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| 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： | 8/68页 |
| 文件大小： | 426K |
| 代理商： | UDA1380TT |
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2004 Apr 22
16
NXP Semiconductors
Product specification
Stereo audio coder-decoder
for MD, CD and MP3
UDA1380
8.6
FSDAC
8.6.1
GENERAL 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 64fs for the 5th-order
noise shaper or 128fs for the 3rd-order noise shaper) of the
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
ANALOG 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 35 mW (at 3.0 V power supply) into a 16
Ω
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 I2C-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, the distance between VREF(HP) and the micro
speaker port must be minimized.
8.8
Digital and analog mixers (DAC)
8.8.1
DIGITAL MIXER
The ADC output signal and digital input signal can be
mixed without external DSP as shown in Fig.10. This mixer
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 I2S-bus output
interface.
handbook, halfpage
MGU531
FSDAC
to analog mixer input
bitstream
Fig.9
Mixing signals to the FSDAC output
(analog domain).
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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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