristic with a
decimation factor of 8. The second stage consists of three
half-bandfilters,eachdecimating byafactorof 2. Thefilter
characteristics are shown in Table 2.
Table 2
Decimation filter characteristics
8.4
Digital mixer (ADC)
The two stereo ADC outputs are mixed with gain
coefficients from +24 to
60 dB to be set via the
microcontroller interface.
In front of the mixer there is a DC filter. In order to prevent
clipping, it is needed to filter out the DC component before
mixing or amplifying the signals.
The mixing function can be enabled via the microcontroller
interface.
8.5
Interpolation filter (DAC)
The digital interpolation filter interpolates from 1f
s
to 64f
s
by means of a cascade of FIR filters. The filter
characteristics are shown in Table 3.
Table 3
Interpolation filter characteristics
8.6
Mute
Muting the DAC will result in a cosine roll-off soft mute,
using 32
×
32 = 1024 samples in the normal mode: this
results in 24 ms at f
s
= 44.1 kHz. The cosine roll-off curve
is illustrated in Fig.4.
This cosine roll-off functions are implemented in the DAC
data path before the digital mixer and before the master
mute (see Fig.5).
In the L3-bus and I
2
C-bus mode, the setting of the master
mute can be overruled always by pin QMUTE. This quick
mute uses the same cosine roll-off, but now for only
32 samples: this is 750
μ
s at f
s
= 44.1 kHz.
8.7
Digital mixer (DAC)
TheADCoutputsignaland thedigitalinterfaceinput signal
can be mixed without an external DSP (see Fig.5).
This mixer can be controlled via the microcontroller
interface.
In order to prevent clipping when mixing two 0 dB signals,
the signals are attenuated digitally by
6 dB before mixing.
After mixing the signal is gained by 6 dB after the master
volume. This way clipping at the digital mixer is prevented.
After the 6 dB gain, the signals can clip again, but this
clipping can be removed by decreasing the master
volume.
ITEM
CONDITION
VALUE (dB)
±
0.01
0.2
70
>135
Pass-band ripple
Pass-band droop
Stop band
Dynamic range
0 to 0.45f
s
0.45f
s
>0.55f
s
0 to 0.45f
s
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
x
sin
4
handbook, halfpage
mute
factor
0
10
5
15
25
0
0.8
MGU119
20
0.6
0.4
0.2
t (ms)
Fig.4 Mute as a function of raised cosine roll-off.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UDA1342TS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Audio CODEC |
| UDA1342TS/N1 | 制造商:NXP Semiconductors 功能描述:IC CODEC AUDIO MINIDISC 28-SSOP 制造商:NXP Semiconductors 功能描述:IC, CODEC, AUDIO, MINIDISC, 28-SSOP 制造商:NXP Semiconductors 功能描述:IC, CODEC, AUDIO, MINIDISC, 28-SSOP; Audio CODEC Type:Stereo Codec; No. of ADCs:4; No. of DACs:2; No. of Input Channels:4; No. of Output Channels:2; Audio IC Case Style:SSOP; No. of Pins:28; ADC / DAC Resolution:24bit; ADCs / DACs ;RoHS Compliant: Yes |
| UDA1342TS/N1,512 | 功能描述:接口—CODEC AUDIO CODEC MINIDISC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 |
| UDA1342TS/N1,518 | 功能描述:接口—CODEC MINISOUND 3 RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 |
| UDA1342TSDB | 功能描述:接口—CODEC AUDIO CODEC MINIDISC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數量:2 DAC 數量: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 |
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