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| 型號： | UDA1380 |
| 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)： | 16/68頁 |
| 文件大?。?/td> | 278K |
| 代理商： | UDA1380 |
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2002 Sep 16
16
Philips Semiconductors
Product specification
Stereo audio coder-decoder
for MD, CD and MP3
UDA1380
8.6
FSDAC
8.6.1
G
ENERAL INFORMATION
The Filter-Stream Digital-to-Analog Converter (FSDAC) is
a semi-digital reconstruction filter that converts the
1-bit data stream (running at either 64f
s
for the 5th-order
noiseshaperor128f
s
forthe3rd-ordernoiseshaper)ofthe
noise shaper into an analog output voltage. The filter
coefficients are implemented as current sources, and are
summed at virtual ground of the output operational
amplifier. In this way very high signal-to-noise
performance and low clock jitter sensitivity are achieved.
A post-filter is not needed due to the inherent filter function
of the DAC. On-board amplifiers convert the FSDAC
output current to an output voltage signal, capable of
driving a line output. The output voltage of the FSDAC
scales proportionally with the power supply voltage.
Remark:
When the FSDAC is powered-down, the output
of the FSDAC becomes high impedance.
8.6.2
A
NALOG MIXER INPUT
The FSDAC has a mixer input, which makes it possible to
mix an analog signal to the output signal of the FSDAC
itself. In schematic form this is given in Fig.9.
This mixer input can be used for instance for mixing-in a
GSM signal or an FM signal directly to the line output.
In the UDA1380, the mixer input is connected from the
ADC line input via an AVC unit.
Remark
: Before the AVC unit can be used stand-alone,
meaning without the digital part running, first the DAC part
must be initialised in order to have the DAC output
generating zero current. Otherwise the signal will be
clipped.
8.7
Headphone driver
The UDA1380 is equipped with a headphone driver which
can deliver 36 mW (at 3.0 V power supply) into a 16
load.
The headphone driver does not need external
DC decoupling capacitors because it can be DC coupled
with respect to a special headphone output reference
voltage. This saves two external capacitors (which is quite
useful in a portable device).
The headphone driver is equipped with short-circuit
protection on all three operational amplifiers (left, right and
the virtual ground). Each of the operational amplifiers has
a signalling bit which becomes logic 1 in case the limiter is
activated, for instance in case of a short-circuit. This
means the microcontroller in the system can poll the
L3-bus or I
2
C-bus register of the headphone driver and as
soon as, and for as long as, the short-circuit detection bits
are activated, the microcontroller can signal the user that
something is wrong or power-down the headphone driver
(for instance, for energy-saving purposes).
Remark:
To improve headphone channel separation
performance,thedistancebetweenV
REF(HP)
andthemicro
speaker port must be minimized.
8.8
Digital and analog mixers (DAC)
8.8.1
D
IGITAL MIXER
The ADC output signal and digital input signal can be
mixedwithoutexternalDSPasshowninFig.10.Thismixer
can be controlled via the microcontroller interface, and
must only be enabled when the ADC and the DAC are
running at the same frequency. In addition, the mixer
output signal can also be applied to the I
2
S-bus output
interface.
handbook, halfpage
MGU531
FSDAC
to analog mixer input
Fig.9
Mixing signals to the FSDAC output
(analog domain).
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| UDN2878W-2 | 10A SCRS |
| UDZ2.4B | Low Current Operation at 250 ，Low Reverse Leakage,Low Noise Zener Diode |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| UDA1380HN | 制造商:ICS 制造商全稱:ICS 功能描述:Stereo audio coder-decoder for MD, CD and MP3 |
| UDA1380HN/N2 | 制造商:NXP Semiconductors 功能描述:IC CODEC AUDIO MINIDISC 32HVQFN 制造商:NXP Semiconductors 功能描述:IC, CODEC, AUDIO, MINIDISC, 32HVQFN |
| UDA1380HN/N2,118 | 功能描述:接口—CODEC STEREO AUDIO 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 |
| UDA1380HN-T | 功能描述:接口—CODEC STEREO AUDIO CODER-DECODER 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 | 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 |
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